眾多增塑劑中以鄰苯二甲酸酯類化合物（Phthalate acid esters，PAEs）為最大宗，鄰苯二甲酸二異丁酯（diisobutyl phthalate，DIBP）為常用增塑劑之一。根據研究發現鄰苯二甲酸酯類化合物為疑似環境荷爾蒙，而影響到人類的身體健康。
本實驗以氧化鐵覆膜石英砂（Iron-oxide coated sand）結合使用過氧化氫，可產生氫氧自由基的弁遄A以去除溶液中之DIBP。結果顯示接近中性pH值時，鐵氧化物從砂表面溶解的催化反應影響下，使氧化鐵覆膜石英砂具有催化分解過氧化氫的能力。在背景實驗部分發現當過氧化氫單獨純在時，並無氧化DIBP能力。然而，值得注目的是DIBP會吸附於氧化鐵覆膜石英砂。在異相溶液混合攪拌時，DIBP有吸附於氧化鐵覆膜石英砂表面的現象產生。不同pH值條件下，H2O2＝25mg/L時，反應中之DIBP以吸附作用為主。另外觀察到異相溶液在高pH值及高濃度過氧化氫之情況下，吸附作用能力較低。 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.
