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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 (BrO 3 − ) 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 BrO 3 − adsorption capacity. AC with many oxygenated groups and a high mesopore volume exhibited a particularly favorable tendency for BrO 3 − adsorption. Its adsorption of BrO 3 − is best fitted using Langmuir isotherm, and forms a monolayer. A kinetic investigation revealed that the adsorption of BrO 3 − 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 BrO 3 − . Residual dissolved ozone reacted with AC, reducing its capacity to absorb BrO 3 − . Proper dosing and staging of the ozonation processes can balance the ozone treatment efficiency, BrO 3 − formation, and the subsequent removal of BrO 3 − .
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 (BrO 3 − ) 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 BrO 3 − adsorption capacity. AC with many oxygenated groups and a high mesopore volume exhibited a particularly favorable tendency for BrO 3 − adsorption. Its adsorption of BrO 3 − is best fitted using Langmuir isotherm, and forms a monolayer. A kinetic investigation revealed that the adsorption of BrO 3 − 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 BrO 3 − . Residual dissolved ozone reacted with AC, reducing its capacity to absorb BrO 3 − . Proper dosing and staging of the ozonation processes can balance the ozone treatment efficiency, BrO 3 − formation, and the subsequent removal of BrO 3 − .
Adsorption characteristics of trace levels of bromate in drinking water by modified bamboo-based activated carbons
Chen, Ho-Wen (author) / Chuang, Yen Hsun / Hsu, Cheng-Feng / Huang, Winn-Jung
2017
Article (Journal)
English
Recht , Zeitschrift , USA , Datenverarbeitung
| Taylor & Francis Verlag | 2017
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| Online Contents | 1995
Threshold levels for bromate formation in drinking water
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