Review
Engineering, Environmental
Ning Li, Shuang Wu, Haoxi Dai, Zhanjun Cheng, Wenchao Peng, Beibei Yan, Guanyi Chen, Shaobin Wang, Xiaoguang Duan
Summary: This review provides an overview of different thermal activation modes in persulfate systems (TAP) for on-site decontamination of organic pollutants. The study compares the performances of thermal heating, microwave-induced heating, and photothermal heating in TAP, and discusses the impact of solution pH, background factors, and catalysts on the system. The article concludes with the potential and challenges of TAP systems in water remediation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Biotechnology & Applied Microbiology
Carmen S. D. Rodrigues, Luis M. Madeira
Summary: The study investigated the degradation of p-nitrophenol using activated persulfate oxidation, finding that under optimal conditions, the highest removal rates could be achieved. Persulfate concentration and the presence of iron salt were found to significantly impact process performance.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2021)
Article
Chemistry, Multidisciplinary
Yunxiao Liu, Hongxiu Wei, Ziwei Liu, Xinran Liu, Yijie Fang, Min Jiang, Mingjie Li, Lijuan Zhou, Jianming Zhang
Summary: Cellulose nanocrystals (CNCs) have great potential in various industrial applications, but their green synthesis in an energy-efficient way remains challenging. In this study, a green, energy-saving, and high-efficiency method for extracting CNCs is proposed using NaOH granule-activated ammonium persulfate (APS) oxidation. By utilizing the synergistic effects of APS, NaOH, and cellulose raw materials, the decomposition of APS is promoted, resulting in the release of the crystalline part of cellulose sources. The addition of NaOH solid granules enables efficient utilization of the dissolution heat, reducing energy consumption in the CNC isolation process.
Article
Chemistry, Physical
Dmitri Nikitin, Balpreet Kaur, Sergei Preis, Niina Dulova
Summary: Antibiotics, especially vancomycin, are detected frequently in the environment and contribute to the development of antibiotic-resistant genes in bacteria. Degradation and mineralization of vancomycin were studied using UV photolysis, pulsed corona discharge (PCD), and combinations of these methods with extrinsic oxidants. The combinations showed effective degradation of vancomycin, with higher rates observed in alkaline conditions. Different oxidants had varying oxidation rates, with hydrogen peroxide (HP) being the most efficient in combination with UV photolysis, and peroxymonosulfate (PMS) and peroxydisulfate (PDS) being more efficient in combination with PCD. The combined treatment of PCD and oxidants showed promising results in terms of TOC removal and energy efficiency improvement.
Article
Environmental Sciences
Jiahao Liang, He Liu, Mengyao Zou, Xueqin Tao, Jiangmin Zhou, Zhi Dang, Guining Lu
Summary: In this study, the thermally activated persulfate (TAP) process was used to degrade the most toxic and representative polybrominated diphenyl ethers (PBDEs) in e-waste dismantling sites. The results showed that 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) can be completely degraded under specific conditions, and only one oxidation product of low toxicity was detected. The TAP system exhibited universality for degrading PBDEs and the degradation rate was influenced by the number of substituted bromine atoms.
Article
Environmental Sciences
Xunru Yu, Xiaolei Wang, Changyin Zhu, Fengxiao Zhu, Dongmei Zhou
Summary: Alkaline-thermal coupling activation of persulfate (PS) is an effective method for hexachlorocyclohexane (HCH) degradation. In this study, the strategy of sequential addition of reagents was adopted to explore the effect of temperature and alkalinity on HCH hydrolysis and trichlorobenzene (TCB) oxidation. The results showed that high pH favored HCH hydrolysis but inhibited TCB oxidation. Sequential addition of reagents was found to be more beneficial for the degradation of HCH, especially at low alkalinity. Soils with low soil organic matter (SOM) content exhibited higher degradation efficiency.
JOURNAL OF SOILS AND SEDIMENTS
(2023)
Article
Chemistry, Physical
Sae In Suh, Heesoo Woo, So-Yeon Song, Dongjoo Park, Yong-Yoon Ahn, Eunju Kim, Hongshin Lee, Dong-Wan Kim, Changha Lee, Yong Sik Ok, Jaesang Lee
Summary: In this study, the correlation between the catalytic activity of UK Biochar Research Center biochars (BCs) and their physicochemical properties was explored, and the potential role of endogenous iron in promoting their persulfate activation capability by heat treatment was suggested. It was observed that there was a steady improvement in the persulfate activation efficiency with increasing annealing temperature exclusively for iron-containing BCs (e.g., sewage sludge (SS) BCs). The heat-initiated modification enhanced the electron transfer-mediating capacity and surface affinity toward persulfate, leading to the beneficial effect of annealing on the carbocatalytic activity of iron-containing BCs for non-radical persulfate activation.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Review
Environmental Sciences
Baowei Wang, Yu Wang
Summary: This paper summarizes the research progress of PS activation methods in the field of wastewater treatment, including the advantages, disadvantages, and influencing factors of various physical and chemical activation methods. The possible activation mechanisms are discussed, and future development directions are pointed out.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Dongdong Wen, Xiaopin Guo, Qian Li, Rongbing Fu
Summary: A novel strategy was proposed to enhance the delivery of persulfate into clay by continuously flushing the cathode with persulfate, while using alternating current to thermally activate the persulfate in situ. The results showed significant improvement in mass transfer efficiency and pollutant degradation rate, demonstrating the effectiveness of this cycle strategy in remediating polycyclic aromatic hydrocarbons in clay.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Haijun Li, Yuhang Fu, Changgen Mei, Min Wang
Summary: FeS was selected as a heterogeneous activator of persulfate (PS) for the degradation of a typical recalcitrant contaminant, DR81. Efficient degradation of DR81 was achieved by the FeS/PS system due to the generation of highly reactive SO4• and •OH. The operational parameters had insignificant effects on the decoloration of DR81, while different inorganic anions showed distinct impacts. FeS/PS system exhibited good adaptability and stability in the degradation process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Xi Ni, Qiang Li, Kun Yang, Huiyuan Deng, Dongsheng Xia
Summary: In this study, Congo red (CR) was degraded using different particle sizes of zero-valent copper (ZVC) activated persulfate (PS). The degradation efficiency varied with ZVC particle size, with 50 nm and 500 nm ZVC achieving higher removal rates of CR compared to 15 μm ZVC. The coexistence of certain anions promoted the degradation, while others were detrimental. The smaller the ZVC particle size, the stronger the influence of coexisting anions on the degradation. The degradation pathways and mineralization of CR were identified, and the potential application of 50 nm ZVC in dyeing wastewater treatment was demonstrated with high degradation efficiency even after multiple cycles.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
Enric Brillas
Summary: This review provides a critical and comprehensive analysis of different procedures used to activate potent persulfate-based advanced oxidation processes (AOPs) for efficient abatement of antibiotics. The fundamentals, characteristics, and effects of operating variables of various activation methods are described, along with the generation and identification of radical and non-radical oxidizing agents. The toxicity of treated antibiotic solutions by PS-based AOPs is also discussed.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Environmental Sciences
Carmen M. Dominguez, Arturo Romero, Alicia Checa-Fernandez, Aurora Santos
Summary: The intensive use of organochlorine pesticides and inadequate waste management pose a huge environmental problem. This study addressed the application of different chemical oxidation treatments for the remediation of HCH-polluted soils. Results showed that the combination of hydrogen peroxide and persulfate activated by alkali showed promising results in purifying contaminated soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Shishun Wang, Congwei Luo, Fengxun Tan, Xiaoxiang Cheng, Qiao Ma, Daoji Wu, Peijie Li, Fumiao Zhang, Jun Ma
Summary: The study found that the efficiency of CR removal in the UV/NO3- process was high, mainly due to the role of (OH)• and (NO2)-N• in the degradation of CR. Increasing NO3- dosage can enhance k(obs), but high CR concentrations can decrease k(obs). Accelerating NO3- photolysis under acidic conditions while decelerating CR degradation, and decreasing kobs under alkaline conditions were also observed.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Dajie Zhang, Jiabao Sun, Qiang Li, Haocheng Song, Dongsheng Xia
Summary: The study found that Cu-doped deactivated magnetic loofah biochar can serve as a peroxymonosulfate (PMS) activator to effectively remove tetracycline. The catalyst exhibits high efficiency and stability, and can be used in a wide pH range and in the presence of coexisting anions. The research also provides insight into the possible degradation mechanism and reusing waste biochar catalysts.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Environmental Sciences
Jinchuan Lian, Xiaoxiang Cheng, Xuewu Zhu, Xinsheng Luo, Jingtao Xu, Fengxun Tan, Daoji Wu, Heng Liang
Summary: In this study, ferrate (Fe(VI)) and calcium sulfite (CaSO3) were combined to improve ultrafiltration (UF) performance in surface water treatment. The combination of Fe(VI) and CaSO3 generated various active species, effectively eliminating fluorescent components. Dissolved organic carbon and UV254 were significantly reduced with Fe(VI)/CaSO3 = 0.05/0.15 mM. After UF, the removal rate for these parameters were further improved. The UF stage also resulted in reduced fouling and improved membrane performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Xiaoxiang Cheng, Yongrui Zhang, Qingshui Fan, Lin Wang, Shuai Shi, Xinsheng Luo, Xuewu Zhu, Daoji Wu, Heng Liang
Summary: In this study, a novel Co3O4@carbon nanotubes modified ceramic membrane (Co3O4@CNT-CM) was prepared for simultaneous catalytic peroxymonosulfate (PMS) oxidation and filtration of secondary effluent. The Co3O4@CNT catalyst showed good dispersibility and a large number of active sites, and the Co3O4@CNT-CM had a smooth surface, high permeate flux, and excellent catalytic PMS ability. The Co3O4@CNT-CM demonstrated enhanced antifouling and water purification performance in the treatment of secondary effluent.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xinsheng Luo, Shun Yu, Daliang Xu, Junwen Ding, Xuewu Zhu, Jiajian Xing, Teng Wu, Xiang Zheng, Tejraj M. Aminabhavi, Xiaoxiang Cheng, Heng Liang
Summary: Catalytic membrane based oxidation-filtration processes (AOP-CM) provide an efficient water purification strategy by combining physical separation and chemical oxidation. However, the low efficiency of heterogeneous AOPs in catalytic membranes has hampered the application of AOP-CM. To improve the efficiency, an isoporous AlOx/La2CoMnO6-delta ceramic membrane (IAPCM) with nano-confinement characteristics was prepared. The well-designed pore structure of IAPCM resulted in excellent water permeance and size-exclusion performance. Addition of peroxymonosulfate (PMS) enabled ultrafast degradation of organic micropollutants in the IAPCM system. This work emphasizes the significance of pore structure design for high-performance AOP-CM processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Xiaoxiang Cheng, Cunxian Lai, Xuewu Zhu, Senlin Shao, Jingtao Xu, Fengxia Zhang, Jialin Song, Daoji Wu, Heng Liang, Xinsheng Luo
Summary: A highly permeable nanofiltration (NF) membrane with excellent antifouling properties and selective separation capabilities for drinking water was developed using a low temperature-assisted interfacial polymerization (LTIP) method. The optimized membrane exhibited high water permeance and effective removal of organic matter/minerals, making it suitable for practical water treatment.
Article
Engineering, Chemical
Xiaoxiang Cheng, Yongrui Zhang, Senlin Shao, Cunxian Lai, Daoji Wu, Jingtao Xu, Xinsheng Luo, Daliang Xu, Heng Liang, Xuewu Zhu
Summary: By employing a chitosan interlayer-assisted low-temperature interfacial polymerization and surface grafting polyethyleneimine (CIL-IP-P) strategy, a highly permeable and positively charged nanofiltration (NF) membrane with multilayer structures was successfully prepared. The membrane exhibited improved performance by increasing hydrophilicity through the chitosan interlayer and enhancing electro-positivity and specific surface area through polyethyleneimine grafting, thereby overcoming the trade-off between rejection and permeance in conventional positively charged NF membranes.
Article
Engineering, Chemical
Jinyu Li, Xuewu Zhu, Cunxian Lai, Feiyong Chen, Langming Bai, Xiaoxiang Cheng, Jin Wang, Daoji Wu, Jingtao Xu, Heng Liang
Summary: Highly permeable thin-film composite (TFC) nanofiltration (NF) membranes are crucial for purifying surface water and ground water. This study proposes increasing the filtration area of NF membranes through accurate control of interfacial polymerization (IP) to achieve high separation efficiencies. The triethanolamine (TEOA)-modulated IP method is used to tailor the IP reaction rate and regulate the separation performance of NF membranes.
Article
Engineering, Environmental
Xiaoxiang Cheng, Jinchuan Lian, Bin Liu, Xuewu Zhu, Yan Jin, Lijie Zhang, Fengxun Tan, Daoji Wu, Heng Liang
Summary: To alleviate severe algal-source membrane fouling in the UF process, a combination of calcium sulfite (CaSO3) and ferrate (Fe(VI)) pre-treatment was proposed. The integrated pre-treatment improved the removal rate of algae cells and generated larger flocs with better settleability. The oxidation capacity was strengthened during the Fe(VI)/CaSO3 process, leading to enhanced fouling alleviation and in-situ coagulation efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Xuewu Zhu, Cunxian Lai, Bin Liu, Jun Liu, Daliang Xu, Xiaolong Lu, Daoji Wu, Jingtao Xu, Heng Liang, Xiaoxiang Cheng
Summary: The deep role and mechanism of post-treatment in thin-film composite nanofiltration membranes are investigated in this study. Four solutions of pure water, hexane, Na2CO3, and glycerol were used for post-treatment, and the performances of the resultant membranes were systematically studied. Hexane effectively removed residual acyl chloride groups and prevented the growth of polyamide layers, leading to the formation of smoother and thinner membranes with higher water permeance and excellent salt rejections. Hydrolysis and swelling of unstable polyamide fragments in solutions contributed to greater negative charge, higher hydrophilicity, and enlarged pore size. The resultant membranes exhibited significantly enhanced water permeance and comparable separation behaviors. In addition, the well-constructed membranes possessed superior ion selectivity, antifouling, and stability. The mechanisms of post-treatment on the performance enhancement were proposed from the perspective of interfacial interactions. This facile post-treatment strategy provides new insights into tailoring high-performance nanofiltration membranes for water treatment applications.
Article
Engineering, Chemical
Zhongyue Sun, Xuewu Zhu, Fengxun Tan, Weiwei Zhou, Yongrui Zhang, Xinsheng Luo, Jingtao Xu, Daoji Wu, Heng Liang, Xiaoxiang Cheng
Summary: This study fabricates loose nanofiltration (LNF) membranes with high water permeance and excellent dye/salt selectivity using inexpensive and nontoxic poly(vinyl alcohol) (PVA) as an aqueous monomer. The optimized PVA-based membrane shows outstanding water permeability, favorable dye rejection, and low salt rejection. It also exhibits excellent antifouling properties and long-term stability, making it a promising candidate for industrial-scale LNF membrane production.
Article
Engineering, Environmental
Yan Jin, Minghui Li, Feiyong Chen, Lin Wang, Lijie Zhang, Zhigang Yang, Ning Wang, Jie Fu, Yang Yu, Xiaoxiang Cheng, Daoji Wu
Summary: In urban waters, microplastics form hetero-aggregates through adsorption and accumulation of contaminants. This study reveals that these hetero-aggregates act as a "time bomb" due to their vulnerability to chlorine treatment. The exposure to chlorine leads to the destruction of hetero-aggregates, release of previously adhered organics, and release of intracellular metabolites from lysed cells. This process rapidly increases the concentration of organics but prevents their re-adsorption, resulting in secondary pollution. To mitigate the risks of secondary pollution, the choice of oxidant species and dosage should be optimized based on the characteristics of the existing hetero-aggregates in urban waters containing microplastics.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Haiqing Chang, Naiming Liu, Fangshu Qu, Xiaoxiang Cheng, Zhiwei Zhou, Ying Liang, Ying Yu, Heng Liang
Summary: This study evaluated the alleviation of membrane fouling for the treatment of shale gas produced water (SGPW) using sodium percarbonate oxidation and aluminum sulfate coagulation. The results showed that the combination of oxidation and coagulation effectively reduced turbidity, UV254, and DOC, as well as fluorescent organics in the SGPW samples. The normalized fluxes were significantly improved compared to the raw SGPW, indicating the potential of this combined pretreatment process in controlling membrane fouling.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Xuewu Zhu, Zhongyue Sun, Fengxun Tan, Feiyong Chen, Xinsheng Luo, Feihong Wang, Daoji Wu, Heng Liang, Daliang Xu, Xiaoxiang Cheng
Summary: This study investigates the condensation and hydrolysis reactions of polyester loose nanofiltration (LNF) membranes during alkali activation. The effects of alkaline conditions on membrane characteristics and performance are comprehensively studied. The results show that alkaline conditions affect the rate of interfacial polymerization, with lower alkaline concentrations promoting membrane condensation and higher concentrations causing hydrolysis damage. Molecular simulations provide insights into the mechanisms of these reactions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Environmental Sciences
Xiaoxiang Cheng, Wenxin Song, Fengxun Tan, Xinsheng Luo, Xuewu Zhu, Tao Yang, Zhiwei Zhou, Jingtao Xu, Daoji Wu, Heng Liang
Summary: This study proposes a novel ultrafiltration membrane pretreatment technology using calcium hypochlorite and ferrous iron process for algae-laden water treatment. The results show that the technology significantly reduces membrane fouling, improves water quality, and has great potential in efficiently degrading algal pollutants and enhancing the ultrafiltration capability.
ENVIRONMENTAL RESEARCH
(2024)
Article
Engineering, Chemical
Xiaoxiang Cheng, Jinchuan Lian, Maoju Jiang, Linqian An, Qingshui Fan, Ge Zeng, Peng Su, Wenqi Li, Qixiao Lv, Ying Wu, Jun Ma, Tao Yang
Summary: In this study, iron oxychloride was used to activate peracetic acid for the degradation of emerging organic contaminants. The oxidation mechanism was comprehensively revealed, and the study demonstrated the high application potential of this method in actual water bodies.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Environmental
Xiaoxiang Cheng, Yinuo Liu, Xinsheng Luo, Xuewu Zhu, Jingtao Xu, Xinyu Zhang, Daoji Wu, Feiyong Chen, Heng Liang
Summary: A natural sepiolite dynamic membrane with a three-dimensional network structure was developed to mitigate fouling in PES ultrafiltration membranes. The dynamic membrane exhibited good organic adsorption capacity and prevented the rise in membrane resistance, leading to improved wastewater treatment efficiency. The contaminated layer of the dynamic membrane could be replaced by hydraulic cleaning, resulting in flux recovery.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
