Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120944
·
IF 7.2
Yong Xiang,Li Xu,Guoji Liu
Efficient recovery of Au(III) from electronic and industrial waste streams is of both economic and environmental importance. Herein, a pore-regulation strategy was developed to construct hierarchically porous NH 2 -MIL-101(Fe 1-x Cu x ). By employing 2-aminoterephthalic acid to coordinate simultaneously with Fe 3 + and Cu 2+ , the unstable Cu–O bonds were selectively removed through a mild acid-soaking treatment, thereby generating enlarged channels and hierarchical micro–mesoporous structures. The optimized framework achieved an Au(III) adsorption capacity of 944 mg g −1 , which was ∼30.7 % higher than that of unmodified NH 2 -MIL-101. Mechanistic studies demonstrated that the hierarchical pore architecture not only facilitated mass transfer but also enhanced accessibility of active sites, synergistically contributing to the superior adsorption performance. This work highlights that rational pore-channel engineering around adsorption sites can substantially boost the recovery efficiency of reducible precious metals, offering a novel design paradigm for advanced MOF-based adsorbents.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2018
·
IF 1.2
Zeyang Xiang,Shubin Wang,Yanzhao Yang,Xia Xin
The effect of spacer lengths of imidazolium gemini surfactant [C14-n-C14im]Br2 (n = 2, 4, 6) on the equilibrium, thermodynamics and kinetics of Au(III) extraction from hydrochloric acid medium were investigated in this article. The thermodynamic parameters, including the changes in enthalpy (ΔH*), entropy (ΔS*) and Gibbs free energy (ΔG*) were determined. The values of ΔH* demonstrated that the extraction of Au(III) by [C14-n-C14im]Br2 was endothermic at first and exothermic at last. The kinetics study found that extraction rate became faster when the spacer lengths were increased. Moreover, kinetics results demonstrated that the diffusion is the controlling step, and the mass transfer coefficients of Au(III) in the investigated systems indicated that the resistance of mass transfer was smaller when the spacer lengths was longer. The studies of interfacial tension further confirmed the better extractability of [C14-n-C14im]Br2 with longer spacer lengths. Our results reveal efficient and sustainable gold separation.
✓ 已验证
DOI
高影响因子
HYDROMETALLURGY
·
2018
·
IF 3.3
Zhike Wang,Boshuang Zhang,Cunling Ye,Lingyun Chen
Metal organic frameworks (MOFs) have diverse applications in adsorption/separation fields. However, little is known about MOFs as adsorbents for the adsorption of Au(III) from aqueous solutions. In this work, a highly porous MOFs, ZIF-8, was modified by thiourea (TU) via coordination-based post-synthetic modification strategy. Compared with pristine ZIF-8, the TU functionalized ZIF-8, TU*ZIF-8, exhibited a remarkable Au(III) adsorption ability with a saturation adsorption capacity of 4262.8 mg/g although its surface area and pore volume decreased with TU loading. Interestingly, the adsorption efficiency of Au(III) was >99% with a broad Au(III) concentration range of 50–400 mg/L using only 20 mg TU*ZIF-8. Meanwhile, TU*ZIF-8 showed an encouraging selectivity for Au(III) in the presence of some metal ions such as Cu(II), Cr(VI), Pb(II), Cd(II), Mn(II), Mg(II), and Co(II). The improved adsorption of Au(III) on TU*ZIF-8 is explained by the synergistic effect of electrostatic interaction and coordination interaction. Particularly, the coordination interaction between Au(III) and TU of TU*ZIF-8 plays a major role in the Au(III) adsorption process of TU*ZIF-8. This work suggests a potential application of functionalized MOFs for the efficient recovery of gold from aqueous solutions.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 83
·期 2
·467-477
·
IF 1.575
Fu Likang,Zhang Libo,Wang Shixing,Zhang Gengwei,Peng Jinhui
A new adsorbent was synthesized via functionalizing nano-silica with 4-(aminomethyl) pyridine for selective recovery of gold. The adsorbent was characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and transmission electron microscopy, and BET (surface area and porosimetry analyzer). The results indicated that the maximum adsorption capacity of Au(III) was 55.5 mg/g at pH 4.0 and room temperature. The adsorption reaction was fairly rapid and reached equilibrium within 30 min. The adsorption processes of Au(III) were fitted well to the Langmuir isotherm model and adsorption kinetics of Au(III) followed the pseudo-second-order rate equation. The adsorption mechanism lies on the chelation and ion exchange between gold ions and amines/hydroxyl groups. The adsorbent had good reusability after five cycles. Moreover, 4-(aminomethyl) pyridine-Silica nanoparticles has a good selectivity in the adsorption of Au(III) from the coexisting ions. Therefore, 4-(aminomethyl) pyridine functionalized nano-silica could be of great potential as new adsorbent for the selective recovery of Au(III) from industrial effluents and waste e-products. Graphical
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2022
·
IF 4.119
Zhongmin Feng,Chuanyu Zhu,Yupu Meng,Zhuqing Wang
A non-solvent-induced phase separation method was used to synthesize easily separable membrane materials from polyether sulfone and polym-phenylenediamine to achieve selective recovery of Au from e-waste solutions. The optimum conditions, adsorption capacity, and selectivity of the polyether sulfone/polym-phenylenediamine membrane were investigated by adsorption experiments. The maximum adsorption capacity of the PES/PmPD membrane to Au(III) within 4 h at 30 °C with optimal pH of 1 was 582.75 mg/g. The adsorption process follows the quasi-second-order adsorption isotherm. The adsorption agent was characterized by XPS and XRD to understand the recovery mechanism of Au(III) by PES/PmPD membrane. In addition, PES/PmPD membranes were single-selective for Au(III) in a variety of natural water bodies and highly acidic conditions. Therefore, the thin membrane material has great potential for recycling Au(III) from waste e-waste.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Lun Wang,Keming Wang,Ruihua Huang,Zhen Qin,Yingchun Su,Shanshan Tong
In the past few years, two-dimensional (2D) nanomaterials have emerged great potential for the removal of valuable metals and the capture of polluted-heavy metals. Herein, hierarchically flower-like microcrystals with 2D WS 2 nanosheets (F-WS 2 MCs) were prepared by one-pot hydrothermal synthesis strategy and its adsorption performances for precious metals were systematically assessed. The excellent adsorption efficiencies of ∼86.8%, ∼27.6%, and ∼94.1% towards Ag (I), Pd (II), and Au (III) respectively were achieved within 120 min, and the adsorption curves were in good agreement with a pseudo-second-order kinetic model showing a fast uptake rate at the optimum pH values (1.30 for Au (III), 1.43 for Ag (I), and 3.20 for Pd (II)). The adsorption isotherm followed well in the Langmuir model with the maximum removal capacities ( q max ) of 186.2 mg g −1 for Ag (I), 67.29 mg g −1 for Pd (II), and 1340.6 mg g −1 for Au (III), respectively. Furthermore, for recycling purposes, the relevant desorption solution was investigated with different ratios of monobasic acid and thiourea , suggesting the best desorption efficiency of 93.03%, 88.08%, and 85.34% for Ag (I), Pd (II), and Au (III), respectively. By characterizing the crystalline phase, and micromorphology element mapping of F-WS 2 MCs before and after adsorption, the strong affinity and significant adsorption–reduction were indicated to dominate the adsorption process. Therefore, this work broadens the application range of WS 2 microcrystals, providing an alternative material for capturing precious metals and wastewater treatment applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yuting Hu,Shixing Wang,Libo Zhang
A novel Cu-based bisligand metal organic framework adsorbent (Cu-BMOF) was prepared by hydrothermal method using 5-methyl-2-thiophenecarboxylic acid and 4,4-azopyridine as organic linkers. The samples were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and zeta potentiometry (Zeta). To investigate the adsorption performance of Cu-BMOF for Au(III), the effects of pH, temperature, adsorption time and initial concentration were explored. At 298 K and pH = 2, the maximum adsorption capacity of Cu-BMOF for Au(III) is 933 mg/g. Langmuir and quasi-second-order models can describe the adsorption process well. Au(III) adsorption on Cu-BMOF is a monolayer and irreversible chemisorption process. Thermodynamic studies show that the adsorption process of gold on Cu-BMOF is exothermic and spontaneous. The response surface method (RSM) was applied to optimize the adsorption efficiency. Under optimal conditions, the adsorption rate was 99.64%. X-ray photoelectron spectroscopy (XPS) results show that the adsorption mechanism of Cu-BMOF is the binding between Au (III) and the N, and S functional groups of Cu-BMOF. In addition, the affinity of Cu-BMOF for Au(III) is superior compared with that of coexisting ions in water. Cu-BMOF have promising applications in environmental protection and water purification .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fenglei Liu,Guilong Peng,Tong Li,Gang Yu,Shubo Deng
A novel bio-adsorbent (DACS-TA) was synthesized via a facile crosslinking reaction between tannin acid (TA) and dialdehyde corn starch (DACS), and the adsorption behavior of Au(III) from aqueous solution onto the DACS-TA was evaluated in batch adsorption experiments. Fourier Transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies were used to verify the successful crosslinking reaction, and the surface functional groups and the thermal stability of the prepared DACS-TA were also characterized. Adsorption results showed that the DACS-TA exhibited high adsorption capacity and selectivity towards Au(III), and the maximum adsorption capacity could reach up to 298.5 mg/g at pH 2.0 according to the Langmuir fitting. The adsorption isotherms of Au(III) on the DACS-TA were described well by the Langmuir model, indicating that the monolayer adsorption of Au(III) possibly occurred on the adsorbent surfaces. The kinetic data were fitted better by the Pseudo-second-order kinetic equation in comparison with the Pseudo-first-order and Intraparticle diffusion equations. Based on the SEM, XRD and XPS analysis, the adsorption-reduction mechanism of Au(III) on the DACS-TA was proposed. Namely, Au(III) was first adsorbed on the adsorbent and then was reduced to Au(0) while the phenolic group of TA was oxidized to carbonyl groups.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Chao Xiong,Shixing Wang,Libo Zhang
A new adsorbing material (PE-PGMA) was prepared by grafting trimethyl phosphate onto poly(glycidyl methacrylate), and it was applied to selectively adsorb gold ions from an aqueous solution. FT-IR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy), XPS (X-ray photoelectron spectroscopy) and zeta potential analysis were employed to characterize the prepared adsorbent. Three kinetic and isothermic equations were employed to investigate the selective adsorbing mechanism of Au(III) from an aqueous solution. The adsorbent had the highest adsorption rate in the pH range from 2 to 9, thus suggesting that PE-PGMA had a wide acid-base tolerance. The adsorbing equilibrium is attained in 10 min and the maximum adsorption capacity is 601.34 mg/g. The pseudo-second-order and Langmuir models well described the kinetics and isotherms of the adsorption process , respectively. The results certified that the adsorbing process was monolayer sorption and the rate-limiting step was chemical adsorption . After seven cycles of reusability experiments, the adsorbing rate of gold ions decreased from 99.06% to 96.72%, thus proving that the adsorbent has good reusability. Moreover, the adsorbent presented good selectivity for gold ions from the coexisting ions (Cu 2+ , Ni 2+ , Co 2+ , Ge 4+ and Pb 2+ ). The chelation interaction between phosphate groups and Au(III) played a significant role in the selective adsorption and higher uptake capacity. Furthermore, the column adsorption and the recovery experiment of gold from laboratory wastewater demonstrated that the PE-PGMA has good potential to recover gold.
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
·
2024
·
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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
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.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 49
·期 2
·504-510
·
IF 4.052
Hongmei Su,Qi Wang,Ning Wang,Yanzhao Yang
The first gemini-type benzimidazole ionic liquid ([C4-6-C4BIm]Br2) with two sites of action was synthesized and applied for gold extraction. The effects of [C4-6-C4BIm]Br2 concentration, initial gold(III) concentration, acidity, and the loading capacity of [C4-6-C4BIm]Br2 were examined in detail. It was found that [C4-6-C4BIm]Br2 has excellent extraction ability for obtaining high purity gold. The anion exchange mechanism between [C4-6-C4BIm]Br2 and Au(III) was proved by Job's method and 1H NMR and FTIR spectroscopy. Quantum chemical calculations were carried out to prove the mechanism theoretically. The extraction equilibrium process was modeled using Langmuir and Freundlich isotherms. Thermodynamic parameters ΔH, ΔG and ΔS indicated that the extraction process was exothermic and spontaneous. The pseudo-second-order kinetic model well fitted the experimental data (R = 0.99). In addition, [C4-6-C4BIm]Br2 has high selectivity for Au(III) compared to other base metals. In summary, [C4-6-C4BIm]Br2 has great application prospects in industry due to its excellent characteristics such as low cost, easy availability, and high extraction capacity.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）