Article
Chemistry, Analytical
Karyn N. O. Silva, Karla C. F. Araujo, Djalma R. da Silva, Carlos A. Martinez-Huitle, Elisama dos Santos
Summary: Soil washing is an effective method for removing pollutants from soil by promoting a chemical-physical extraction and separation process. In this study, persulfate solutions were used for washing, which efficiently removed dye from soil without generating highly polluted effluent. The use of persulfate also allowed for electrochemical generation before soil remediation, integrating eco-friendly approaches.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Environmental
Kai Yu, Xiuqiong Yang, Mao Wan, Haowen Jiang, Penghui Shao, Liming Yang, Hui Shi, Xubiao Luo
Summary: This study evaluates a new method for removing soil contaminants using zero-valent iron (ZVI) and low-frequency electromagnetic fields (EMF), and investigates the influence of soil pH on the process. The results show that the method can effectively decrease the residual fraction of contaminants in soil, with the most efficient desorption occurring at a soil pH of 5.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Karyn Nathallye de Oliveira Silva, Manuel Andres Rodrigo, Elisama Vieira dos Santos
Summary: In recent years, electrochemical technologies have been widely utilized for removing contaminants, with boron-doped diamond (BDD) electrodes being considered efficient materials for eliminating persistent organic pollutants in soil-washing effluents. This review summarizes the application of conductive diamond anodes for treating soil-washing effluents contaminated with different organic pollutants and discusses challenges and future research directions of electrochemical technology.
CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE
(2021)
Article
Forestry
Verica Vasic, Timea Hajnal-Jafari, Simonida Djuric, Branislav Kovacevic, Srdjan Stojnic, Sreten Vasic, Vladislava Galovic, Sasa Orlovic
Summary: Clopyralid and imazamox are effective herbicides for weed control in regenerated pedunculate oak forests, but they have a temporary impact on the dehydrogenase enzyme activity of soil microorganisms. However, the dehydrogenase activity can recover to normal levels.
Article
Environmental Sciences
A. S. M. Fazle Bari, Dane Lamb, Geoff R. MacFarlane, Mohammad Mahmudur Rahman
Summary: This study investigated the remediation of arsenic-contaminated abandoned mine soils. Oxalic acid was found to be the most effective washing reagent. Washing reduced the leachability and bioaccessibility of arsenic and iron in the treated soil, but it still exceeded the remediation criteria. Soil washing and subsequent solidification/stabilization could be an alternative option for remediating extremely contaminated abandoned mine soils.
Article
Engineering, Environmental
Deok Hyun Moon, Yoon-Young Chang, Minho Lee, Agamemnon Koutsospyros, Il-Ha Koh, Won Hyun Ji, Jeong-Hun Park
Summary: Soil washing using FeCl3 was effective in reducing heavy metal concentrations, particularly for Pb, with the lowest concentrations achieved with a 1 M FeCl3 washing solution. However, the reduction in Cu and Zn was limited due to their initial concentrations being below regulatory standards. Sequential extraction results showed significant reductions in exchangeable and weak acid-soluble fractions of Pb upon FeCl3 washing.
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
(2021)
Review
Environmental Sciences
Jung Hwan Kim, Hassan Anwer, Yong Soo Kim, Jae-Woo Park
Summary: The study reviewed the washing of radioactive Cs-contaminated concrete and soil with a focus on the parameters of washing solution, clay components in the soil, and aggregates affecting the efficiency and mechanism for Cs decontamination. The research also discussed the importance of different sorption materials for treatment of Cs-contaminated supernatant, categorizing them into clay minerals, metal hexacyanoferrates, ammonium molybdophosphates, hypercrosslinked polymers, supramolecular sorbents, carbon nanotubes, and graphene oxide.
Article
Environmental Sciences
Qasem A. Alhadidi, Zichen Zhou, Katherine Y. Quinones Deliz, Hitomi Yamaguchi Greenslet, Jean-Claude J. Bonzongo
Summary: Recent advances in using zero valent iron (ZVI) as sorbents have shown promising results in removing metals from contaminated soils, especially for borderline and type-B metals with removal efficiency over 90%. The strong covalent bonds between ZVI and metal ions seem to be the driving force behind successful metal recovery.
Article
Environmental Sciences
Peng Zhang, Dongbao Song, Xuejing Xu, Yueli Hao, Xiaofu Shang, Cuiping Wang, Jingchun Tang, Hongwen Sun
Summary: Sulfidation treatment using ball milling technology to prepare micro-sized ZVI particles can effectively activate persulfate (PS) and improve the oxidation performance in both aqueous solution and aged organophosphorus pesticide-contaminated soil.
Article
Chemistry, Multidisciplinary
Joel Britschgi, Wolfgang Kersten, Siegfried R. Waldvogel, Ferdi Schuth
Summary: This study presents a novel electrochemical method for producing methanesulfonic acid, proposes a reaction mechanism, and shows general dependencies between parameters and yields for methanesulfonic acid.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Energy & Fuels
Alfonso Pozio, Francesco Bozza, Nicola Lisi, Francesco Mura
Summary: Nanostructured cobalt oxide anodes for alkaline membrane electrolysis cell were fabricated using electrophoretic deposition on AISI-316 sintered metal fiber substrate, showing improved catalytic activity for oxygen evolution reaction. The EPD method was found to be effective in enhancing the performance of steel anodes in alkaline membrane electrolyzers when compared to other materials such as platinum and cobalt.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Engineering, Chemical
Bo Ye, Tianyun Liang, Zexi Nong, Chaoke Qin, Songwei Lin, Weizhong Lin, Hui Liu, Huankai Li
Summary: This study investigated the feasibility of using alkaline soil washing wastewater as inlet water of microbial electrolysis desalination and chemical-production cell (MEDCC) to desalinate and recover NH3-N. By introducing electrochemically active bacteria into the anode chamber of MEDCC, the desalination and NH3-N recovery efficiencies were improved.
Article
Environmental Sciences
Jean Noel Uwayezu, Zhongfei Ren, Sarah Sonnenschein, Tiina Leiviska, Tore Lejon, Patrick van Hees, Patrik Karlsson, Jurate Kumpiene, Ivan Carabante
Summary: The current study evaluated a three-stage treatment to remediate PFAS-contaminated soil and assessed the possibility of replacing the third stage with an adsorption process. The results showed that the multi-stage treatment is an effective and cost-efficient method to clean up PFAS-contaminated soil.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Chun-Feng Wang, Yue-Yi Li, Ai-Hong Li, Nan Yang, Xiao-Wen Wang, Yin-Ming Li, Ye Zhang
Summary: This study investigated the degradation of chemical oxygen demand (COD) in antibiotic wastewater using hydroxyl-functionalized ball-milled zero-valent iron/Fe3O4 (HFB-ZVI/Fe3O4) material. The application of electric current was found to enhance COD degradation, with a higher current intensity resulting in faster degradation. Neutral conditions were favored for rapid COD degradation, while an increase in current led to a gradual decrease in solution pH. Under optimized conditions, the Electro + HFB-ZVI/Fe3O4 + Oxone system achieved 99% COD degradation. Hydroxyl radicals, sulphate radicals, and other oxidants were found to contribute significantly to COD degradation.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Electrochemistry
Andrey A. Polyakov, Evgeniy S. Gorlanov, Evgeniy A. Mushihin
Summary: Based on existing analytical models and the theory of current and potential distribution, the tertiary current and potential distributions over carbon and non-consumable anodes in cryolite-alumina melt are calculated. The relationship between electrolysis parameters, anode surface geometry, and current and potential distribution is established, and the influence of distribution pattern on anode process stability and anode consumption is discussed. The findings suggest that anode overpotential and diffusion layer thickness are the main factors affecting current and potential distribution, and the uneven distribution across the anode surface can lead to increased anode consumption and destabilization of electrolysis. Possible methods to equalize the distribution are presented.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Review
Environmental Sciences
Puthiya Veetil Nidheesh, Soliu O. Ganiyu, Carlos A. Martinez-Huitle, Emmanuel Mousset, Hugo Olvera-Vargas, Clement Trellu, Minghua Zhou, Mehmet A. Oturan
Summary: The electro-Fenton (EF) process is an effective electrochemical advanced oxidation process for wastewater treatment, but it has limitations for industrial-scale development. Recent research has focused on improving its effectiveness and relevance by modifying operating parameters, electrode material, reactor configuration, and coupling with other treatment methods. This review evaluates the current state of the EF process, presents the latest advances and emerging applications, and discusses the suitability of different modified or hybrid-EF processes based on their performance.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Article
Environmental Sciences
Victor Pertegal, Engracia Lacasa, Pablo Canizares, Manuel A. Rodrigo, Cristina Saez
Summary: The composition and concentration of airborne microorganisms in hospital indoor air exceed recommendations from WHO. Improving air-conditioning designs can help restrict hospital-acquired infections. Different bioaerosol sources significantly influence airborne bacteria concentrations, and ventilation airflow affects bioaerosol distribution.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Ismael F. Mena, Miguel A. Montiel, Cristina Saez, Manuel A. Rodrigo
Summary: In this study, a novel 3D printed casing was designed and manufactured for PEM electro-ozonizers to enhance fluid dynamics and reduce ozone-scavenger interactions during electrolysis. It was found that electrogenerated scavengers, particularly cathodically formed hydrogen peroxide, limit the efficiency of electrochemical ozone production. The effects of current density, electrolyte composition, and operation pressure on efficiency were explored, with higher efficiencies achieved at higher current densities, lower concentrations of non-reacting electrolytes, and lower operation pressures. The 3D printed casing demonstrated excellent performance with ozone productions as high as 0.240 mg/(Ah cm2) and maximum current efficiencies of 5.9% under optimal conditions, showcasing the potential of 3D printing in improving electrochemical processes.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Paulo Jorge Marques Cordeiro-Junior, Marcos Roberto de Vasconcelos Lanza, Manuel Andres Rodrigo Rodrigo
Summary: This study evaluates the electrosynthesis of hydrogen peroxide from the oxygen reduction reaction using a flow-by electrochemical cell under different operation conditions and electrodes. A phenomenological model is proposed to understand the processes inside the electrochemical reactor and the influence of predatory species on H2O2 production at high concentrations. Comparing different anodes, DSA-Cl2 is found to be twice as efficient as BDD, allowing for concentrations as high as 4.2 g L-1. The decomposition of H2O2 is influenced by the electrochemical processes of predatory species such as ozone and peroxymonopersulfate.
CHEMICAL ENGINEERING SCIENCE
(2023)
Article
Electrochemistry
J. Fernandez-Cascan, J. Isidro, J. Guadano, C. Saez, M. A. Rodrigo
Summary: The study evaluates and validates the electrokinetic transport of pollutants from polluted to clean soil at different temperatures using a simple transport model. Real samples contaminated with residues from lindane production are utilized. The results show negligible dragging of aged pollutants, low electro-osmotic fluxes, and insignificant pollutant accumulation in electrolyte wells. However, there is significant volatilization of chlorinated organic compounds (COCs), which accumulate in the mockup walls and pipes. The results align well with a 1-D non-reactive model, and the diffusion coefficients of COCs are independent of chlorine substitutions.
ELECTROCHIMICA ACTA
(2023)
Article
Electrochemistry
Rafael Granados-Fernandez, Miguel A. Montiel, Andrea N. Arias, Carmen M. Fernandez-Marchante, Justo Lobato, Manuel A. Rodrigo
Summary: This study evaluates the performance of a novel integrated electrochemically assisted absorption reactor. The reactor combines a PEM cell and a packed absorption column into a one compartment device to maximize the oxidation of gaseous pollutants. 3D printing technology was used to create the device. The results show that this technology can prevent ozone wastage and achieve high efficiencies in removing benzene, a model VOC. Furthermore, it sheds light on benzene absorption and degradation mechanisms and the effect of current density on process efficiency.
ELECTROCHIMICA ACTA
(2023)
Article
Environmental Sciences
P. Verlicchi, V. Grillini, E. Lacasa, E. Archer, P. Krzeminski, A. I. Gomes, V. J. P. Vilar, M. A. Rodrigo, J. Gabler, L. Schafer
Summary: Organic and microbial contaminants of emerging concern (CECs) are a major concern in reclaimed water reuse projects. This study presents a new methodology for selecting representative CECs and evaluating the performance of a polishing treatment. It includes criteria such as occurrence, persistence, bioaccumulation, and toxicity to rank and select the most representative CECs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Physical
Karla Caroline de Freitas Araujo, Emily Cintia Tossi de Araujo Costa, Danyelle Medeiros de Araujo, Elisama V. Santos, Carlos A. Martinez-Huitle, Pollyana Souza Castro
Summary: In the development of electrochemical sensors, carbon micro-structured or micro-materials have been widely used as supports/modifiers to improve the performance of bare electrodes. However, no attempts for electroanalytical determination of caffeine with CF microelectrode have been reported in the literature. Therefore, a homemade CF-microelectrode was fabricated and used to determine caffeine in soft beverage samples.
Article
Electrochemistry
Herbet L. Oliveira, Thalita M. Barros, Jose E. L. Santos, Amanda D. Gondim, Marco A. Quiroz, Carlos A. Martinez-Huitle, Elisama V. dos Santos
Summary: This study demonstrates, for the first time, the simultaneous production of green hydrogen and carboxylic acids through the electrochemical treatment of washing machine effluent using a solar-powered polymer electrolyte membrane cell. By controlling the operating conditions, the researchers were able to regulate the formation of precursor-intermediates, oxidants, and & BULL;OH production, resulting in the formation of high value-added products and energy sources in the anodic and cathodic compartments. The technology proposed in this study may offer a promising and sustainable route towards achieving the United Nations' Sustainable Development Goals 6 and 7.
ELECTROCHEMISTRY COMMUNICATIONS
(2023)
Article
Electrochemistry
L. G. Vernasqui, N. G. Ferreira, C. Saez, M. A. Rodrigo
Summary: This study compared the production of oxidants in the electrolysis of solutions containing phosphoric acid or phosphate salts using boron-doped ultrananocrystalline diamond (UNC) electrodes and a standard microcrystalline commercial electrode. It was found that high current densities and alkaline pHs favored the production of oxidants. The flat UNC electrode showed the best performance overall, except in low current densities and alkaline pH conditions where the porous UNC electrode outperformed it.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
Maiara B. Ferreira, Elaine Cristina M. de Moura Santos, Jose H. Oliveira Nascimento, Felipe M. Fontes Galvao, Elisama Vieira dos Santos, Jose Eudes Lima Santos, Patricio J. Espinoza-Montero, Carlos A. Martinez-Huitle
Summary: The electrochemical oxidation (EO) technique was investigated for the treatment of textile effluents containing single dye and trichromy. The results showed that Ti/Pt-Sn-Sb anode exhibited better color removal and higher oxidant production compared to Ti/Pt anode, with lower energy consumption.
JOURNAL OF THE MEXICAN CHEMICAL SOCIETY
(2023)
Article
Engineering, Environmental
Gleilson de F. Vieira, Inalmar D. Barbosa Segundo, Jose Eudes L. Santos, Amanda D. Gondim, Elisama V. dos Santos, Carlos A. Martinez-Huitle
Summary: The aim of ensuring water quality and wastewater treatment is emphasized in the sixth sustainable development goal (SDG6) set by the United Nations. Beauty salons (BS), as widely available services, generate effluents with potentially hazardous chemicals that require treatment before being discharged into the sewage system. This study presents a comprehensive characterization of a BS effluent and investigates its electrochemical treatment using boron-doped diamond (BDD) as the anode, stainless steel as the cathode, and NaCl and Na2SO4 as additional supporting electrolytes. The analysis of chemical oxygen demand (COD) removal and energy consumption shows that NaCl is more efficient than Na2SO4 in treating the BS effluent, exhibiting higher COD removal (70% compared to 64% at a current density of 10 mA cm-2), lower turbidity and color in the effluent, and a pH closer to neutral without the need for further correction before discharge. The study also identifies Si-based oxides as the cause of high turbidity in the raw effluent, which can be effectively treated using NaCl as the electrolyte. The proposed treatment method aligns with SDG6 and can serve as an alternative for decision-makers and governments in implementing better water sanitation policies.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Chemical
Aline R. Doria, Angela Moratalla, Caio V. S. Almeida, Ronaldo S. Silva, Katlin I. B. Eguiluz, Giancarlo R. Salazar-Banda, Manuel A. Rodrigo, Cristina Saez
Summary: Developing highly selective anode materials for hypochlorite generation in low-concentrated sodium chloride solutions is challenging. In this study, ruthenium-based binary anodes (Ti/RuO2 -Sb2O4 and Ti/RuO2 -TiO2) were synthesized using different heating methods. The anode characteristics and catalytic activity were found to be influenced by the heating method and chemical composition. The Ti/RuO2 -TiO2 anode prepared by laser heating showed the highest electrocatalytic activity for generating hypochlorite from low-concentrated NaCl solutions. This study provides new insights into the preparation of low-cost materials for efficient disinfectant generation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Alana Maria Nunes de Morais, Danyelle Medeiros Araujo, Inalmar Dantas Barbosa Segundo, Elisama Vieira dos Santos, Suely Souza Leal de Castro, Carlos A. Martinez-Huitle, Janete Jane Fernandes Alves
Summary: This study evaluated the performance of the electrochemical oxidation process in eliminating pesticides from water. The results showed that dimensionally stable anode and boron-doped diamond were effective anode materials for degrading the pesticide acetamiprid. Different current densities were tested, and it was found that higher removal efficiencies were achieved at specific current densities.
APPLIED SCIENCES-BASEL
(2023)
Article
Multidisciplinary Sciences
Inalmar D. Barbosa Segundo, Jussara C. Cardozo, Pollyana Souza Castro, Amanda D. Gondim, Elisama V. dos Santos, Carlos A. Martinez-Huitle
Summary: In order to decentralize monitoring policies and facilitate the work of researchers in developing countries, this study presents a simple and rapid protocol for chemical oxygen demand (COD) analysis using smartphones with a camera. The method is calibrated based on theoretical values and achieves high accuracy for COD measurements. The smartphone protocol has the potential to replace expensive spectrophotometers and contribute to sustainable water sanitation management.
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)
