摘要
以盐酸和氯化铁溶液为活性剂,用高温活化的方法将天然斜发沸石进行改性,对模拟含氟废水进行静态吸附试验,研究改性沸石对水中氟化物的吸附性能,考察了沸石粒径、投加量、吸附时间、pH值、初始质量浓度对氟化物处理效果的影响。结果表明,在活化沸石粒径为0.25～0.38 mm,用量为1.0g/100mL,不调节酸碱度的条件下,常温下吸附2 h,氟化物的去除率可达83%。绘制的吸附等温线较好地符合Langmuir吸附等温方程。
As is known, zeolite can be introduced into sewage treatment for its features of large specific surface area and selective adsorption. And, consequently, it has become an emphatic tendency for fluoride to be used as an alternative low-cost potential absorbent for removing impurities from the sewage. This paper is inclined to present our study results on how to use natural zeolite to improve the adsorbent strength in the solution prepared with modified zeolite. To achieve our research purpose, we have experimented with the modification treatment of natural zeolite-clinoptilolite by adding hydrochloric acid and ferric chloride solution as an catalytic agent at high temperatures. In our experiment we have also tested how to remove fluoride from water through static adsorption in a simulated fluorine-laden water. At the same time, we have also made a detailed discussion on the influence of particle size, the modified zeolite dosage, the time length of the adsorption, pH value and the initial solution concentration on the fluoride-removing efficiency. The results of orthogonal experiment indicate that the fluoride-removing efficiency proves to be as high as about 83% on the condition that the particle size of zeolite is 0.25-0.38 mm, the modified zeolite dosage is 1.0 g, in the neutral condition the adsorption time length is 2 h. The study also indicates that, Langmuir equation can favorably associate fluorine ion adsorption equilibrium with the modified zeolite version, and in turn make the adsorption model into a Langmuir one. Furthermore, the uptake equilibrium can best be described by the Langmuir adsorption isotherm. What is more important, we have thoroughly and systemically investigated the modification methods of zeolite-clinoptilolite from Baiyin in this paper while referring to some up-to-date literatures on zeolite modifications. Referring to such literatures, we have determined the optimum modifying conditions, the affecting factors and the modified zeolite adsorption exchange mechanism along with large su
出处
《安全与环境学报》
CAS
CSCD
北大核心
2011年第6期49-52,共4页
Journal of Safety and Environment
关键词
环境工程学
吸附
除氟
改性沸石
吸附等温线
environmental engineering
adsorption
fluoride removal
modified zeolite
adsorption isotherm
