Iron oxide-coated quartz sand for treating aqueous diisobutyl phthalate in the presence of hydrogen peroxide

• Main Authors: Shin-yi Tu, 杜欣怡
• Other Authors: Chih-Hsiang Liao
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/10377143893838625440

碩士 === 嘉南藥理科技大學 === 環境工程與科學系碩士班 === 94 === Phthalate acid esters (PAEs) represent the most amount of plasticizers. Of the PAEs, Diisobutyl phthalate (DIBP) is frequently used as one of plasticizers. According to the literature, PAEs are suspected as environmental endocrine disrupter (EED), posing a threat to the human health. In this study, iron-oxide coated sand combined with the use of hydrogen peroxide, which may lead to the formation of hydroxyl radicals, was used to remove DIBP from the solution. The result shows that the iron-oxide coated sand can catalyze decomposition of hydrogen peroxide under a neutral pH condition, where iron oxide tends to dissolve from the sand surface to catalyze the reaction of interest. Based on the control experiments, hydrogen peroxide alone can not oxidize DIBP. However, DIBP will be adsorbed onto the iron-oxide pellets significantly. Note that the mixing power in the heterogeneous solution may result in the desorption of DIBP from the surface of iron pellets. Given the H2O2 concentration of 25 mg/L as well as under various pH conditions, the adsorption of DIBP dominates its oxidation reaction. In addition, it was observed that the higher the pH or the hydrogen peroxide concentration, the lower the adsorption of DIBP in the heterogeneous solution.