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首页> 外文期刊>Journal of Environmental Science and Health >Adsorption characteristics of trace levels of bromate in drinking water by modified bamboo-based activated carbons
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Adsorption characteristics of trace levels of bromate in drinking water by modified bamboo-based activated carbons

机译：改性竹基活性炭对饮用水中微量溴酸盐的吸附特性

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摘要

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-.
机译：进行这项研究是为了研究溴酸盐（BrO3-）在被氮气和水蒸气活化的竹炭上的吸附动力学和等温线。将竹基活性炭（AC）浸入酸中，并在高锰酸钾和硫酸的混合物中进行氧化。氧化处理大大改善了AC的物理化学性质，包括纯度，孔结构和表面性质，从而大大增强了BrO3-的吸附能力。具有许多氧化基团和高中孔体积的AC表现出特别有利的BrO3-吸附趋势。使用Langmuir等温线最适合吸附BrO3-，并形成单层。动力学研究表明，AC对BrO3-的吸附涉及化学吸附，并且受颗粒内扩散控制。评估了天然有机物（NOM）对AC的竞争作用，发现它会降低碳吸附BrO3-的能力。残留的溶解臭氧与AC反应，降低了其吸收BrO3-的能力。臭氧化过程的适当剂量和分级可以平衡臭氧处理效率，BrO3的形成和随后的BrO3-的去除。

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