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研究了Zn~(2+)、Cd~(2+)在腐植酸上的吸附动力学及其解吸特征。考察了初始p H与温度对吸附作用的影响。结果表明,金属离子的吸附量随初始p H的升高而增大,随温度升高而增大。Z n~(2+)、C d~(2+)在腐植酸上的吸附符合伪二级吸附速率模型。吸附在腐植酸上的Z n~(2+)、Cd~(2+)在H_2O、HCl、NaOH和NaCl溶液中的解吸量的关系是:HCl>NaOH>NaCl>H_2O。
The adsorption kinetics and desorption characteristics of Zn ~ (2 +) and Cd ~ (2+) on humic acid were studied. The effect of initial pH and temperature on the adsorption was investigated. The results show that the adsorption amount of metal ions increases with the initial p H and increases with the increase of temperature. The adsorption of Z n ~ (2 +), C d ~ (2+) on humic acid conformed to the pseudo second-order adsorption rate model. The relationship between the desorption amount of Z n ~ (2 +) and Cd ~ (2+) adsorbed on humic acid in H 2 O, HCl, NaOH and NaCl solution is: HCl> NaOH> NaCl> H_2O.