Effect of calcium ion on the adsorption of dissolved humic acid onto TiO2 particles in water
In order to clarify the role of HA (humic acid)-TiO2 adsorption in the photocatalytic process, a series of experiments were performed to investigate the adsorption mechanisms in the absence or presence of calcium according to the intermolecular interaction force theory. Based on the experimental results, the models of adsorption mechanism were designed, which were useful in explaining the phenomena that happened during adsorption processes. The adsorption of humic acid onto the TiO2 particles was desperately pH-dependent; however, calcium could increase the amount of adsorption, which was mainly attributed to the calcium ion bridging. The effects of calcium concentration and TiO2 dosage on the adsorption process are also discussed.
作 者： Sun Yanping Fan Caimei 作者单位： Department of Chemical Engineering, College of Chemical Engineering and Technology,Taiyuan University of Technology, 刊 名： 自然科学进展(英文版) SCI 英文刊名： PROGRESS IN NATURAL SCIENCE 年，卷(期)： 2001 11(10) 分类号： O6 关键词：