摘要
用HNO3,HCl,NaOH及NH3分别对颗粒活性炭进行表面改性,通过静态吸附试验研究水中BrO-3在颗粒活性炭上的吸附特性,考察了活性炭孔径分布及官能团变化对BrO-3吸附的影响,测定了活性炭的吸附动力学曲线和吸附等温线.结果表明:BrO-3在活性炭上的吸附符合伪二级速率方程及内颗粒扩散模型,吸附中存在孔扩散过程,且孔扩散为活性炭吸附的主要速率控制步骤.活性炭的中孔体积是其吸附能力的主要控制因素,同时活性炭表面较高的碱性官能团和零电荷点法(pHpzc)有利于BrO-3的去除.
Granular activated carbon was modified with HNO3, HCl, NaOH and NH3, respectively. Bromate （BROW-） ion removal from drinking water by granular activated carbon （GAC） was evaluated in bath mode. The characteristics of granular activated carbon, such as the particle size, the pore size distribution and the changing of functional group, to influence the adsorption of BrO3- was studied by performing the adsorption kinetic and adsorption isotherm tests. The results show that the pseudo- second-order and intraparticle diffusion models are applicable to describe adsorption of BROW-on GAC. The process of inner diffusion exists, and it is the key factor to.control the adsorption rate on GAC. The adsorption capacity of GAC is independent of GAC＇s particle size. However, the initial adsorption rate decreases as the increasing of particle size. Surface area of GAC is not the main factor for controlling adsorption capacity of GAC. Activated carbons with high pHpzc values and many basic groups are conducive to the adsorption of BROW-on GAC.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第5期95-100,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
"十二五"国家科技重大水专项资助项目(2011ZX07410-001)
苏州市科技计划资助项目(SS201130)
关键词
活性炭
溴酸盐
吸附动力学
吸附等温线
饮用水
activated carbon
bromate
adsorption kinetic
adsorption isotherm
drinking water
