JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Min Wang,Qi Wang,Yuqi Geng,Ning Wang,Yanzhao Yang
In this paper, a novel ionic liquid ([ACh][Tf 2 N]) was synthesized and applied for gold separation from secondary resources, which can be employed as both hydrophobic phase and extractant in the extraction process. By modulating various parameters, the extraction behavior of gold(III) under various conditions was investigated. The result shows that it is more suitable for gold(III) extraction with high salinity and lower acidity, whereas the extraction efficiency can reach 98.98% in 5 min. The anion exchange mechanism between [ACh][Tf 2 N] and gold(III) was proved by UV–vis, FT-IR, 13 C NMR and quantum chemical calculations . The gold(III) in organic phase was easily stripped by 1 mL 0.05 M CS(NH 2 ) 2 /0.1 M HCl. [ACh][Tf 2 N] also possesses excellent selectivity for gold(III) in the mixed metal solutions. Furthermore, its operating conditions combination: ionic liquid dosage, the concentration of HCl and NaCl were optimized to 0.55 g, 0.5 M and 2.5 M by response surface methodology (RSM), respectively. Hence, the [ACh][Tf 2 N] was regarded as a potential extractant for gold recovery from secondary resources.
研究领域:
化学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Xuan Huang,Ming Yi,Kewen Tang
To address resources shortage and environmental degradation, noble metal recovery from e-waste is in desperate need. Herein, to achieve selective extraction of gold (Au) and palladium (Pd) from practical e-waste, a series of tridentate thioether extractants are designed with ester functional groups at both ends of the thioether. By varying the chain length of the ester alkyl, the relationship between extractant structure and performance is further explored. The results indicate that the as-introduced tridentate structure facilitate the Au(III) and Pd(II) extraction, demonstrating a complex mechanism involving both coordination substitution and ion association. Notably, the extractant with the shortest carbon chain length and smallest molecular weight delivers outstanding extraction capacities of 920.2 mg/g for Au(III) and 280.7 mg/g for Pd(II). More importantly, it exhibits superior selectivity (∼100 %) for Au(III) and Pd(II) in complex metal solutions. This work guides the design of thioether-based extractants for sustainable recovery of noble metal from practical e-waste.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Ziyong Chang,Baili He,Xiaosha Gong,Xiaoyue Qi,Kexin Liu
Preparation of efficient adsorbents is of great significance for the recovery of precious metals from secondary resources. Herein, –NH 2 was successfully grafted on MIL-101(Cr) via hydrothermal reaction to improve the adsorption capacity of Au (Ⅲ) in aqueous solution. MIL-101(Cr)–NH 2 had a huge specific surface area (1016.50 m 2 ‧g −1 ), which can provide more adsorption sites for Au (III). At 298 K, the maximum adsorption capacity of Au (III) by MIL-101(Cr)–NH 2 was 792.43 mg∙g −1 and was higher than that by MIL-101(Cr) (140.83 mg∙g −1 ). The adsorption data was well fitted by Langmuir and pseudo-second-order models, confirming that the adsorption process conformed to single molecule adsorption and chemical adsorption . Mechanism study indicated that the adsorption of Au (III) by MIL-101(Cr)–NH 2 was initiated with electrostatic attraction and promoted by reduction and inner complexation between AuCl 4 - and protonated amino groups. During adsorption, Au (Ⅲ) was reduced to Au (0) and Au (I) by –NH 2 . Density functional theory (DFT) calculation demonstrated that MIL101(Cr)–NH 2 possessed higher binding affinity and more adsorption sites for Au (III) than MIL-101(Cr). Moreover, MIL-101(Cr)–NH 2 exhibited excellent selectivity towards Au (III) and good recyclability, which is promising in the recovery of precious metals.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Lei Jin,Cheng Liu,Fang-Zu Yang,De-Yin Wu,Zhong-Qun Tian
Coordination behavior between theophylline (THP) molecule and Au(III) ion as well as electrochemical reduction of THP-Au(III) complexing ion were studied in detail. UV–vis absorption spectroscopy clarifies that Au(III) is coordinated with THP in a 1:2 M ratio. Raman spectroscopy indicates that it is N in THP chemically bonding to Au(III), and density functional theory (DFT) together with time-dependent density functional theory (TD-DFT) further reveal that the specific N atom is N9 in the imidazole ring (N7H form). Based on the invented formula of cyanide-free gold electroplating with THP as a complexant, the electrode behavior of THP-Au(III) ion on the gold electrode was studied. The results show that the stability constant K f of THP-Au(III) ion is 2.7 × 10 35 , and the reduction of THP-Au(III) ion is in irreversible with diffusion control.
研究领域:
化学
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药理学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 16
·7695-7703
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IF 3.925
Qi Wu,Changfeng Zhao,Qinzhong Wang,Jing Liu
This study proposes the efficient separation of Au(III)/Pd(II)/Pt(IV)/Rh(III) through the 2-mercaptobenzothiazole-functionalised ionic liquid ([C6mim][2MBT]) using a cloud point extraction system. Direct cloud point extraction of Au(III) (about 99.9%) was realised without involving any functionalised ionic liquids. A significant enhancement of the Pd(II) extraction performance was found by adding rationally constructed [C6mim][2MBT]. Consequently, a fairly high extraction percentage of about 99.4% was obtained. However, further advancement of the proposed cloud point extraction showed that it could not be applied for the preconcentration of Pt(IV) and Rh(III) without adding stannous chloride, which plays a critical role in the segregation and could be adjusted by changing the hydrochloric acid concentration. Under the optimised conditions, the Rh(III) extraction process shows a high yield percentage (ca. 83.0%), where the majority of Pt(IV) was enriched in the aqueous phase. In addition, the underlying possible extraction mechanism was investigated using UV-vis, FT-IR and TEM measurements, which indicated that TX-114 acted as a solvent for the extracted metals. The developed procedure reveals efficient direct Au(III)/Pd(II)/Pt(IV)/Rh(III) separation using [C6mim][2MBT] via cloud point extraction.
研究领域:
分析化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Ronghao Liu,Jinjie Hao,Yangyang Wang,Yuanyuan Meng,Yanzhao Yang
A hydrophobic deep eutectic solvent (HDES) based on lidocaine and thymol was examined for selective extraction and separation of Au(III), Pd(II) and Pt(IV) in the acidic leaching solution of secondary resources. At first, the properties of HDES were characterized by 1 H NMR, DSC, TGA, RDF and ESP to prove its suitability for extraction process. In addition, extraction behaviors, maximum extraction capacities and competitive extraction experiment were investigated to explore the extraction ability of HDES. The results show that the maximum extraction capacity of Au(III), Pd(II) and Pt(IV) reached 761.2 g/L, 98.3 g/L and 299.3 g/L, respectively. Meanwhile, their extraction efficiency was affected by the changing acidity of aqueous. And then, ion-association mechanism in the extraction process was proposed through the analysis of FT-IR. Finally, a separation process was proposed for the recovery of Au(III), Pd(II) and Pt(IV) based on acidity control and KSCN, which achieved recovery efficiency of 97.8 % Au(III), 99.9 % Pd(II) and 89.5 % Pt(IV). After collecting and regenerating the used HDES, their extraction performance of Au(III), Pd(II) and Pt(IV) were still maintained.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 41
·19824-19833
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IF 3.925
Xiaoxia Liu,Yang Wu,Yangyang Wang,Huiying Wei,Jinxin Guo,Yanzhao Yang
Liquid–liquid extraction technology based on ionic liquids (ILs) is an efficient and environmentally friendly method to recover Au(III). This work aims to separate Au(III) from hydrochloric acid media using a novel IL [DBA-Pyr][NTf2], which is a pyrrolidinium-based IL functionalized with amide groups. Firstly, experiments have been carried out under optimal conditions, including the concentration, acidity and temperature. It turns out that low concentrations of hydrochloric acid help in Au(III) extraction, while the increase of chloride ion concentrations has an adverse effect. Then, through Job's method, extraction complexes with a molar ratio of [DBA-Pyr][NTf2]-to-Au(III) of 1 : 1 were determined. And, the anion exchange extraction mechanism was confirmed by FT-IR, UV-Vis, and 13C NMR spectroscopies and an electrostatic potential energy (ESP). Under the optimal extraction conditions, it has excellent selectivity to Au(III) compared to both base metal ions and platinum group metals (PGMs). Furthermore, Au(III) could also be recovered from the IL phase using an aqueous solution of thiourea in 95.6% with high selectivity. After 4 cycle experiments, an extraction efficiency of more than 90% is still maintained. The results show that [DBA-Pyr][NTf2] has potential application prospects in Au(III) recovery from hydrochloric acid media.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jin Wu,Yunlong Chen,Xianzhi Hu,Futing Zi,Yue Lin,Yufang Li
Developing an efficient and cleaner technology to recover gold (III) from aqueous media is vital for both economic and environmental perspectives. Herein, Cu 2 S was first found with well Au (III) recovery ability. Rod and flower-like Cu 2 S nanoparticles prepared by dynamic modulation, with jaggy micro-surface and relatively hard-wearing shape, was found with well Au (III) affinity. Results proved that this adsorbent could work better over a relatively wide pH from 2 to 5, and temperature from 25 to 55 °C, and that attained high gold capacity of 5,582 mg/g which obviously exceeded other reported adsorbents, indicating well application potential. XRD, TEM, and XPS studies demonstrated that adsorbed Au (III) was reduced as Au (0) by Cu 2 S. DFT studies verified that Au (III) recovery is related with the formation of “Cu-S-Au” bridge-like linkage and the unceasingly produced new adsorption sites after adsorbed Au atom’s migration and agglomeration. Au (III) recovery ability and selectivity in the actual sample was proved to be well too. Also, more than 90% gold on Cu 2 S could be recovered with HNO 3 . This study is of great theoretical and practical significance for cleaner Au (III) recovery from various aqueous media.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
HYDROMETALLURGY
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2024
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IF 4.8
Ronghao Liu,Jun Li,Xiaoxia Liu,Xiaolu Yin,Yanzhao Yang
The effective and environmentally friendly recovery of gold from secondary resources has recently received increased attention. Hydrophobic deep eutectic solvent (HDES) composed of N , N -di-butylacetamide and 1-decanoic acid was used to construct the liquid-liquid extraction system to extract Au(III) from HCl medium. At first, DSC, TGA, FT-IR, and 1 H NMR were used to describe the evidence of internal hydrogen bond interaction. The above evidence was verified in the molecular dynamics study of HDES. Then, a series of optimization experiments were carried out to investigate the extraction behaviors of HDES. Based on the results of optimization experiments, response surface method was used to explore the best experimental conditions and the results showed that HDES extracted 99% Au(III) under 0.56 mol/L HCl, 2.19 mol/L NaCl, and 5.83 mmol/L Au(III), and the maximum loading reached 77.0 mg/g. Further studies on the kinetics and thermodynamics of the extraction were used to propose an ion association mechanism. In addition, using 0.1 mol/L thiourea as the stripping agent, HDES displayed outstanding Au(III) selectivity and maintained the extraction efficiency in tests which involved 5-cycles. Overall, this study provides a green and efficient Au(III) recovery strategy for secondary resources.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2014
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IF 1.019
Ou Sha,Xiashi Zhu
A new simplified extraction of gold(III) using a room-temperature ionic liquid prior to determination by flame atomic absorption spectrometry has been developed. The extraction method uses 1-butyl-3-methylimidazolium hexafluorophosphate without a chelating agent. The parameters of the extraction system were investigated in detail. Under the optimized conditions, a linear range of 0.19 to 38.20 µg · mL−1, a limit of detection of 0.072 µg · mL−1, an enrichment factor of 10.0, and an extraction capacity of 6.6 mg · g−1 were obtained. The extraction mechanism and the selectivity of 1-butyl-3-methylimidazolium hexafluorophosphate for gold(III) were also investigated. The method was applied for the determination of gold(III) in water samples with satisfactory results.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
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2024
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IF 6
Yanping Li,Haoran Liu,Ronghao Fang,Jiamin Jin,Feng Yang,Jian Chen,Juzheng Zhang
Metal-based drugs have been used in the clinical treatment of tumors for over 30 years. However, no metal-based drugs have been clinically approved to treat glioma. Although metal complexes have excellent cytotoxicity, their most critical problem is crossing the blood–brain barrier. Therefore, to enable metal complexes to cross blood–brain barrier and target glioma therapy, herein, we propose to rationally used the basic structure of diazepam (5-chlorobenzophenone) and thiosemicarbazide to synthesize gold (Au) complexes C1, C2 and C3 with antiglioma activity. The C3 complex with two methyl groups attached to the N3 of thiosemicarbazone exhibited excellent cytotoxicity to glioma cells through its multiaction mechanism against glioma, inducing apoptosis, autophagy death, and deoxyribonucleic acid damage. In addition, the synthesized C3 complex can effectively cross the blood–brain barrier and accumulate in glioma, considerably decreasing the untoward reaction in vivo . Our findings provide a novel strategy for designing metal-based complexes for the treatment of glioma.
研究领域:
药理学
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肿瘤学
·
金属药物设计
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Rengui Weng,Guohong Chen,Yifan Liu,Yuancai Lv,Chunxiang Lin,Xiaoxia Ye,Minghua Liu
A reductive cellulose-based aerogel (VTCA) was fabricated from cellulose by introducing valonea tannin through cross-linking reaction. VTCA owned high porosity of more than 96% with the average pore size of 30–50 µm, and it exhibited good adsorption performance for Au(III) at a wide pH values range (1−8) with the max adsorption capacity of 243.1 mg g −1 . VTCA showed good adsorption performance for Au(III) under the interference of various co-existing ions. The adsorption obeyed the pseudo-second-order kinetic model and the Langmuir adsorption isotherm model, and temperature rise was favorable for adsorption. The adsorption-reduction mechanisms mainly involved electrostatic interaction, chelation adsorption and reduction. Au(III) could be effectively adsorbed onto the surface of VTCA by electrostatic attraction and chelation, and then reduced in situ to Au 0 by phenolic hydroxyl on tannic structure. This study provides a new adsorbent with the advantages of convenient preparation and high efficiency, and it has great application prospects in the enrichment and recovery of precious metals in waste liquid and the treatment of oxidized pollutants.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）