Recovery of Au(III) from an aqueous solution by aminopropyltriethoxysilane-functionalized lignocellulosic based adsorbents

Saman, Norasikin; Rashid, Muhammad Usman; Lye, Jimmy Wei Ping; Mat, Hanapi

doi:10.1016/j.reactfunctpolym.2017.12.015

Cited by 49 publications

(10 citation statements)

References 56 publications

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“…Over the period of the adsorption process, the kinetics of the adsorption process was either controlled by surface reaction process or diffusion. For diffusion process, there were three main steps involved, which were bulk diffusion, film diffusion, and intraparticle diffusion [49]. Bulk diffusion is the diffusion from the surrounding adsorbate solution to the adsorbent surface.…”

Section: Diffusion Kineticsmentioning

confidence: 99%

Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions

Rahim

Iswarya

Johari

et al. 2020

Environmental Engineering Research

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Desiccated coconut waste (DCW) is an agricultural waste that originates from the coconut milk processing industry. In this study, it was utilized for the removal of copper (Cu(II)) and nickel (Ni(II)) via adsorption process. The physicochemical characterization of the DCW adsorbent shows that the adsorbent have a surface area of 6.63 m<sup>2</sup>/g, have high elemental carbon content and existences of important functional groups on its surface. The adsorptive capability of DCW adsorbent in removing the heavy metal were conducted in batch studies. DCW adsorbent performed highest Ni(II) and Cu(II) adsorption capacity at pH 6, where equilibrium is achieved at 450 minutes. The kinetic analysis showed the adsorption agreed with pseudo-second order kinetic model, indicating the Cu(II) and Ni(II) adsorption were a chemical adsorption, limited by the film diffusion. The DCW adsorbent still retained its effective adsorption capacity after 2 adsorption-desorption cycles, which is one of the excellent criteria of a good adsorbent for an adsorption process.

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Section: Diffusion Kineticsmentioning

confidence: 99%

Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions

Rahim

Iswarya

Johari

et al. 2020

Environmental Engineering Research

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“…Many adsorbents have been attempted for the purpose of capturing gold species from a complex solution. The literature includes biomaterials such as lignin-based − and chemically modified polysaccharide adsorbents, − chelating resins, − functionalized silica, , nanoparticles, , metal–organic frameworks (MOFs), , and porous organic polymers . In general, a common strategy for designing an adsorbent is to incorporate electron-rich atoms such as oxygen, nitrogen, and sulfur to take advantage of their ability to coordinate or chelate metal ions.…”

Section: Introductionmentioning

confidence: 99%

Gold Recovery from E-Waste by Porous Porphyrin–Phenazine Network Polymers

et al. 2020

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Gold recovery from electronic waste could prevent excessive mining with toxic extractants and provide a sustainable path for recycling precious metals. Unfortunately, no viable recycling is practiced, except burning electronic circuit boards in underdeveloped countries, mainly because of the lack of chemical scavengers as adsorbents. Here, we report the synthesis of a family of porphyrin− phenazine-based polymers and their gold-capturing properties as well as application in gold recovery from actual e-waste. The polymers show high selectivity toward gold as well as other precious metals. The Au(III) adsorption isotherms were well-fitted to the Langmuir adsorption model and proportionality between porosity and uptake capacity was observed. Solution pH values and illumination conditions were shown to have influences on the performance of the adsorbents with the highest capacity of 1.354 g/g obtained in acidic pH and under continuous UV irradiation. Such a remarkable capacity of 7 times the theoretical estimate was achieved through photochemical adsorption−reduction mechanism supported by the observed suppressing effect of oxidant on gold-capturing ability. The adsorbents are robust and recyclable, a significant advantage over other emerging materials.

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“…CS/PmPD membranes can process up to 410 mg g −1 of Au( iii ), which is comparable to previously reported values (Table S1, ESI†). 10,12,25–40…”

Section: Resultsmentioning

confidence: 99%

Chitosan-poly(m-phenylenediamine) membranes for efficient gold recovery from acidic aqueous solutions

et al. 2022

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Recovery of Au(III) from an aqueous solution by aminopropyltriethoxysilane-functionalized lignocellulosic based adsorbents

Cited by 49 publications

References 56 publications

Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions

Conversion of coconut waste into cost effective adsorbent for Cu(II) and Ni(II) removal from aqueous solutions

Gold Recovery from E-Waste by Porous Porphyrin–Phenazine Network Polymers

Chitosan-poly(m-phenylenediamine) membranes for efficient gold recovery from acidic aqueous solutions

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