Environmental Engineering and Science Program, Department of Chemical and Environmental Engineering, University of Cincinnati, 705 Engineering Research Center, Cincinnati, OH, 45221-0012, United States; Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan; Department of Chemistry, The University of Poonch Rawalakot, Azad Jammu & Kashmir, Pakistan.
Radiation and Environmental Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, 25120, Pakistan.
J Hazard Mater. 2018 Sep 5;357:506-514. doi: 10.1016/j.jhazmat.2018.06.012. Epub 2018 Jun 6.
The removal of brilliant green (BG), a toxic organic and cationic dye, has been examined by UV/SO (PS), UV/HSO (PMS) and UV/HO processes. BG showed insignificant direct photolysis at 254 nm (i.e., 8.6% after 30 min). However, enhanced BG degradation was observed in UV/PS, UV/PMS and UV/HO systems as revealed from 63.1, 47.0 and 34.8% BG degradation, respectively, at 30 min of reaction time, using 0.05 mM BG and 1.0 mM oxidant initial concentration. The bimolecular rate constants of OH and SO with BG were determined to be 2.35 × 10 and 2.21 × 10 M s, respectively. Electrical energy per order (EE/O) values for UV/PS, UV/PMS and UV/HO processes were calculated to be 5.4, 6.8, and 7.8 KWh/m/order, respectively. The addition of humic acid (HA) and inorganic anions inhibited the degradation of BG by UV/PS in the order of NO > HA > HCO > Cl > NO ≈ SO. The results of frontier electron densities (FEDs) showed that C-atom holding the three rings (C7), and C-atoms at para positions to N-alkyl groups of the two rings (C4 and C14) are the predominant sites for radical addition. Furthermore, nine degradation products (DPs) of BG were detected experimentally using LC/MS/MS.
采用 UV/SO（PS）、UV/HSO（PMS）和 UV/HO 工艺研究了去除亮绿（BG）这种有毒有机阳离子染料的效果。在 254nm 下，BG 的直接光解可忽略不计（即 30min 后为 8.6%）。然而，在 UV/PS、UV/PMS 和 UV/HO 体系中，BG 的降解得到显著增强，分别在 30min 的反应时间内，BG 降解率达到 63.1%、47.0%和 34.8%，BG 初始浓度为 0.05mM，氧化剂初始浓度为 1.0mM。确定了 OH 和 SO 与 BG 的双分子反应速率常数分别为 2.35×10 和 2.21×10 M s。UV/PS、UV/PMS 和 UV/HO 工艺的电能每阶（EE/O）值分别计算为 5.4、6.8 和 7.8kWh/m/order。腐殖酸（HA）和无机阴离子的添加抑制了 UV/PS 中 BG 的降解，其抑制顺序为 NO>HA>HCO>Cl>NO≈SO。前沿电子密度（FED）的结果表明，三苯环上的 C 原子（C7）和两个苯环上 N-烷基对位的 C 原子（C4 和 C14）是自由基加成的主要位置。此外，利用 LC/MS/MS 实验检测到 BG 的 9 个降解产物（DPs）。
