ACS Sustainable Chemistry & Engineering
·
2019
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IF 6.97
Ning Wang,Qi Wang,Yuqi Geng,Xu Sun,Duokun Wu,Yanzhao Yang
Three novel ionic liquids were synthesized. Their binary mixtures with water exhibit tunable thermomorphic behaviors involving monophasic–biphasic transition. Through electrostatic potential maps, we predicted the ability of the three ionic liquids to form solvated hydrogen bonding to estimate the upper critical solution temperature (UCST) ordering of their binary mixture with water. Then, experimental verifications were carried out of the prediction. Three homogeneous liquid–liquid extraction systems were used to extract Au(III) from acidic chloride media based on the thermodynamic property. By comparing the UCST and extraction efficiency of the three systems, the N-carboxymethyl-ethyl-ester-N-methylmorpholinium bis(trifluoromethylsulfonyl)imide ([EtbetmMor][Tf2N]) was selected for subsequent systematic extraction study. High-efficiency extraction and extraordinary selectivity of gold were achieved by optimizing a series of factors affecting the extraction process. The extraction mechanism was confirmed in further. Finally, the extracted gold could be recovered from the ionic liquid phase by precipitation stripping with oxalic acid. The [EtbetmMor][Tf2N] could be regenerated simply by mixing the raffinate containing [Tf2N]− with the [HbetmMor]Cl phase separated with gold after stripping. It is reasonable to think that the environmental friendliness and high efficiency of this new extraction system make it a strong candidate in the field of gold recycling.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Zareen Zuhra,Shafqat Ali,Sajjad Ali,Hu Xu,Rongzhen Wu,Yuanyuan Tang
Designing materials for selective recovery of precious metals is a critical challenge in response to recent outbreaks of electronic wastes owing to economic and environmental concerns. We introduced high-performance hybrid materials (MCNTs) comprising of six-amino groups based on hexaaminobenzene metal-organic framework (HAB-MOF) and carbon nano-tube (CNT) sponge for selective recovery of Au(III) and Pd(II). Among all MOFs ever reported in the literature, the particular synthesized 30-MCNT (30 mg HAB-MOF on CNT sponge) exhibited the highest adsorption capacity ( q e ) of 1832 mg/g (45 °C, pH 3.0) for Au(III) and 1651 mg/g (45 °C, pH 1.0) for Pd(II), which can be regarded as a benchmark in the MOF family. The highly selective nature of 30-MCNT was examined in the presence of ten different metal ions and the results showed that the Au(III)/Pd(II) adsorption efficiency was decreased by only 5–10%. Moreover, the Au(III) and Pd(II) recovery was maintained ∼ 100% from the initial solution with metal concentration of 200 mg/L. The superior performance was mainly attributed to the role of abundant amino groups in the hybrid framework, developing several types of interactions with Au(III) and Pd(II) ions such as hydrogen bonding, electrostatic interactions, acid-base affinity and π-π inner sphere complexation. Furthermore, the remarkably high surface area and robust chemical and mechanical stability of CNT-sponge provided an exceptional support for impregnation of HAB-MOF to avail greater active sites and easier handpicked recycle. Density functional theory (DFT) simulation and X-ray photoelectron spectroscopy (XPS) studies were employed to explore the interaction mechanisms during the adsorption processes. Owing to facile and environment-friendly synthesis, excellent recovery and recycling, the material can be possibly considered for industrial application in precious metal recovery.
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ELECTROANALYSIS
·
2021
·Vol. 33
·期 11
·2278-2285
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IF 3.223
Yuan Xiang,Hao Huang,Dan Wang,Juan Du,Dongping Wu,Wanming Xiong,Yanping Hong,Jinyin Chen,Xiaoning Liao
Herein, an organometallic Au(III) catalyst was easily prepared via self-assembly method using chloroauric acid (HAuCl 4 ) and cetyltrimethylammonium bromide (CTAB). The electrode fabricated by the catalyst not only shows extended anodic potential window compared to that of Au nanoparticle-based electrode, but also possess the high electrocatalytic activity in the selective oxidation of Ochratoxin A. Under optimized conditions, the modified electrode exhibits a wide linearity range from 1.0×10 −7 to 1.0×10 −5 mol/L and a low detection limit of 2.9×10 −8 mol/L (S/N=3). Furthermore, the electrochemical sensor possesses good recoveries between 93.5 % and 98.2 % in real sample analysis, indicating high accuracy in real sample analysis.
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JOURNAL OF MOLECULAR LIQUIDS
·
2018
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IF 4.513
Guo Lin,Shixing Wang,Libo Zhang,Tu Hu,Jinhui Peng,Song Cheng,Likang Fu
In this study, corn bract was modified with thiosemicarbazide (TSC-CCB) and used to selectively adsorb Au(III) from aqueous solutions. FT-IR spectroscopy, Scanning electron microscope and X-ray photoelectron spectroscopy were used to characterize TSC-CCB and investigate the adsorption mechanism. The results suggested that the maximum adsorption amount of Au(III) was 1470.22 mg/g at 25 °C with pH of 6.0. The adsorption isotherm and kinetic data were matched adequately with Langmuir model and pseudo-second-order model, respectively. Meanwhile, TSC-CCB presented a good selectivity for Au(III) from the competitive ions. The ion exchange and chelation between Au(III) and S/N groups played an important role in the enhancement of the adsorption capacity. The regeneration experiments suggested that the TSC-CCB retained high adsorption efficiency after three cycles. TSC-CCB was a promising adsorbent for recovery Au(III) from wastewater in the view of sustainability.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2026
·Vol. 40
·期 5
·e70579
·
IF 4.3
Changqing Xia,Zhengshen Bao,Dehong Xu,Shixing Wang,Weili Li
A robust metal–organic framework (MOF) material, UIO67-PS, was synthesized by grafting sulfonic acid groups onto the UIO67-NH 2 framework. This modification significantly enhances the electronegativity and coordination-site density on the MOF surface, enabling threefold higher Au (III) adsorption capacity (536.4 mg/g at pH 2.0 temperature 25°C and agitation speed 120 rpm) compared to pristine UIO67-NH 2 (168.4 mg/g). The material exhibits exceptional acid resistance and recyclability (91% capacity retention after three cycles). Density functional theory (DFT) calculations and X-ray photoelectron spectroscopy (XPS) analyses reveal that the adsorption mechanism is governed by synergistic electrostatic interactions and chelation, wherein electron-rich oxygen/nitrogen-containing functional groups on the adsorbent surface coordinate with metal ions via covalent bonds to form stable five-membered ring complexes. Kinetic studies confirm rapid adsorption equilibrium (< 240 min), while thermodynamic analysis indicates an endothermic, entropy-driven process. Notably, UIO67-PS demonstrates superior selectivity for Au (III) over competing ions (e.g., Zn 2+ and Cu 2+ ) in simulated e-waste leachates. Achieving removal rates as high as 80% in real metallurgical wastewater highlights its potential for practical application. This work reveals key coordination interactions, including complexation and electrostatic attraction, within a simulated e-waste leachate system containing competing ions such as copper and nickel. These insights advance the design strategies of MOFs for sustainable Au (III) recovery and provide a scalable platform for industrial wastewater treatment, contributing to environmental protection and the sustainable utilization of critical material resources.
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LANGMUIR
·
2022
·
IF 4.331
Xin Kou,Yutian Ma,Congming Pan,Yong Huang,Yulai Duan,Ying Yang
Ionic polymers have been proven to be promising adsorbents in recovering Au(III) due to their advantages of simple synthesis and high adsorption efficiency. However, the unclarity of the relationship between the adsorption ability of ionic polymers and their cationic structures hinders further optimization of their adsorption performance. This study synthesized a series of ionic polymers with pyridinium, imidazolium, piperidinium, pyrrolidinium, and triethylammonium cations to discover the effects of the cationic structure on their adsorption properties. Experimental results show that the existence of anion−π interaction between aromatic cations and [AuCl4]− makes the aromatic cations–anion interaction stronger, which does not enhance the adsorption performance of the aromatic-based ionic polymer. This is due to the charge delocalization in the aromatic ring, resulting in a lower electrostatic potential (ESP) of aromatic cations than that of aliphatic cations with a localized charge. The higher the ESP of cations, the better the adsorption performance of the corresponding ionic polymer. This study serves as a deep understanding of the cationic structure–adsorptive performance relationship of the ionic polymer at the molecular level and further provides a theoretical guidance to optimize the adsorption performance of ionic polymers.
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PubMed
高影响因子
Journal of Environmental Sciences
·
2021
·
IF 5.565
Wen Zhou,Jiale Deng,Zhen Qin,Ruihua Huang,Yi Wang,Shanshan Tong
Toxic heavy metal ions, valuable noble metal ions and organic dyes are significant concerns in wastewater treatment. In this work, MoO 3 nanobelts (MoO 3 NBs) prepared by solvothermal method and MoS 2 nanoarrays (MoS 2 NAs) constructed using MoO 3 NBs precursor were proposed to effectively remove heavy/noble metal ions and organic dyes, such as Pb (II) , Au (III) and Methylene Blue (MB). The two adsorbents exhibited the excellent adsorption capacity towards Pb (II) , Au (III) and MB. The maximum removal capacity of Pb (II) and MB on MoO 3 NBs was 684.93 mg/g and 1408 mg/g, respectively, whereas that of Au (III) and MB on MoS 2 NAs was 1280.2 mg/g and 768 mg/g, respectively. Furthermore, the thermodynamic parameters were calculated from the temperature-dependent curves, suggesting that the removal of Pb (II) and Au (III) on both adsorbents was spontaneous and endothermic. The new adsorbents introduced here were high adsorption activity, ease of fabrication, high scalability, good chemical stability, great repeatability and abundant and cheap supply, which were highly attractive for wastewater treatment.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
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IF 5.4
Xinglu Jiang,Yiwu. Qin,Jun Zhou,Wenjin Chen,Beibei Xie,Hailun Zhou,Kangjing Li,Chunyun Liang,Cong Liu,Ao Long,Shufang Zhuo,Yigeng Liu,Fengyuan Zhou
As exposed to heavy metals, they can bind to biomacromolecules and damage these molecular structures, thereby seriously threatening human's health，for example. Hence, to study the mechanism of interaction between heavy metals and biomacromolecules plays an important role in protecting human health from heavy metal hazards. Here, ssDNA and E. coli lysates were severed as biomacromolecules to analyze their molecular structure changes as exposed to gold (Au) ion and other heavy metal ions, such as Pb 2 + , Cd 2+ , Cr 2+ and Hg 2+ . Gold nanoparticles coated by E. coli lysates (ECL-Au NPs) have been produced in the process of reducing the toxicity of Au(III) by E. coli lysates. As simultaneously exposed to heavy metal ions and sunlight, Au(III) ion can be generated from ECL-Au NPs to rapidly cleave DNA through cycling between Au(0) and Au(III). Meanwhile, the electron transfers also occur in the biomacromolecules from E. coli lysates, and it must cause their structure destruction as well. In conclusion, as exposed to multiple heavy metals, sunlight can enhance the synergetic damage of biomacromolecules by heavy metals. This study provides not only a new tool for DNA cleavage, but also a new mechanism of DNA and proteins damage caused by heavy metal pollution.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junkang Guo,Xiaohu Fan,Jiayuan Wang,Shenghui Yu,Minwang Laipan,Xinhao Ren,Chao Zhang,Lei Zhang,Yongtao Li
The design and synthesis of efficient adsorbents for recovery of precious metal from secondary resources are of great environmental and economic significance. In present study, an efficient and redox-active adsorbent (UiO-66-BTU) was fabricated by modifying Zr-MOF (Zirconium-based Metal Organic Framework) with bisthiourea for gold recovery in aqueous solution. It is indicated that Au(III) adsorbing onto UiO-66-BTU is an irreversible, favorable chemisorption process conformed to D-R model and pseudo-second-order model. The UiO-66-BTU showed significant adsorption ability (680.20 mg/g at pH 2.0) and high selectivity towards Au(III) in presence of various mixed ions in actual wastewater, which were mainly attributed to the Lewis soft–soft interaction, ion-exchange/electrostatic interactions, and redox reaction between Au(III) and S-containing functional groups. Notably, we demonstrated that the reduction of Au(III) to metallic gold as a dominant recovery mechanism involving the in situ confined nucleation, fusion and growth of AuNPs to branched Au precipitation, with Au(0) accounted for approximately 80% for the recycling products. Furthermore, the UiO-66-BTU membrane achieved similar high adsorption capacity and the membrane surface remains active to efficiently recovered metallic particles with an excellent repeatability at eight cycles of adsorption. The reduced Au particles formed isolated clusters with bigger size and regular hexagonal shape. Consequently, UiO-66-BTU has great potential for gold recycling in industrial practice.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
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.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yangyang Wang,Shuwen Chen,Ronghao Liu,Lixin Zhang,Wenfeng Xue,Yanzhao Yang
The development of efficient ionic liquids (ILs) for disposable separation and recovery of various precious metals was of great importance, but still faced difficult challenges. A phase change temperature-controlled system composed of IL and HCl solution was developed for the extraction and separation of Au(III), Pd(II) and Pt(IV) from secondary resources. UCST (upper critical solution temperature)-type IL ([1,4,7-TMTA][Tf 2 N]) possessed outstanding selectivity of precious metals and the property of temperature-controlled phase transition. The ability of ILs to form solvated hydrogen bonds was confirmed by quantum-chemical calculation to be correlated with their corresponding UCST. Different experimental parameters were optimized to explore the extraction behavior of IL. It is noteworthy that homogeneous liquid-liquid extraction system (HLLE) constructed by UCST-type IL could significantly enhance the extraction kinetic of Au(III), Pd(II) and Pt(IV) by decreasing phase interface resistance. For Au(III), Pd(II) and Pt(IV), when the system temperatures were higher than 40 °C, 49 °C and 65 °C, the maximum values were 98.5%, 98.3% and 93.2% at the highest efficiency. In addition, the extraction mechanism of anion exchange was revealed by UV–vis, IR, NMR and LC-MS spectrometry. At last, Au(III), Pd(II) and Pt(IV) could be selectively separated from multi-metal solutions where impurity ions coexist by K 2 C 2 O 4 , NH 3 ·H 2 O and CS(NH 2 ) 2 /HCl, respectively. After 5 cycles, the extraction performance of [1,4,7-TMTA][Tf 2 N] maintained. In summary, this paper overcame the obstacle of slow kinetics of solvent extraction technology, and pointed out a way for polymetallic co-extraction and separation in HLLE system.
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HYDROMETALLURGY
·
2022
·
IF 4.217
Yangyang Wang,Ronghao Liu,Xiaoxia Liu,Ping Lv,Lixin Zhang,Yanzhao Yang
For sustainable development and environmental protection, recovery of critical metals, especially for gold, from secondary resources, has recently attracted substantial attention. In this work, two novel temperature-responsive ionic liquids (TRILs), [EA-TMEDA][Tf 2 N] 2 and [EA-TMHDA][Tf 2 N] 2 , were designed and firstly synthesized for Au(III) extraction from hydrochloric acid medium. The optimum extraction conditions for Au(III) were selected by optimizing the amount of extractant, acidity and other factors. In optimal conditions, TRILs showed excellent extraction performance for Au(III), which could reach 97.5% with [EA-TMEDA][Tf 2 N] 2 and 91% with [EA-TMHDA][Tf 2 N] 2 , respectively. They also exhibited great selectivity in multi-metal solution such as Cu(II), Mn(II) and Co(II). The thermomorphic behaviors were investigated around the upper critical solution temperature (UCST) by the characterization methods of variable-temperature 1 H NMR and dynamic light scattering (DLS). The extraction mechanism was also determined as anion exchange mechanism through the maximum metal loading experiments, UV–vis, FT-IR and 13 C NMR characterization. In addition, Au(III) could be almost completely stripped by C 2 H 2 O 4 from the loaded IL phase and there was no significant reduction in efficiency after 5 cycles. Hence, the new TRILs offered outstanding extraction performance for the greener and sustainable extraction of Au(III), and will have broad application prospects in the extraction field.
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