摘要
采用NaCl-MnO2联合的方式对天然斜发沸石进行改性,在静态条件下,对改性斜发沸石处理模拟含锌废水进行了试验研究,考察了吸附时间、吸附剂投量、Zn^2＋初始浓度和pH对改性斜发沸石吸附Zn^2＋的影响。结果表明：当温度为25℃、pH为5.0～6.0、Zn^2＋初始浓度≤50 m g/L时,按锌与改性斜发沸石质量比为1：40投加改性斜发沸石进行处理,Zn^2＋去除率可达90%以上,模拟含锌废水经改性沸石处理后,水中锌含量低于国家排放标准。改性斜发沸石对Zn^2＋的吸附规律符合Langm uir吸附等温线和准二级动力学模型,相关系数分别为0.927 5和0.999 2。
Natural clinoptilolite was modified by NaCl-MnO2.The treatment of zinc-containing wastewater by modified clinoptilolite was studied under static state.The efficiency of adsorption time,modified clinoptilolite dosage,initial concentration of Zn^2＋ and pH on Zn^2＋ adsorption were investigated.The results show that removal efficiency of Zn^2＋ is over 90 % when the quality ratio of zinc to modified clinoptilolite is 1：40,the concentration of Zn^2＋ is less than 50 mg / L,pH is 5-6 and temperature is 25 ℃ in the wastewater.The adsorption law conforms to Langmuir adsorption isotherm and pseudo-second-order kinetic,correlation coefficient are 0.927 5 and 0.999 2,respectively.
出处
《净水技术》
CAS
2011年第2期42-45,共4页
Water Purification Technology
关键词
改性斜发沸石
ZN^2+
吸附
废水处理
modified clinoptilolite Zn^2＋ adsorption wastewater treatment
