Article
Metallurgy & Metallurgical Engineering
Hong Liu, Yi-min Zhang, Tao Liu, Jing Huang, Li-ming Chen, You-wen Hu
Summary: A process for preparing vanadium electrolyte accompanied by the recovery of valuable elements from vanadium shale was proposed. Under the optimal extraction conditions, a vanadium extraction rate of 99.3% and a vanadium stripping rate of 99.8% were achieved. The study also analyzed the composition and electrochemical performance of the electrolyte, showing that chloride ions in the leaching solution promoted vanadium extraction.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Chemistry, Physical
Rui Cao, Panchun Tang, Xiaobo Yang, Ze Sun
Summary: This paper uses DFT theory to study the binding characteristics of different kinds of extractants and hydrochloric acid molecules, exploring the binding mechanisms and conducting experimental verification.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Chemical
Hong Liu, Yi-Min Zhang, Jing Huang, Tao Liu
Summary: In this study, the coordination mechanism of vanadium in acid leaching solution at low pH was investigated, and it was found that chloride ions can significantly enhance vanadium extraction without entering the organic phase. Additionally, the hydrogen ions of the extractant were observed to enter the aqueous phase more easily, reducing the required pH for the extraction reaction.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
You-Wen Hu, Yi-Min Zhang, Tao Liu, Hong Liu
Summary: This study presents a clean and cost-efficient approach to prepare vanadium electrolytes from vanadium-rich solution of black shale. By introducing saponified D2EHPA, vanadium recovery and impurity separation were improved. A high-purity vanadium electrolyte was achieved through a four-stage countercurrent extraction at low initial pH, as well as a three-stage countercurrent stripping. The developed electrolyte showed excellent electrochemical performance and energy efficiency, with significant cost savings and no harmful emissions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Hong Liu, Yi-min Zhang, Jing Huang, Tao Liu, Yi-ping Wang
Summary: Comprehensive study on the coordination behavior of vanadium ions and extractants is crucial for establishing new efficient extraction systems. This study investigated the synergistic effect and mechanism of D2EHPA and EHEHPA as combined extractants for separating vanadium and impurity ions. The results showed that under the optimal conditions, high purity V2O5 product could be obtained.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
YaMing Li, Min Lin, Mi Tian, Guodong Ye, Xiaotian Zhao
Summary: This study investigated the properties and extraction efficiency of andrographolide in different solvents using computational methods. The results indicated that alcohol solvents may be a good choice for extracting andrographolide.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Yan-Mei Chen, Cong-Zhi Wang, Lei Zhang, Qun-Yan Wu, Jian-Hui Lan, Zhi-Fang Chai, Wei-Qun Shi
Summary: Effective treatment of transuranic neptunium and plutonium from nuclear waste remains a challenge. Neutral extractants containing phosphorus have shown potential for actinides separation. In this study, three phosphorus derivatives were explored for their extraction and separation performances. The results indicated that these phosphorus reagents act as monodentate ligands through the P--O group and have strong complexing ability towards actinide cations. Thermodynamic analysis demonstrated the potential application of these extractants in Np and Pu separation, with the P350 ligand being the most promising.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Environmental
Yutao Zhang, Ruzhen Zhao, Xiaohuan Zhang, Qifeng Wei, Xiulian Ren, Ziwen Ying
Summary: In this study, a novel and cleaner production process was developed to remove impurity anions by precipitation and purify vanadium by solvent extraction using an ionic liquid. The optimized precipitation process effectively removed most of the impurity anions. The vanadium extraction and stripping efficiency reached high levels, resulting in obtaining V2O5 product with a purity of over 99.8%. The extraction mechanism of vanadium (V) with the ionic liquid was investigated in-depth and the essence of the extraction process was explained at the molecular level.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Zhenghao Wang, Zhifeng Qin, Liang Chen, Bin Liang, Yingming Zhu, Kejing Wu, Dongmei Luo
Summary: An environmentally friendly strategy for the direct recovery of low valence vanadium (LVV) from vanadium slag was proposed and investigated. The recovery of LVV was 68.38% in atmospheric leaching and increased to 98.34% in high-temperature self-pressure leaching conditions.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Ziwen Ying, Yue Song, Keyu Zhu, Guixuan Wu, Yun Ju, Qifeng Wei, Xiulian Ren
Summary: A cleaner and sustainable method using amide as extractant was developed to recover vanadium and chromium from leaching solution. The co-extraction of V(V) and Cr(VI) in the chlorinated system achieved high extraction efficiencies, while the subsequent stripping process achieved high recovery efficiencies. The extracted vanadium and chromium could be selectively stripped, resulting in high purity products. The research also provided insights into the extraction mechanism and explored the reduction phenomenon of V(V) and Cr(VI).
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Ziwen Ying, Manxing Huo, Guixuan Wu, Jie Li, Yun Ju, Qifeng Wei, Xiulian Ren
Summary: This study aimed to recover vanadium and chromium from the leaching solution of sodium roasting vanadium slag. EHEHPA was found to be the most suitable extractant for vanadium extraction, with a recovery rate of 99.91%. The study also investigated the effects of different parameters on the vanadium extraction process and the extraction mechanism.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Valfredo Azevedo Lemos, Luana Bastos Santos, Rosivan Santos Assis
Summary: A method based on ultrasound-assisted liquid-phase microextraction was developed for the determination of vanadium in food and environmental water samples. This method follows the principles of green chemistry and uses a deep eutectic solvent for preconcentration.
MICROCHEMICAL JOURNAL
(2022)
Article
Engineering, Chemical
Takafumi Hanada, Kosuke Seo, Wataru Yoshida, Adroit T. N. Fajar, Masahiro Goto
Summary: By utilizing density functional theory calculations, this study investigated novel extractants derived from amino acids to improve the separation of Ni and Co in lithium-ion battery recycling processes. The research demonstrated the effectiveness of the glycine-derived amic-acid extractant for the recovery of Ni and Co, providing insights into the design of extractants for mutual separation of Ni, Co, and Mn in recycling processes. This study highlights the potential of amic-acid extractants for enhancing the efficiency and environmental friendliness of LiB recycling.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Changjie Lu, Weiqiang Tang, Zijiang Dou, Peng Xie, Xiaofei Xu, Shuangliang Zhao
Summary: This study investigated the mechanism of keto-enol tautomerism and isomerization using multiscale reaction density functional theory. The results showed that solvent and water assistance effects reduce the reaction barriers, with water molecule acting as a catalyst by forming a hexagonal ring in the transition state.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Inorganic & Nuclear
Wesley S. Farrell, Gabriela Tejeda, Xavier Solans-Monfort, Egil Sa, Konstantin Bukhryakov
Summary: This study presents ring-opening metathesis polymerization (ROMP) with vanadium(V) alkylidene initiators and analyzes the factors affecting their activity and kinetics. DFT calculations show that non-covalent interactions between ligands and alkylidene significantly impact initiation and propagation rates. Further experiments reveal that metallocyclobutane formation in vanadium-based initiators is different from group 6 analogues. NMR experiments support computational findings and provide insights for future initiator design.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(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)