以粉煤灰为原料,采用固相法合成NaA型粉煤灰沸石.通过静态吸附实验,研究了吸附时间、pH值、溶液浓度以及吸附温度对粉煤灰沸石吸附脱除亚甲蓝性能的影响.通过SME、XRD对产品进行表征,探讨了亚甲蓝在粉煤灰沸石上的吸附行为.结果表明:经XRD分析,合成产物主要为NaA型沸石.SEM分析表明,产物分别具有纺锤体及NaA型沸石立方体骨架结构;在吸附温度25 ℃,pH值>5,粉煤灰沸石投加量8 g·L-1,吸附30 min时,NaA型沸石对初始浓度为50~100 mg·L-1的亚甲蓝去除率均可达90%以上,较粉煤灰提高了45%;与商品沸石的吸附性能相当.合成的粉煤灰沸石吸附亚甲蓝过程符合Langmuir模型,其为单分子层吸附.
Fly ash zeolite was synthesized by solid transformation method with coal fly ash.The effects of adsorption time, pH value and concentration of methylene blue (MB) solution, and adsorption temperature on the zeolite adsorption performance of MB were discussed by static adsorption experiment.The synthetical zeolite was characterized by means of SME and XRD.The results show that the synthetic product is NaA zeoite with hetero crystal by analysis of XRD.Analysis of SEM show that the product has spindle structure and cubic structure of NaA zeolite respectively.The removal rate of NaA zeolite can reach more than 90% for the initial concentration of 50-100 mg·L-1 of MB and it was 45% higher than fly ash at the adsorption temperature 25 ℃, pH>5, fly ash zeolite dosage 8 g·L-1, adsorption time 30 min.It is equivalent to commercial zeolite.The process about fly ash zeolite adsorb methylene blue conformed to the Langmuir model which is single molecular layer adsorption.
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