Abstract

This study evaluates the adsorption efficiency of Cd²⁺ and Cu²⁺ by peanut shell biochar (BPS) in monocomponent and bicomponent systems. The characterization indicated that BPS was mesoporous and amorphous, with presence of hydroxyl and carboxylic functional groups, with a pH_PZC of 7.9. The effects of pH, stirring speed and adsorbent dosage were investigated, and the best results were obtained at pH 5.9, 200 rpm and 2 g·L⁻¹. In monocomponent systems, the Elovich and BET models had the best adjustment, obtaining maximum adsorption capacity of 0.39 mmol·g⁻¹ for Cd²⁺ and 0.48 mmol·g⁻¹ for Cu²⁺, and the adsorption process was spontaneous and endothermic. With regard to bicomponent systems, a model was developed in order to predict the evolution and equilibrium of kinetics. BPS had regeneration potential after desorption. These results demonstrate the viability of the use of BPS for the adsorption of Cd²⁺ and Cu²⁺ in both systems.

摘要

本研究评估了花生壳生物炭 (BPS) 在单组分和双组分系统中对 Cd ²⁺和 Cu ^{2+的吸附效率。}表征表明 BPS 是介孔和无定形的，具有羟基和羧基官能团，pH _PZC为 7.9。考察了pH、搅拌速度和吸附剂用量的影响，在pH 5.9、200 rpm和2 g·L ^-1条件下获得了最好的结果。在单组分体系中，Elovich 和 BET 模型的调整效果最好，Cd ^{2+的最大吸附容量为 0.39 mmol·g -1}，Cu ²⁺的最大吸附容量为0.48 mmol·g ^-1, 吸附过程是自发的和吸热的。关于双组分系统，开发了一个模型来预测动力学的演变和平衡。BPS在解吸后具有再生潜力。这些结果证明了在两个系统中使用 BPS 吸附 Cd ²⁺和 Cu ^{2+的可行性。}