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为了探索生物质材料酒糟对重金属离子的吸附效果,采用静态吸附实验研究废水pH值、Pb~(2+)和Zn~(2+)初始质量浓度以及吸附时间对酒糟吸附模拟矿山酸性废水中Pb~(2+)和Zn~(2+)的影响.p H值为4时酒糟对Pb~(2+)和Zn~(2+)的吸附量分别达到最高值,酒糟对Pb~(2+)的吸附等温线特征符合Langmuir方程,对Zn~(2+)的吸附等温线特征符合Freundlich方程,对Pb~(2+)和Zn~(2+)的最大吸附量分别为8.29 mg·g-1和15.31 mg·g-1.酒糟对Pb~(2+)和Zn~(2+)的吸附反应在4 h后达到平衡,吸附动力学特征均符合拟二级动力学模型.酒糟中纤维素、半纤维素和木质素的质量分数分别为23.3%、65.5%和0.5%,吸附Pb~(2+)和Zn~(2+)后3种物质的含量发生变化,分别为19.6%、42.3%和2.6%.酒糟电负性随p H值升高呈正比增加,吸附Pb~(2+)和Zn~(2+)后电负性减弱.红外光谱分析结果显示酒糟中参与吸附反应的基团主要有酰胺基和酯基.
In order to explore the adsorption effect of biomass lees on heavy metal ions, static adsorption experiments were carried out to study the effects of pH value, Pb2 +, Zn2 + initial concentration and adsorption time on adsorption of Pb ~ (2+) and Zn ~ (2+) .The adsorption capacity of Pb 2+ and Zn 2+ reached the highest value when the pH value was 4, +) Is in accordance with the Langmuir equation. The adsorption isotherms of Zn 2+ conforms to the Freundlich equation, and the maximum adsorption of Pb 2+ and Zn 2+ is 8.29 mg · g-1 and 15.31 mg · g-1, respectively.The adsorption of Pb 2+ and Zn 2+ by lees reached the equilibrium state after 4 h, and the adsorption kinetics were in accordance with the pseudo second-order kinetics model. The contents of cellulose, hemicellulose and lignin were 23.3%, 65.5% and 0.5%, respectively. The contents of three substances changed after adsorption of Pb 2+ and Zn 2+, which were 19.6 %, 42.3% and 2.6%, respectively.The electronegativity of distillers grains increased in direct proportion to the increase of p H value, the electronegativity decreased after the adsorption of Pb 2+ and Zn 2+ .The results of FTIR showed that Adsorption reaction groups are mainly amide and ester groups.