Abstract Modified kaolinite nanolayers were prepared from two-dimensional (2D) raw kaolin through a combination of calcination, acid leaching, and ultrasonic dispersion. The obtained nanolayers were subjected to effective modification with amino functional groups through grafting with (3-aminopropyl) triethoxysilane (APTES). The resultant materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) combined with energy dispersive X-ray spectroscopy (EDS), scanning transmission electron microscopy (STEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The results revealed that the chemically modified materials exhibited increased specific surface area and pore structures, and chemical treatments showed obvious effects on the adsorption performance of kaolin. Owing to the protonation of the amino groups, the organic modified material exhibited excellent adsorption performance for Congo red and efficient regeneration. The chemically modified kaolinite nanolayers show significant potential applications in the fields of adsorption, separation, catalysis, and other environmental remediation.

中文翻译：

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用于去除有机污染物的化学改性高岭石纳米层

摘要 以二维 (2D) 原料高岭土为原料，通过煅烧、酸浸和超声分散相结合制备了改性高岭石纳米层。通过用（3-氨基丙基）三乙氧基硅烷（APTES）接枝，对获得的纳米层进行氨基官能团的有效改性。所得材料通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 结合能量色散 X 射线光谱 (EDS)、扫描透射电子显微镜 (STEM)、傅里叶变换红外 (FTIR) 和 X 射线进行表征。光电子能谱（XPS）。结果表明，化学改性材料的比表面积和孔结构增加，化学处理对高岭土的吸附性能有明显影响。由于氨基的质子化，有机改性材料对刚果红表现出优异的吸附性能和高效的再生能力。化学改性的高岭石纳米层在吸附、分离、催化和其他环境修复领域显示出重要的潜在应用。