Abstract：To remove cadmium (Cd), a novel adsorbent, called mercaptopropionyl wheat straw (MPWS), was prepared by the alkali pretreatment and the mercaptopropionyl modification with wheat straw (WS). The adsorption performance and mechanism of MPWS for Cd(Ⅱ) were studied by employing static adsorption experiments, desorption experiment, and various characterization methods. The results showed that the removal rate of Cd(Ⅱ) in water sample could reach 97.21% when the oscillation rate was 150r/min, the adsorption temperature was 30℃, the adsorption time was 2h, the initial pH value was 6.0, and the initial concentration of Cd(Ⅱ) was 100mg/L. HCl solution and EDTA solution as desorption reagents had good desorption performance for MPWS-Cd, and the highest desorption efficiency was more than 95%. The adsorption behavior of MPWS for Cd(Ⅱ) accorded with the Langmuir isotherm model. Furthermore, the adsorption process of Cd(Ⅱ) by MPWS and the desorption process of MPWS-Cd by the desorption reagents could conform to the pseudo-second-order kinetic model, and these processes were spontaneous endothermic. The characterization results revealed that sulfydryl groups, amine groups, hydroxyl groups and carboxyl groups in MPWS would participate in the coordination reaction with Cd(Ⅱ) in the chemical adsorption. The adsorption mechanism between MPWS and Cd(Ⅱ) mainly includes coordination, ion exchange, electrostatic adsorption and physical adsorption. The desorption mechanism of MPWS-Cd by HCl solution is mainly protonation, while the desorption mechanism of MPWS-Cd by EDTA solution is mainly coordination competition.
孙永鹏, 王刚, 何扬洋, 罗仕成, 汤春晖. 巯基改性小麦秸秆对镉吸附与解吸的性能及机制[J]. 中国环境科学, 2023, 43(5): 2264-2276.
SUN Yong-peng, WANG Gang, HE Yang-yang, LUO Shi-cheng, TANG Chun-hui. Performance and mechanism of adsorption and desorption for cadmium in aqueous solution with mercaptopropionyl wheat straw. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2264-2276.
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