柠檬酸改性酒糟对重金属镉的吸附性能

发布时间：2018-03-28 15:19

本文选题：重金属　切入点：改性酒糟　出处：《东南大学学报(自然科学版)》2016年01期

【摘要】：通过柠檬酸对酒糟改性后制备出改性酒糟,系统研究了改性酒糟对水溶液中重金属Cd的吸附性能.研究发现,质量浓度0.5%的柠檬酸改性酒糟对Cd~(2+)的吸附量由改性前的4.09 mg/g提高到9.13 mg/g;酒糟改性后比表面积增大,微孔容积增加,且电负性增强.红外光谱分析表明,经过柠檬酸改性后酒糟有效官能团数目增多.改性酒糟对Cd~(2+)的吸附量随p H值的升高先增加后略有降低,在2 h时达到吸附平衡,吸附饱和后随震荡时间的延长,Cd~(2+)析出量很小.当p H值为6、初始Cd浓度为100 mg/L、改性酒糟投加量为10 g/L、吸附120 min时,改性酒糟对Cd~(2+)的去除率达到91.50%,吸附量为9.15 mg/g.吸附等温线研究表明,Langmuir模型能更好地描述改性酒糟对Cd~(2+)的吸附过程.
[Abstract]:The modified distillers' grains were prepared by citric acid modification. The adsorption properties of modified lees for CD in aqueous solution were systematically studied. The adsorption capacity of citric acid modified distiller's lees for Cd~(2 increased from 4.09 mg/g to 9.13 mg / g, the specific surface area increased, the micropore volume increased and the electronegativity increased after modification. After modified with citric acid, the number of effective functional groups increased. The adsorption capacity of modified distiller's lees for Cd~(2 increased first and then decreased slightly with the increase of pH value, and reached the adsorption equilibrium at 2 h. When pH is 6, the initial CD concentration is 100mg / L, the dosage of modified distiller's grains is 10 g / L, and the adsorption time is 120 min. The removal rate of Cd~(2 from modified distiller's grains was 91.50 and the adsorption capacity was 9.15 mg / g. The adsorption isotherm study showed that the adsorption process of modified distiller's grains on Cd~(2 was better described by the Langmuir model.
【作者单位】：北京科技大学环境工程系;北京科技大学工业典型污染物资源化处理北京市重点实验室;
【基金】：国家水体污染控制与治理科技重大专项资助项目(2015ZX07205003) 中央高校基本科研业务费专项资金资助项目(FRF-TP-15-040A2)
【分类号】：X703.1

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