The influence of chemical oxidation on the adsorption properties of 3D graphene materials by the enhanced accessibility

IF 4.7 3区材料科学 Q2 CHEMISTRY, PHYSICAL

Colloid and Interface Science Communications Pub Date : 2024-04-10 DOI:10.1016/j.colcom.2024.100785

Mengnan Yin , Di Zhang , Lin Shi , Xiao Sun , Junyu Liu , Yangwei Bai

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Abstract

Graphene aerogel (GA) and hydrogel (GH) were oxidized using hydrogen peroxide (H₂O₂) and nitric acid (HNO₃), respectively. The oxidized GA enhanced bisphenol A (BPA, hydrophobic) and methyl orange (MO, hydrophilic) adsorption. The accessibility of the air-closed pores in oxidized GA was enhanced due to the increase of oxygen-containing functional groups, exposing some new adsorption sites, as identified by ¹H NMR relaxation measurements. The oxidized GH inhibited BPA adsorption but increased MO adsorption. Higher oxygen-containing functional groups form water clusters and occupy adsorption sites for hydrophobic pollutants. Nevertheless, increased hydrophilicity facilitated the adsorption of hydrophilic pollutants. In addition, the adsorption rate of BPA on oxidized GA was decelerated, while that of MO was accelerated. The adsorption rates of both BPA and MO were accelerated on oxidized GH. This study emphasized that oxidation has different effects on the accessibility of air-enclosed pores and the adsorption properties of GA and GH.

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化学氧化对三维石墨烯材料吸附特性的影响--增强的可及性

分别使用过氧化氢（H2O2）和硝酸（HNO3）对石墨烯气凝胶（GA）和水凝胶（GH）进行氧化。氧化后的石墨烯气凝胶增强了对双酚 A（BPA，疏水性）和甲基橙（MO，亲水性）的吸附。通过 1H NMR 驰豫测量发现，由于含氧官能团的增加，氧化 GA 中空气封闭孔隙的可达性得到了提高，从而暴露出一些新的吸附位点。氧化的 GH 抑制了 BPA 的吸附，但增加了 MO 的吸附。含氧较高的官能团会形成水簇，占据疏水性污染物的吸附位点。不过，亲水性的增加有利于吸附亲水性污染物。此外，双酚 A 在氧化 GA 上的吸附速度减慢，而 MO 的吸附速度加快。在氧化的 GH 上，双酚 A 和 MO 的吸附速率都加快了。这项研究强调，氧化对气密孔隙的可及性以及 GA 和 GH 的吸附特性具有不同的影响。

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来源期刊

Colloid and Interface Science Communications Materials Science-Materials Chemistry

CiteScore

9.40

自引率

6.70%

发文量

125

审稿时长

43 days

期刊介绍： Colloid and Interface Science Communications provides a forum for the highest visibility and rapid publication of short initial reports on new fundamental concepts, research findings, and topical applications at the forefront of the increasingly interdisciplinary area of colloid and interface science.