Review
Environmental Sciences
Xiao Wang, Yue Zhang, Zhiwei Wang, Chunhua Xu, Paul G. Tratnyek
Summary: Metal(loid) oxyanions in groundwater, surface water, and wastewater can have harmful effects due to their high toxicity and lack of degradation. Zerovalent iron (ZVI) has been widely studied for the removal of these contaminants, with mechanisms including redox reactions, adsorption, precipitation, and coprecipitation. The corrosion of ZVI leads to the formation of iron oxyhydrides that sequester metal(loid) oxyanions, contributing to their removal from different types of water sources.
Article
Engineering, Environmental
Zenglu Qi, Ruiping Liu, Tista Prasai Joshi, Jianfeng Peng, Jiuhui Qu
Summary: The electrolysis-assisted nano zerovalent iron (E-nZVI) system demonstrated a high removal efficiency of Se(IV), exceeding the non-assisted nZVI system by 135%. Higher voltages did not significantly increase the reaction rate constant, indicating a complex relationship between parameters in the system.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Yanyan Zhang, Pinar Ozcer, Subhasis Ghoshal
Summary: The sulfidation of nanoscale zerovalent iron (S-nZVI) enhances the degradation efficiency of various chlorinated hydrocarbons (CHCs) in groundwater, with the most significant improvement observed for chlorinated ethenes. Under electron limited conditions, S-nZVI enables either higher or comparable maximum degradation quantity for all CHCs investigated, indicating its promise for remediating groundwater contaminated by CHC mixtures. Sulfidation suppresses the generation of partially dechlorinated products and favors degradation pathways leading to non-chlorinated benign products, providing valuable insight for the assessment of S-nZVI applicability and benefits in CHC remediation.
Article
Engineering, Environmental
Peng Fan, Yuankui Sun, Han Lei, Zixin Hu, Wei Wang, Xiaohong Guan
Summary: Mechanochemical ball-milling approach, as a clean and efficient strategy for chemical synthesis, has been developed promisingly for the preparation of functional materials for water treatment. Fe2+-ZVI(bm) synthesized through this approach showed evident superiorities for the removal of Se(VI) and other metal(loid)s, and demonstrated great potential for practical wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Olga Solcova, Pavel Krystynik, Pavel Dytrych, Jakub Bumba, Frantisek Kastanek
Summary: The article discusses simple methods for decontaminating groundwater near brownfields contaminated with organic and inorganic substances. The methods include coagulation-sedimentation, oxidation-reduction, and adsorption. However, potential costs and scalability issues restrict their practical applications.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2022)
Article
Environmental Sciences
Weichun Yang, Qi Li, Yuhong He, Dongdong Xi, Chukwuma Arinzechi, Xiaoming Zhang, Qi Liao, Zhihui Yang, Mengying Si
Summary: In this study, zerovalent iron-loaded hydroxyapatite (ZVI/HAP) was used to simultaneously adsorb Cr(VI), Cu(II), and Co(II) in multi-metal contaminated soil. The co-existing Cu(II), Ni(II), and Co(II) were adsorbed and precipitated onto ZVI/HAP, significantly improving the capture and reduction efficiency of Cr(VI). The application of ZVI/HAP resulted in the reduction of more than 99% of total Cr(VI) and the almost complete adsorption of Cu, Ni, and Co within 20 d.
Article
Environmental Sciences
Jeong-In Hwang, Jang-Eok Kim
Summary: Through various Fenton reaction treatment systems combined with the use of ascorbic acid and hydrogen peroxide, both water and soil contaminated with endosulfan can be effectively remediated. The study showed that the mZVI/AA/H2O2 treatment method was able to remove a significant amount of ED within 24 hours, demonstrating its potential for remediation applications in both water and soil.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Ping Wang, Xiangke Kong, Lisha Ma, Shizhong Wang, Wei Zhang, Le Song, Hui Li, Yanyan Wang, Zhantao Han
Summary: Iron-based materials have high surface reactivity and potential for remediating metal (loid)s in groundwater. However, their limited structural stability and economic feasibility hinder their application in permeable reactive barrier (PRB) technology. In this study, zeolite-supported iron particles (Zeo-Fe) were synthesized through a low-cost physical method, leading to efficient removal of metal (loid)s.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Miroslav Brumovsky, Jana Oborna, Vesna Micic, Ondrej Malina, Josef Kaslik, Daniel Tunega, Miroslav Kolos, Thilo Hofmann, Frantisek Karlicky, Jan Filip
Summary: The article discusses the significant enhancement in reactivity and corrosion resistance of zerovalent iron nanoparticles (nZVI) through nitriding. The study demonstrates the outstanding catalytic performance of iron nitrides (FexN) in various applications and their potential as a tool for trichloroethylene (TCE) dechlorination. The research findings provide valuable insights into the application of nitriding nanoparticles in environmental remediation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
In-Gyu Song, Yu-Gyeong Kang, Jae-Hwan Kim, Hakwon Yoon, Woo Yong Um, Yoon- Seok Chang
Summary: Unprecedented high concentrations of heavy metals have been detected in the groundwater at a zinc smelter in Seokpo, South Korea. The use of sulfidated nanoscale zerovalent iron (S-nZVI) has proved to be effective in removing contaminants and reducing microbial toxicity in the groundwater.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Feilong Gao, Shakeel Ahmad, Jingchun Tang, Chengfang Zhang, Song Li, Chen Yu, Qinglong Liu, Hongwen Sun
Summary: This study successfully synthesized biochar-supported sulfidated nano zerovalent iron (S-nZVI@BC) and demonstrated its effectiveness in the reductive degradation of soil-sorbed contaminants. The as-synthesized composite showed superior nitrobenzene (NB) removal and aniline (AN) formation efficiencies compared to S-nZVI alone. Furthermore, the addition of biochar enhanced the solubilization of NB from soil. Overall, this research highlights the potential of S-nZVI@BC in enhancing the in-situ remediation of NB-contaminated soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Peng Fan, Xiaohong Guan, Guangfeng Wei, Lina Li
Summary: By simply closing the reactor, the electron efficiency and specific removal capacity of ZVI for four metal(loid)s increased significantly, while the removal kinetics was slightly affected. The consumption-redissolution process of DO and corrosion of ZVI were decelerated under closed condition, leading to improved selectivity in metal(loid)s removal.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Environmental Sciences
Wenjing Zong, Liuwei Wang, Xiaoxiang Wang, Xiaoguo Geng, Yufei Lian, Huixia Wang, Renjie Hou, Jing Guo, Xiaodong Yang, Deyi Hou
Summary: Immobilization is a widely used technique for remediating soils contaminated by heavy metals and metalloids. However, the potential mobilization of contaminants over time should be considered. This study investigated the aging characteristics of different oxides and found that the immobilization efficacy varied for different metals. Mg-Al LDHs emerged as the most effective candidate for simultaneous immobilization of As, Cd, and Sb.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biotechnology & Applied Microbiology
Shengqiong Fang, Xiaoyi Huang, Shuangling Xie, Jiale Du, Jianlong Zhu, Kai Wang, Qinglin Zhuang, Xuan Huang
Summary: A novel biochar-loaded nano-zerovalent iron composite (nZVI@CMBC) was developed and applied for the removal of hexavalent chromium in wastewater. The results showed that the nZVI@CMBC composite had a high removal efficiency of Cr(VI) under acidic conditions, with a value of 124.12 mg g(-1).
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Polymer Science
Oanamari Daniela Orbulet, Annette Madelene Dancila, Simona Caprarescu, Cristina Modrogan, Violeta Purcar
Summary: The main objectives of this study were to immobilize nano zerovalent iron (nZVI) onto a polymeric material (Purolite A400) and synthesize the polymeric material (A400-nZVI) using sodium borohydride (NaBH4) reduction. The obtained A400-nZVI was used to remove nitrate ions from simulated groundwater. The polymeric materials, with and without nZVI (A400 and A400-nZVI), were characterized using FTIR, SEM-EDAX, XRD, and TGA analysis. The results confirmed the presence of nZVI on the polymeric material (A400). The adsorption capacity of A400-nZVI as a polymeric adsorbent was evaluated through kinetic and thermodynamic studies. The experimental results showed that nitrate ions reduction followed the pseudo-second-order kinetic model and Freundlich isotherm. A potential reaction mechanism was suggested based on the kinetic model results. A higher nitrate removal (>80%) was achieved under acidic conditions. The results indicate that the obtained A400-nZVI can be considered as a potential polymeric adsorbent for various pollutants in groundwater and wastewater.
Article
Chemistry, Physical
Jing Zhang, Bo Xin, Chao Shan, Weiming Zhang, Dionysios D. Dionysiou, Bingcai Pan
Summary: The study found that increasing the C-O/C = O groups within appropriate range promotes the catalytic activity for ozonation, while the presence of excessive carboxyl groups has a negative impact on activity. Additionally, enhanced ozone adsorption on active sites was confirmed by DFT calculations.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Engineering, Environmental
Yi Ren, Yue Yin, Jingyue Zhang, Lu Lv, Weiming Zhang
Summary: In acidic conditions, the initial catalytic activity of MILs (Fe) was high but decreased rapidly over time, while in weak acid conditions, the decline in catalytic activity was slower and leaching and toxicity were lower. In neutral conditions, MILs (Fe) exhibited good stability but poor initial catalytic activity. Trade-off between catalytic activity and structural stability was observed in MILs (Fe) based Fenton-like processes.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Chenghan Ji, Jingyue Zhang, Ruxue Jia, Weiming Zhang, Lu Lv, Bingcai Pan
Summary: A novel negatively charged poly (sodium 4-styrenesulfonate) (PSS)-modified ZIF-8 adsorbent, ZIF-8@PSS (12 h), was prepared in this study, significantly increasing the adsorption rate and capacity of Ni(II) and quickly reducing Ni(II) levels in wastewater to below safety standards. The introduction of PSS improved particle dispersion, active sites utilization, and Ni(II) diffusion kinetics, leading to enhanced adsorption performance.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Xiaoyang Li, Ruolin Lv, Weiming Zhang, Mingyang Li, Junhe Lu, Yi Ren, Yue Yin, Jiahang Liu
Summary: The application of heterogeneous advanced oxidation processes (AOPs) in wastewater treatment is hindered by low oxidant utilization efficiency, slow catalytic cycling, and matrix interference. This study demonstrates that amorphous zirconium dioxide (aZrO2), a redox-inert metal oxide, can efficiently activate peroxymonosulfate (PMS) to degrade organic micropollutants even under low oxidant doses and complex matrices. The surface Zr(IV)-PMS* complex is identified as the principal reactive species, and the interaction between Zr atom and PMS leads to prolonged O-O bond and elevated oxidation potential for direct reaction with contaminants.
Article
Engineering, Environmental
Xiaoyang Li, Jiahang Liu, Ruolin Lv, Yingying Chu, Lu Lv, Junhe Lu, Weiming Zhang
Summary: In this study, a novel octahedral carbon -encapsulated zirconium oxide catalyst (ZrO2-C) was developed with large specific surface area, highly-dispersed sub-5 nm active sites, and strong metal-support interactions. The catalyst exhibited excellent performance for peroxymonosulfate activation, and a two-step catalytic mechanism was proposed. The study also demonstrated the high selectivity of the catalytic process towards electron-rich compounds, with only those organics with EHOMO values higher than ca.-6.52 eV being oxidized. Overall, this research provides mechanistic insights into the catalytic selectivity of Zr-based catalysts and advances their further application in Fenton-like systems.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Qianlin Huang, Puzhen Zhao, Lu Lv, Weiming Zhang, Bingcai Pan
Summary: In this study, monolithic MnO2-O-v/CF catalysts were fabricated by the in situ growth of CuFePBA over copper foam followed by a redox-etching route. The as-synthesized catalyst displayed superior low-temperature activity and robust durability for toluene elimination. The study provides new insights into the development of highly active monolithic catalysts for the low-temperature oxidation of VOCs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Daowen Wu, Mengyao Sun, Wenbin Zhang, Weiming Zhang
Summary: The surface properties and microstructure of graphene oxide (GO) membranes can be regulated to enhance nanofiltration performance. The surface hydrophilicity and zeta potential of GO membranes can be adjusted by alkaline treatment time, and the presence of tiny defects in GO sheets can increase the number of pores and decrease the length of water nanochannels. These adjustments enable GO membranes to exhibit fast and selective water permeation, demonstrating excellent nanofiltration performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Environmental
Jiahang Liu, Xiaoyang Li, Yingying Chu, Ling Yuan, Ruolin Lv, Weiming Zhang
Summary: The Fe(III)/H2O2 system showed high efficiency in remediation of tetracycline (TC) in water, even faster than the Fe(II)/H2O2 system. TC also initiated the degradation of other refractory pollutants. Complexation between Fe(III) and TC was observed with a stoichiometric ratio of 1:1 and electron transfer from TC to Fe(III) resulted in the production of Fe(II), which served as the initiator of the Fenton reaction. The main reactive species was found to be .center dot OH, facilitating the hydroxylation of TC and the reductive transformation of Fe(III) to Fe(II).
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Ling Yuan, Rongming Xu, Hang Yu, Chenghan Ji, Lu Lv, Weiming Zhang
Summary: This study reports a rare 3D fluorinated pyrazinium-based cationic organic polymer (TBPM-Fpz) that can selectively remove hazardous and radioactive anions from nuclear wastewater at an ultrafast rate. The polymer exhibits fast sorption kinetics, high capacity, and excellent selectivity towards ReO4-. It also shows high removal efficiency in simulated high-level and low activity waste streams.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yi Ren, Weiming Zhang, Longguo Li, Bo Lai
Summary: The integration of catalytic oxidation and ultrafiltration in multifunctional membranes shows promise for enhancing wastewater treatment. Various strategies for further improving these membranes have been developed recently. However, a comprehensive evaluation of multifunctional membranes and their strengthened variants compared to separate oxidation and ultrafiltration units using real industrial wastewater has not been conducted.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Multidisciplinary Sciences
Rongming Xu, Yuan Kang, Weiming Zhang, Bingcai Pan, Xiwang Zhang
Summary: Inspired by biological potassium ion channels, researchers have developed a biomimetic ion channel membrane using MXene nanosheets and EDTA molecules, which achieves efficient separation of ions. This membrane shows high ion permeability and selectivity, making it significant for sustainable water treatment, resource extraction, and energy storage.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Ling Yuan, Mujian Xu, Rongming Xu, Chenghan Ji, Hailun Yang, Hang Yu, Xiaoyang Li, Ming Hua, Lu Lv, Weiming Zhang
Summary: Elucidating the dominant adsorption species of FeCln-n is important for managing waste pickling liquor. Anion resin was found to have high adsorption for both FeCl4- and FeCl3 and FeCl3 was identified as a critical species in the adsorption process. Using FeCl3 instead of FeCl4- can reduce the concentration of hydrochloric acid and promote its reutilization.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Wenbin Zhang, Daowen Wu, Mengyao Sun, Weiming Zhang, Bingcai Pan
Summary: A novel method using intercalated α-zirconium phosphate nano sheets has been proposed to enhance the removal of heavy-metal-organic complexes by graphene oxide membranes. The intercalation process effectively changes the membrane structure and surface potential, resulting in efficient removal of heavy-metal complexes.
ACS ES&T ENGINEERING
(2022)
Article
Environmental Sciences
Wenbin Zhang, Mengyao Sun, Daowen Wu, Weiming Zhang, Bingcai Pan
Summary: In this study, a novel PAN ultrafiltration membrane was fabricated through metal ion Cu2+ cross-linking of the -COO- groups on PAN chains for efficient oily wastewater separation. The Cu2+@HPAN membrane showed improved hydrophilicity, optimized pore structure, and larger zeta potential, leading to highly efficient separation of oily wastewater.
Article
Engineering, Environmental
Yi Ren, Shu Wang, Jing Zhang, Junhe Lu, Chao Shan, Yanyang Zhang, Dionysios D. Dionysiou, Lu Lv, Bingcai Pan, Weiming Zhang
Summary: The multifunctional dual-layer ultrafiltration membrane Seq-ICM showed high efficiency in removing multiple pollutants from wastewater, thanks to its sequential interception and oxidation process. This technology demonstrates promising potential for treating multicomponent substances in wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
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)
