向日葵秸秆活性炭对Cr^(6+)吸附研究

Adsorption Studies of Cr(VI)on Activated Carbon from Sunflower Stalk

以向日葵秸秆为原料用浓磷酸改性后制成向日葵秸秆活性炭,研究了pH对向日葵秸秆活性炭对Cr(Ⅵ)溶液吸附效果,并讨论了吸附过程的动力学特征。结果表明:Cr(Ⅵ)溶液pH为2.0,去除效果最佳;升高温度有利于吸附,秸秆活性炭对Cr(Ⅵ)的吸附过程更符合Dubinin-Radushkevick吸附方程,且受温度影响很大。

As the sunflower stalk as raw material made of sunflower stalk activated carbon modified by concentrated phosphoric acid,The adsorption effect of Cr(VI)solution by Sunflower stalk active carbon Was studied under different pH,Discussed the kinetic characteristics of the adsorption process.The results show that:Cr(Ⅵ)solution adjusting the solution pH to2.0,have the optimal removal efficiency;increasing temperature favors the adsorption.Straw of activated carbon on the adsorption process of Cr(Ⅵ)more in line with the Dubinin-Radushkevick adsorption equation.