Efficient Removal of Cadmium (Cd2+) from Aqueous Solutions by Chitosan@fig Branch Biochar: Adsorption Performance and Enhanced Complexation

文献类型： 外文期刊

第一作者： Xiao, Fan

作者： Xiao, Fan;Su, Dongming;Ren, Yanfang;Zhou, Jieyu;Xu, Haojie;He, Junyu;Li, Zhaojun

作者机构：

期刊名称：LANGMUIR （ 影响因子：3.9； 五年影响因子：3.7 ）

ISSN： 0743-7463

年卷期： 2025 年 41 卷 6 期

页码：

收录情况： SCI

摘要： In this study, fig branch biochar (FBB) was modified by chitosan to improve the Cd2+ adsorption performance from an aqueous solution. The surface area, pores, and functional groups of chitosan-modified fig branch biochar (CMFBB) were characterized by DTG-TGA, BET, SEM-EDS, FTIR, and XRD. In addition, the impact of various conditions on the Cd adsorption performance of the biochar was analyzed, including dosage, initial pH, concentration, temperature, reaction time, and coexisting cations. The adsorption kinetics, isotherms, and practical applications were also investigated. Under the optimized conditions including pH 6, adsorbent dose 2 g L-1, reaction time 90 min, Cd2+ concentration 100 mg L-1, and 25 degrees C, the Cd2+ adsorption capacity was 62.25 mg g-1, representing a 78.26% increase compared to FBB. The adsorption data for Cd2+ by CMFBB were found to be well-described by the pseudo-second-order kinetic and Langmuir isothermal models, indicating that a monolayer chemical adsorption process occurred. The Cd2+ adsorption was a spontaneous endothermic process, and the coexisting cations exerted negligible influence on the adsorption process. After five adsorption-desorption cycles, CMFBB maintained an adsorption efficiency of 92.3%, demonstrating excellent regeneration capability. The quantification of adsorption mechanisms suggested that physical adsorption, cation exchange, precipitation, complexation, and pi-pi interactions accounted for 3.70, 2.50, 33.04, 58.76, and 2.0% of the total adsorbed Cd2+ in CMFBB, respectively. Compared with FBB, the level of CMFBB increased 26.52% in complexation. This work implies that CMFBB has great potential as an effective absorbent for treating Cd2+ polluted water.

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