粉煤灰合成沸石去除废水中铜离子的研究

摘要

Single-phase NaP1 zeolite (ZFA) was synthesized through hydrothermal method (HT) and microwave assisted hydrothermal method(MW) from coal fly ash(CFA) pretreated by Na2CO3 fusion, the effects of pH value and adsorption time on the Cu2+ removal efficiency were investigated. The results showed that the two ZFAs through HT and MW also have high removal efficiency of Cu2+ , at 25 ℃, solution pH value of 6, sorbent dose of 10 g/L, and contact time of 30 min, the Cu2+ removal efficiency is over 95％. The adsorption of Cu2+ on the two ZFAs fits the Langmuir isotherm well and the greatest adsorption capacity of HT-ZFA and MW-ZFA was 70.08 mg/g and 53.30 mg/g.%粉煤灰通过碱熔融预处理,采用水热法(HT)和微波辅助水热法(MW)均合成了单一的NaPl型沸石,研究了溶液pH值和吸附时间对两种沸石产品去除废水中铜离子效果的影响,探讨了沸石产品去除铜离子的吸附机理.研究表明,合成的两种沸石产品对铜离子具有较强的脱除能力,pH值为6,沸石用量10 g/L,吸附30 min时,铜离子去除率均可达95%以上.铜离子的吸附过程符合Langmiur吸附等温方程式,两种沸石产品的静态饱和吸附量分别为70.08 mg/g和53.30 mg/g.