Article
Materials Science, Multidisciplinary
Miaomiao Peng, Yangjing Tan, Keyu Shen, Zhiyi Hu, Chun Liu, Fei Li, Zhixiong Liu, Wenbin Yan, Jun Hua
Summary: This study investigated the thermodynamics of separating molybdenum(VI) over iron(III) using mixtures of P507 and N235 to enhance separation efficiency. Various parameters affecting the extraction of metal ions were examined. The results showed that the P507+N235 system exhibited excellent separation efficiency.
Article
Engineering, Chemical
Kurniawan, Min-seuk Kim, Kyeong Woo Chung, Rina Kim, Jae-chun Lee
Summary: A new method using mixed extractants of LIX 84-I and TBP was developed for complete separation of copper from nickel in ammoniacal leach solutions of ABS plastic waste. Antagonistic effect of the extractants on depressing nickel extraction facilitated the selective separation of copper. The system showed a potential for sustainable metal separation process through recycling of mixed extractants.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Sam Johnston, Sam Cohen, Cuong K. Nguyen, Khang N. Dinh, Tam D. Nguyen, Sarbjit Giddey, Christopher Munnings, Alexandr N. Simonov, Douglas R. MacFarlane
Summary: Studies have focused on a limited number of catalysts, mainly Pt-based, for the ammonia oxidation reaction (AOR) to synthesize nitrite and nitrate (NO2/3-). However, with the increasing demand for nitrate-based products, exploring alternative catalysts becomes necessary. This study tested 19 metals immobilized on carbon fiber electrodes for their catalytic activity in the ammonia electrooxidation process under alkaline conditions. Nickel-based electrodes showed the highest overall NO2/3- yield, while copper was the only catalyst that enabled the formation of nitrate. Previously unexplored metals, such as iron and silver, also showed promise and provided new insights into the AOR mechanism.
Review
Chemistry, Applied
Robert A. Singer, Sebastien Monfette, David J. Bernhardson, Sergei Tcyrulnikov, Aran K. Hubbell, Eric C. Hansen
Summary: Nonprecious metal catalysts provide cost-effective and sustainable alternatives to expensive transition metals, attracting investment from process chemists across different industries. Iron, cobalt, nickel, copper, and other metals are utilized to catalyze well-studied and novel transformations, as highlighted in industry-relevant literature from November 2020 to February 2021.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2021)
Review
Chemistry, Applied
Robert A. Singer, Sebastien Monfette, David Bernhardson, Sergei Tcyrulnikov, Aran K. Hubbell, Eric C. Hansen
Summary: The article reviews the advancements in the field of nonprecious metal catalysis and highlights the need for further development and application of earth-abundant metals in the pharmaceutical industry.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2022)
Article
Engineering, Chemical
Jun Liu, Baihua Chen, Yunnu Liu, Jun Ma, Xingliang Li, Yanqiu Yang
Summary: The article presents a novel tridentate ligand ETPhenAm with selective extraction properties for americium and curium, demonstrating promising experimental results and potential applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Wensen Liu, Hui Su, Jian Zhang, Lina Wang, Yahui Liu, Jie Liang, Zhaowu Zhu
Summary: The study developed a new synergistic solvent extraction system with excellent selectivity for nickel and cobalt. Using a specific formulation, over 99% of nickel and cobalt can be recovered from a synthetic leaching solution of nickel laterite ore.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Widi Astuti, Fajar Nurjaman, Fika Rofiek Mufakhir, Slamet Sumardi, Dira Avista, Kevin Cleary Wanta, Himawan Tri Bayu Murti Petrus
Summary: An alternative method for recovering nickel and other valuable metals from nickel laterite ores is proposed and evaluated in this study. The method involves a leaching step using citric acid to dissolve nickel and cobalt, and an oxalate precipitation step to precipitate nickel from the leach filtrate. The results showed that nickel and cobalt can be dissolved using 1 M citric acid solution at 80 °C, a pulp density of 100 g/L, and a leaching duration of 5 h. Complete precipitation of nickel can be achieved at 80 °C, 500 rpm stirring speed, and a precipitation duration of 3 h. The method can produce Mixed Oxalate Precipitate (MOP) with a purity of 78%.
MINERALS ENGINEERING
(2023)
Review
Chemistry, Applied
Frederic Buono, Thach Nguyen, Bo Qu, Hao Wu, Nizar Haddad
Summary: This review has summarized recent developments and synthetic applications of nonprecious metal catalysis (NPMC) between July and October 2020, showcasing the growing interest in advancing the catalytic applications of Ni, Cu, and Fe among academic and industrial research laboratories.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2021)
Article
Engineering, Chemical
Long Li, Xiaoyang Hu, Zhuang Wang, Qiao Yu, Fengfeng Li, Fangxiang Luo, Qingjiang Pan, Songdong Ding
Summary: This study investigates the influence of ligand structure on the extraction of Am3+ over Eu3+ in the efficient separation of trivalent actinides over lanthanides. Among the three ligands tested, N,N-diethyl-N',N',N'',N''-tetraoctylnitrilotriacetamide shows the highest extraction ability for Am3+. The study reveals that unsymmetrical NTAamides have higher extraction efficiency to Am3+ and relatively lower selectivity for Am3+ over Eu3+ than the symmetrical NTAamide due to steric hindrance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Materials Science, Multidisciplinary
Artem Sokolov, Dmitry Valeev, Aleksandr Kasikov
Summary: The research focused on the extraction of iron(III) from a chloride solution after bauxite leaching using neutral oxygen-containing extractants and their mixtures, particularly alcohols. It was found that a mixture of 1-octanol and 1-decanol (70%) with 2-undecanone (30%) was effective in extracting iron(III) from hydrochloric bauxite leach liquor. Additionally, a two-step scrubbing process using 7 M HCl was employed to remove impurities co-extracted with iron(III). Ultimately, using a counter-current cascade of extractors, an FeCl3 solution with high iron(III) content and low impurities was obtained.
Article
Engineering, Chemical
Alexandre Silva Guimaraes, Georgio Patricio de Souza Resende, Iranildes Daniel dos Santos, Ysrael Marrero Vera, Marcelo Borges Mansur
Summary: This study evaluated the solvent extraction of Ni, Co, Cu, Ca, Mn, Mg, and Zn using Versatic 10 and its mixtures with various extractants. The results showed that different combinations of extractants have different effects on the separation of metal ions. Versatic 10 + LIX 860 N-IC and LIX 84-I systems preferentially extracted Cu, Ni, and Co, while Versatic 10 + D2EHPA and Versatic 10 + Cyanex 272 were more effective in removing certain impurities.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Chemistry, Multidisciplinary
Xuekai Zhang, Kanggen Zhou, Qingyuan Lei, Yan Xing, Changhong Peng, Wei Chen
Summary: A new approach using NaH2PO4 as the stripping agent was developed for efficient Fe stripping from Fe-loaded Aliquat 336 during rare-earth elements recovery. The strong coordination between Fe3+ and H2PO4- allows for easy stripping of FeH2PO42+ above a certain concentration of H2PO4-. The results showed a maximum Fe stripping efficiency of 95.5% and only a 2% decrease in extraction capacity after 6 cycles, demonstrating the robustness of this approach for Fe stripping and extractant regeneration.
SEPARATION SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Guoping Hu, Yue Wu, Desheng Chen, Yong Wang, Tao Qi, Lina Wang
Summary: Metal ion removal, especially Fe(3+), is crucial for the recovery of nickel and cobalt in the leaching solution of laterite-nickel ores. D2EHPA exhibits high extraction rate and selectivity for Fe(3+), with an extraction efficiency of over 99% under optimized conditions after a three-stage solvent extraction process. Different stripping reagents have varying effects on iron removal, with H(2)C(2)O(4) being the most effective in achieving over 99% iron stripping efficiency under the optimized conditions.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Physical
Syane A. Satyawirawan, Robert W. Cattrall, Spas D. Kolev, Ines G. S. Almeida
Summary: This study investigated the solvent extraction of Co(II) from aqueous solutions using the ionic liquids [P66614][C272] and [P66614][SCN]. The results showed that the cation of the ionic liquids participated in the formation of ion-pairs in the organic phase, maintaining electroneutrality. The Co(II) coordination sphere geometry was tetrahedral, and the stoichiometric mole ratios between the ionic liquids and Co(II) were determined. The extraction of Co(II) was enhanced when the aqueous phase contained an anion with high lipophilicity.
JOURNAL OF MOLECULAR LIQUIDS
(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)