Recovery of Gold from Chloride Solution by TEMPO-Oxidized Cellulose Nanofiber Adsorbent

Jafari, Sanaz; Wilson, Benjamin P.; Hakalahti, Minna; Tammelin, Tekla; Lundström, Mari; Sillanpää, Mika

doi:10.3390/su11051406

Cited by 20 publications

(12 citation statements)

References 36 publications

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“…Given the increasing number of environmental accidents due to the application of these gold-recovery technologies, scientists are looking for environmentally friendly technologies, such as adsorption [ 18 ]. The recovery process only makes sense if the cost of recovery is much lower than the value of the recovered gold.…”

Section: Introductionmentioning

confidence: 99%

Estimation on Fixed-Bed Column Parameters of Breakthrough Behaviors for Gold Recovery by Adsorption onto Modified/Functionalized Amberlite XAD7

Negrea

Mihăilescu

Moșoarcă

et al. 2020

IJERPH

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The objective of this paper was to evaluate the potential of a new adsorbent material to recover Au (III) from real wastewater, in a column with a fixed bed in a dynamic regime. The material was obtained through functionalization, by impregnation of the commercial resin, Amberlite XAD 7 type, with L-glutamic acid, which has active groups –NH2 and –COOH. The goal of the experiments was to follow the correlation of fixed-bed column specific adsorption parameters (the effluent volume, the amounts of adsorbent, heights of the adsorbent layer in column) with the time necessary to cross the column. The experimental data obtained were modeled, using the Bohart–Adams, Yoon–Nelson Thomas and Clark models, to establish the mechanism of the Au (III) recovery process, in a dynamic regime. Also, we established the number of cycles for adsorption–desorption for which the new material can be used. We used 5% HNO3 (5%) as desorption agent in five adsorption–desorption cycles, until the process was no longer efficient. The degree of desorption varied between 84% and 34% from cycle 1 to cycle 5.

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Section: Introductionmentioning

confidence: 99%

Estimation on Fixed-Bed Column Parameters of Breakthrough Behaviors for Gold Recovery by Adsorption onto Modified/Functionalized Amberlite XAD7

Negrea

Mihăilescu

Moșoarcă

et al. 2020

IJERPH

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“…The most common method for extracting gold is dissolving it in aqua regia, but this process has critical steps, like evaporation of HCl and HNO 3 . The use of halides like the chlorine gas method is used mostly in the industrial application to dissolve gold and produce stable gold chlorides [45,46]. Shirin et al [47] proposed this method of dissolving gold by using the chlorine gas to synthesise a pure gold chloride solution, which can use the final product directly in the USP process.…”

Section: Introductionmentioning

confidence: 99%

Low-cost synthesis of AuNPs through ultrasonic spray pyrolysis

Tiyyagura

Majerič

Anžel

et al. 2020

Mater. Res. Express

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The present research informs about the synthesis of gold nanoparticles (AuNPs) through Ultrasonic Spray Pyrolysis (USP), which were collected in ethanol with 0.1% Polyvinylpyrrolidone (PVP). Initially, the research focused on two precursors, where the first represented a homemade H-HAuCl 4 , completed in our own laboratory through the chlorine gas method by using HCl and KMnO 4 , and the second was the commercial C-HAuCl 4 , prepared by using Gold (III) chloride tetrahydrate powder and deionised water. The goal was to find any potential precursor differences and their influences on the later use for AuNPs synthesis through USP using almost the same parameters. In the first step of research it was determined that the H-HAuCl 4 precursor was similar to C-HAuCl 4 in chemical composition, surface tension and pH value. This finding represented the starting point for being able to use H-HAuCl 4 in the USP for AuNPs' synthesis. In the second step, AuNPs were synthesised from both types of precursors. Afterwards, characterisation of some functional properties by FTIR and UVvis techniques was done directly for H-and C-AuNPs in the collecting media. For SEM/EDX and TEM microscopy both types of H-and C-AuNPs were dried, and observation revealed that the morphology, shape and size distribution of dried AuNPs were very similar. Based on the performed laboratory research, it could be concluded that prepared H-AuNPs could represent a new and lowcost effective solution for future USP transfer onto the industrial level, not only in in the process itself, but also in the field of Low-cost Precursor Preparation.Abbreviations

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“…As expected, CNs were reported to effectively coordinate and absorb several heavy metal cations, for example, Cu (II), Co (II), Cd (II), Ni (II), Pb (II), As (V), and Cr (VI) cation. Jafari et al also demonstrated the ability to efficiently adsorb gold from a chloride solution (98%) [50]. Ma et al further reported the ability of CNs to remove radioactive uranyl ions (UO22+), from solutions caused by the affinity of UO22+ ions with the carboxylate groups, and the maximum adsorption capacity 167 mg•g −1 is 2-3 times greater than traditional adsorbents (e.g., silica particle, montmorillonite) [51].…”

Section: Absorbents In Water Treatmentmentioning

confidence: 99%

Cellulose Nanomaterials as a Future, Sustainable and Renewable Material

et al. 2022

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Cellulose nanomaterials (CNs) are renewable, bio-derived materials that can address not only technological challenges but also social impacts. This ability results from their unique properties, for example, high mechanical strength, high degree of crystallinity, biodegradable, tunable shape, size, and functional surface chemistry. This minireview provides chemical and physical features of cellulose nanomaterials and recent developments as an adsorbent and an antimicrobial material generated from bio-renewable sources.

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Recovery of Gold from Chloride Solution by TEMPO-Oxidized Cellulose Nanofiber Adsorbent

Cited by 20 publications

References 36 publications

Estimation on Fixed-Bed Column Parameters of Breakthrough Behaviors for Gold Recovery by Adsorption onto Modified/Functionalized Amberlite XAD7

Estimation on Fixed-Bed Column Parameters of Breakthrough Behaviors for Gold Recovery by Adsorption onto Modified/Functionalized Amberlite XAD7

Low-cost synthesis of AuNPs through ultrasonic spray pyrolysis

Cellulose Nanomaterials as a Future, Sustainable and Renewable Material

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