基于吸附废水中酸性湖蓝A的麦糟改性研究

Modification of spent grains to improve acid turquoise blue A adsorption from wastewater

摘要: 为更好地去除废水中的酸性湖蓝 A，本实验分别采用 HCl、NaOH、AlCl₃ 和 CH₃COONH₄ 为改性剂对麦糟进行改性研究.结果表明，30 ℃温度条件下，用 0.8 mol/L 的 AlCl₃ 溶液处理 12 h 的改性麦糟，对 pH 值为 3 酸性湖蓝 A 溶液有最好的吸附能力，脱色率达 98.9 %，改性麦糟的吸附量为 19.78 mg/g.并通过傅里叶变换红外光谱分析、动力学分析研究麦糟的改性机理，发现经 AlCl₃ 改性后的麦糟新增 N-Cl、C-Cl 等活泼基团，增强了麦糟的吸附能力，且吸附过程符合准二级动力学模型.

Abstract: In order to adsorb acid turquoise blue A from wastewater, HCl、NaOH、AlCl₃ and CH₃COONH₄ were used as modifiers for spent grains modification. The results show that spent grains modified by 0.8 mg/L AlCl₃ 12 h at 30 ℃ have the best adsorption for acid turquoise blue A whose solution pH is 3, with eff iciency of 98.9% and capacity of 19.78 mg/g. The mechanism of spent grains modification was studied through Fourier Transform Infrared Spectroscopy (FTIR) and kinetics study. The study indicates that the newly added active function groups such as N-Cl and C-Cl after AlCl₃ modification increase the adsorption capacity, and its adsorption process conforms to the pseudo-second-order kinetics model.