高锰酸钾改性小麦秸秆吸附Cd2+的性能研究

doi:10.19741/j.issn.1673-4831.2018.0434

摘要/Abstract

摘要：

以高锰酸钾改性小麦秸秆为吸附剂吸附溶液中重金属离子Cd²⁺，并对其进行表征，研究pH、吸附时间、固液比、温度和解吸对其吸附Cd²⁺的影响。结果表明，对4种不同浓度高锰酸钾改性小麦秸秆观察发现，0.05 mol·L^-1高锰酸钾改性制备的小麦秸秆表面更加光滑，且带有较多负电荷，有利于提高对Cd²⁺的吸附性能。改性小麦秸秆对Cd²⁺的吸附在300 min后达到平衡，并符合拟二级动力学方程。当吸附溶液pH值为6，m（吸附剂）∶V（溶液）为1∶300时，吸附效果最佳。由Langmuir等温吸附方程拟合发现，0.05 mol·L^-1高锰酸钾改性制备的吸附剂对Cd²⁺的吸附量最大，为30.21 mg·g^-1，大于未改性小麦秸秆最佳吸附量（5.7 mg·g^-1），结合解吸可知该吸附剂对Cd²⁺的吸附具有较好稳定性。

关键词: 高锰酸钾, 小麦秸秆, 镉, 吸附, 改性

Abstract:

Heavy metal ions Cd²⁺ were adsorbed by potassium-permanganate-modified wheat straw. The modified wheat straw was characterized by scanning electron microscopy,zeta potential,and Fourier transform infrared spectroscopy. The effects of pH,adsorption time,solid-liquid ratio,and temperature of the solution and desorption on Cd²⁺ adsorption were also studied. Four different concentrations of potassium-permanganate-modified wheat straw were observed. Results show that,compared with the surfaces of other concentrations,the surface of 0.05 mol·L^-1 potassium-permanganate-modified wheat straw appeared smoother and had more negative charges. These outcomes were beneficial to improving the adsorption performance of Cd²⁺. Moreover,the adsorption reached equilibrium at 300 min and fitted the pseudo two-order kinetic equation. The best adsorption effect was obtained when the pH of the modified wheat straw was 6,and the solid-liquid ratio was 1:300. According to the Langmuir isothermal adsorption equation,the adsorbents prepared using the modified adsorbents of 0.05 mol·L^-1 had the largest adsorption capacity for Cd²⁺ (30.21 mg·g^-1)far larger than the optimum adsorption capacity of the unmodified wheat straw (5.7 mg·g^-1). The adsorbent has been found to have good stability for Cd²⁺ adsorption.

Key words: potassium permanganate, wheat stalk, Cd²⁺, adsorbent, modification

中图分类号:

解宇峰, 程德义, 石佳奇, 祝欣, 李志琳, 王磊. 高锰酸钾改性小麦秸秆吸附Cd²⁺的性能研究[J]. 生态与农村环境学报, 2019, 35(5): 668-674.

XIE Yu-feng, CHENG De-yi, SHI Jia-qi, ZHU Xin, LI Zhi-lin, WANG Lei. Adsorption of Cd²⁺ by Potassium-Permanganate-Modified Wheat Straw[J]. Journal of Ecology and Rural Environment, 2019, 35(5): 668-674.

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高锰酸钾改性小麦秸秆吸附Cd²⁺的性能研究

Adsorption of Cd²⁺ by Potassium-Permanganate-Modified Wheat Straw

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