Study on adsorption characteristics of activated carbon to leaded wastewater
活性炭对含铅废水吸附特性研究

Activated carbons were used to adsorb the divalent lead ions in wastewater by a static method in order to study the absorption characteristics. The results showed that the absorption equilibrium time was 100 min. The adsorption isotherm equation was C_e/q_e = 0. 4298 +0. 0594C_e ( 25 ℃) , and the equation was consistent with the Langmuir absorption model. The adsorption equation parameters ( R_L) , which were between 0 and 1 at different temperatures, proved that adsorption was beneficial to process. The experiment was well fitted by math-ematical model with the secondary correlation coefficient ( R~2 ) being 0. 9998. Meanwhile the adsorption was con-firmed as a spontaneous endothermic process by the results of △H~θ＞0 and △G~θ ＜0 at different temperatures; and the order reduced and the chaos increased of the divalent lead ions in the solid - liquid interface with △S~θ ＞ 0. In addition, small value of △H~θ showed that the absorption was a physical process.