期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 28, 期 32, 页码 44064-44078出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-021-13788-8
关键词
Attapulgite; Chitosan; Cadmium ions; Orthogonal test; Efficient adsorption; Aqueous phase
资金
- Natural Science Foundation of Jiangsu Province [BK20191337]
- National Science and Technology Major Project [2017ZX07203001]
- Environmental Protection Research Project of Jiangsu Province [2019007]
This study focused on improving the adsorption capacity of Cd2+ from the aqueous phase by using attapulgite and chitosan as raw materials and optimizing the experimental parameters. The results showed that the newly prepared adsorbent had a maximum Cd2+ adsorption amount of 109.30 mg/g, and the adsorption mechanism involved complexation, ion exchange reaction, and self-polarization.
This work focused on using attapulgite and chitosan as raw materials to improve the adsorption capacity of Cd2+ from the aqueous phase by optimizing the preparation experimental parameters. The modification parameters (attapulgite-chitosan mass ratio, calcination temperature, and time) were specifically studied and optimized. The results indicated that the mass ratio of attapulgite to chitosan was 1:4, the calcination temperature was 300 degrees C, and the calcination time was 1 h. Both raw and functionalized attapulgite samples were characterized by nitrogen adsorption-desorption isotherms at 77 K, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and zeta potential analysis. A series of adsorption experiments showed that the pseudo-second-order kinetic model and Langmuir adsorption isotherm better corresponded with the adsorption characteristics of the newly prepared adsorbent, and the maximum adsorption amount of Cd2+ was 109.30 mg/g. Moreover, the effects of the pH value and coexisting cations on the Cd2+ adsorption in aqueous solution were investigated. Adsorption mechanism of Cd2+ on adsorbent might attribute to complexation, ion exchange reaction, and self-polarization.
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