摘要：

利用农业废弃物稻壳在773 K条件下制备稻壳生物炭，对铅离子的吸附行为特性进行了分析研究。实验结果表明，稻壳生物炭可以有效地去除铅离子；吸附等温线更符合Langmuir等温吸附方程，属自发的吸热反应；吸附动力学更符合假二级动力学模型，吸附限速是由表面扩散和内扩散共同控制的；去除稻壳生物炭的灰分后，平衡吸附量明显减小，无机组分对去除铅离子有重大贡献。

关键词: 稻壳生物炭, 铅离子, 灰分, 吸附机理

Abstract:

The rice husk biochar was prepared using the agricultural waste rice husk at 773 K, and then its adsorption behavioral characteristics on Pb ions were analyzed. The experimental results showed that rice husk biochar effectively removed Pb ions. The adsorption isotherm better conformed to the Langmuir isotherm adsorption equation, which was a spontaneous endothermic reaction. The adsorption kinetics was more accordant with the pseudo-second-order kinetic model, while the adsorption rate limit was controlled by the surface diffusion and internal diffusion together. After removing the ash contents of rice husk biochar, the equilibrium adsorption amount was remarkably reduced, and the inorganic components had made significant contributions to Pb ion removal.

Key words: rice husk biochar, plumbum ion, ash content, adsorption mechanism

中图分类号: 

• TQ424