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Adsorption characteristics of trace levels of bromate in drinking water by modified bamboo-based activated carbons
This study was undertaken to investigate the adsorption kinetics and isotherms of bromate (BrO3−) on bamboo charcoals that are activated with nitrogen and water vapor. Bamboo-based activated carbon (AC) was dipped in acid and oxidized in a mixture of potassium permanganate and sulfuric acid. Oxidation treatment considerably improved the physicochemical properties of AC, including purity, pore structure and surface nature, significantly enhancing BrO3− adsorption capacity. AC with many oxygenated groups and a high mesopore volume exhibited a particularly favorable tendency for BrO3− adsorption. Its adsorption of BrO3− is best fitted using Langmuir isotherm, and forms a monolayer. A kinetic investigation revealed that the adsorption of BrO3− by the ACs involved chemical sorption and was controlled by intra-particle diffusion. The competitive effects of natural organic matter (NOM) on AC were evaluated, and found to reduce the capacity of carbon to adsorb BrO3−. Residual dissolved ozone reacted with AC, reducing its capacity to absorb BrO3−. Proper dosing and staging of the ozonation processes can balance the ozone treatment efficiency, BrO3− formation, and the subsequent removal of BrO3−.
Adsorption characteristics of trace levels of bromate in drinking water by modified bamboo-based activated carbons
This study was undertaken to investigate the adsorption kinetics and isotherms of bromate (BrO3−) on bamboo charcoals that are activated with nitrogen and water vapor. Bamboo-based activated carbon (AC) was dipped in acid and oxidized in a mixture of potassium permanganate and sulfuric acid. Oxidation treatment considerably improved the physicochemical properties of AC, including purity, pore structure and surface nature, significantly enhancing BrO3− adsorption capacity. AC with many oxygenated groups and a high mesopore volume exhibited a particularly favorable tendency for BrO3− adsorption. Its adsorption of BrO3− is best fitted using Langmuir isotherm, and forms a monolayer. A kinetic investigation revealed that the adsorption of BrO3− by the ACs involved chemical sorption and was controlled by intra-particle diffusion. The competitive effects of natural organic matter (NOM) on AC were evaluated, and found to reduce the capacity of carbon to adsorb BrO3−. Residual dissolved ozone reacted with AC, reducing its capacity to absorb BrO3−. Proper dosing and staging of the ozonation processes can balance the ozone treatment efficiency, BrO3− formation, and the subsequent removal of BrO3−.
Adsorption characteristics of trace levels of bromate in drinking water by modified bamboo-based activated carbons
Chen, Ho-Wen (author) / Chuang, Yen Hsun (author) / Hsu, Cheng-Feng (author) / Huang, Winn-Jung (author)
Journal of Environmental Science and Health, Part A ; 52 ; 1055-1062
2017-09-19
8 pages
Article (Journal)
Electronic Resource
English
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