Abstract

Polycyclic aromatic hydrocarbons are nonpolar organic compounds that are made of two or more benzene rings. The most dangerous and the indicator of this group is benzo[a]pyrene consisted of five interlinked benzene rings the carcinogenic effect of which is confirmed by the World Health Organization. In this study, benzo[a]pyrene (BaP) decomposition with UV/ZnO process and treatment condition optimization is studied by design of experiments. The effects of initial concentration of BaP, radiation time, nanoparticle dose and pH were investigated. Thirty one samples were determined using a central composite design. The concentrations of BaP were measured by a high-performance liquid chromatography equipped with an 18 cm column. Data analysis were performed using the Design Expert software. In this study, the effects of BaP concentration, pH, contact time and ZnO concentration were studied. Optimum removal condition was obtained as 76% under 3.5 mg/L BaP, 1.5 g/L nanoparticles, pH equal to 4 and radiation time of 45 min. According to the obtained results UV/ZnO process is an effective procedure for the removal of BaPe from the aquatic solutions and this cleansing process can be done on a larger scale by optimizing the effective operational factors.

摘要

多环芳烃是由两个或多个苯环组成的非极性有机化合物。该组中最危险的指标是苯并[a]芘，由五个相互连接的苯环组成，其致癌作用已被世界卫生组织证实。本研究通过实验设计研究了紫外/氧化锌工艺中苯并[a]芘（BaP）的分解和处理条件的优化。研究了 BaP 初始浓度、辐射时间、纳米粒子剂量和 pH 值的影响。使用中心复合设计确定了 31 个样本。通过配备 18 cm 柱的高效液相色谱法测量 BaP 的浓度。使用Design Expert软件进行数据分析。在本研究中，BaP 浓度、pH、研究了接触时间和氧化锌浓度。在 3.5 mg/L BaP、1.5 g/L 纳米颗粒、pH 等于 4 和 45 分钟的辐射时间下，最佳去除条件为 76%。根据所获得的结果，UV/ZnO 工艺是从水溶液中去除 BaPe 的有效程序，并且可以通过优化有效操作因素来更大规模地进行这种清洁工艺。