Mechanism of selective gold adsorption on ion-imprinted chitosan resin modified by thiourea

Guo, Junkang; Fan, Xiaohu; Li, Yanping; Yu, Shenghui; Zhang, Yi; Wang, Lei; Ren, Xueguang

doi:10.1016/j.jhazmat.2021.125617

Cited by 64 publications

(17 citation statements)

References 43 publications

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“…And to promote the biological application, some imprinted photocatalysts were synthesized using a biological hydrogel-based MIP matrix. 36–38 The structures of these hydrogels (calcium alginate, chitosan, and bacterial cellulose) used in imprinted photocatalysis are summarized in Fig. 4.…”

Section: Fabrication Of Molecularly Imprinted Photocatalystsmentioning

confidence: 99%

Molecularly imprinted photocatalysts: fabrication, application and challenges

et al. 2022

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Section: Fabrication Of Molecularly Imprinted Photocatalystsmentioning

confidence: 99%

Molecularly imprinted photocatalysts: fabrication, application and challenges

et al. 2022

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“…Thiourea-modified chitosan-imprinted resin (IM-TUCS) was tested for gold(III) ion sorption. Protonation of the amino group on the resin at low pH value promoted Au(III) adsorption; O, N, and S in the C-OH, C=S, and C-NH 2 groups contained in the IM-TUCS coordinated with Au(III) ions [11].…”

Section: Introductionmentioning

confidence: 99%

Selective Recovery of Gold from Electronic Waste by New Efficient Type of Sorbent

et al. 2023

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Modular connectors are applied by computer users, and they can be metallic secondary sources containing metals such as gold and copper. Because gold is a micro-component, the solution obtained after the pin digestion contains a low concentration of gold(III) ions, and efficient and selective sorbent should be used for gold(III) ion recovery. The selective removal of small amounts of gold(III) from 0.001–6 M hydrochloric acid solutions using pure and solvent-impregnated macroporous polystyrene crosslinked with divinylbenzene sorbents (Purolite MN 202 and Cyanex 272) is presented. Gold(III) ions were recovered effectively from the chloride solution after the digestion of the modular connector RJ 45 (8P8C) using Purolite MN 202 after the impregnation process. The dependence of the recovery percentage (R%) of gold(III) on the contact time was determined. The highest value of gold(III) ion sorption capacity (259.45 mg·g−1) was obtained in 0.001 M HCl for Purolite MN202 after the Cyanex 272 impregnation. The results can be applied to gold recovery from e-waste. The presented method of gold recovery does not generate nitrogen oxides and does not require the use of cyanides.

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“…By now, various adsorbents, such as active carbon [ 8 ], multiwalled carbon nanotubes [ 9 ], covalent organic frameworks [ 10 ], metal–organic frameworks [ 11 ], nanoparticles [ 12 , 13 ], melanin-based polymers such polydopamine [ 14 , 15 ], natural polymers (cellulose [ 16 , 17 ], and chitosan [ 18 , 19 ]), among others, have been used for waste remediation. Among them, microcrystalline cellulose (MCC) has many advantages, such as sustainability, hydrophilicity, biodegradability, and easy functionalization, which make it very suitable as an adsorbent substrate [ 17 , 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

Selective and Effective Gold Recovery from Printed Circuit Boards and Gold Slag Using Amino-Acid-Functionalized Cellulose Microspheres

Hao

Peng

et al. 2023

Polymers

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The hydrometallurgical recovery of gold from electronic waste and gold slag is a hot research topic. To develop a cost-effective and environmentally friendly adsorbent for gold recovery, four types of amino-acid (arginine, histidine, methionine, and cysteine)-functionalized cellulose microspheres were prepared via a radiation technique. The adsorption performance of the amino acid resins toward Au(III) ions was systematically investigated by batch experiments. The amino acid resins could absorb Au(III) ions at a wide pH range. The adsorption process was followed by the pseudo-second-order model and Langmuir model. The theoretical maximum adsorption capacity was calculated as 396.83 mg/g, 769.23 mg/g, 549.45 mg/g, and 636.94 mg/g for ArgR, HisR, MetR, and CysR, respectively. The amino acid resins could effectively and selectively recover trace Au(III) ions from the leaching solutions of printed circuit board and gold slag waste. Lastly, the mechanism underlying amino acid resin’s Au(III) ion recovery capability was investigated by FTIR, XRD, and XPS analyses. This work describes a series of cost-effective gold adsorbents with excellent selectivity and adsorption capacity to boost their practical application.

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Mechanism of selective gold adsorption on ion-imprinted chitosan resin modified by thiourea

Cited by 64 publications

References 43 publications

Molecularly imprinted photocatalysts: fabrication, application and challenges

Molecularly imprinted photocatalysts: fabrication, application and challenges

Selective Recovery of Gold from Electronic Waste by New Efficient Type of Sorbent

Selective and Effective Gold Recovery from Printed Circuit Boards and Gold Slag Using Amino-Acid-Functionalized Cellulose Microspheres

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