Removal of Chromium(Ⅲ) from Monoammonium Phosphate Solutions by a Porous Adsorbent of Fluor(calcium silicate) Composites  

作　　者：ZHU Xinhua JIA Xuhong 

机构地区：[1]College of Civil Aviation Safety Engineering,Civil Aviation Flight University of China,Guanghan 618307,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第2期384-392,共9页武汉理工大学学报（材料科学英文版）

基　　金：the National Natural Science Foundation of China(U1633203);the Major Project of the Civil Aviation Administration of China(J2020-108)。

摘　　要：The products of monoammonium phosphate containing Cr^3+resulted in disqualification,and further posed a serious threat to ecological environment and human beings.Herein,the porous adsorbent of fluor(calcium silicate)composites(FCSc)was prepared by hydrothermal method using diatomaceous earth,hydrated lime and additive(NaF)as raw materials,which was characterized and used for the removal of Cr^3+from monoammonium phosphate solutions.The effects of different parameters,such as solution pH,initial Cr^3+concentration,temperature and contact time on the adsorption of Cr^3+onto FCSc were investigated in details.The results indicated that the adsorption process was in agreement with the pseudo-second-order kinetic model and Freundlich isotherm.The spontaneous and endothermic nature of the adsorption process was obtained by analyzing various thermodynamic parameters(△G0,△H0,and△S0).In addition,computational monte carlo simulations between Cr3+ions and FCSc were conducted to elucidate the adsorption mechanism.Such kind of porous adsorbent provided a potential application in the removal of impurities from monoammonium phosphate industry.

关 键 词：fluor(calcium silicate)composites monoammonium phosphate solutions chromium(Ⅲ) REMOVAL monte carlo simulations 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]