Cu负载花生壳生物炭对Cr(VI)的吸附性能研究

Adsorption Properties of Cr(VI) by Cu/Peanut Shell Biochar

摘要: 本文以花生壳作为原料，成功制备出了活化生物炭与Cu负载生物炭。所制备的活化生物炭对Cr(VI)去除量可达225.7 mg∙g⁻¹，Cu负载后，去除量达到244.74 mg∙g⁻¹。等温吸附模型的数据拟合结果表明活化生物炭更加符合Freundlich模型，而负载生物炭更加符合Langmiur模型，说明负载使得生物炭从非理想多层吸附向理想单层吸附转变。动力学吸附模型的数据拟合结果表明活化生物炭更加符合Elovich模型，而负载生物炭更加符合准二级动力学模型，说明负载后生物炭的吸附过程转变为化学吸附。本文的研究成果在废水中Cr(VI)的处理方面具有良好的应用前景。

Abstract: In this paper, peanut shell was used as raw material to successfully prepare activated biochar and Cu-supported biochar. The maximum removal amount of Cr(VI) by the prepared activated biochar can reach 225.7 mg∙g⁻¹, and the maximum removal amount further reaches 244.74 mg∙g⁻¹ after Cu loading. The data fitting results of the isothermal adsorption model indicated that the loaded biochar changed from non-ideal multilayer adsorption to ideal single-layer adsorption. The data fitting results of the ki-netic adsorption model showed that the activated biochar was more consistent with the Elovich model, while the loaded biochar was more consistent with the quasi-second- order kinetic model, indicating that the adsorption process of biochar after loading was transformed into chemical ad-sorption. The research content of this paper has a good application prospect in the treatment of Cr(VI) in wastewater.