合成沸石对重金属离子Ni^(2+)、Pb^(2+)、Cu^(2+)的吸附性能  

Adsorption of Heavy Metal Ions Ni^(2+),Pb^(2+) and Cu^(2+) by Synthesized Zeolite

作　　者：程婷[1] 陈晨[2] 干方群[1] 许文静[1] 

机构地区：[1]江苏城市职业学院城市科学系,南京210017 [2]江苏科技大学环境与化学工程学院,江苏镇江212018

出　　处：《湖北农业科学》2016年第24期6413-6417,共5页Hubei Agricultural Sciences

基　　金：国家自然科学基金项目(21407068);江苏省环境工程重点实验室科研开放基金项目(KF2014002;KF2015011);江苏省高校自然科学研究项目(14KJD610002;14KJB610003);江苏省高校大学生创新训练计划项目(201614000005Y)

摘　　要：利用合成沸石吸附混合重金属Ni^(2+)、Pb^(2+)、Cu^(2+),考察吸附剂量、初始pH、反应时间对其竞争吸附效果的影响,探讨沸石吸附等温线和吸附动力学。结果表明,吸附剂量、初始pH、反应时间对沸石吸附Ni^(2+)、Pb^(2+)、Cu^(2+)的吸附效果影响较大。随着沸石投加量增大,其对Ni^(2+)、Pb^(2+)、Cu^(2+)的吸附去除率逐渐上升,而单位质量吸附剂对3种重金属饱和吸附量呈下降趋势。沸石对3种重金属离子的竞争吸附去除顺序为Pb>Cu>Ni。初始pH为强酸性环境不利于Ni^(2+)、Pb^(2+)、Cu^(2+)吸附,其吸附去除率均低于20%;不同初始pH,沸石对Pb^(2+)吸附效果最好。随着反应时间延长,沸石对Ni^(2+)、Pb^(2+)、Cu^(2+)吸附去除率逐步提高;不同反应时间下,沸石对3种重金属的吸附去除顺序不变。沸石吸附Ni^(2+)与Cu^(2+)的过程符合Freundlich吸附等温式,对Pb^(2+)的吸附过程符合Langmuir吸附等温式。准二级吸附动力学方程能够描述沸石对Ni^(2+)、Pb^(2+)、Cu^(2+)的吸附行为。The experiments were conducted to examine the adsorption of mixed heavy metals Ni^（2＋）,Pb^（2＋）and Cu^（2＋）ions through synthesizing zeolite. The adsorbent dosage, initial pH and reaction time were investigated to study the competitive adsorption effect of these three ions. The adsorption isotherm and kinetics equation was also discussed. The results showed that the adsorbent dosage,initial pH and the reaction time had significant effect on the removal of Ni^（2＋）,Pb^（2＋）and Cu^（2＋）ions. With the increasing of adsorbent dosage,the adsorption removal rate of Ni^（2＋）ions,Pb^（2＋）and Cu^（2＋）ions was improved,and the saturated adsorption capacity showed a decreasing tendency. The competitive adsorption sequence of these three heavy metal ions was PbCuNi. The adsorption removal rate was lower than 20% while the initial pH of a strongly acidic environment,which was not suitable for the adsorption of Ni^（2＋）,Pb^（2＋）and Cu^（2＋）ions. The adsorption effect of Pb^（2＋）ions was best at initial pH8. With the increasing of reaction time,the adsorption removal rate of Ni^（2＋）,Pb^（2＋）and Cu^（2＋）ions was improved continuously. The adsorption removal order of these three heavy metal ions was unchanged at different reaction time. The adsorption process of Ni^（2＋）and Cu^（2＋）ions accorded with Freundlich adsorption isotherm, while the adsorption process of Pb^（2＋）ions accorded with Langmuir adsorption isotherm. In addition, the reaction of adsorption on zeolite to Ni^（2＋）,Pb^（2＋）and Cu^（2＋）ions matched to the pseudo-second class reaction kinetics model.

关 键 词：粉煤灰 重金属 沸石 竞争吸附 

分 类 号：X52[环境科学与工程—环境工程] X773