期刊：
Korean Journal of Chemical Engineering,2018年35(8):1636-1641 ISSN：0256-1115
通讯作者：
Zhou, Kanggen
作者机构：
[Chen, Wei; Wang, Aihe; Liu, Xing; Chen, Quanzhou; Zhang, Chun; Liu, Fang; Zhou, Kanggen] Cent S Univ, Inst Environm Sci & Engn, Sch Met & Environm, Lushan South Rd 932, Changsha 410083, Peoples R China.;[Wang, Aihe] Hunan City Univ, Sch Municipal & Mapping Engn, Yingbin East Rd 518, Yiyang 413000, Hunan, Peoples R China.
通讯机构：
[Zhou, Kanggen] C;Cent S Univ, Inst Environm Sci & Engn, Sch Met & Environm, Lushan South Rd 932, Changsha 410083, Peoples R China.
关键词：
Metal Composite Oxides;Calcium Alginate;Fluoride;Adsorption Isotherm;Adsorption Kinetic;Regeneration
摘要：
Batch experiments were conducted to study the adsorption performance of fluorine removal by the calcium alginate (SA) embedded by the composite Mg-Al-Ce oxides (SA-CMAC). The physical and chemical properties of the SA-CMAC were characterized by XRD, SEM and XPS analysis. The optimum conditions for fluoride removal were determined and the maximum adsorption capacity was 26.12mg g−1. The co-existing PO
4
3−
and CO
3
2−
anions in solution had more effect than the SO
4
2−
and NO
3
-
on the fluoride removal efficiency. The adsorption process of fluorine by SA-CMAC was attributed to ion exchange on the surface of the SA-CMAC. The experimental data fitted both the isotherms and Freundlich well, and the Freundlich model had a little higher correlation coefficient. As the rate determining step, the adsorption process could be best described by the pseudo-second order kinetic model followed by the intra-particle diffusion. The thermodynamic examination demonstrated that the fluoride adsorption on the SA-CMAC beads was reasonably spontaneous and exothermic. The reclaimed adsorbents still could adsorb 65% of the total fluoride in the solution after three cyclic processes using 0.01mol/L NaOH.
