Article
Environmental Sciences
Asha Singh, Dinesh Arora, Renu Bala, Anil Khokhar, Sunil Kumar
Summary: In this study, nanoparticles prepared from aquatic plants Salvinia molesta and Typha latifolia were loaded onto powdered form to create nanocomposite adsorbents for wastewater treatment. The adsorption capacity, optimal working conditions, and mechanisms of the novel adsorbents were evaluated.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Environmental
N. Maniotis, K. Kalaitzidou, E. Asimoulas, K. Simeonidis
Summary: This study presents a continuous flow process for the complete recovery of magnetic nanoadsorbents in drinking water treatment. A rotary separation setup with permanent magnets was used, and magnetostatic analysis and computational fluid dynamics were employed to simulate the magnetic field and flow behavior of the magnetic nanocomposite dispersion. Critical parameters for maximizing capture and separation efficiency were identified, and a pilot unit was developed and tested, achieving total capture and purification of water contaminated with Cr(VI).
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Environmental Sciences
Jianhua Qu, Yang Liu, Jiao Meng, Fuxuan Bi, Shouyi Ma, Guangshan Zhang, Yifan Wang, Yue Tao, Zhao Jiang, Ying Zhang
Summary: In this study, magnetic porous pinecone-derived hydrochar (MPHCMW) co-activated by KHCO3 and K2FeO4 was synthesized for the removal of hexavalent chromium (Cr(VI)) and anthracene (ANT) from water. The synthesized material exhibited a high specific surface area and remarkable microporous structures. The adsorption of Cr(VI) was influenced by the pH of the solution, while the adsorption of ANT was unaffected by the pH. The adsorption processes reached equilibrium within a short period of time and showed high adsorption capacity. The adsorption performance remained stable after multiple cycles.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Zihao Fu, Zijin Hong, Junling Wei, Yukai Liao, Songlin You, Yifan Wang, Jianjing Lv, Huan Feng, Marek Kolencik, Xuexiu Chang, Yu Qian
Summary: This study investigates the sediment phosphorus fractionation, adsorption kinetics, and adsorption isotherm characteristics of two rivers in China, with the aim of exploring management options for maintaining river water quality. The results show that sediment phosphorus fractions and adsorption characteristics are closely related and can be affected by human disturbance. The findings provide useful guidance for protecting the drinking water source reservoir.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Water Resources
Asha Singh, Sunil Kumar, Vishal Panghal
Summary: This study evaluated the adsorption of Cr6+ from aqueous solution using dead biomass of aquatic plants Salvinia molesta and Typha latifolia. Both adsorbents showed good results for Cr6+ removal under certain conditions, and Fourier transform infrared spectroscopy and scanning electron microscopy were used for characterization and analysis.
APPLIED WATER SCIENCE
(2021)
Article
Chemistry, Applied
Naga Dheeraj Kumar Reddy Chukka, P. Gomathi Nagajothi, L. Natrayan, Yeddula Bharath Simha Reddy, Dhinakaran Veeman, Pravin P. Patil, Subash Thanappan
Summary: Groundwater is a crucial natural source of drinking water for millions of people, but fluoride pollution poses a major problem. This study proposes cost-effective and efficient natural treatment approaches that utilize natural adsorbents to lower fluoride levels in groundwater, aiming to prevent dental and skeletal fluoroses.
ADSORPTION SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Chenghong Wang, Anlun Jiang, Xinlei Liu, Kok Yuen Koh, Yi Yang, J. Paul Chen, Kang Li
Summary: Water pollution is a significant environmental issue and addressing the remediation of oxyanion pollutions is crucial. In this study, a water stable metal-organic framework was prepared and demonstrated great efficacy in removing oxyanion pollutants in wastewater. The amorphized framework showed enhanced adsorption capacities and excellent reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Feng Gao, Lei Zhang, Libin Yang, Xuefei Zhou, Yalei Zhang
Summary: Three types of graphene oxides (GOs) were prepared and used for the removal of Cr(VI). The adsorption performance of GOs was affected by initial concentration, pH, adsorbent dosage, contact time, and temperature. The adsorption mechanisms involved redox reaction, electrostatic attraction, pore filling, ion exchange, and complexation. The adsorption processes were mainly monolayer chemisorption and equilibrium could be reached in 30 min. The saturation adsorption capacities of GO-M1, GO-M2, and GO-M3 for Cr(VI) were estimated to be 3.5412 mg.g(-1), 2.3631 mg.g(-1), and 7.0358 mg.g(-1), respectively. The adsorption processes of Cr(VI) by GOs were endothermic, entropy-driven, and thermodynamically spontaneous and feasible. These findings provide important insights into the mechanism and application of Cr(VI) removal by GOs.
Review
Chemistry, Multidisciplinary
Ahmed I. Osman, Eman M. Abd El-Monaem, Ahmed M. Elgarahy, Chukwunonso O. Aniagor, Mohamed Hosny, Mohamed Farghali, Emanne Rashad, Marcel I. Ejimofor, Eduardo A. Lopez-Maldonado, Ikko Ihara, Pow-Seng Yap, David W. Rooney, Abdelazeem S. Eltaweil
Summary: Access to drinkable water is increasingly challenging due to pollution and high cost of traditional water treatment methods. Biological sorbents made from biomass waste offer a promising and sustainable alternative. These sorbents effectively remove contaminants and promote circular economy. Different types of sorbents, preparation methods, adsorption mechanisms, and regeneration processes are discussed in this review.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Md Basit Raza, Siba Prasad Datta, Debasis Golui, Mandira Barman, Tapas Kumar Das, Rabi Narayan Sahoo, Devi Upadhyay, Mohammad Mahmudur Rahman, Biswaranjan Behera, A. Naveenkumar
Summary: To remove arsenic (As) from contaminated soil and water, a novel bentonite-based engineered nano zero-valent iron (nZVI-Bento) material was synthesized. Sorption isotherm and kinetics models were used to understand the mechanisms of As removal. Non-linear regression fitting showed that the pseudo-second-order model was the best fit for the kinetic models, and the Freundlich equation was the best fit for the isotherm models. The nZVI-Bento successfully reduced As in water to below permissible limits for drinking water and stabilized As in soils. The enhanced stability of nZVI-Bento makes it a promising solution for removing As from water for human consumption.
Article
Chemistry, Physical
Huan Zhang, Xin Fan, Xiangyu Liu, Qingdong He, Wenting Zhao, Lei Han, Jingjing Cui, Fang Guo, Wenbo Wang
Summary: A green, low-cost and powerful adsorbent named MCSiMg49 was developed to purify wastewater containing low or high concentrations of lead ions. The adsorbent has a high specific surface area and can completely remove lead ions from natural water, making it ideal for drinking water purification.
APPLIED CLAY SCIENCE
(2023)
Article
Environmental Sciences
Soodamany Periyasamy, Natrayasamy Viswanathan
Summary: Hydrocalumite (HC) is developed as a promising adsorbent for chromium removal, but its powder form limits its practical application. In this study, HC was dispersed in biopolymeric matrices (chitosan and cellulose) to form hybrid bio-composites (HCCS and HCCel) for Cr(VI) removal. Magnetic bio-composites (Fe3O4@HCCS and Fe3O4@HCCel) were prepared for easy separation after adsorption. The synthesized bio-composites showed high adsorption capacity and can be regenerated up to four times with NaOH solution. They are efficient adsorbents for chromium removal.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Sakshi Gupta, Sachin Kumar Ben, Vimlesh Chandra
Summary: A novel hexagonal disc-shaped barium hydrogen phosphate was synthesized and studied for its adsorption capacity towards hexavalent chromium. It displayed effective adsorption in the pH range of 4-5, with sorption being endothermic and spontaneous. The adsorption occurred through electrostatic interaction and followed second order kinetics and Langmuir isotherm model for best fit.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2022)
Article
Biochemistry & Molecular Biology
Laura Cervera-Gabalda, Cristina Gomez-Polo
Summary: In this study, magnetic carbon nanocomposites were successfully used for the removal of Cr (VI). The results showed that the magnetic adsorbents synthesized at high annealing temperature exhibited high magnetization for magnetic separation and large specific surface area for enhanced pollutant adsorption. The adsorption tests confirmed the ability of the synthesized nanostructures to remove Cr (VI), and the materials showed reusability after consecutive adsorption cycles.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Environmental
Zhengde Wu, Chen Zhao, Wengen Zeng, Ximo Wang, Chuanfu Liu, Zhongye Yu, Jian Zhang, Zumin Qiu
Summary: In this study, a novel low-cost and easy-recovery polyethyleneimine functionalized magnetic hydrochar adsorbent was developed, which exhibited excellent adsorption capacity for both CR and Cr(VI) from aqueous solution. Furthermore, the adsorbent showed ultra-high selectivity for CR and Cr(VI) from mixed solutions and had a fast adsorption rate for Cr(VI) ions. The adsorbent also demonstrated superior reusability and fixed-bed column adsorption capacity, making it highly promising for the treatment of wastewater containing CR and Cr(VI).
CHEMICAL ENGINEERING JOURNAL
(2022)
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)