酸改性坡缕石对Cu2+的吸附性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1306

摘要/Abstract

摘要： 坡缕石是一种含水富镁铝硅酸盐黏土矿物,具有独特的链层状晶体结构,在胶体、催化、吸附等众多领域表现出了优异的应用性能。本研究采用不同种类酸改性坡缕石,溶出八面体中阳离子的方式调控坡缕石结构,以Cu²⁺作为目标污染物,采用静态吸附实验研究了不同改性条件对坡缕石吸附Cu²⁺的影响规律。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)、N₂吸附、固体核磁共振(NMR)和热重(TG)等测试对改性前后坡缕石的结构进行了表征。研究结果表明,酸改性后的坡缕石杂质减少且微孔容积增大,对Cu²⁺的吸附能力也显著提高。反应时间为120 min、反应温度为60 ℃、溶液pH值为7的盐酸改性坡缕石对Cu²⁺吸附效果最佳,最大吸附量为70.64 mg/g。本研究结果对坡缕石在环境治理领域的应用具有重要研究意义。

关键词: 坡缕石, Cu²⁺, 吸附性能, 酸改性, 晶体结构, 吸附条件, 水污染

Abstract: Palygorskite is a hydrous magnesium-aluminum-silicate clay mineral, featuring a distinctive chain-layered crystal structure. It demonstrates outstanding application performance in numerous domains such as colloids, catalysis, and adsorption. In this research, various types of acids were employed to modify palygorskite, regulating its structure by dissolving the cations in the octahedral layer. With Cu²⁺ as the target contaminant, the effect laws of diverse modification conditions on the adsorption of Cu²⁺ by palygorskite were investigated via static adsorption experiments. The structures of palygorskite before and after modification were characterized via X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), N₂ adsorption, solid-state nuclear magnetic resonance (NMR), and thermogravimetry (TG). The research findings indicate that after acid modification, the impurities in palygorskite decrease and micropore volume increases, significantly enhancing the adsorption capacity for Cu²⁺. Moreover, the HCl modified palygorskite achieves the best adsorption effect under the conditions of a reaction time of 120 min, a reaction temperature of 60 ℃ and a solution pH value of 7, and maximum adsorption capacity is 70.64 mg/g. The results of this study hold significant research implications for the application of palygorskite in the field of environmental governance.

Key words: palygorskite, Cu²⁺, adsorption performance, acid modification, crystal structure, adsorption condition, water pollution

中图分类号:

X751

吴丽梅, 栾奕, 王晓龙, 唐宁, 李甘宁, 雷馨宇. 酸改性坡缕石对Cu²⁺的吸附性能研究[J]. 硅酸盐通报, 2025, 44(5): 1888-1898.

WU Limei, LUAN Yi, WANG Xiaolong, TANG Ning, LI Ganning, LEI Xinyu. Research on Adsorption Performance of Acid Modified Palygorskite for Cu²⁺[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1888-1898.

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酸改性坡缕石对Cu²⁺的吸附性能研究

Research on Adsorption Performance of Acid Modified Palygorskite for Cu²⁺

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