一种绿色生物吸附剂在废水中吸附偶氮染料能力的研究

Investigation of the adsorption ability of a green bio-sorbent on azo dye in wastewater

以开心果果壳作为生物吸附剂,研究其去除废水中偶氮染料的能力。通过批次实验研究了吸附时间和染料质量浓度对开心果果壳生物吸附剂吸附能力的影响。结果表明,吸附过程在10 min内即可完成,吸附率随染料质量浓度的增加而降低。采用两参数和三参数吸附模型描述吸附动力学和吸附等温线实验数据。结果表明,准二级模型和Sips模型能较为准确地描述吸附过程。开心果果壳生物吸附剂的最大吸附容量为109.52 mg/g。标准吉布斯自由能为-5.18 k J/mol,表明吸附过程是一个物理的自发过程。

The adsorption ability of pistachio shell as bio-sorbent on azo dye in wastewater was investi?gated.The influence of contact time and dye concentration on the adsorption ability of this bio-sorbent was in?vestigated by batch method.The results showed that the adsorption process was finished within 10 min and the adsorption ratio decreased as the dye concentration increased.Two-parameter and three-parameter ad?sorption models were used to describe the experimental data.The results revealed that the quasi two level model and Sips model could describe the adsorption process more accurately.The maximum adsorption capac?ity of this bio-sorbent was 109.52 mg/g.The standard Gibbs free energy was-5.18 kJ/mol,which indicated that the adsorption process was a physical and spontaneous process.