Islamic Azad University, Bandar Abbas Branch, Hormozgan, Bandar Abbas, Iran.
J Environ Public Health. 2013;2013:815310. doi: 10.1155/2013/815310. Epub 2013 Apr 23.
The main objective of this study was to examine the photocatalytic degradation of phenol from laboratory samples and petrochemical industries wastewater under UV radiation by using nanoparticles of titanium dioxide coated on the inner and outer quartz glass tubes.
The first stage of this study was conducted to stabilize the titanium dioxide nanoparticles in anatase crystal phase, using dip-coating sol-gel method on the inner and outer surfaces of quartz glass tubes. The effect of important parameters including initial phenol concentration, TiO2 catalyst dose, duration of UV radiation, pH of solution, and contact time was investigated.
In the dip-coat lining stage, the produced nanoparticles with anatase crystalline structure have the average particle size of 30 nm and are uniformly distributed over the tube surface. The removal efficiency of phenol was increased with the descending of the solution pH and initial phenol concentration and rising of the contact time.
Results showed that the light easily passes through four layers of coating (about 105 nm). The highest removal efficiency of phenol with photocatalytic UV/TiO2 process was 50% at initial phenol concentration of 30 mg/L, solution pH of 3, and 300 min contact time. The comparison of synthetic solution and petrochemical wastewater showed that at same conditions the phenol removal efficiency was equal.
本研究的主要目的是在 UV 辐射下，通过在石英玻璃管内外表面涂覆纳米二氧化钛，考察纳米二氧化钛对实验室水样和石化工业废水中苯酚的光催化降解作用。
本研究首先采用浸涂溶胶-凝胶法，在石英玻璃管内外表面稳定锐钛矿型二氧化钛纳米粒子。考察了初始苯酚浓度、TiO2 催化剂用量、UV 辐射时间、溶液 pH 值和接触时间等重要参数的影响。
在浸涂涂层阶段，所制备的具有锐钛矿晶型结构的纳米粒子平均粒径为 30nm，且在管表面均匀分布。苯酚的去除效率随溶液 pH 值和初始苯酚浓度的降低以及接触时间的延长而提高。
结果表明，光很容易穿透四层涂层（约 105nm）。在初始苯酚浓度为 30mg/L、溶液 pH 值为 3 和 300min 接触时间的条件下，光催化 UV/TiO2 工艺对苯酚的去除效率最高可达 50%。与合成溶液和石化废水的比较表明，在相同条件下，苯酚的去除效率相等。
