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石墨烯气凝胶对放射性废液中单宁酸的吸附

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在常压水浴条件下制备三维石墨烯气凝胶(3DrGO-Lcy),研究其吸附放射性废液中的单宁酸.采用扫描电子显微镜(SEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)和拉曼光谱(Raman)等技术对其结构和形貌进行表征,研究了吸附时间、初始浓度、pH值及吸附温度对单宁酸吸附性能的影响,并进一步探究了3DrGO-Lcy对单宁酸的吸附机理.结果表明,在常压水浴条件下,以半胱氨酸为交联剂,能有效将氧化石墨烯交联成三维多孔状的气凝胶.该气凝胶对单宁酸的吸附在120 min即可达到吸附平衡.在pH为4的酸性条件下,对单宁酸的最大平衡吸附容量可达89 mg/g.此外,3DrGO-Lcy对单宁酸的吸附动力学过程符合准二阶动力学模型,而等温吸附过程符合Freundlich模型,表明3DrGO-Lcy通过π-π堆积和官能团氢键作用的多分子层化学吸附过程实现对单宁酸的吸附.
Adsorption of Tannic Acid from Radioactive Waste Liquid by Graphene Aerogel
Three-dimensional graphene aerogels(3DrGO-Lcy)were prepared under atmospheric pressure in a water bath,and the adsorption of tannic acid from radioactive waste liquid was investigated.The structure and morphology of 3DrGO-Lcy were characterized by scanning electron microscope(SEM),X-ray diffraction(XRD),Fourier transform infrared(FT-IR),and Raman spectra,and the effects of adsorption time,initial concentration,pH value,and adsorption temperature on the adsorption performance of tannic acid were studied.The adsorption mechanism of tannic acid by 3DrGO-Lcy was further investigated.The results showed that graphene oxide could be effectively crosslinked into three-dimensional porous aerogels with cysteine as crosslinking agent under normal pressure water bath condition.The adsorption equilibrium of tannic acid could be reached in 120 min.At an acidic pH of 4,the maximum equilibrium adsorption capacity of tannic acid reached 89 mg/g.Furthermore,the adsorption kinetics of tannic acid on 3DrGO-Lcy conformed to the pseudo-second-order kinetic model,while the isothermal adsorption process conformed to the Freundlich model,which indicated the adsorption of tannic acid on 3DrGO-Lcy occurred through a multimolecular layer chemisorption process involving π-π stacking and hydrogen bonding of functional groups.

grapheneaerogelorganic radioactive wastetannic acidadsorption

刘波、孙红娟、唐旭、刘菊、陈燕、马金铄

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西南科技大学 固体废物处理与资源化教育部重点实验室,四川 绵阳 621010

西南科技大学 矿物材料及应用研究所,四川 绵阳 621010

石墨烯 气凝胶 有机放射性废液 单宁酸 吸附

四川省自然科学基金项目

2022NSFSC1035

2024

非金属矿
苏州非金属矿工业设计研究院

非金属矿

CSTPCD
影响因子:0.636
ISSN:1000-8098
年,卷(期):2024.47(1)
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