数字农科院2.0

Multiscale Investigation of the interface interactions between humic acid-sulfhydryl grafted palygorskite composites and Cd2+

文献类型： 外文期刊

作者： Xiaojia Zhou;Haonan Lv;Tao Sun;Shihang Wu;Luqi Mi;Hao Yang;Renfu Zhang;Yuebing Sun

作者机构：

关键词： AFM force measurement;Cadmium;Humic acid;QCM-D adsorption;Sulfhydryl grafted palygorskite;Sustainable composite

期刊名称： Chemical Engineering Journal

ISSN： 1385-8947

年卷期： 2025 年 511 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Wastewater contaminated with Cd has attracted worldwide attention due to its pervasive hazards, and the application of composites is of vital significance. In this work, humic acid-sulfhydryl grafted palygorskite (HA-SGP) composites were prepared based on HA (Biomass-HA, Coal-HA, and Mixed-HA) and SGP to investigate the interface interactions between HA-SGP composites derived from different sources and Cd at multiple scales. Herein, we comprehensively evaluated surface properties and adsorption performance of composites, and the interfacial reaction mechanism between composites and Cd2+ at both macroscopic and microscopic levels. The results of adsorption experiments demonstrated that Elovich and Redlich-Peterson models are more appropriate for the adsorption of Cd2+ by HA-SGP, and the best adsorption effect and adsorption stability were observed for BSGP (BHA-SGP). The microscopic quartz crystal microbalance with dissipation (QCM-D) experiments also supported the viewpoint and showed that the adsorption capacity for Cd2+ was 85.41 ng/cm2. Notably, nanoscale force spectroscopy experiments revealed that the adhesion force between BSGP and Cd2+ was 2.02 nN based on abundant COOH, which attributed to the enhancement of chemical bonding, electrostatic attraction, and van der Waals force. Density functional theory (DFT) calculations indicated that the adsorption energy of BSGP for Cd2+ was −1.71 eV, which was subsequently interpreted by the differential charge density from the electron transfer perspective. In summary, this study provides quantitative nanoscale insights into the interface interactions of friendly BSGP composites with Cd, which can be extended to other green composites used for heavy metal purification in wastewater.

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