Journal of Cleaner Production
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2023
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IF 11.1
Jianchun Qin,Shunyan Ning,Jianing Xu,Jishu Zeng,Zheyu He,Liang Luo,Fengtao Hu,Yimin Li,Toyohisa Fujita,Yuezhou Wei
The treatment of hazardous LCD is a complicated coupled process, which contains a large number of impurity metals, especially Fe(III), increased the difficulty of In(III) recovery. Moreover, the defects of the traditional extraction process, such as extractant ageing quickly, difficulty to back-extraction, and easy emulsification , seriously restricted the efficient and environmentally friendly recovery of In . Therefore, a novel adsorbent (D2EHPA/SiO 2 –P) was synthesized for the separation and recovery of In(III), and a new recovery process was developed to eliminate the defects of traditional In recovery process in this study. D2EHPA/SiO 2 –P exhibited excellent adsorption selectivity and kinetics for In(III), and the adsorption equilibrium was obtained within 3 min. The adsorption process of In(III) conformed to the pseudo-second-order and Langmuir model. In(III) on D2EHPA/SiO 2 –P was desorbed by 3 M HCl solution, and D2EHPA/SiO 2 –P still had high adsorption and desorption efficiency for In(III) after 5 times of adsorption-desorption cycle experiments. The adsorption mechanism study found that the O–H bond on the D2EHPA participated in the substitution reaction and bonded with In(III) as the adsorption site during the adsorption process. The bond order value of In–O bond was the lowest in the D2EHPA adsorbed In(III) during the desorption process, indicating that In–O bond was easy to break and desorption form D2EHPA. Finally, in the 0.1M H 2 SO 4 system, a new process of using H 2 C 2 O 4 to reduce Fe(III) in advance, and then using D2EHPA/SiO 2 –P to adsorb In(III) was designed to recover In(III) without producing toxic gas, which realized the separation of In(III) and Fe(III). Our findings showed that the developed recovery process was both efficient and environmentally friendly, which had the potential for industrial application of In recovery from hazardous LCD.
研究领域:
环境科学
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材料科学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Hongru Qu,Yimin Zhang,Hong Liu,Nannan Xue,Yiping Wang
In traditional methods for preparing vanadium electrolytes, challenges include lengthy processes, high costs, and difficulties in deeply separating vanadium and impurities. This study introduces an innovative approach utilizing an H 2 O 2 -NaClO efficient selective oxidative stripping system within the D2EHPA extraction process. This method was optimized at a pH of 12, with a phase ratio (O/A) of 6:1, a reaction temperature of 45 °C, and a reaction time of 8 min. The concentration of H 2 O 2 was set at 1.5 %, with a volume ratio between H 2 O 2 and NaClO of 95 % to 5 %. Under these conditions, the vanadium stripping rate in a single stage reached 95.13 %. The low concentration (1.5 %) of H 2 O 2 increased the single-stage stripping rate of vanadium by nearly 50 %, reducing H 2 O 2 usage by at least 25 %, while NaClO enhanced the stability of H 2 O 2 . The prepared electrolyte contained impurity ion concentrations of less than 10 ppm, meeting Chinese national first-class standard of Electrolyte for vanadium flow battery. The electrolyte demonstrated excellent electrochemical and charge–discharge performance, with Coulombic efficiency, voltage efficiency, and energy efficiency reaching 85.45 %, 89.58 %, and 76.55 %, respectively, achieving 95 % of the standard electrolyte’s performance. This method significantly shortens the process and reduces costs by 25.29 % compared to the traditional V 2 O 5 dissolution method. This study offers a novel approach to producing high-purity electrolytes through a shorter, cost-effective process.
研究领域:
化学工程
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材料科学
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高影响因子
Journal of Environmental Chemical Engineering
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2025
·Vol. 14
·期 1
·120757
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IF 7.2
Yiping Wang,Tao Liu,Yimin Zhang,Nannan Xue,Pengcheng Hu
Di-(2-ethylhexyl) phosphoric acid (D2EHPA) is the predominant extractant for vanadium recovery from acidic leachates. However, its narrow pH extraction window necessitates pH adjustment prior to extraction, generating significant neutralization residues and causing vanadium loss. Therefore, enhancing the pH adaptability of D2EHPA to enable direct vanadium extraction at low pH is of significant importance. This study proposes an octanohydroxamate (OHA)-D2EHPA extraction system, which broadens the extraction pH range through intermolecular cooperative coordination, providing an innovative solution for the efficient separation of vanadium from impurity ions under low-pH conditions. Under optimized conditions (OHA:V molar ratio of 2:1, pH of 0.6, D2EHPA concentration of 20 vol%, organic-to-aqueous volumetric phase ratio(O/A) (phase ratio(O/A)) of 1:2, 20 min extraction at room temperature), a three-stage countercurrent extraction process achieved a vanadium extraction efficiency of 99.56 %. Using a mixed solution of sulfuric acid and oxalic acid as the stripping agent under optimal conditions (0.4 mol/L H 2 C 2 O 4 +2 mol/L H 2 SO 4 , phase ratio(O/A) of 5:1, 20 min stripping at 25°C), three-stage stripping reached a vanadium stripping efficiency of 99.21 %, enabling highly efficient separation of vanadium from impurities. Studies confirm that the extraction process follows a H⁺-desorbing cation-exchange mechanism, where synergistic dehydrogenation of N-OH groups in OHA and P-OH groups in D2EHPA facilitates vanadium coordination. Vanadium complexes in the organic phase exist as [C 8 H 16 NO 2 ]VO, [C 8 H 16 NO 2 ]VOA, and [C 8 H 16 NO 2 ]VOA(HA). Among these, [C 8 H 16 NO 2 ]VOA(HA) exhibits the lowest binding energy for vanadium and is preferentially formed during extraction. Consequently, the OHA-D2EHPA system achieves highly efficient vanadium extraction at low pH.
研究领域:
湿法冶金
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溶剂萃取
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无机化学
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金属回收
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工艺优化
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高影响因子
HYDROMETALLURGY
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2026
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IF 6.3
Junjie Xiang,Xiaozhou Zhou,Jialin Qing,Wenjuan Guan,Xinsheng Wu,Mingyu Wang,Qinggang Li,Zuoying Cao,Guiqing Zhang,Shengxi Wu
MSL255 was synthesized as a pyridyl ligand for Ni/Co extraction. • D2EHPA–MSL255 gave β(Ni/M) > 249 and β(Co/M) > 41 over impurities. • Over 99% of Ca, Mg and Mn was removed with minimal Ni loss. • Co and Ni were stepwise stripped at different acidities. • FT-IR, MS and DFT revealed selective Ni/Co coordination. Complex acidic Ni/Co liquors from low-grade ores and secondary resources usually contain abundant impurity cations, making selective Ni/Co enrichment highly challenging. Industrial routes for producing mixed sulfide precipitate (MSP) or mixed hydroxide precipitate (MHP) are technically mature, but often suffer from long flowsheets, Ni/Co losses, and impurity-rich intermediates requiring further purification. Direct solvent extraction offers a promising alternative owing to its high selectivity, efficient separation, and easy automation. However, conventional acidic organophosphorus extractants, such as D2EHPA, PC-88 A, and Cyanex 272, suffer from limited Ni/Co selectivity due to severe impurity co-extraction. Moreover, some reported synergistic systems remain constrained by insufficient acid resistance, limited loading capacity, or poor industrial applicability. To address these issues, a neutral ligand, MSL255, integrating two pyridyl groups with a hydrophobic aromatic ether framework, was designed and synthesized. When combined with D2EHPA, the optimized formulation provides pronounced synergistic enhancement, yielding synergistic factors (SF) of 87.2 for Ni(II) and 23.3 for Co(II), while impurity ions exhibit SF < 1. Correspondingly, the separation factors (β) reach β(Ni/M) > 249 and β(Co/M) > 41. The system removes more than 99% of Ca, Mg, and Mn with minimal Ni loss, and displays a clear stepwise stripping sequence in which Co is released at lower acidity whereas Ni requires higher acidity for complete stripping. Spectroscopic characterization together with DFT/ESP analysis confirms that MSL255 stabilizes Ni/Co–extractant adducts while weakening the coordination of impurity ions, thereby enhancing selectivity. Overall, the D2EHPA–MSL255 system provides a low-acidity, high-selectivity strategy for Ni/Co enrichment from Ca–Mg–Mn sulfate media.
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高影响因子
CHEMICAL PAPERS
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2018
·Vol. 73
·期 3
·583-589
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IF 0.963
He Dongmei,Cao Zuoying,Zhang Guiqing,Zeng Li,Li Qinggang,Guan Wenjuan
Nickel is one of the most important strategic metals. With the depletion of high-grade nickel sulfide ores, electroplating wastewater as a kind of secondary resources, its utilization has great significance in nickel recycling industries. A novel extractant, [(2-ethyl-hexylamino)-pyridin-4-yl-methyl]-phosphonic acid diethyl ester (L) was synthesized and used with D2EHPA (di-2-ethyl-hexyl phosphoric acid) to extract and recover nickel from simulation electroplating wastewater. The optimum conditions were determined by single-stage extraction process, and the extraction efficiency and the selectivity of Ni could be greatly enhanced by synergistic binary mixture of L–D2EHPA system. The coordination mode of Ni-extracted complex was studied through the analysis of Fourier transform infrared spectroscopy. It was cued that Ni ions might be coordinated with the N atom from the pyridine ring of L and the O atom of P=O in D2EHPA. Moreover, hydrogen bonds between the O atom of P=O in D2EHPA and the H atom of water molecules might be formed.
研究领域:
环境工程
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化学工程
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材料科学
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高影响因子
GREEN CHEMISTRY
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2023
·Vol. 25
·期 23
·10020-10032
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IF 9.8
Qiyuan Zheng,Li Zeng,Zuoying Cao,Shengxi Wu,Qinggang Li,Mingyu Wang,Wenjuan Guan,Guiqing Zhang
As the production of electric vehicles and lithium-ion batteries continues to rise, concerns over resource scarcity and supply shortages of critical metals, including Cu, Ni, Co, Mn, and Li, have become increasingly urgent. To address these concerns and promote environmental protection, there is a growing demand for the recycling of hazardous waste containing these critical metals as secondary resources. Therefore, this paper proposes a novel synergistic solvent extraction system of D2EHPA-NNPA, which fills a gap in the lack of a suitable extraction system for the hydrometallurgical industry of secondary resources containing Cu, Ni, Co, Mn, and Li. With the specific extraction sequence of D2EHPA-NNPA, a novel process has been designed and proposed for the stepwise extraction of Cu, Ni, Co, Mn, and Li from secondary resources, which significantly simplifies process flows while avoiding cross-contamination of the extractants and the production of industrial wastewater. Furthermore, the proposed “extraction-scrubbing-stripping” process has been investigated from both macroscopic and microscopic perspectives, demonstrating that the novel synergistic solvent extraction system of D2EHPA-NNPA is a viable option for industrial applications to promote a circular economy and achieve sustainability objectives.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Xiangshang Chen,Zhenjie Ma,Xihua Ren,Yue Jia,Huayan Chen,Xiaolong Lu
A novel and efficiently anchored 3-dimensional network extracting membrane (3D-NEM) with a thin functional surface layer comprising extraction carrier Bis(2-ethylhexyl) phosphate (D2EHPA) for nickel extraction was designed and studied in this paper. The active sites on the supporting Polytetrafluoroethylene (PTFE) hydrophilic ultrafiltration membrane were introduced by treating PTFE surface with potassium permanganate. Polydimethylsiloxane (PDMS) and Polymethylhydrosiloxane (PMHS) were applied to prepare a 3D network layer which is tightly anchored to the PTFE surface by introducing a crosslinking agent vinyltriethoxysilane (VTES). The prepared 3D-NEM was characterized by SEM, EDS, ATR-IR, XPS and etc. The influence of preparation parameters of 3D-NEM was studied and compared systematically. The optimum preparation conditions of 3D-NEM were based on a PDMS/PMHS/VTES ratio of 2:1:0.1 and a total polysiloxane concentration of 8 wt%. The operation stability test confirmed the average flux of the 3D-NEM in 72h reached 1871.16 mg·m -2 ·h -1 , and only 14.42% flux declined at the end of operation. The proposed designed 3D network structure produced a 5.5 μm-functional extracting layer which has benefits in both effective fixing of D2EHPA and tight anchor to the supporting surface. This work has dual advantages in improving flux and reducing extractant loss compared to supported liquid membrane (SLM) and polymer inclusion membrane (PIM) processes.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
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