SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuyue Feng,Chenqian Chen,Wenjuan Zhang,Jianyong Che,Chengyan Wang,Yongqiang Chen
Nickel and cadmium are critical materials in the clean energy sector, but their limited availability poses significant challenges. Recycling these metals from secondary sources can mitigate supply risks, yet their separation during recovery is often difficult, especially when striving to conserve energy and minimize environmental impact. This study proposed an electrochemical method for the efficient separation and recovery of cadmium from Cd-Ni solutions. Under optimal conditions of 0.5 V applied voltage, 10 g/L initial acid concentration, 50 °C temperature, and a 2h duration, over 95.6 % of cadmium was recovered with a purity of 93.3 %, while nickel loss was restricted to just 5.38 %. The high separation efficiency is attributed to the preferential reduction of cadmium over nickel, even at low concentrations, as confirmed by impedance spectroscopy and SEM analysis. Cadmium deposition occurred exclusively at the anode, with minimal nickel loss primarily resulting from the formation of Ni(OH) 2 . Kinetic analyses revealed that zinc dissolution at both the anode and cathode followed a first-order rate, with the anode dissolving more rapidly, thereby facilitating cadmium deposition. This method offers a sustainable option for recovering these metals from secondary sources by effectively integrating electrochemical and cementation processes.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Lan Yi,Jie Feng,Mario Gauthier,Wen-Ying Li
Anthracene (AN) is an important fine chemical feedstock, mainly derived from the anthracene oil fraction of high-temperature coal tar. The traditional solvent crystallization method used to obtain anthracene involves large amounts of solvents. A method with a high separation capacity and a high selectivity needs to be developed urgently. To this end, the composition of crude AN oil and the solubility of its main components in xylene were determined, and phenanthrene in crude AN oil was extracted with xylene. Pure deep eutectic solvents (DESs) and DESs–organic solvent mixture were then applied to separate anthracene and carbazole, respectively. Based on the distribution coefficient, selectivity, and purity of the AN product, the influence of organic solvent type, the molar ratio of DESs to organic solvent, and DESs type on the separation efficiency were investigated. Finally, the separation mechanism was investigated with density functional theory calculations and UV–visible spectroscopy. The results show that the phenanthrene content decreased from 25.5% to 2.6% and most of other condensed aromatics in crude AN were removed after washing twice with xylene. DESs–organic solvent mixtures had better performance than pure DESs for the separation of anthracene and carbazole, and under optimal condition, the 97.5% purity of AN is acquired in a single separation step with a tetraethyl ammonium chloride–glycerol DESs–DMF mixture. The more complicated interactions between phenanthrene and xylene than between anthracene / carbazole and xylene favored the removal of phenanthrene. The hydrogen bond with the minimum bond energy (-17.6 kJ/mol) between DESs and carbazole is also stronger than that with the maximum bond energy (-16.8 kJ/mol) between DESs and anthracene. Adding DESs to organic solvent can enhance the interactions between carbazole and the solvent, but had no significantly influence on interactions between anthracene and the solvent, thereby facilitating the separation of anthracene and carbazole.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xilin Geng,Qionghua Xie,Yundong Zhu,Guocheng Yao,Liangshi Wang
Germanium is a strategic metal that is challenging to enrich and purify without any side effects, especially stability and selectivity. Here the role of carbonyl acid in selective separation of germanium from complex industrial liquids was highlighted. Integrating theoretical and experimental analyses, carbonyl acids exhibit strong binding ability and high selectivity to germanium was demonstrated. The first set of carbonyl acid extractant (CAE) for germanium extraction was successfully synthesized with a solubility of less than 50 mg/L at pH = 0. The process analysis exhibits the extraction rate of germanium in a single stage by CAEs exceeds 99.9 %, while the separation factor surpasses 10 3 , far beyond 10 1 of hydroxamic acids. Furthermore, the stripping rate for germanium in a single stage exceeds 83.0 %, with germanium accounting for over 99.9 % of the total metal content in the stripping solution. The CAE extraction process is straightforward and characterized by high germanium separation efficiency. The development of CAE not only realises the stable, green, low-carbon, and high-efficiency purification of germanium, but also the universality and inspiration of CAE make it highly significant and valuable in both theoretical research and practical applications.
研究领域:
冶金学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 39
·394003
·
IF 3.44
Tao Fang,Yongsheng Guo,Songhua Cai,Ningsi Zhang,Yingfei Hu,Shiying Zhang,Zhaosheng Li,Zhigang Zou
Many metal-oxide candidates for photoelectrochemical water splitting exhibit localized small polaron carrier conduction. Especially hematite (α-Fe2O3) photoanodes often suffer from low carrier mobility, which causes the serious bulk electron-hole recombination and greatly limits their PEC performances. In this study, the charge separation efficiency of hematite was enhanced greatly by coating an ultrathin p-type LaFeO3 overlayer. Compared to the hematite photoanodes, the solar water splitting photocurrent of the Fe2O3/LaFeO3 n–p junction exhibits a 90% increase at 1.23 V versus the reversible hydrogen electrode, due to enlarging the band bending and expanding the depletion layer.
研究领域:
材料科学
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光电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 1
·334-341
·
IF 10.733
Guoqiang Zhang,Xun Yang,Chuanxin He,Peixin Zhang,Hongwei Mi
Photocatalytic systems capable of precisely regulating oxygen vacancy (OV) concentrations, which could help illuminate the effects of the OV concentration on N2 fixation activity, are still scarce. Here, we demonstrate that excessive OVs in TiO2, while increasing the adsorption activation capacity of N2 molecules, exhibit disappointing activity due to a decrease in charge separation efficiency. With optimized OV concentration, TiO2 can increase the charge separation efficiency 3-fold and show significant activation towards N2 molecules. The normalized N2 photofixation rate is 324.86 μmol h−1 g−1 (full spectrum) and the corresponding apparent quantum yield (AQY) under 365 nm illumination reaches 1.1%, which are relatively high levels compared to reports in the literature. The origin of this excellent activity is clearly attributable to the OV defect structures, which coordinate the charge separation efficiency and the dissociative adsorption capacity of N2. This work establishes the relationship between OV concentration and activity, and helps to construct a highly efficient nitrogen-fixing photocatalyst by optimizing the OV concentration.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Yadan Luo,Yan Li,Liming Cao,Jiatian Zhu,Baojuan Deng,Yajun Hou,Chen Liang,Caoxing Huang,Chengrong Qin,Shuangquan Yao
Glycolic acid has chemical properties similar to those of formic acid. Therefore, similar to formic acid pretreatment, glycolic acid pretreatment has the separation effect of hemicellulose. In this study, eucalyptus hemicellulose was effectively separated by glycolic acid pretreatment. The effects of glycolic acid concentration, temperature and time on the separation of cellulose, hemicellulose and lignin were investigated. The optimum conditions were acid concentration 5.40%, temperature 140 °C, time 3.0 h. The highest yield of xylose was 56.72%. The recovery rate of glycolic acid was 91%. Compared to formic acid, the yield of xylose increased to 10.33% while that of lignin decreased to 11.08%. It showed high selectivity for hemicellulose separation, yielding 65.48% hemicellulose with 72.08% purity. The depolymerization and repolymerization of lignin were inhibited. The integrity of the cellulose structure was preserved. It provides theoretical support for the fractional separation and high-value transformation of lignocellulosic biomass.
研究领域:
生物化学
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生物质能
·
林业工程
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shengchao Xu,Wanting Ma,Junxiong Zhao,Jiaming Yu,Qifeng Wei,Xiulian Ren
Lactic acid (LA) is a typical high added-value chemical and platform molecule derived from renewable biomass. To realize high efficiency and green separation of LA is of both scientific and practical significance. In this work, we proposed a novel mechanism of in-situ formation of hydrophobic deep eutectic solvents (HDES) to couple the separation of LA and synthesis of HDES . Due to the high solubility of LA as hydrogen bond donor in water, three hydrophobic lactams ( N -Octyl-2-pyrrolidone (NOP), N -Dodecyl-2-pyrrolidone (NDP) and 2-Octyl-4-isothiazolin-3-one (OIT)) were optioned as hydrogen bond acceptors. The effect of lactam molecular structure on separation efficiency was discussed and compared in detail. The compositions of HDES forming in-situ were found to be 1.50 for NOP and NDP to LA while 1.20 for OIT to LA using experiments of slope method and continuous variations method. The key evidence of formation of HDES was confirmed by FT-IR, frontier molecular orbital analysis and interaction region indicator analysis. The multistage counter-current extraction experiment results showed the in-situ formation of HDESs can transfer 99% of LA from fermentation broth to the HDES, and LA was separated completely from the impurities. This work provided a new perspective on lactic acid separation and its potential industrial applications.
研究领域:
生物化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Xue-lin Dong,Jun-han Liu,Zheng-xun Jia,Shao-zhan Tang,Shuo-yun Tong,Yu-xiang Xiong,Lei Ouyang
Background The quantification of rare earth elements (REEs) in barite-associated geological samples is complicated by persistent matrix effects from coexisting elements and overlapping mass spectral interferences. These analytical challenges are particularly pronounced in samples containing high concentrations of light REEs (LREEs), which induce spectral overlaps on heavy REEs (HREEs) during inductively coupled plasma mass spectrometry (ICP-MS) measurements. Results A two-stage precipitation protocol achieved separation efficiencies exceeding 93.0 % for nine matrix elements (Ba, Na, Sr, etc.), while subsequent 717-type anionic resin chromatography enabled group separation of REEs. Sequential elution with methanol-nitric acid (3.40 mol/L, 7:3 v/v) and 0.20 mol/L nitric acid solutions yielded distinct recovery profiles: HREEs (Eu–Lu) showed >90.0 % recovery in the first elution phase, followed by quantitative isolation of LREEs (La, Ce, Pr) in the second phase. The method was verified by using certified reference materials (GBW07892, GBW07893), and the determination results were consistent with the certified values. The application to three natural barite-associated REE ores was also realized. Significance This methodology resolves critical limitations in REE analysis through matrix element elimination and controlled LREE/HREE fractionation. The demonstrated 90.2–106.9 % recovery range across all REEs confirms operational robustness, while successful implementation in certified materials and field samples establishes reliability for geochemical characterization. The elution sequence optimization provides a template for analyzing REEs in barite-associated ores.
研究领域:
地球化学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jie-hao Li,Jie Ren,Ying-juan Hao,Er-peng Zhou,Yue Wang,Xiao-jing Wang,Ran Su,Ying Liu,Xue-han Qi,Fa-tang Li
Constructing heterojunctions would result in the change of valence band position, which is an important factor determining the oxidative ability of photo-induced holes, has received scant attention. In this paper, β-Bi 2 O 3 /Bi 2 O 2 CO 3 composites with different ratios were obtained via ionic-liquid-assisted solvothermal and in-situ calcination processes. UV–vis DRS, Mott-Schottky test, and Kelvin probe measurement showed the change of band gaps of β-Bi 2 O 3 and Bi 2 O 2 CO 3 before and after heterojunction formation. SPV, ESR, photocurrent, and scavenger experiments identified the separation efficiency of photo-generated electrons and holes, as well as the active species generated in the photocatalytic process. The photocatalytic mechanism was investigated by the degradation of Rhodamine B (RhB) upon visible-light and simulated sunlight, respectively. The results demonstrated that β-Bi 2 O 3 /Bi 2 O 2 CO 3 heterojunctions possessed enhanced separation efficiency and higher degradation ability than the individuals under visible-light irradiation due to effective electron transfer. However, lower performance under simulated sunlight was observed, although their separation efficiency remained high. The decisive reason for this was that the up-shift of valence band of Bi 2 O 2 CO 3 induced by hybridization and the transition of holes from VB of Bi 2 O 2 CO 3 to that of β-Bi 2 O 3 with more negative potential decreased the oxidative ability of holes, which surpassed the positive influence of enhanced separation efficiency.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Fan Wu,Rishun Li,Anfeng Yao,Zhixin Li,Huiqin An,Hui Ye,Qingping Xin,Yuzhong Zhang,Hong Li,Lizhi Zhao
Liquid-filled porous membranes have been developed for oil-water separation with antifouling properties. However, the degradation of fouling resistance and reduction of separation efficiency may occur due to the poor stability of the liquid layer. Prompted by the mesoporous structure and high porosity characteristics of aerogel , the membrane with aerogel-network-stabilized slippery surfaces was fabricated by in situ growth of silica aerogel coating on the polyethylene terephthalate (PET) fiber membrane and silicone oil filling. Owing to the oil-locking ability of the aerogel coating, the liquid layer of the membrane showed excellent stability against chemical corrosion and high-temperature, improved stability against shear and mechanical abrasion , and good hot water tolerance and self-healing performance. The prepared liquid-filled membrane can efficiently separate water-in-oil emulsion. In filtrating-cleaning cycles, the membrane showed antifouling property and durability with high separation efficiency and flux recovery. The membranes with highly stable liquid-filled surface provide promising prospects in industrial oil treatment and oil spill recovery.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
ISIJ INTERNATIONAL
·
2018
·Vol. 58
·期 7
·1361-1367
·
IF 1.35
Jia-yun Wang,Hong-juan Li,Lei Li,Hua Wang,Yu Wang,Yong Yu
A process of removing iron from copper-based alloy scraps using oxidation slagging method is researched, in which the iron is oxidized to FeO and then reacted with SiO2 forming Fe2SiO4 and enter into the slag phase. The addition of SiO2 could restrict the Fe3O4 generation through the transformation of FeO to 2FeO·SiO2 in a certain O2 pressure, which is favorable to decreasing the melt viscosity and increasing the separation efficiency of Cu and Fe. Under optimized conditions of O2 flow rate of 40 ml/min, temperature of 1673 K, oxygenation time of 8 min, and SiO2 amount of 2.17 mass%, Fe content in the metal phase is decreased to 0.0030 mass% with Cu loss rate being of 1.14%.
研究领域:
冶金工程
·
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
Zehao Chen,Ting Zhao,Qing Tan,Jihao Zuo,Shouping Xu,Yunjun Nong,Xiufang Wen,Pihui Pi
The crude oil spillage and large-scale industrial release of oily effluents has led to significant ecological degradation and resource wastage. Traditional superwetting materials encounter intractable challenges for treating surfactant-stabilized oil–water emulsions, including trade-off effect of permeation flux and separation efficiency, and low emulsion processing life. These issues considerably impede advancements in oil–water separation industry. In order to enhance the demulsification durability of materials while ensuring high separation efficiency and flux, this work doped perfluorooctanoic acid (PFOA) onto the modified sponge surface with superhydrophilic charged surface, and a unique in-air superhydrophilic-oleophobic sponge was prepared. This special surface allows rapid water phase permeation yet offers remarkably more stable oleophobicity compared with traditional underwater oleophobic materials when processing a large amount of emulsions. The intrinsic oleophobicity endows the sponge outstanding fouling resistance and greatly increases the one-cycle emulsion treatment amount up to 1695 L·m −2 . Moreover, the sponge's inherent long permeation channels and surface charge maintain a high separation efficiency of over 97 %. The large pores of the sponges and superhydrophilic surface provide a high permeation flux exceeding 40,000 L·m −2 ·h −1 . The sponge with high separation efficiency, flux, and capacity marks a significant advancement, offering a promising strategy for superwetting material applications in oil-in-water emulsion separation fields.
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
危险品化学品经营许可证（带存储）