CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Haiyan Kang,Yulong Luo,Chaopeng Liu,Zhongxian Song,Chaohai Wang,Xu Yan,Mengxia Ma,Xiaole Yan,Deming Gu,Yanli Mao
The recovery of Au(III) by adsorption has attracted extensive attention since it promotes solving the problems of environmental pollution and resource waste. Herein, we prepared the functionalized MCM-41 (MCM-NH 2 -OH) and explored the synergistic adsorption effects for Au(III). The adsorption capacity of MCM-NH 2 -OH reached 1664.9 mg·g −1 , which was 15.98 times and 2.99 times higher than MCM-NH 2 (104.2 mg·g −1 ) and MCM-OH (556.0 mg·g −1 ), respectively. The fitting kinetics experiments demonstrated that Au(III) adsorption by MCM-NH 2 -OH was conformed to the pseudo-second-order kinetic model. The adsorption rate of MCM-NH 2 -OH (2.62 × 10 -2 g·mg −1 ·min −1 ) was 346.1 times higher than MCM-NH 2 (7.57 × 10 -5 g·mg −1 ·min −1 ). The adsorption mechanism and the role of –NH 2 and –OH groups were investigated by XPS, XRD, and FTIR. More Au(III) can be adsorbed on –NH 2 groups by electrostatic attraction and chelation that provided electron acceptor for –OH groups, which further enhanced the reduction of Au(III) to Au(0). Further, MCM-NH 2 -OH exhibited superior selectivity and reusability for Au(III). Therefore, the synergy between –NH 2 and –OH groups is suitable for efficient adsorption-recover of gold applied in actual wastewater.
研究领域:
环境科学
·
材料科学
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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.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Yumei Chen,Chunhui Xie,Yang You,Tonghui Xu,Yunqi Li,Jili Yuan,Haibo Xie,Yuanlong Guo
The demand for the recovery of precious metals has become increasingly prominent due to their scarcity and wide application, while the facile preparation of sustainable absorption and separation materials via molecular engineering still face great challenge by using renewable polymer resources. Herein, a water-soluble cellulose levulinate ester (CLE) with ketocarbonyl groups was utilized as 3D network scaffold to fabricate a cellulose-based aerogel adsorbent (CLE@PEI) by introducing polyethyleneimine (PEI) with multiple amine groups. The abundant functional groups and porous architecture allowed CLE@PEI to efficiently capture Au(III), Pt(IV) and Pd(II). The maximum adsorption capacity of CLE@50PEI reached a staggering 1752.0 mg/g for Au(III) at 298 K which was superior than that of Pt(IV) (1420.5 mg/g) and Pd(II) (495.1 mg/g). The adsorption process followed pseudo-second-order kinetic model and Langmuir isotherm behavior, respectively. Additionally, the positively charged CLE@50PEI exhibited excellent selectivity for precious metals in multi-metal mixtures. The outstanding adsorption performance of the CLE@50PEI may be due to the new “adsorption-in situ reduction” mechanism, in which the process primarily involved the ion exchange coupled with electrostatic interaction and complexation, and the in situ reduction of absorbed Au(III) to single crystalline flakes. Moreover, quantitative desorption of the CLE@50PEI-loaded metals was achieved in acidic thiourea solution.
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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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2020
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IF 2.929
Shaoxia Wang,Meirong Shen,Jianfei Qu,Xuming Zhuang,Shou-Qing Ni,Xuran Wu
In this study, mercapto-modified graphene/multi-walled carbon nanotube aerogels were facilely constructed by using L-cysteine as a cross-linking agent and modifier. The effective adsorption behaviors of Au(III) from environmental samples by the aerogels were investigated. The aerogels were characterized, and many influencing factors, such as pH value, adsorbent dosage, and contact time, were optimized. The kinetic data followed the pseudo-second-order model, and the equilibrium data fitted well to the Freundlich isotherm model. The maximum adsorption capacity for Au(III) reached approximately 47 mg g −1 . Moreover, the Au(III) could be desorbed with 1 M HCl containing 4% thiourea and detected by inductively coupled plasma atomic emission spectroscopy. Finally, the aerogels were used in lake water, seawater, and soil samples for Au(III) adsorption with recovery rates from 87.0% to 102.8%. The results indicate that the developed aerogel is an excellent adsorbent for removing Au(III) from samples and has significant application prospects in environmental research.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1313-1319
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IF 3.069
Xu Yang,Kunhao Yang,Li Wu,Jingkui Yang,Yujian He
Magnetic nanoparticles containing multiform heteroatoms on their surface have great potential for metal-ion recovery with a high throughput. In this study, a novel adsorbent (Fe3O4@CPTES@PEG) was developed to adsorb Au(III) from aqueous solution, which was synthesized by functionalizing Fe3O4 magnetic nanoparticles with poly(ethylene glycol) via a simple two-step reaction. Various techniques including Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the adsorbent, demonstrating that poly(ethylene glycol) was successfully grafted onto the Fe3O4 magnetic nanoparticles. Batch experiments were performed to investigate the effects of the initial concentration of Au(III), contact time and coexisting ions on the absorption of Au(III) from an aqueous solution at pH = 1.0. Simultaneously, the adsorption process was well-fitted with the Langmuir and pseudo-second-order models. The as-synthesized core–shell structured Fe3O4@CPTES@PEG showed a high performance towards Au(III) adsorption with the maximum adsorption capacity of about 83 mg g−1. Significantly, the material exhibited highly selective adsorption toward Au(III) in the presence of coexisting ions (Fe(III), Mn(II), Pb(II), Cd(II), Cu(II), Cr(III), Al(III), Mg(II), Zn(II) and Au(III)). Also, the material could be regenerated using ferrous sulfate, and exhibited excellent reutilization for at least three times without significant loss in its adsorption capacity after a simple post-treatment. Therefore, the proposed method shows enormous potential for practical applications in the selective separation and enrichment of Au(III) from aqueous solution at pH = 1.0.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 8
·1826
·
IF 4.6
Na Zhou,Xueli Wu,Shaoxia Wang,Jianfei Qu,Yang Tan,Chuanlei Luan,Xiuli Yin,Xuran Wu,Xuming Zhuang
In this work, amino-modified ZIF-90 (NH2-ZIF-90) was prepared by using butylamine as a modifier, and its effectiveness in adsorbing Au(III) from environmental samples was investigated. The morphology and structure of NH2-ZIF-90 were analyzed via SEM, XRD, FT-IR, and XPS. Optimal adsorption occurred after 12 h of shaking in a pH = 5 aqueous solution with 2 mg mL−1NH2-ZIF-90. The adsorption kinetics conformed to a pseudo-second-order model, and the equilibrium data fit the Freundlich isotherm model well. Finally, NH2-ZIF-90 was successfully used in lake water and tap water samples for Au(III) adsorption, with recovery rates ranging from 81.0% to 93.3%. This study presents a novel approach for addressing Au(III) adsorption challenges.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yong Xiang,Chang-Yuan Cheng,Meng-Hao Liu,Wen-Cai Bai,Zhou-Xuan Zang,Li Xu,Yi Yu,Guo-Ji Liu
The design of an efficient adsorbent for Au(III) has remained a challenging research focus, as the adsorbent needs to overcome competition from other ions while simultaneously addressing pore blockage caused by the reduction of Au(III) to elemental gold. In this study, we report the synthesis of a hierarchically porous metal–organic frameworks (MOFs) with ultra-large pores (300 nm) using the “MOF in MOF” method. This material facilitates enhanced adsorption kinetics by increasing the rate of gold ion adsorption and effectively prevents pore blockage resulting from Au(III) reduction, enabling access to the majority of adsorption sites. Batch experiments were conducted, and various complex water mixtures, including freshwater, simulated electronic waste solution, and gold ore leachate, were tested to demonstrate the rapid extraction of trace amounts of gold by the developed adsorbent. Remarkably, without additional functionalization, the adsorbent solely based on its pore advantage achieved a gold adsorption capacity of 1184 mg/g and reached 80 % adsorption within just 5 min (C0 = 100 mg/L, V/m = 2 L/g). Furthermore, the gold recovered from the leachate of gold ore exhibited a purity of 23.8 K (99.2 % purity).
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 11
·1-10
·
IF 2.8
Peng Lin-Ling,Zhou Wei-Fang,Chen Min,Li Li-Jun,Liu Yu,Zhou Cong-Shan,Xie Jun,Tang Ke-Wen
A novel disulfide functionalized nitrogen-rich covalent organic polymer (S-COP) directly synthesized by a solvothermal method were characterized by XRD, SEM, FT-IR, N 2 adsorption–desorption and XPS techniques. The as-synthesized polymer shows efficient adsorption performance for Au(III) from aqueous solution. The adsorption equilibrium of the adsorbent could be achieved within 5 h, and the as-synthesized S-COP exhibits an exceedingly high Au(III) uptake capacity of 1506 mg·g −1 . Furthermore, S-COP has satisfactory selectivity and reusability, which is a highlight of adsorption materials.
研究领域:
材料科学
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环境化学
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分析化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）