Article
Biochemistry & Molecular Biology
Hao Kong, Qian Li, Xiangqun Zheng, Peizhen Chen, Gengtao Zhang, Zhiping Huang
Summary: A novel lanthanum-modified-chitosan-attapulgite composite was prepared and characterized for efficient phosphate adsorption in water. The adsorption properties were investigated through kinetics, isotherms, and thermodynamics. The adsorbent showed excellent stability within a pH range of 4-10 and was not significantly influenced by co-existing substances. Chemisorption was the main mechanism for phosphate adsorption. The maximum adsorption capacity of the adsorbent was 102.90 mg/g, higher than other La-based adsorbents. The adsorption process was spontaneous, exothermic, and disordered. The adsorbent exhibited excellent effectiveness in real wastewater.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Materials Science, Paper & Wood
Ahmed H. Orabi, Ahmed E. Abdelhamid, Hend M. Salem, Doaa A. Ismaiel
Summary: The new composite membranes of polysulfone/cellulose acetate incorporated with pre-synthesized chitosan grafted p-phenylenediamine showed efficient uranium adsorption capabilities with good stability and reusability in waste water treatment.
Article
Engineering, Chemical
Jian Chen, Jinbo Ouyang, Weixin Lai, Xiaohong Xing, Limin Zhou, Zhirong Liu, Wenqian Chen, Di Cai
Summary: A novel non-template method was utilized to prepare ultralight composite aerogel globules for the removal of anti-inflammatory drug ketoprofen from aqueous solution. The composite aerogel globules with 10% activated biochar in chitosan exhibited high mechanical property and remarkable sorption performance, with their swelling behavior strongly affected by solution pH. The study also showed decent environment tolerance, complete recovery rate, and excellent reusability of the composite aerogel globules, along with other advantages such as biodegradability, economy, and ease of separation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Mingyue Ma, Zhenxiong Ye, Jie Zhang, Youbin Wang, Shunyan Ning, Xiangbiao Yin, Toyohisa Fujita, Yanliang Chen, Hanyu Wu, Xinpeng Wang
Summary: This study successfully designed and synthesized MnO2@CTS composite aerogel beads for efficient removal of uranium-containing wastewater. These aerogel beads exhibited convenient separation properties, remarkable mechanical strength, and high adsorption performance, highlighting their substantial potential for addressing U(VI) contamination in wastewater.
Article
Chemistry, Multidisciplinary
Ahmed K. Sakr, Mostafa M. Abdel Aal, Khaled A. Abd El-Rahem, Eman M. Allam, Samia M. Abdel Dayem, Emad A. Elshehy, Mohamed Y. Hanfi, Mohammed S. Alqahtani, Mohamed F. Cheira
Summary: A nano-silica/chitosan (SiO2/CS) sorbent was synthesized using a wet process to eliminate uranium(VI) from solution. The sorbent showed promising adsorption capacity for U(VI) and followed second-order sorption kinetics and Langmuir adsorption model. Thermodynamically, the sorption process was spontaneous and exothermic.
Article
Chemistry, Analytical
Zhihui Wang, Yanfei Wang, Chen Yao
Summary: In this study, a new material composed of chitosan (CS) and hexachlorocyclotriphosphazene (HP) was synthesized with polyphosphoric acid as the cross-linking agent to effectively remove uranium(VI) from aqueous solution. The material exhibited high adsorption capacity and efficiency, fitting well with various kinetic and thermodynamic models, with superior reusability. This research demonstrates that CS-HP is a highly efficient and sustainable material for uranium(VI) removal from aqueous solutions.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2021)
Article
Environmental Sciences
Wenjie Liu, Qingliang Wang, Hongqiang Wang, Qi Xin, Wei Hou, Eming Hu, Zhiwu Lei
Summary: A novel chitosan/Chlorella pyrenoidosa composite adsorbent bearing phosphate ligand (CSP/ CP) was designed and synthesized in this study, showing high uranium adsorption capacity and excellent selectivity for uranium. The mechanism analysis revealed that CSP/CP has active sites for high-performance uranium adsorption, and it can be recycled more than five times through desorption with 0.1 M Na2CO3 + 2% H2O2 at 318 K, providing a new scientific basis for the preparation of high selectivity composite adsorbent by chitosan.
Article
Biotechnology & Applied Microbiology
Zimeng Jia, Yunfei Cui, Jian Chu, Qinggang Huang, Jieru Wang, Wei Tian, Xiaolei Wu, Zhi Qin, Jing Bai
Summary: To overcome the separation defect of amidoximated graphene oxide (rGO-PAO) in uranium sorption, a new composite gel sorbent denoted as rGO-PAO/KGM has been successfully synthesized. The sorbents exhibit sponge-like structures and show high uranium sorption capacity. Amidoxime groups play a crucial role in uranium sorption. This study provides potential sorbents for uranium extraction from natural complicated waters.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Chemistry, Applied
Yong Zhang, Bingyu Mei, Binhao Shen, Lingyi Jia, Jun Liao, Wenkun Zhu
Summary: A chitosan-based composite with rich active sites was synthesized by combining biochar, chitosan, and polyethyleneimine. The composite showed excellent adsorption performance for uranium(VI), with a high adsorption efficiency and capacity. It also demonstrated effectiveness in various water environments and met the permissible limits for uranium(VI) removal. Overall, this novel chitosan-based composite has great potential for remediating uranium(VI) contaminated wastewater.
CARBOHYDRATE POLYMERS
(2023)
Article
Engineering, Chemical
Yanlin Liu, Xiaohuan Tang, Limin Zhou, Zhirong Liu, Jinbo Ouyang, Yiming Dai, Zhanggao Le, Adesoji A. Adesina
Summary: In this study, chitosan/graphene oxide (CS/GO) nano-electrodes were fabricated for the efficient electrosorption of U(VI) from uranium-containing effluents. The CS/GO-4 electrode showed the best electrosorption performance for U(VI) due to its well-balanced meso-/micro-porous structure and superior conductivity. The isotherms and kinetics were fitted by Langmuir model. The maximum removal capacity for U(VI) reached 271.2 mg/g at 0.9 V, which was almost double compared to 0.0 V. The electrosorption-desorption cycles further demonstrated the potential application of CS/GO electrode materials for the removal of U(VI) from radioactive wastewater.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Biomaterials
Xue Chen, Guoliang Yan, Ming Chen, Ping Yang, Bolin Xu
Summary: This study developed a composite sponge (ACATS) using alkylated chitosan (AC) and attapulgite (AT) for rapid hemostasis. The ACATS exhibited a hierarchical porous structure with optimal AC N-alkylation of 5.9% and an AC/AT mass ratio of 3:1, and showed good biocompatibility. Compared to the positive control (Celox), ACATS effectively and rapidly stopped uncontrolled bleeding in a rabbit carotid artery injury model, with a shorter time (235 ± 64 s) and less blood loss (8.4 ± 4.0 g).
BIOMATERIALS ADVANCES
(2023)
Article
Chemistry, Multidisciplinary
Saad S. M. Hassan, Ehab M. Abdel Rahman, Gehan M. El-Subruiti, Ayman H. Kamel, Hanan M. Diab
Summary: This study describes the optimal conditions for removing uranium-238, thorium-232, and potassium-40 from wastewater using multiwalled carbon nanotubes (CNTs). The adsorption mechanism is mainly attributed to chemical interactions between the metal ions and surface functional groups of the CNTs. Various parameters such as pH, contact time, initial metal ion concentration, adsorbent dose, and temperature have been studied to understand their effect on the adsorption process. The results show that CNTs have a high efficiency in removing metal ions from wastewater under certain conditions.
Article
Environmental Sciences
Anwen Chen, Wei Liu, Razium Ali Soomro, Yi Wei, Xun Zhu, Ning Qiao, Yueqi Kang, Bin Xu
Summary: A PVA-integrated graphene oxide/attapulgite membrane with high mechanical stability and improved separation performance was developed by reinforcing the structure with PVA and using a pre-treated ceramic substrate. The composite membrane showed high rejection rates for various heavy metal ions and a significantly higher water flux compared to pure graphene oxide membrane.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Khalid Z. Elwakeel, Mohammed F. Hamza, Eric Guibal
Summary: By using activated magnetic chitosan nanoparticles, the sorption of U(VI) at around pH 5 was improved, especially when employing ultrasonic treatment at the highest frequency, indicating enhanced sorption efficiency.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Qi Zhang, Yangyang Wang, Zheng Wang, Zhijie Zhang, Xiaodong Wang, Zhenglong Yang
Summary: The study successfully synthesized the A-BC-NZVI composite and achieved certain results in removing heavy metal uranium from sewage water. The experimental results showed that A-BC-NZVI has significant adsorption and reduction effects on U(VI).
JOURNAL OF ALLOYS AND COMPOUNDS
(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)
