金属负载活性炭的亚甲基蓝/单宁酸吸附性能

摘要

考察了亚甲基蓝和单宁酸在金属负载活性炭表面的吸附行为,并用Langmuir与Freundlich方程对等温吸附线进行拟合。结果表明,亚甲基蓝在活性炭表面倾向于多分子层吸附,而单宁酸则倾向于单分子层吸附;金属负载降低了活性炭对有机污染物的饱和吸附容量,但新建的金属氧化物活性中心可促进单宁酸在低浓度下的吸附。金属负载改性是饮用水深度处理中活性炭滤料改性的重要方向。%The adsorption performances of methylene blue and tannic acid on activated carbon(AC)modified by metal coating were investigated.The adsorption isotherms of the two organic pollutants with different molecular weight and polarity were fitted by equation Langmuir and Freundlich,respectively.Results indicate that the adsorption of methylene blue on AC is inclined to multilayer adsorption,but that of tannic acid is inclined to monolayer adsorption.The modified technology with metal salts reduced the saturated adsorption capacity of organic pollutant on AC,but the new active sites of metal oxides can promote adsorption process under low concentration of pollutants.The modified technology with metal salts is an important modification direction for the AC filter materials in drinking water treatment.