SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiachang Shen,Maohua Yang,Jianmin Xing
Utilization of an in vitro multi-enzyme catalytic system for the synthesis of fructose from carbon dioxide is a promising approach towards achieving carbon neutrality. However, the lack of effective separation methods for the buffer HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) and the product fructose within the system has hindered the industrialization of in vitro multi-enzyme catalytic synthesis systems. This study aimed to separate and recover HEPES and fructose using nanofiltration technology. We investigated the influence of various parameters, including total solution concentration, solute concentration ratio, pH, and temperature, on the nanofiltration separation performance. Experimental results revealed that increasing the pH to 9.0 significantly decreased the fructose retention rate while maintaining a nearly complete HEPES retention rate. The HEPES-fructose mixed solution was further subjected to diafiltration using a spiral-wound membrane, ultimately yielding fructose and HEPES solutions with purities of 90.22 % and 92.93 %, respectively. Combining separation test results with models such as DSPM-DE, and using characterization methods such as ATR-FTIR and pore size distribution analysis, we observed pore swelling during nanofiltration of the HEPES-fructose solution at pH 9.0. A mechanism for this pore swelling, induced by the dissociation of HEPES under the influence of pH, was proposed: Dissociated HEPES in the solution interacts with the membrane surface at the liquid-membrane interface, causing reversible swelling of the membrane pores at the membrane surface, thereby reducing the retention rate of fructose. The nanofiltration process developed in this study effectively separates HEPES and fructose, enabling resource recycling and cost reduction. Furthermore, this study provides theoretical foundations and practical guidance for the design of nanofiltration separation strategies for similar systems using HEPES as a buffer, holding significant scientific and practical value.
研究领域:
生物工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junfeng Kong,Huazhen Cao,Wenhua Xu,Weilun Qian,Lining Yu,Anyang Tang,Zhengzheng Liu,Huibin Zhang,Guoqu Zheng
The depth-separation of arsenic from antimony is crucial for achieving high-purity antimony metal. Chlorinated distillation has shown to effectively lower arsenic levels to just a few ppm, making it a promising method for arsenic impurity removal. However, many aspects of the deep separation mechanism of arsenic remain unexplored, posing technical barriers to effective arsenic removal in high-purity antimony production. This work introduces a “chlorine/oxygen affinity selective distillation” model to elucidate the mechanism underlying arsenic and antimony separation in chloride systems. Through thermodynamic analysis and quantum chemistry calculation, we demonstrate that arsenic species in different oxidation states exhibit markedly distinct affinities for chlorine and oxygen. The critical factor is the change in the solvation structure of As 3+ as it interacts with Cl − , while the strong binding affinity between As 5+ and oxygen inhibits chloride-mediated desolvation. Thus, HCl concentration plays a pivotal role in enhancing the separation efficiency of As 3+ from Sb 3+ . Experimental results reveal that increasing HCl concentration from 5 mol/L to 7 mol/L boosts arsenic removal efficiency by 5.7 %. This mechanism may offer broader applications for the efficient separation of similar elements in chloride systems.
研究领域:
冶金学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 22
·7210-7218
·
IF 4.029
Wenhui Liu,Qi Wang,Yan Zheng,Shubin Wang,Yan Yan,Yanzhao Yang
In this study, a method of one-step separation and recycling of high purity Pd(II) and Pt(IV) using an ionic liquid, 1-butyl-3-benzimidazolium bromate ([HBBIm]Br), was investigated. The effects of [HBBIm]Br concentration, initial metal concentration, and loading capacity of [HBBIm]Br were examined in detail. It was observed that [HBBIm]Br was a very effective extractant for selectively extracting Pd(II) and precipitating Pt(IV). Through selectively extracting Pd(II) and precipitating Pt(IV), each metal with high purity was separately obtained from mixed Pd(II) and Pt(IV) multi-metal solution. The method of one-step separation of Pd(II) and Pt(IV) is simple and convenient. The anion exchange mechanism between [HBBIm]Br and Pt(IV) was proven through Job's method and FTIR and 1H NMR spectroscopies. The coordination mechanism between [HBBIm]Br and Pd(II) was demonstrated via single X-ray diffraction and was found to be robust and distinct, as supported by the ab initio quantum-chemical studies. The crystals of the [PdBr2 ·2BBIm] complex were formed first. Moreover, the influence of the concentrations of hydrochloric acid, sodium chloride, and sodium nitrate on the precipitation of Pt(IV) and extraction of Pd(II) was studied herein. It was found that only the concentration of H+ could inhibit the separation of Pt(IV) because H+ could attract the anion PtCl62−; thus, the exchange (anion exchange mechanism) between the anions PtCl62− and Br− was prevented. However, both the concentration of H+ and Cl− can obviously inhibit the extraction of Pd(II) because H+ and Cl− are the reaction products and increasing their concentration can inhibit the progress of the reaction (coordination mechanism).
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 6
·2691-2696
·
IF 1.5
Wang Yi,Yang Jiajia,Sui Jixue,Wang Lan,Tang Jia,Yang Yu,Lu Yunyun,Dai Shuang,Cao Qi
Efficient separation of europium (Eu) from aqueous solution is pivotal for the sustainable development of nuclear industry and rare earth industry. In this work, bis(2-ethylhexyl) phosphate (P204) was employed to separate Eu(III) by solvent extraction method using kerosene as diluent. The extraction equilibrium could reach within 30-min contact time. The extraction ratio enhanced as the increased O:A phase ratio, extractant concentration, and temperature. However, the HCl introduction caused its clear descent. Combined with the slope method and FT-IR analysis, extraction mechanism could be unveiled, which is the coordination between P=O double bond and Eu(III) ions in a proportion of 3:1.
研究领域:
化学工程
·
核工业
·
稀土工业
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2023
·Vol. 75
·期 2
·268-278
·
IF 2.6
Li Yan-Chun,Zhao Fei-Ping,Liu Hui,Peng Bing,Min Xiao-Bo,Lin Zhang
It is critical to recycle valuable elements such as zinc and iron from smelting waste containing zinc ferrite because of the resource crisis and environmental sustainability. Sulfating roasting followed by water leaching has been considered a promising approach. In this study, a novel sulfating roasting method using SO 2 has been developed to treat zinc ferrite for the efficient separation of zinc and iron. Moreover, the conversion mechanism of zinc ferrite and SO 2 was investigated in detail. The results showed that the transformation rate of zinc ferrite reached 95.47% at 600°C for 30 min under SO 2 /SO 2 + O 2 of 60% (v/v). The mechanism studies revealed that O in SO 2 combined with the O vacancy of \( {\text{Zn}}_{{{\text{A}} - {\text{site}}}}^{{2 + }} - {\text{O}} - {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) , while the S in SO 2 combined with the \( {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) of \( {\text{Zn}}_{{{\text{A}} - {\text{site}}}}^{{2 + }} - {\text{O}} - {\text{Fe}}_{{{\text{B}} - {\text{site}}}}^{{3 + }} \) for electron migration. S (IV) was oxidized to S (VI) while Fe 3+ was reduced to Fe 2+ . Importantly, zinc ferrite transformed into zinc-deficient magnetite intermediate ( \( {\text{Zn}}^{{2 + }} ({\text{Fe}}^{{2 + }} )_{{{\text{A}} - {\text{site}}}} - {\text{O}} - {\text{Fe}}^{{3 + }} ({\text{Fe}}^{{2 + }} )_{{{\text{B}} - {\text{site}}}} \) ) via reduction of Fe 3+ and migration of Fe 2+ . The transformation of zinc ferrite was a catalyst-free redox reaction. This study provided a new insight into the utilization of smelting waste and a theoretical basis for the efficient separation of zinc and iron from smelting waste containing zinc ferrite.
研究领域:
冶金工程
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wei Qi,Junhui He,Mengjie Li,Maolin Zhai,Long Zhao
Rhenium has important applications in metallurgy, military, aviation, chemical, and petrochemical industries and related fields. Because the average concentration of rhenium in the Earth’s crust is just one part per billion (ppb), it is necessary to research the separation and extraction of rhenium from its associated minerals or related solutions. In this study, rhenium extraction through demulsification of an alkyl imidazolium ionic liquid-based microemulsion was explored. Alkyl chain length, components of microemulsion, temperature, acid concentration, and competitive ions affecting rhenium extraction were thoroughly considered. The components of the microemulsion had a significant effect on the extraction process. Extraction efficiency improved with the increase in the alkyl chain length, but it decreased with the rising concentration of nitric acid. The concentration of alkyl imidazole cations in the continuous phase had obvious effects on extraction efficiency. Thermodynamic studies showed the process was endothermic and spontaneous. The extraction mechanisms were an anion exchange and electrostatic attraction between the two N atoms of the imidazole ring and water (H 2 O) or perthenate (ReO 4 − ) forming the complex ([Omim]ReO 4 )•(HReO 4 ). Thus, the extraction efficiency of the microemulsion system was about 1.6 times greater than that of the performance of ionic liquids alone. A microemulsion system can be damaged by a strong electrostatic repulsion and steric hindrance effect between the adjacent imidazole rings on the interface of the microemulsion droplet after rhenium extraction. The extraction system is a potential application for the selective separation and extraction of rhenium from simulated radionuclide liquid waste through adjustments to the acidity concentration. Findings of this study provide some basic data regarding the technology for separating and extracting rhenium in future.
研究领域:
冶金学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Chen Li,Chuncai Zhou,David French,Ian T. Graham,Zixuan Wang,Yunfei Li,Feng Wang,Guijian Liu
As strategic emerging industries represented by clean energy technologies develop rapidly, gallium (Ga), one of the critical elements due to its use in these technologies and limited supply, has attracted worldwide attention. The discovery of appropriate materials to adsorb Ga is crucial for improving the utilization of Ga resources. With the goal to recover Ga ions more efficiently and selectively, carbon nanotubes (CNTs) and amino-functionalized MIL-53 series metal–organic skeletons were hydrothermally synthesized into CNT/NH2-MIL-53(Fe) composite adsorbents. The composite's morphology, structure, chemistry and other physicochemical features were characterized, and the adsorption conditions including pH, initial Ga concentration, along with adsorbent dosage were optimized. The outcomes suggest that 2-CNT/NH2-MIL-53(Fe) performs better than the unmodified material in adsorption, and the theoretical maximum adsorption amount of Ga is 1483.8 mg g−1. The adsorption exhibited a single layer chemisorption with an endothermic spontaneous reaction. The adsorption mechanism for Ga onto 2-CNT/NH2-MIL-53(Fe) was mainly via ion exchange and chelation, accompanied by hydrogen bond interaction. The outstanding adsorption capacity and reproducibility using CNT/NH2-MIL-53(Fe) composites provide a novel method for adsorbing Ga from aqueous solutions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Chaochi Huang,Jinhe Sun,Ciming Wang,Qian Zhang,Mingyong Wang,Pengrui Zhang,Zixuan Xue,Yan Jing,Yongzhong Jia,Fei Shao
Lithium isotopes (6Li and 7Li) play an important role in the nuclear industry. The development of green and efficient separation methods is a top priority for the lithium isotope industry. In this work, an “aqueous solution|ionic liquid–crown ether organic solution|aqueous solution” system was constructed and used for lithium isotope electromigration separation. The influence and synergy of Li+ diffusion, electromigration, and chelation of crown ether on Li+ migration and isotope separation were investigated, discussed, and verified carefully. The separating laws were summarized. The process and mechanisms of lithium isotope separation were explored preliminarily. The presence of crown ether in organic solution and the introduction of electric field can change the migration ratio and lithium isotope enrichment effect of different parts in the system. The synergy of Li+ diffusion, electromigration, and chelation of crown ether can change the behaviors of Li+ migration and isotope separation significantly. What’s more important, the driving forces are not constant but dynamic. The diffusion increased with the increasing concentration gradient among different parts. The chelation decreased with the increasing Li+ concentration in organic solution. The electromigration also changed with the varied chemical speciation of Li+. The results helped in understanding the roles of driving forces more clearly and provided a foundation for developing green and efficient methods for lithium isotope separation.
研究领域:
化学
·
核工业
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yang Li,Feifei Yang,Jing Xiong,Kejia Liu,Wanhai Xiao,Tao Qi,Zhipeng Dong,Yong Wang
Rare earth polishing powder waste (REPPW) usually contains lanthanum (La) and cerium (Ce) with content over 50 %, thus its recovery is important for the cyclic utilization of rare earth. In the traditional acid leaching process, La and Ce are simultaneously leached and required further separation. Based on their leaching behavior difference, a two-stage hydrochloric acid leaching process was proposed in this study to recover and primarily separate La and Ce in REPPW. With the optimal operation conditions, La enriched solution with a relative purity of 91.11 % and Ce enriched solution with a relative purity of 92.85 % were obtained and their recovery ratio were 59.47 and 85.15 %, respectively. After precipitation and calcination, products of La 2 O 3 with purity of 83.67 % and CeO 2 with purity of 93.38 % were obtained. Besides, individual leaching kinetics of La and Ce in low-acid leaching were studied using various shrinking core models. Based on the analysis of phase components and micromorphology evolution of REPPW during the leaching process, the leaching mechanism of REPPW was determined. Combined the leaching regularity with the fitting results, the leaching process of La was controlled by interfacial transfer and product layer diffusion, and the Ce was by product layer diffusion. The apparent activation energies of the LaOF and CeO 2 leaching reactions were 89.97 kJ/mol and 79.03 kJ/mol, respectively.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2024
·Vol. 10
·期 4
·2630-2645
·
IF 2.5
Wu Zi-wang,Wang Lai-xin,Li Jing-wei,Lin Yin-he,Wang Da-long,Zhang Lin,Fan Yu-hang,Tang Wen-ming,Chen Hong-sheng
Vanadium titanomagnetite (VTM) is a complex polymetallic symbiotic mineral dominated by iron, titanium, and vanadium. Iron extraction from VTM is an issue for the utilization of Vanadium titanomagnetite concentrate. In this work, flotation method combined with magnetic sorting was proposed to separate and recover the iron resources from VTM. The reverse cationic flotation of iron ore in VTM was carried out with polyetheramine (PEA, molecular weight of 2000) as collector, and the differences of iron grade and recovery in VTM with different particle sizes were studied. The magnetic separation result shows that the iron grade of the magnetic part is 28.38% with the particle size 100–74 μm, which is 10% higher than the iron grade of the raw ore. The flotation results of magnetic separation products show that PEA-2000 can effectively separate and recover iron from VTM. The iron grade of the magnetic part is increased to 47.27% after flotation process at particle size 100–74 μm, pulp pH 4, PEA-2000 concentration 1 × 10 −4 mol/L, and pulp concentration 10 g/L. The mechanism of flotation separation of Fe from VTM by PEA-2000 was analyzed by zeta potential test, FT-IR test, and XPS test. PEA is adsorbed on the surface of silicate in VTM by electrostatic adsorption and hydrogen bond adsorption, and the iron phase minerals are mutually repulsive, which realizes the separation of iron. The model of iron separation by flotation of PEA-2000 was established. Graphical
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Huangda Li,Jinhe Sun,Yongzhong Jia,Pengrui Zhang,Huiqun Ju,Lianjing Mao,Zhiyu Zhao,Xiao Li,Bo Li,Yan Jing,Fei Shao
Lithium isotopes with high abundances (6Li and 7Li) are crucial for the advancement of nuclear energy. In order to achieve the effective separation of 7Li, a Sudan I-[HMIm][BF4]-anisole extraction system was built employing Sudan I (1-benzeneazo-2-naphthol) as the extractant and hydrophobic ionic liquid [HMIm][BF4] as the co-extractant. By optimizing the organic and aqueous phase components, the extraction rate of the system could reach up to 26.30%, and the single-stage separation factor of the system could reach 1.015 ± 0.001. Meanwhile, the mechanism of the extraction process was investigated, and it was found that the ratio of Sudan I to lithium ions is 1 : 1, and the thermodynamic enthalpy change of the extraction process was less than zero (ΔH < 0), indicating that the extraction process of the system was an exothermic process. The construction of the Sudan-ionic liquid extraction separation system provides a new idea for the study of 7Li enrichment and separation and also provides a possibility for the industrialization of high-abundance 7Li enrichment.
研究领域:
核能科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hailin Yu,Huili Zhang,Chunlong Sun,Wen Yuan,Hongliang Li,Wei Jiang,Long Dong,Yingjun Wang,Hongsheng Liu
The complexity of oily sewage from oilfields has risen with the advancement of polymer flooding technology, thereby increasing the treatment challenge. In this study, a composite coagulant, PVPAM-PPFS, was proposed, inspired by octopus tentacles, with PVP as the backbone. FTIR , 1 H NMR and Rg radius of gyration were used to characterize the functional groups and conformation of PVPAM-PPFS in aqueous environments. The composite coagulant exhibits facile dispersion in water. Upon hydrolysis of PVPAM-PPFS, numerous molecular chains resembling octopus tentacles are formed and confirmed through Atomic Force Microscopy (AFM). When applied to oily sewage in oilfields, PVPAM-PPFS demonstrates enhanced interaction with emulsified oil layers, capturing colloidal particles in water and thereby facilitating efficient separation of oil, water, and flocs. Lastly, the mechanism of PVPAM-PPFS was analyzed through a combination of coagulation experiments and detection of floc morphology. PVPAM-PPFS will better interact with colloidal particles in water through increased charge neutralization, bridging adsorption, and sweeping capabilities. Significantly, an enhanced crude oil recovery rate is observed from the recovered oil droplets following the disruption of the emulsion layer.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）