Removal of bromate ion using powdered activated carbon.
Removal of bromate ion using powdered activated carbon.
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DOI：
10.1016/s1001-0742(09)60330-2
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发表时间：
2010-12
影响因子：
6.9
通讯作者：
Lian Wang;Jie Zhang;Jingze Liu;Hong He;Min Yang;Jianwei Yu;Zichuan Ma;F. Jiang
中科院分区：
文献类型：
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作者：
Lian Wang;Jie Zhang;Jingze Liu;Hong He;Min Yang;Jianwei Yu;Zichuan Ma;F. Jiang
在不同的操作条件下，以水浴模式评价了粉末活性炭（PACS）去除饮用水中溴酸根离子（BrO 3 −）的效果。选择木质炭、水果炭、煤基炭以及这3种炭在氮气气氛下热还原的6种PAC，考察其对BrO 3 −的去除能力。煤基炭具有最高的zeta电位值和丰富的介孔，具有高且优异的BrO 3 −吸附效率。在100 μg/L的溴酸盐溶液中，每克煤基炭在5小时内去除BrO 3 −的含量为0.45 mg。PAC的表面特性和溴化物的生成表明，物理和化学性质的PAC同时影响吸附还原过程。在酸性条件下，PAC具有高zeta值和足够的碱性基团，并显示中性或正电荷，促进BrO 3 −在碳表面的吸附-还原。有趣的是，在N2气氛中热还原的PAC优化了它们的性能，例如增加了它们的zeta值并降低了氧含量，这加速了BrO 3 −的去除速率。水果基碳的最大吸附容量是所有测试的碳中最高的（99.6 mg/g），可能是由于其最大的孔体积。在N2气氛下热再生可以完全恢复活性炭的吸附能力。使用伪二级和粒子内扩散模型分析了从碳获得的动力学数据，结果表明粒子内扩散是描述BrO 3 −在PAC上吸附的更适用模型。
Bromate ion (BrO3−) removal from drinking water by powdered activated carbons (PACS) in bath mode was evaluated under various operational conditions. Six kinds of PACs, including wood-based carbon, fruit-based carbon, coal-based carbon, and these three carbons thermally deoxidized in a nitrogen atmosphere, were selected to investigate their capacity on BrO3−removal. With the highest zeta potential value and being richly mesoporous, coal-based carbon had a high and an excellent BrO3−adsorption efficiency. The removal content of BrO3−by per gram of coal-based carbon was 0.45 mg within 5 hr in 100 μg/L bromate solution. The surface characteristics of PACs and bromide formation revealed that both physical and chemical PACs properties simultaneously affected the adsorption-reduction process. Under acidic conditions, PACSpossessed high zeta value and adequate basic groups and exhibited neutral or positive charges, promoting BrO3−adsorption-reduction on the carbon surface. Interestingly, the PACSthermally deoxidized in N2atmosphere optimized their properties, e.g. increasing their zeta values and decreasing the oxygen content which accelerated the BrO3−removal rate. The maximum adsorption capacity of fruit-based carbon was the highest among all tested carbons (99.6 mg/g), possibly due to its highest pore volume. Remarkably, the thermal regeneration of PACs in N2atmosphere could completely recover the adsorption capacity of PACs. The kinetic data obtained from carbons was analyzed using pseudo second-order and intraparticle diffusion models, with results showing that the intraparticle diffusion was the more applicable model to describe adsorption of BrO3−onto PACs.