摘要
利用粉煤灰合成Linde type F(K)沸石吸附Cu2+、Ni2+、Pb2+、Zn2+混合重金属离子,研究初始浓度对沸石竞争吸附四种重金属离子的影响,探讨沸石吸附混合重金属离子的吸附动力学。结果表明,重金属离子的竞争吸附顺序、沸石对重金属离子的吸附量以及去除率均受初始浓度的影响显著。初始浓度为50 mg/L与100 mg/L时,沸石对Pb2+与Cu2+的竞争吸附能力较强;而初始浓度提升至200 mg/L与300mg/L时,沸石对Zn2+与Pb2+的竞争吸附能力较强,吸附量大小顺序为Zn2+、Pb2+、Ni2+、Cu2+。除Cu2+以外,沸石对Pb2+、Ni2+、Zn2+三种重金属离子的平衡吸附量均随初始浓度的上升而提高。此外,沸石对Cu2+、Ni2+、Pb2+、Zn2+四种重金属离子的吸附行为均符合准二级动力学方程。
The experiment was conducted to examine the adsorption of mixed heavy metals Cu^2＋, Ni^2＋, Pb2＋and Zn^2＋through synthesizing Linde type F（K） zeolite from coal fly ash. The initial concentration was investigated to study the competitive adsorption of mixed heavy metal ions. The equation of adsorption kinetics was established in the test. The results showed that the initial concentration had a significant effect on the sequence of competitive adsorption, the adsorption capacity and the removal rate of mixed heavy metal ions. When the initial concentration was 50 mg / L and 100 mg / L, the selective adsorption ability of Pb2 ＋and Cu2 ＋by synthetic zeolite was better. However, the selective adsorption ability of Zn2 ＋and Pb2 ＋became greater when the initial concentration increased to 200 mg / L and 300 mg / L. The order of competitive adsorption for heavy metal ions was Zn^2＋Pb2＋Ni^2＋Cu^2＋. The equilibrium adsorption capacity of Pb2＋, Ni^2＋and Zn^2＋was improved with the initial concentration of mixed heavy metal ions except Cu^2＋. In addition, the reaction of adsorption on synthetic zeolite to Cu^2＋, Ni^2＋,Pb2＋and Zn^2＋matched the model of pseudo-second class reaction kinetics.
出处
《湖北农业科学》
北大核心
2014年第9期2029-2032,2035,共5页
Hubei Agricultural Sciences
基金
江苏省环境工程重点实验室开放基金项目(KF2010007)
江苏省高校自然科学研究项目(10KJB610009
13KJB610005)
江苏科技大学引进人才科研启动项目(35211107)
关键词
粉煤灰
重金属
沸石
竞争吸附
coal fly ash
heavy metal
zeolite
competitive adsorption
