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
Geochemistry & Geophysics
Leibo Bian, Anthony Chappaz, Niels H. Schovsbo, Hamed Sanei
Summary: This study investigated the speciation of vanadium in organic-rich shale and found a new V(+IV)-S structure, suggesting its formation under strongly sulfidic conditions.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Nan-nan Xue, Yi-min Zhang, Tao Liu, Qiushi Zheng
Summary: The study investigated a two-stage pressurized acid leaching coupled with lixivium recycling for the green efficient separation of black shale-hosted vanadium. Results showed that selective leaching of vanadium and synchronous precipitation of Fe and Al as kalunite-jarosite solid solution were achieved under optimized conditions.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Hong Liu, Yi-min Zhang, Peng-cheng Hu, Tao Liu, Jing Huang
Summary: Traditional sulfuric acid leaching fails to achieve comprehensive recovery of valuable elements from black shale, resulting in a leaching residue containing high amounts of silicon and calcium, which is environmentally harmful. A two-stage hydrochloric acid leaching procedure is used to selectively eliminate acid-consuming minerals, achieving leaching percentages of only 0.15% for vanadium and 9.82% for zinc. Subsequent leaching with sodium fluoride and hydrochloric acid degrades mica while leaching vanadium and zinc at percentages of 90.3% and 63.2%, respectively, and leaching only 25.6% of hazardous element iron. Roasting the leaching residue at 750 degrees C for 2 hours yields a silicon-rich residue with a silica purity of 95.5%. This method enables waste-free utilization of black shale.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Physical
Qiushi Zheng, Yimin Zhang, Nannan Xue
Summary: With the increasing demand for vanadium, the extraction technology of vanadium from strategic black shale has been widely valued. The study found that thermal activation can promote the lattice expansion of vanadium-bearing muscovite and enhance the release of vanadium, thereby improving the efficiency of vanadium extraction.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Qiushi Zheng, Yimin Zhang, Nannan Xue
Summary: The study revealed the impact of thermal activation on the lattice of vanadium-bearing muscovite, and analyzed the differences in lattice dissolution and vanadium migration through quantum chemical simulations.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
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)
Review
Engineering, Chemical
Johannes Vind, Kadriann Tamm
Summary: This paper provides a comprehensive overview of the extraction of key metallic values from black shales, covering geological and mineralogical aspects, technological approaches, environmental impacts, and main conclusions.
MINERALS ENGINEERING
(2021)
Article
Engineering, Chemical
Zhe Bai, Yuexin Han, Jianping Jin, Yongsheng Sun, Zhenya Zhou
Summary: A novel two-step fluidized roasting process was explored to enhance vanadium extraction from black shale. The optimal conditions for the two roasting steps were determined. The process significantly increased the vanadium leaching rate and removed carbon, demonstrating its potential for efficient and green vanadium extraction.
Article
Chemistry, Physical
Pengcheng Hu, Yimin Zhang, Qiushi Zheng
Summary: This study investigates the separation mechanism of vanadium from iron impurity during vanadium extraction from black shale using oxalic acid. It reveals that oxalic acid can react with iron impurity, forming a ferrous oxalate passivation layer on pyrite surface, which inhibits the dissolution of pyrite and enhances vanadium purity. Density functional theory calculations show that oxalic acid can reconstruct the surface of pyrite and form a stable passivation layer, reducing the reactivity of iron atoms.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Review
Geochemistry & Geophysics
Mawo Ndiaye, Siim Pajusaar, Merlin Liiv, Sophie Graul, Toivo Kallaste, Rutt Hints
Summary: This study investigates the syngenetic enrichment pathways of V in black shales from the Baltic Palaeobasin, revealing the essential role of the fine mineral fraction in V hyper-enrichment. The results suggest that V is captured via reduced V(IV)-organic complexes adsorbed to fine clay particles, with the specific surface area of clay particles and particle flux to the sea bottom being the primary factors defining the degree of V hyper-enrichment.
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
Green & Sustainable Science & Technology
Wang Li, Chen Ma, Wenhui Gong, Xiaobo Zhu
Summary: A pre-decarburization activated roasting and mild acid leaching process was developed for the recovery of vanadium from shale, with NaCO3 and K2SO4 identified as the most effective additives for promoting the production of water-soluble vanadate. The process resulted in a 92% leaching efficiency of vanadium under mild acid conditions and significantly increased the amount of water-soluble vanadium, reducing acid consumption and impurities. Ultimately, V2O5 with purity of 99.5% was obtained after ion exchange, precipitation, and calcination.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Geology
Viktoriya M. Yarushina, Lawrence Hongliang Wang, David Connolly, Gabor Kocsis, Ingrid Faesto, Stephane Polteau, Assia Lakhlifi
Summary: Gas chimneys, fluid-escape pipes, and diffused gas clouds are common geohazards in petroleum reservoirs and CO2 storage sites. The processes behind the formation of these structures and their role as long-term fluid-migration pathways are poorly understood. Through a multidisciplinary study, including advanced seismic processing techniques and high-resolution simulations, we found that time-dependent rock (de)compaction leads to the formation of high-porosity and high-permeability vertical chimneys that reach the surface. Our simulation results suggest that chimneys in the studied area could have formed and lost their connection to the reservoir within a few months.
Article
Chemistry, Inorganic & Nuclear
Rintu Robert, Vineela Balisetty, Kalapaneni Mohanrao, Minimol Mannamala Pappan, Shilpa Mangalassery, D. Narayana Rao, Kanamaluru Vidyasagar
Summary: Eight isostructural ASb(3)X(2)O(12) (A = K, Rb, Cs, Tl; X = Se, Te) compounds of antimony-(V) were synthesized and structurally characterized by single crystal X-ray diffraction. They have hexagonal-tungsten-oxide (HTO)-related noncentrosymmetric layered structures and showed powder second harmonic generation (SHG) response. TlSb3Te2O12 compound showed significantly high SHG response of 37.2 x KDP.
INORGANIC 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)