DALTON TRANSACTIONS
·
2026
·
IF 3.3
Zhuoran Sun,Yali Ma,Haijun Hu,Xue Zhou,Peng Jiang,Xue Li,Jiyang Li,Yunling Liu,Xiaodong Sun
A tetrazine-functionalized zirconium MOF, UiO-68-TZDC (isostructural with UiO-68-TPDC), is constructed through a one-pot solvothermal synthesis for the selective recovery of Au(III) from acidic chloride media, using UiO-68-TPDC as a tetrazine-free, isostructural counterpart. The obtained crystalline materials possess good thermal stability. UiO-68-TZDC shows a saturated Au(III) uptake of 404.4 mg g−1, which is significantly higher than that of UiO-68-TPDC (114.5 mg g−1), and comparable or superior to many reported N- and S-functionalized Zr-MOFs. The adsorption kinetics follow the pseudo-second-order model with multi-stage intraparticle diffusion, indicating combined control by chemisorption and diffusion. UiO-68-TZDC displays pronounced selectivity for Au(III) over Fe(III) and Cu(II) and retains more than 70% of its initial capacity after several adsorption–desorption cycles. Structural and spectroscopic analyses reveal the formation of crystalline Au0 domains and surface Au(III) and Au(I) species, directly indicating a partial reduction process driven by the electron-rich tetrazine linker, as evidenced by significant shifts in the electronic states of the nitrogen sites. These results support a cooperative “preconcentration-coordination-reduction” mechanism and demonstrate that tetrazine linker engineering in robust UiO-68 frameworks is an effective strategy for developing high-performance adsorbents for Au(III) recovery from acidic gold-containing waste streams.
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ACS ES&T Water
·
2023
·
IF 5.3
Lijuan Wang,Jiawei Li,Gansheng Zhong,Jiangpeng Li,Xiao Lu,Siqing Wang,Yuanyuan Tang
To face the current critical challenges of gold recovery and beneficial utilization of solid waste, this study synthesized diatom biochar from the anoxic pyrolysis of diatoms and proved the superiority of the diatom biochar as a novel adsorbent for Au(III) in both synthetic and real electroplating wastewaters. The diatom biochar was found to have a high adsorption capacity of 443.0 mg/g and a superior recovery efficiency of up to 92.1%. The Au(III) adsorption kinetics followed the pseudo-second-order and intraparticle diffusion models. Electrostatic attraction and reduction were detected as the major adsorption mechanisms. An exceptional selectivity was also observed for the diatom biochar toward Au(III) with other coexisting heavy metals. Even in the presence of CN– in the solution, the diatom biochar still exhibited superiority in Au(III) adsorption. Owing to its high affinity to Au(III), the diatom biochar was successfully applied in real electroplating wastewater containing trace Au(III), with an adsorption efficiency as high as 96.7%. These findings sufficiently demonstrate the excellent performance and economic feasibility of diatoms for Au(III) recovery from electroplating wastewater, which also promoted solid waste minimization of diatom biorefineries.
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ELECTROCHIMICA ACTA
·
2019
·
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.
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RSC Advances
·
2017
·Vol. 7
·期 87
·55215-55223
·
IF 3.108
Gengwei Zhang,Yang Zhou,Zhao Ding,Likang Fu,Shixing Wang
A new adsorbent thiosemicarbazide/nanosilica composite was synthesized via a facile two-step reaction, including the functionalization of silica nanoparticles via amino groups, and crosslinking the thiosemicarbazide with glutaraldehyde onto the amino functionalized silica nanoparticles. The adsorption capability of the adsorbent for Au(III) ions was investigated. Fourier transform infrared, X-ray photoelectron spectroscopy and thermogravimetric analysis were used to characterize the adsorbent. Experimental results indicated that nanocomposites exhibited highly selective and efficient adsorption for Au(III). The equilibrium data fitted well with the Langmuir isotherm and the obtained kinetic data obeyed the pseudo-second-order kinetics model. The maximum adsorption capacity was 4.3 mmol g−1 at pH 2. The adsorbent can still keep high adsorption capability after five recycling rounds. The adsorption mechanisms were proposed as the synergistic effect of ionic interaction and chelation.
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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.
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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.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yong Xiang,Dongfang Dai,Wencai Bai,Li Xu,Guoji Liu
Current adsorbents for Au(III) recovery suffer from high costs, low adsorption capacity, recycling difficulty, as well as small-scale applications, making most of them have no commercialization potential. We report a complex adsorbent SA-TRF in this work. The aerogel made of sodium alginate (SA) serves as the carrier, and TRF resin (a resin composed of thiourea, resorcinol and formaldehyde) is used as the functional element. The thin-layered SA aerogel is evenly embedded with functionalized micron adsorbent (TRF) particles. Owing to the multiple functional groups of TRF, SA-TRF exhibited a high adsorption capacity. TRF was capable of making complete contact with Au (III) in the solution owing to the thin-layered SA aerogel. The SA aerogel's macrostructure makes it simple to collect SA-TRF in solution. The repeating unit of TRF's C S and NH functional groups were identified as being responsible for Au(III) binding, with its sulfhydryl functional group performing as the strongest binding site. The conveniently synthesized SA-TRF outperformed most other adsorbents and demonstrated significant adsorption capacity for Au (III) up to 600.2 mg/g in 70 mg/L Au-spiked water (corresponding removal efficiency is 85.7 %), which makes it particularly promising for industrial applications.
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JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Jinshui Liu,Bin Wang,Meijiao Xu,Lizhen Wang,Zihan Zhou
Polyethyleneimine-capped Cu nanoclusters (PEI-CuNCs) with a mean diameter of 2.5 nm and that emitted blue light at 485 nm were synthesized. The fluorescence of PEI-CuNCs was strongly quenched when Au(III) ions were present. Because of this specific response, a PEI-CuNC-based fluorescent turn-off sensor was developed. Under optimum conditions, a good linear relationship (R 2 =0.993) was found between the relative fluorescence intensity ( F 0 / F ) and the Au(III) ion concentration between 0.5 and 15 µM. The detection limit for Au(III) ions was 0.06 µM. The quenching mechanism was assessed by performing X-ray photoelectron spectroscopy spectra studies. The fluorescence quenching was ascribed to photo-induced electron transfer from the PEI-CuNCs to the AuCl 4 − occur. Using The method described is a new way of quantifying Au(III) ions.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Lingyuan Chen,Jiali Tang,Xinyue Zhang,Shixing Wang,Zhaogang Ren
A novel benzothiazole modified chitosan ( BCS ) with excellent Au(III) adsorption performance and selectivity was prepared as adsorbents. The structure and morphology of the adsorbents were characterized by FTIR, SEM, XRD and XPS. The adsorption property of the adsorbents for Au(III) were investigated under different reaction time, initial concentration of Au(III), temperature, pH and coexisting ions. The maximum adsorption capacity of BCS for Au(III) was 1072.22 mg/g at 298 K and optimal pH = 4, which was better than that of other adsorbents reported in literature. The adsorption kinetics and isotherm models fit the pseudo-second-order and Langmuir equations. This shows that the adsorption process of Au(III) is a monolayer chemical adsorption. The adsorption process can proceed spontaneously and belong to the endothermic reaction according to the thermodynamic results. The excellent adsorption performance is mainly attributed to the ion exchange and chelation of the nitrogen, sulfur and oxygen groups on the adsorbent with gold ions. Significantly, BCS has excellent selectivity toward Au(III) and remarkable recycle performance. With the high adsorption capacity, excellent selectivity and outstanding reusability, the BCS adsorbent could be a promising candidate to adsorb Au(III) from wastewater.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xiangmeng Chen,Xingchuan Yang,Yong Xiang,Li Xu,Guoji Liu
Humic acid-derived resin (named “RFH”) is employed for efficiently recovering gold from acidic aqueous solutions. The selectivity and effects of pH, contact time, initial concentration, and temperature on Au(III) adsorption by RFH have been studied. The RFH resin exhibited remarkable selectivity for gold ions over other metal ions and very high adsorption capacity for Au(III), up to 920 mg·g–1. The gold adsorption nicely conforms to the Freundlich isotherm model, and the removal of Au(III) from the aqueous solution by RFH resin follows pseudo-second-order kinetics. The RFH resin before and after adsorption was characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), which provided evidence for gold adsorption mechanism of RFH. The results showed that Au(III) was adsorbed on RFH, then reduced to elemental gold, and deposited on the adsorbent in the form of the element gold. We summarize the process as an adsorption–reduction–deposition mechanism. This paper provide a new way for gold recovery from aqueous acidic solutions.
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Green Energy & Environment
·
2020
·
IF 6.395
Jiadi Liu,Minghuan Liu,Shaoyun Chen,Bingqing Wang,Jin Chen,Da-Peng Yang,Shangzhou Zhang,Wenxiao Du
Developing an environmental-friendly and highly active catalyst in transesterification for biodiesel production is of great importance for a more economic biodisel process. Herein, we reported that waste eggshells were used to adsorb Au(III) in water and convert the Au(III)-polluted eggshells into the functional nanocatalyst-CaO/Au for the transesterification reaction between soybean oil and methanol to the preparation of biodiesel. By coupling of CaO and Au nanoparticles, CaO/Au nanoparticles showed superior catalytic activity for the transesterification reaction between soybean oil and methanol. An optimum performance was observed over CaO/Au nanocomposites in a methanol-oil molar ratio at 12 : 1 with catalyst content of 1.0 wt% at 70 °C for 3 h. Besides, the catalytic activity of CaO/Au nanocatalyst was almost unchanged after recycling for 5 times and the yield of biodiesel still kept at 88.9%. The proof-of concept study provided us a sustainable method for utilization of waste eggshells to remedy the metal ions-polluted wastewater and the synthesis of functional nanocomposite for biodiesel production, show great potential application of waste eggshell in adsorption and catalytic reactions.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Chaopeng Liu,Zhongxian Song,Chaohai Wang,Ping Lan,Yilong Yang,Xu Yan,Haiyan Kang,Mengxia Ma,Deming Gu,Yuzhong Liu,Xiaole Yan,Yanli Mao
The disposal of gold-containing wastewater not only causes a waste of resources but also triggers major health issues. Herein, Cu 2 O functionalized ZIF-8 (CZF8-MW) was successfully synthesized by microwave-assisted method to adsorb gold (Au) ions in the water environment. The performance and mechanism of Au(III) adsorbed on CZF8-MW were systematically studied. The results reveal that CZF8-MW exhibits excellent adsorption capacity and a stronger affinity for Au(III) compared with pure Cu 2 O. The boosted adsorption mechanism of Au(III) can be ascribed to the electrostatic attraction between CZF8-MW and Au(III) in acidic conditions (pH = 3.0) and the reduction of Au(III) to Au(I) and Au(0) by Cu 2 O, prompting that the adsorption capacity of CZF8-MW is 1300 mg g −1 at 318 K. Besides, CZF8-MW holds superior selectivity for Au(III) in the presence of competing ions and shows outstanding reusability after five cycles. These results indicate that CZF8-MW possesses a great potential application for the adsorption of Au(III) from wastewater.
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