粉煤灰源分子筛的制备及其氨氮吸附性能探究
Exploration on the Preparation of Molecular Sieve from Fly Ash Source and Its Adsorption Properties of Ammonia Nitrogen
冯颖瑄 1胡谟盛 1徐毅楠 1梁廷君 1金城安 1张连阳2
作者信息
- 1. 绍兴文理学院 化学化工学院,浙江 绍兴 312000
- 2. 绍兴文理学院 浙江省清洁染整技术研究重点实验室,浙江 绍兴 312000
- 折叠
摘要
通过碱熔融-水热合成法,以固体废弃物粉煤灰制备NaA型沸石分子筛,再以简单的离子交换法改性制备了CaA型沸石分子筛.结合X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、比表面测试(BET法)等现代分析表征手段,对两种A型分子筛的形貌和结构进行表征,分析了等温线吸附过程并从吸附动力学角度探讨两种分子筛的吸附机理.结果显示,两种分子筛对氨氮的最佳吸附条件是温度为 25℃,pH为 6～7,分子筛投加量为 150 mg,吸附时间为 40 min;NaA型和CaA型分子筛对水中氨氮的吸附与准二级动力学和Freundlich模型拟合度更高,吸附以离子交换为主,该过程主要是多层吸附.此外,再生实验数据表明,两种分子筛的再生效率均在 95%以上,显示良好的循环稳定性,具有重要的潜在工业应用价值.
Abstract
NaA zeolite molecular sieve was prepared from solid waste fly ash by alkali melting-hy-drothermal synthesis method,and then CaA zeolite molecular sieve was modified by simple ion exchange method.Combined with modern analytical methods such as X-ray diffraction(XRD),scanning electron mi-croscopy(SEM),transmission electron microscopy(TEM)and specific surface area testing(BET method),the morphology and structure of the two A-type molecular sieves were characterized,the isotherm adsorption process was analyzed,and the adsorption mechanism of the two molecular sieves was discussed from the per-spective of adsorption kinetics.The results show that the optimal adsorption conditions for ammonia nitrogen by the two molecular sieves are as follows:temperature of 25℃,pH of 6～7,molecular sieves dosage of 150 mg,and adsorption time of 40 min.In addition,the regeneration experimental data show that the regeneration efficiency of the two molecular sieves is above 95%,showing good cycling stability and having important po-tential industrial application value.
关键词
粉煤灰/沸石分子筛/吸附/氨氮/去除率Key words
fly ash/zeolite molecular sieve/adsorption/ammonia nitrogen/removal rate引用本文复制引用
基金项目
浙江省公益技术研究项目(LGC20B050008)
绍兴文理学院校级科研项目(2021LG010)
出版年
2024
NETL
NSTL
万方数据