Mechanistic study of selective adsorption and reduction of Au (III) to gold nanoparticles by ion-imprinted porous alginate microspheres

Gao, Xiangpeng; Li, Jun; Li, Mingyang; Guo, Cheng; Long, Hongming; Zhang, Yan; Xin, Lili

doi:10.1016/j.cej.2019.123897

Cited by 101 publications

(23 citation statements)

References 59 publications

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“…The code developed for improved non-linear fitting can be applied in many areas where the adsorption is studied. Adsorption is often used in studying environmental processes such as the adsorption of environmentally harmful gases [42,43], the adsorption of substances from water and wastewaters [44,45], the extraction of precious metals from electronic wastes [46], and adsorption-cooling systems [47]. The adsorption process is also important for new types of packaging like active packaging, where moisture is adsorbed by the active component situated within packaging material or in sachets inside packaging [48].…”

Section: Discussionmentioning

confidence: 99%

Adsorption between Quercetin Derivatives and β-Glucan Studied with a Novel Approach to Modeling Adsorption Isotherms

et al. 2020

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Interactions between polyphenols and fibers are important for polyphenol bioactivities, and have been studied in vitro with adsorption process and isotherms. However, the theoretical interpretations of adsorption potentially can be affected by the method of isotherm modeling. The aim was to study the interactions between β-glucan and quercetin derivatives (quercetin-3-glucoside, quercetin-3-galactoside, quercetin-3-rhamnoside) by studying adsorption, and to potentially improve the modeling of adsorption isotherms. Quercetin derivatives were determined by using spectrophotometric method. Experimental results were modeled with Langmuir, Dubinin-Radushkevich, and Hill isotherms using non-linear regression, linear regression, and improved non-linear regression. For improved non-linear regression, code in the R programming language was developed. All quercetin derivatives adsorbed onto the surface of β-glucan. Improved non-linear regression gave somewhat lower errors and may be the most appropriate for adsorption interpretation. According to isotherms obtained with improved regression, it may be suggested that adsorption is higher for rhamnoside and glucoside of quercetin than for quercetin-3-galactoside which agrees with experimental results. Adsorption could be a physical process. The spatial arrangement of hydroxyl (OH) groups on the glycoside part of quercetin could affect the adsorption. In conclusion, a novel approach using improved non-linear regression has been shown to be a useful, novel tool for adsorption interpretation.

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Section: Discussionmentioning

confidence: 99%

Adsorption between Quercetin Derivatives and β-Glucan Studied with a Novel Approach to Modeling Adsorption Isotherms

et al. 2020

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“…102,[118][119][120] For example, by using alginate as a monomer and Calcium as a cross-linker, Au(III) imprinted porous epichlorohydrin/thiourea modified alginate beads were synthesized. 102 The imprinted adsorbent displayed outstanding binding selectivity towards the target Au(III) from multi-metallic solutions with a binding capacity of 184.82 mg g -1 . Interestingly, photoreduction of Au(III) to gold particles might occur during the binding process under UV light illumination.…”

Section: Selective Removal Of Metal Ions With Photoreduction Systemmentioning

confidence: 99%

Molecularly imprinted photocatalysts: fabrication, application and challenges

et al. 2022

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“…The intensity increase of Si-O at 106.2 eV significantly, which was due to the reaction between carboxyl groups in the depressant molecule and Si in aegirite surface. The corresponding BE peaks at 726.6 and 715.5 eV are for Fe (III) 2p1/2, and Fe (III) 2p3/2, respectively; 733.4 and 719.7 V are for Fe (III) 2p1/2 satellite, and Fe (III) 2p3/2 satellite, respectively (Biesinger, 2011;Uhlig, 2001). There four deconvoluted peaks migrated to lower binding energies to a certain extent, indicating that iron absorbed electrons during TGA or MPA adsorption process.…”

Section: Xps Analysesmentioning

confidence: 99%

Comparison of the depression effect of two thiol depressants on the separation of specularite and aegirite

Li¹,

Zhang²,

Gao³

et al. 2022

Physicochem. Probl. Miner. Process.

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In this work, two thiol-type reagents, thioglycolic acid (TGA) and mercaptopropionic acid (MPA), were firstly exploited and compared as aegirite depressants with sodium oleate (NaOl) as the collector to separate specularite from aegirite by flotation. The adsorption performances and mechanisms of TGA and MPA on aegirite surface were investigated via flotation experiments, Zeta potential tests, adsorption measurements, contact angle dimensions, and surface characterizations. The results of flotation indicated that TGA and MPA exhibited a considerable depression impact on the flotation of aegirite but little effect on specularite. TGA depicted more excellent depression performance than MPA, which was confirmed by HLB calculation. The results demonstrated that TGA and MPA favorably adsorbed on aegirite surface instead of specularite, hindering the subsequent adsorption of NaOl on specularite and resulting in the surface being hydrophilic. XPS results revealed that TGA and MPA were significantly adsorbed on the surface of aegirite through an interaction between the carboxyl and thiol groups of the depressants and the Si and Fe on the surface of aegirite.

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Mechanistic study of selective adsorption and reduction of Au (III) to gold nanoparticles by ion-imprinted porous alginate microspheres

Cited by 101 publications

References 59 publications

Adsorption between Quercetin Derivatives and β-Glucan Studied with a Novel Approach to Modeling Adsorption Isotherms

Adsorption between Quercetin Derivatives and β-Glucan Studied with a Novel Approach to Modeling Adsorption Isotherms

Molecularly imprinted photocatalysts: fabrication, application and challenges

Comparison of the depression effect of two thiol depressants on the separation of specularite and aegirite

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