Recovery of [Au(CN) 2 ] − from gold cyanidation with graphene oxide as adsorbent

Yang, Lu; Jia, Feifei; Song, Shaoxian

doi:10.1016/j.seppur.2017.05.053

Cited by 43 publications

(7 citation statements)

References 17 publications

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“…A schematic proposal to explain the Au–CN complex photocatalytic reduction is presented in Figure 7 . The first step consists of the Au(CN) 2 − anion adsorption on the composite’s surface in an aqueous solution at pH 12 [ 47 , 48 ]. In the second step, UV light irradiation starts with the generation of the electron–hole pairs and promotes the Au(CN) 2 − reduction and isopropyl alcohol oxidation, respectively.…”

Section: Resultsmentioning

confidence: 99%

Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites

et al. 2022

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Graphene-TiO2 composites have been investigated in various photocatalytic reactions showing successful synergy compared to pristine TiO2. In the present work, graphene oxide (GO) was synthesized by the Hummers method and then reduced graphene oxide-TiO2 composites (rGO/TiO2) were obtained by an in situ GO photoreduction route. X-ray diffraction, FTIR, Raman, UV–vis DRS, and photoluminescence were the main characterization techniques. The obtained composites containing 1 and 3 wt.% rGO were evaluated in the cyanide (50 mg/L) oxidation and Au-cyanide complex (300 mg/L) degradation under UV-A light. The composites showed higher photocatalytic activity than TiO2, mainly with the 1% rGO content. Cyanate and gold nanoparticles, deposited on the photocatalyst’s surface, were the main byproducts during the photocatalyst assessment. The improved photocatalytic activity of the composites was attributed to a higher rate of electron transfer and a lower rate of charge recombination due to the chemical interaction of rGO with TiO2.

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Section: Resultsmentioning

confidence: 99%

Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites

et al. 2022

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“…21 The fundamental reason behind its priority is its two extraordinary features: (i) large surface area (theoretically 2630 m 2 g −1 ), 22 which aids it in offering a suitable specic area for adsorption; (ii) great extents of epoxy, hydroxyl, and carboxyl functional groups on the basal planes and edges can easily t with metal ions through the chelation mechanism or electrostatic interaction. 23,24 Therefore, in this research, graphene oxide is chosen for the adsorption of HMIs. Despite all of the unique properties of GO, there is a striking problem in that the solid GO sorbent tends to aggregate during adsorption due to p-p interactions and hence retard the adsorption phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Engineering GO@Zn–Hap@CA porous heterostructure for ultra-fast and ultra-high adsorption efficacy: investigation towards the remediation of chromium and lead

Mahmud

Hossain

Mobarak

et al. 2022

Environ. Sci.: Adv.

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“…Activated carbon, one of the most common adsorbents, has been utilized to recover Au(CN) 2 – for a long time, owing to its high surface area and well-developed porous structure . It is reported that the maximum Au(CN) 2 – adsorption capacity of commercial activated carbon is 56 mg/g and that of sulfur-impregnated activated carbon can even reach 126 mg/g . While for Au(S 2 O 3 ) 2 3– , activated carbon results in a weak affinity with an adsorption capacity of only 20–30 mg/g, , possibly because of the high anionic charge of the thiosulfate complex and the bulkiness of the thiosulfate ions compared to Au(CN) 2 – .…”

Section: Introductionmentioning

confidence: 99%

In Situ Reduction of Au(I) for Efficient Recovery of Gold from Thiosulfate Solution by the 3D MoS₂/Chitosan Aerogel

Chen

Liang

Yang

et al. 2020

ACS Sustainable Chem. Eng.

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A three-dimensional porous MoS2/chitosan (MoS2/CS) aerogel with excellent mechanical strength and stability was constructed in this work through anchoring MoS2 to the surface of the CS aerogel. It is found that the MoS2/CS aerogel can effectively recover gold from thiosulfate solution via direct in situ reduction of Au(I) to Au0 under sunlight, thus realizing the one-step recovery of gold, which greatly benefits the development of thiosulfate leaching for gold extraction. Furthermore, according to the results of photocurrent, ultraviolet–visible absorption, and atomic absorption spectrophotometry, it has been found that the reduction of the MoS2/CS aerogel to Au(I) is mainly consisted of photoreduction and chemical reduction, where photoreduction plays a dominant role, primarily because of the narrow band gap and higher conduction band edge of the MoS2/CS aerogel as well as the strong reducibility of photogenerated electrons.

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Recovery of [Au(CN) 2 ] − from gold cyanidation with graphene oxide as adsorbent

Cited by 43 publications

References 17 publications

Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites

Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites

Engineering GO@Zn–Hap@CA porous heterostructure for ultra-fast and ultra-high adsorption efficacy: investigation towards the remediation of chromium and lead

In Situ Reduction of Au(I) for Efficient Recovery of Gold from Thiosulfate Solution by the 3D MoS₂/Chitosan Aerogel

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Recovery of [Au(CN) 2 ] − from gold cyanidation with graphene oxide as adsorbent

Cited by 43 publications

References 17 publications

Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites

Enhancing Free Cyanide Photocatalytic Oxidation by rGO/TiO2 P25 Composites

Engineering GO@Zn–Hap@CA porous heterostructure for ultra-fast and ultra-high adsorption efficacy: investigation towards the remediation of chromium and lead

In Situ Reduction of Au(I) for Efficient Recovery of Gold from Thiosulfate Solution by the 3D MoS2/Chitosan Aerogel

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In Situ Reduction of Au(I) for Efficient Recovery of Gold from Thiosulfate Solution by the 3D MoS₂/Chitosan Aerogel