改性沸石对水中铬酸盐的吸附和解吸性能研究

以溴化十六烷基三甲胺为改性剂制备改性沸石,研究了对水中铬酸根阴离子的吸附性能及影响因素,结果表明,改性沸石对铬酸根的吸附效果良好,实验条件下吸附率在90%以上.绘制了改性沸石对铬酸根阴离子的吸附等温线,其吸附规律较好的符合Langmuir吸附等温式.对吸附平衡的改性沸石进行了解吸实验,以Na2CO3和NaOH的水溶液为洗脱剂可以对铬酸根阴离子有效的解吸,以达到再生的效果并且解吸后的改性沸石经过稀盐酸处理后基本恢复了对铬酸根阴离子起初的吸附能力.

Study of Sorption and Desorption of Chromate in Solutions with Modified Zeolite

Zeolite used in the study was modified by adding hexadecyltrimethylammonuium bromide surfactants. The properties and main influential factors of modified zeolite for adsorption of chromate in the solutions were experimentally investigated. The results showed that removal efficiency of chromate was over 90% under the experimental conditions. As shown from the adsorption isotherm curves of chromate on modified zeolite,the regularity of adsorption fit Langmuir isothermal adsorption model. The desorption of chromate from the modified zeolite with the sorption equilibrium was studied in this paper too. Experimental dated indicated that a combination of Na2CO3 and NaOH, as chromate extractants, had the significant effects on removed of the sorbed chromate from the modified zeolite surfaces and the regenerated modified zeolite in this way with the treatment of diluted hydrochloric acid was still effective for sorption of chromate without noticeable loss of sorption capacity.