Article
Engineering, Environmental
Banghai Liu, Wanqian Guo, Huazhe Wang, Shanshan Zheng, Qishi Si, Qi Zhao, Haichao Luo, Nanqi Ren
Summary: This study reveals that Co(IV) plays a key role as the dominant intermediate oxidant in the Co(II) and PMS system, with strong oxidation ability, while SO4 center dot- and (OH)-O-center dot also contribute to the degradation process. Moreover, the degradation efficiency of organic substrates is influenced by their ionization potential, and Co(IV) shows resistance to humic acid and background ions compared to radical-based oxidation.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Multidisciplinary Sciences
Qian-Yuan Wu, Zheng-Wei Yang, Zhi-Wei Wang, Wen-Long Wang
Summary: A cobalt-single-atom catalyst with N/O dual coordination was synthesized by O-doping engineering and showed efficient activation of peroxymonosulfate (PMS) for water purification. The O-doped catalyst (Co-OCN) achieved a pollutant degradation kinetic constant 4.9 times higher than that of the catalyst without O-doping (Co-CN) and exhibited a dominant oxidation of pollutants through Co(IV)=O formation. The Co-OCN catalyst on carbon felt achieved continuous and efficient removal of micropollutants.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Engineering, Environmental
Jingjing Jiang, Ziqing Zhao, Jiaying Gao, Tianren Li, Mingyu Li, Dandan Zhou, Shuangshi Dong
Summary: This study successfully generated high-valent cobalt-oxo species (Co(IV)???O) by introducing nitrogen vacancies into graphite carbon nitride. The developed synergistic system showed remarkable selectivity and contaminant removal performance in various aqueous matrices. This provides a novel mechanistic perspective for refractory contaminant treatment through defect engineering.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yanbin Wang, Haibo Shen, Zezhou Shi, Qiushuang Xing, Yunqing Pi
Summary: In this study, a water-soluble sulfonated cobalt (II) phthalocyanine (CoPcS) was used as a molecular catalyst to activate peroxymonosulfate (PMS) and degrade organic contaminants. The system was dominated by high-valent cobalt-oxo species (Co(IV)) rather than the conventional sulfate radicals (SO4 center dot) and hydroxyl radical (center dot OH). Nonradical oxidation was predominant in acidic conditions, while radical oxidation pathway occurred in neutral or alkaline conditions. The CoPcS/PMS system showed high selectivity towards organic pollutants with low ionization potential (IP) and was resistant to inorganic anions and dissolved organic matter.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Jian Wei, Zhaokun Xiong, Mengmeng Ao, Zhuang Guo, Jiali Zhang, Bo Lai, Yonghui Song
Summary: In this study, an N-doped graphite catalyst (Fe-NC-4) was developed to activate PMS for the degradation of sulfamethoxazole (SMX). The Fe-NC-4 catalyst showed superior capacity in PMS activation and exhibited satisfactory stability in natural water, making it an effective catalyst for efficiently degrading aqueous contaminants.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Qiunan Sun, Xuejiang Wang, Yiyang Liu, Yanan Zhang, Siqing Xia, Jianfu Zhao
Summary: In this study, carbon nitride incorporating copper ferrite catalyst (CNCFEp) was synthesized and applied for the degradation of antibiotics in water. The catalyst showed excellent degradation efficiency under visible light irradiation and neutral conditions. The study also identified the major reactive oxygen species (ROS) responsible for the degradation, as well as the degradation pathways of the antibiotics. This work provides a novel catalytic system for the removal of organic contaminants and bacteria in environmental waters.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Hanxuan Zeng, Xiao Ling, Hao Zhu, Jing Deng, Xiaoyan Ma, Haojie Zhang, Lin Deng, Zhou Shi, Xueyan Li
Summary: This study reveals that the spongy Co3O4 driven PMS activation is a mixed radical/nonradical process with the important role of sulfate radical (SO4·). Spongy Co3O4 not only exhibits stronger catalytic ability and better stability compared to commercial Co3O4, but also works under near neutral conditions and shows little suppression from widely existing anions. This research provides a reliable oxidation technology for the removal of organic pollutants and sheds new light on the cobalt oxide triggered PMS activation process.
Article
Chemistry, Physical
Xiaoyue Zhou, Renli Yin, Jieqiong Kang, Zhenjie Li, Yanan Pan, Jieyun Bai, Adela Jing Li, Rongliang Qiu
Summary: This study designed iron-vacancy anchored layered double hydroxides to activate Peroxymonosulfate (PMS) and improve the removal rate of sulfamethoxazole (SMX) by 30 times compared to PMS alone. The cooperation of Fe vacancies and PMS led to the spontaneous generation of high-valent iron-oxo species, resulting in the enhancement of PMS activation pathways. This research provides a new perspective on the generation of high-valent iron-oxo species for the effective treatment of wastewater.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Sheng Xiong, Hao Zeng, Rongdi Tang, Ling Li, Zhanpeng Zhou, Wenbo Li, Daoxin Gong, Yaocheng Deng
Summary: In this study, the Fe-based catalyst FeBCBa was used to efficiently remove atrazine under ultrasonic treatment. The piezoelectricity of barium titanate enhanced the production of Fe(IV) and resulted in superior performance of the catalyst. This study provides new guidance for constructing stable and efficient catalysts for environmental remediation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Shijing Li, Xiangyong Zheng, Huachang Jin, Linbo Qian, Kun Wang, Yi Shen, Min Zhao, Renlan Liu
Summary: Peroxymonosulfate (PMS)-based advanced oxidation technologies, with cobalt as a powerful activator, have shown great potential in environmental pollution control. In this study, a graphene-based catalyst with a three-dimensional macrostructure containing Co(II) and Co(III) was created through simple freeze-drying and high-temperature calcination. The multivalent cobalt improved the reaction rate of material activation PMS to degrade SMX, and the presence of sp2-hybridized carbon lattice accelerated the electron-transfer rate. The study contributes to the investigation of the PMS reaction mechanism of multivalent cobalt-doped graphene catalytic materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yang Zong, Hua Zhang, Xiaomeng Zhang, Wen Liu, Longqian Xu, Deli Wu
Summary: The overlooked role of high-valent cobalt-oxo species (Co(IV)) in the Co(II)/peroxymonosulfate (PMS) process has been revealed recently, showing that Co(IV) can trigger hydroxyl radical (center dot OH) formation and heavily influence the distribution of oxidized products of PMSO. The oxidative contribution of Co(IV) and center dot OH on organic degradation is specifically dependent on the type and concentration of the substrate. This study provides deeper insights into the evolution pathway of center dot OH mediated by Co(IV) species and enriches understandings on the collaborative oxidation mechanism in Co(IV)-involved processes.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Xiujuan Zhang, Xiaobiao Zhu, Hao Li, Caihan Wang, Tingting Zhang
Summary: This study reveals the important roles of high-valent iron species in the degradation of sulfamethoxazole by the Fe(VI)/PMS system. It also shows that PMS promotes the production of high-valent iron species. These findings may contribute to the regulation and application of Fe(VI)/PMS systems in water/wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Zhiwei Wang, Wenlong Wang, Jin Wang, Yi Yuan, Qianyuan Wu, Hongying Hu
Summary: In this study, Fe singly anchored onto graphite carbon nitride was synthesized and its superior oxidation performance in peroxymonosulfate activation and organic pollutant oxidation was demonstrated. The mechanism and superiority of the FeN6=O mediated oxidation pathway were elucidated. This research can advance the application of this new approach in advanced oxidation processes.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Sheng Xiong, Hao Zeng, Rongdi Tang, Ling Li, Zhanpeng Zhou, Jiajia Wang, Chunxia Ding, Daoxin Gong, Yaocheng Deng
Summary: Co-based catalysts, especially high-valent cobalt oxo species (Co(IV)), have shown great potential in advanced oxidation processes. This study presents a novel method for enhancing electron transfer in Co-based catalyst/PMS systems by using Enteromorpha-derived biochar modified with cobalt and barium titanate. The resulting CoBCBa catalyst exhibited excellent performance in atrazine removal, attributed to the synergistic effect of Co(IV) and BaTiO3 piezoelectricity. The research also provides guidance for constructing piezoelectricity-assisted high-valent cobalt oxo species for environmental remediation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Ta Cong Khiem, Nguyen Nhat Huy, Eilhann Kwon, Stanislaw Waclawek, Afshin Ebrahimi, Wen-Da Oh, Suresh Ghotekar, Yiu Fai Tsang, Wei-Hsin Chen, Kun-Yi Andrew Lin
Summary: A yolk-shell-structured nanosphere, Co3O4 with tailored oxygen vacancies, enables single-electron transfer and generates high-valent cobalt-oxo species for the fastest phenol degradation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)