Functional iron chitosan microspheres synthesized by ionotropic gelation for the removal of arsenic (V) from water

被引:29
|
作者
Lobo, Cintia [1 ]
Castellari, Josefina [1 ]
Colman Lerner, Jorge [2 ]
Bertola, Nora [1 ]
Zaritzky, Noemi [1 ,3 ]
机构
[1] UNLP, Ctr Invest & Desarrollo Criotecnol Alimentos CIDC, Fac Ciencias, Exactas,CONICET, Calle 47 Y 116,B1900AJJ, La Plata, Argentina
[2] Ctr Invest & Desarrollo Ciencias Aplicadas CINDEC, Calle 47 257,B1900AJJ, La Plata, Argentina
[3] UNLP, Fac Ingn, B1900AJJ,Calle 47 Y 1, La Plata, Argentina
关键词
Arsenic; Chitosan; Iron; Adsorption; Water; AQUEOUS-SOLUTION; AS(III) REMOVAL; BEADS; EQUILIBRIUM; ADSORPTION; COMPOSITE; MEMBRANE; SORPTION; OXIDE; NANOMATERIALS;
D O I
10.1016/j.ijbiomac.2020.07.253
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Arsenic (As) is considered one of the most serious inorganic contaminants in groundwater. The maximum limit of As in drinking water is 0.010mg As L-1 according to the World Health Organization. Functional Iron Chitosan Microspheres (F-ICM) were synthesized by ionotropic gelation of chitosan and ferric nitrate for removal of As (V) from water. The effects of iron concentration (0.7, 5.5 and 11.2gFe(+3)/100g chitosan), pH range (4-9), sorbent dosage, possibility of reuse and presence of interfering anions were analyzed. F-ICM were effective for As (V) adsorption in a wide range of pH with removals higher than 88.9%, reaching concentrations < 0.010mgAs L-1. A higher proportion of iron in the matrix favored the removal of As(V) in a pH range 6 to 9. Kinetic data of As(V) adsorption onto 0.7 F-ICM under all tested initial concentrations fitted well with the pseudo second-order kinetic model. Sorption isotherm experimental data were satisfactorily fitted with the Langmuir equation; the maximum sorption capacity for As(V) was 120.77mgAs(V) (gF-ICM1) and the Langmuir constant was 0.331 L mg(1). A good performance of the adsorption capacity was obtained in four successive adsorption cycles of reuse and in the presence of interfering anions, indicating the high adsorption capacity of the synthesized microspheres. (C) 2020 Published by Elsevier B.V.
引用
收藏
页码:1575 / 1583
页数:9
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