活性炭的改性研究及对四环素的吸附

Modification of Activated Carbons and Their Adsorption Properties to Tetracycline

研究了改性对活性炭的物理化学性质及其对四环素吸附性能的影响。结果发现,硝酸氧化改性可增加活性炭表面的酸性基团,提高比表面亲水性,降低pHPZC值,同时也改变了活性炭的表面微观形貌。低温、低浓度硝酸氧化改性,增加了活性炭的比表面积,对四环素的吸附以物理吸附为主。高温氧化改性使得比表面积降低,酸性基团增加,且吸附容量与活性炭比表面积、表面总酸度呈一定的线性关系。

The influence of surface modification on the physical and chemical properties of ACs and their adsorption properties to tetracycline were investigated. The results showed that the acid surface functional groups of activated carbon increased after oxidation with nitric acid, and became more hydrophilicity with low pHpzc value, and the nitric acid had obvious effects on the morphology of the ACs. Low concentration of nitric acid modified ACs at low temperature possessed the higher surface area, the physical adsorption to tetracycline is the leading function; modified ACs at high temperature possessed the lower surface area, the chemical adsorption to tetracycline cooperated with the physical adsorption, and the adsorption capacity significantly increased.