Article
Engineering, Chemical
Lidong Wang, Yilin Li, Jie Liu, Zhixiong Tian, Yun Jing
Summary: A series of self-assembled cobalt-cerium oxides with regulated oxygen vacancies were developed for enhancing low-temperature catalytic oxidation of air pollution, particularly targeting volatile organic pollutant toluene. The introduction of cobalt atoms efficiently tuned the oxygen vacancies in the catalyst, improving oxygen species migration and redox cycles of Co3+/Co2+ and Ce4+/Ce3+. The CoCe-5 catalyst showed significantly enhanced performance, with toluene conversion temperature reduced by 23% compared to ceria, attributed to abundant oxygen vacancies promoting adsorption, activation, and oxidation of toluene.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Pan Xiong, Siqi Fan, Jinshan Song, Qizhou Dai
Summary: The magnetic nanocatalyst Fe3O4@SiO2@CeO2 showed excellent performance in catalytic ozonation of methyldopa, significantly improving the efficiency of ozonation. The enhanced efficiency was attributed to the promotion of ozone decomposition to generate hydroxyl radicals for the degradation of methyldopa.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Environmental Sciences
Hongfei Ren, Zexiang Wang, Xiaoming Chen, Zhenyang Jing, Zhengjun Qu, Lihui Huang
Summary: In this study, cerium-doped lanthanum ferrite perovskite oxides were synthesized and used as ozone catalysts for p-nitrophenol mineralization. La0.8Ce0.2FeO3 showed the highest catalytic activity due to its higher surface area, richer lattice oxygen, surface -OH groups, and facilitated redox cycling of Ce3+/Ce4+ and Fe2+/Fe3+.
Article
Environmental Sciences
Xinghao Liu, Zhaoguang Yang, Wenxiu Zhu, Ying Yang, Haipu Li
Summary: This study established a heterogeneous catalytic ozonation chemical kinetic model, with good correlation between experimentally measured and model-predicted removal ratios, allowing for satisfactory prediction of pollutant degradation rates.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Li Xiang, Fawei Lin, Bohang Cai, Guobo Li, Luyang Zhang, Zhihua Wang, Beibei Yan, Yue Wang, Guanyi Chen
Summary: This paper reports an efficient and low-temperature catalytic ozonation method for the oxidation of dichloromethane, which can eliminate chlorinated alkanes under mild conditions. By controlling the morphology and Cu doping of the catalysts, as well as promoting ozone, the active oxygen system was optimized, leading to excellent catalytic performance.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Applied
N. Inchaurrondo, C. di Luca, G. Zerjav, J. M. Grau, A. Pintar, P. Haure
Summary: The catalytic ozonation of Orange II using sulfuric acid modified aluminosilicate Montanit300 (MS) and hydrochloric acid modified Montanit300 (MH) showed high activity, with MH exhibiting better catalytic performance. The increased activity of MS and M under acidic conditions was attributed to manganese leaching. Additionally, MH displayed greater hydrophobicity, allowing for mild activity even under neutral conditions.
Article
Engineering, Environmental
Chun Cai, Xiaodi Duan, Xianjun Xie, Shuping Kang, Chanjuan Liao, Jiaming Dong, Yangfan Liu, Shaofeng Xiang, Dionysios D. Dionysiou
Summary: This study significantly enhanced the degradation and mineralization of CA using CF/O3 process, mainly through the action of ROS on the catalyst surface. The acute toxicity of the treated solution increased initially and then rapidly declined during the reaction process.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Muhammad Sajid, Muhammad Rizwan Dilshad, Muhammad Saif Ur Rehman, Dehua Liu, Xuebing Zhao
Summary: Furfural production from xylose using p-toluenesulfonic acid as a catalyst in DMSO medium was studied. The optimal catalyst was found to be pTSA-CrCl3 • 6H2O, which achieved a high furfural yield of 53.10% at 120 degrees C. Kinetic modeling showed that the condensation of furfural in the solvent medium could be neglected.
Article
Engineering, Environmental
Huifen Yin, Jing Liu, HanLu Shi, Lei Sun, Xiangjuan Yuan, Dongsheng Xia
Summary: A series of Ag2CO3 doping g-C3N4 composites were synthesized by a precipitation method, and the effects of hydrothermal temperature on their structure and performance were investigated. The decoration of Ag2CO3 provided more active sites, improving the catalytic ozonation performance. The AgCN0.4-10 0 composite showed the best performance and good reusability.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Environmental Sciences
Yujie Fu, Qi Xin, Shuo Zhang, Yang Yang
Summary: A dual-layered catalyst was developed by combining different functional layers to achieve efficient removal of NOx and VOCs over a wide temperature range. The combination of CoCeOx and V2O5/TiO2 layers provided good oxidation ability and acid sites, overcoming the competitive adsorption between NH3 and propane to improve pollutant removal efficiency.
AEROSOL AND AIR QUALITY RESEARCH
(2021)
Article
Chemistry, Organic
Saimei Liu, Yan Li, Feiyi Wang, Chao Ma, Guichun Yang, Jianguo Yang, Jun Ren
Summary: A convenient method for the synthesis of 3-difluoroalkyl phthalides has been developed using PTSA as a catalyst, achieving yields up to 99%. The resulting products can be readily converted into difluoroalkyl phthalide derivatives through simple modifications.
SYNTHESIS-STUTTGART
(2022)
Article
Engineering, Environmental
Jiakai Qiu, Jing Wang, Mingzhu Ren, Xin Yang, Jianbo Zhang, Xiaolong Zhang, Hongbin Cao, Yongbing Xie
Summary: This paper investigated the effect of chloride ion (Cl-) on the degradation of organic compounds. It was found that Cl- affects the degradation by transforming center dot OH to reactive chlorine species (RCS). The competition between organics and Cl- for center dot OH determines their consumption rate, which depends on their concentration and reactivity. The study also showed that Cl center dot had no significant contribution to the degradation of organics, possibly due to its reaction with ozone.
Article
Chemistry, Physical
Serguei Alejandro-Martin, Hector Valdes, Claudio A. Zaror
Summary: Catalytic ozonation using zeolite is an effective method to eliminate VOCs, with experimental evidence suggesting that ozone is adsorbed and decomposed at Lewis acid sites, forming active atomic oxygen that leads to the oxidation of adsorbed toluene at Bronsted acid sites.
Article
Chemistry, Multidisciplinary
Nevin Arikan Olmez, Bilgen Osman
Summary: In this study, a novel solid acid catalyst P(HEMA)-SO3H was prepared and applied in the synthesis of amides via Ritter reaction. The P(HEMA) microspheres were successfully modified with sulfo groups, and the catalyst showed good catalytic activity and reusability.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Chemistry, Physical
Weiyu Wang, Qiang Wang, Jun Xu, Feng Deng
Summary: Parahydrogen-induced polarization (PHIP) is an NMR hyperpolarization technique that enhances NMR sensitivity. This technique generates hyperpolarization through pairwise addition behavior, making it useful for catalyst characterization and understanding reaction mechanisms. This Perspective provides a comprehensive overview of the heterogeneous PHIP (HET-PHIP) technique and its applications in catalytic hydrogenation. The fundamentals of HET-PHIP are introduced, along with its ability to provide information about catalyst morphology and electronic properties. The paper also discusses advancements in mechanistic understanding achieved using HET-PHIP and the limitations and prospects of this technique.
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)