Adsorption of fluoride from aqueous solution by fly ash cenospheres modified with paper mill lime mud: Experimental and modeling

被引：44

作者：

Ye, Changwen ^{[1
,2
]}

Yan, Bowen ^{[2
]}

Ji, Xing ^{[2
]}

Liao, Bing ^{[1
,2
]}

Gong, Rui ^{[2
]}

Pei, Xiangjun ^{[1
,2
]}

Liu, Guo ^{[1
,2
]}

机构：

[1] Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Sichuan, Peoples R China

[2] Chengdu Univ Technol, State Environm Protect Key Lab Synerget Control &, Chengdu 610059, Sichuan, Peoples R China

来源：

ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY | 2019年 / 180卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Adsorption; Fluoride; Modification; Fly ash cenospheres; Paper mill lime mud; SURFACE COMPLEXATION; URANIUM(VI) ADSORPTION; REMOVAL; WATER; DEFLUORIDATION; SORPTION; IONS; OPTIMIZATION; GROUNDWATER; DISSOLUTION;

D O I：

10.1016/j.ecoenv.2019.04.086

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Fluoride removal from aqueous solution by adsorption using fly ash cenospheres (FAC) modified with paper mill lime mud (LM) as composite adsorbent had been investigated. The characterization of FAC and composite adsorbent were analyzed by Scanning electron spectroscope (SEM), Energy dispersive spectrometer (EDS), Brunauer emmett teller (BET) and Fourier transform infrared (FTIR), which demonstrated that the porous structure of composite adsorbent was obtained after surface modification. Adsorption of fluoride on modified fly ash cenospheres was fitted with pseudo-second-order model and Langmuir model. Response surface methodology (RSM) was employed to investigate the effects of F- concentration, pH, adsorbent dosage and temperature on the removal efficiency. Analysis of variance (ANOVA) was used to test the adequacy of the mathematical models. The Nonelectrostatic model of modified fly ash cenospheres adsorbing fluoride was built through the Generalized composite method, indicating that two inner-spherical complexes, equivalent to SF and equivalent to SOHF-, were formed in the adsorption process by means of the ligand exchange and surface complexation. Optimization of the adsorption conditions enabled the realization of the practical needs for fluoride contaminated water.

引用

页码：366 / 373

页数：8

共 45 条

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