壳聚糖基镍铝水滑石的制备及吸附性能The Preparation and Adsorption Properties of Ni-Al Hydrotalcite Based on Chitosan
李秋荣, 薄荔方, 卢弘骁, 王绎涵, 李红营
壳聚糖, Ni-Al水滑石, 氟离子, 吸附Chitosan, NiAl-Hydrotalcite, Fluoride Ion, Adsorption
《Advances in Material Chemistry》, Vol.2 No.2, 2014-04-04
In this study, microwave assisted method was used for preparing chitosan based NiAl-hydrotalcite, and NiAl-hydrotalcites with and without calcination were used in the adsorption of fluoride from aqueous solution. Various conditions such as adsorbent dosage, solution pH value, co-existing interfering ions and calcination temperature etc., were investigated. The adsorption mechanism was studied by contrasting analysis of X-ray diffract pattern and FTIR of as-prepared sample before and after adsorption, and the sample was characterized by TG-DTA and TEM. The results indicated that the structure of chitosan based NiAl-hydrotalcite would be destroyed when the calcination temperature is higher. Adsorption properties of the sample without calcination were better than those of the calcined sample. The lower fluorine ion concentration was beneficial to adsorption of hydrotalcite, when the adsorbent dosage was 0.2 g/L, the removal rate was 85.78%. It had the best removal efficiency when the pH of solution was in the range of 6 to 7, and strong acid and strong base were not conducive to the adsorption of fluoride ion.