矸石基4A型沸石处理含氟废水的应用  

Fluoride Removal from Wastewater Using Zeolite 4A Synthesized from Coal Gangue

作　　者：王倩[1] 卢新卫[1] 

机构地区：[1]陕西师范大学旅游与环境学院,陕西西安710062

出　　处：《城市环境与城市生态》2016年第2期7-10,共4页Urban Environment & Urban Ecology

基　　金：国家自然科学基金项目(41271510);陕西省科技攻关项目(2014K15-01-05)

摘　　要：实验以废物煤矸石为原料,采用分步溶出硅铝的方法,在较短的晶化时间下水热合成出较纯的4A型沸石,其中,晶化时间的延长有利于方钠石的形成。实验应用合成的4A型沸石对NaF模拟含氟废水进行除氟实验,研究不同吸附条件下矸石基4A型沸石的吸附除氟效率。结果表明溶液的初始pH对矸石基4A沸石的除氟吸附效率的影响显著,液固比（溶液与沸石的质量比）对其影响不大,其中,pH的适应范围是4～6。另外,矸石基4A型沸石的除氟过程符合二级动力学模型和Freundlich吸附等温模型,表明该吸附过程是化学吸附及多分子层吸附作用。Zeolite 4A was quickly synthesized from coal gangue by the stepwise method of dissolving silicon and aluminum in the hydrothermal synthesis. In addition, the extended crystallization time was favorable to the formation of sodalite. Then the defluorinating efficiency was explored on Na F simulated fluorine-containing wastewater using the synthetic zeolite. It confirmed that the initial p H had significant influence on the defluorinating efficiency, and the optimal p H range was 4-6. However, the mass ratio of solution to zeolite had little effect. Moreover, the fluoride removal process using zeolite 4A complied with the pseudo-second-order model and the Freundlich isothermal adsorption model, indicating that the adsorption process was a chemical and multilayer adsorption.

关 键 词：煤矸石 合成 4A沸石 除氟 

分 类 号：X703.1[环境科学与工程—环境工程]