不同pH值条件下重金属Pb^(2+)的吸附解吸研究

Effect of pH Level on Adsorption Characteristics of Pb^(2+)

采用1次平衡法研究了不同pH值条件下重金属Pb2+的吸附解吸特性。研究结果表明,吸附量随平衡浓度的增加而增大,随pH值的升高而增大。初始浓度为100mgL-1和pH值为7分别为初始浓度和pH值的变化敏感阈值。解吸量随吸附量的增加而增大,解吸量随吸附量变化而变化的幅度随pH值的增大而减小。解吸量随pH值的增大而减小。解析率大小顺序为:pH=3>pH=5>pH=7>pH=9>pH=11。

The balance method was used to study the adsorption-desorption of Pb2＋ under the condition of different pH levels.The results showed that the adsorption capacity increased with the balance concentration,and increased with the pH values.Initial concentration of 100 mg L-1 and pH of 7 were the threshold of sensitive change.Desorption quantity increased with adsorption capacity,and the amplitude decreased with pH valudes.Desorption quantity decreased with pH values.And the order of desorption rate was：pH=3pH=5pH=7pH=9pH=11.