High efficient As(III) removal by self-assembled zinc oxide micro-tubes synthesized by a simple precipitation process
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Zinc oxide (ZnO) micro-tubes via self-assembly of nanoparticles were synthesized by a simple precipitation process. Removal of As(III) (arsenite) from water by ZnO micro-tubes through adsorption was investigated with both lab-prepared and natural water samples. The result showed that these self-assembled ZnO micro-tubes are effective to remove As(III) from both lab-prepared and natural water samples at near neutral pH environment. These ZnO micro-tubes have a high adsorption capability on As(III) at low As(III) concentration. When the equilibrium As(III) concentration was around 0.1 mg/L, the amount of As(III) adsorbed at equilibrium was over 10 mg/g. At high equilibrium concentration, the adsorption capacity of these ZnO micro-tubes on As(III) reached over 39.4 mg/g. These ZnO micro-tubes could provide a simple single-step treatment option to treat arsenic-contaminated natural water, which requires no pre-treatment or post-treatment pH adjustment for current industrial practice.
KeywordsArsenic Arsenic Species Field Emission Scanning Electron Microscopy Image Adsorption Performance Natural Water Sample
This study was supported by the National Basic Research Program of China, Grant No. 2006CB601201, the Knowledge Innovation Program of Chinese Academy of Sciences, Grant No. Y0N5711171, and the Knowledge Innovation Program of Institute of Metal Research, Grant No. Y0N5A111A1.
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