Abstract

Batch sorption experiments were performed to investigate the potential of Bauhinia variagata fruit (BVf) and nano-magnetic Bauhinia variagata fruit (nM-BVf) to remove methylene blue (MB) and malachite green (MG). Equilibrium studies have been carried out using various experimental parameters such as the amount of biosorbent, initial solution concentration, contact time, pH, and temperature. The Langmuir, Freundlich, Scatchard, D-R and Temkin adsorption models were applied for the experimental information of MB and MG. The Freundlich model fits better than the Langmuir model. Freundlich model confirmed the magnificent dye sorption ability; 19.3 mg/g for BVf/MB, 21.2 mg/g for nM-BVf/MB, 19.7 mg/g for BVf/MG, and 30.1 mg/g for nM-BVf/MG. The pseudo-second-order kinetic model displayed a more suitable behavior to the experimental result for the removal of MG and MB. Thermodynamic parameters such as changes in Gibbs free energy (ΔG^o), enthalpy (ΔH^o), and entropy (ΔS^o) were investigated and the fine details in the adsorption system were completed. The conclusion from this study is that the prepared nano biosorbent can be efficient for the removal of cationic dyes from wastewater.

摘要

进行批量吸附实验以研究紫荆果实（BVf）和纳米磁性紫荆的潜力水果 (nM-BVf) 去除亚甲基蓝 (MB) 和孔雀石绿 (MG)。平衡研究已使用各种实验参数进行，例如生物吸附剂的量、初始溶液浓度、接触时间、pH 和温度。Langmuir、Freundlich、Scatchard、DR 和 Temkin 吸附模型应用于 MB 和 MG 的实验信息。Freundlich 模型比 Langmuir 模型更适合。Freundlich 模型证实了强大的染料吸附能力；BVf/MB 为 19.3 mg/g，nM-BVf/MB 为 21.2 mg/g，BVf/MG 为 19.7 mg/g，nM-BVf/MG 为 30.1 mg/g。准二级动力学模型对去除MG和MB的实验结果表现出更合适的行为。热力学参数，例如吉布斯自由能的变化（Δ G ^o)、焓 (Δ H ^o ) 和熵 (Δ S ^o ) 进行了研究，并完成了吸附系统中的细节。本研究的结论是，制备的纳米生物吸附剂可以有效去除废水中的阳离子染料。