研究了pH值对δ-MnO2对模拟废水中Cd^2+的吸附作用的影响,当pH〈2.3时,吸附率仅为20%,pH〉5时Cd^2+的吸附率在%%以上;吸附过程为非特性吸附,可以用Elovich方程和双速率方程来描述。吸附后δ-MnO2在pH〈2.05时可以有效的解吸,解吸率约为75%。
Effect of pH value was studied for adsorption capability of Cd2. with δ-MnO2. Results indicated that the adsorption strongly relied on pH value. When pH value was below 2.3, adsorption rate of Cd2+ was only 20% while pH value was above 5, adsorption percentages of Cd2+ was above 96%. Sorption kinetics of δ-MnO2 for Cd (Ⅱ) ion was investigated. The data of kinetic experiments were described well with the Elovicb equation and double rate equafion.δ-MnO2 may be effectively desorbed after adsorption Cd2+ at the pH values below 2.05, with desorption rates about 75%.