Al Hakim Suha, Baalbaki Abbas, Tantawi Omar, Ghauch Antoine
American University of Beirut, Faculty of Arts and Sciences, Department of Chemistry P.O. Box 11-0236 Riad El Solh 1107-2020 Beirut Lebanon
RSC Adv. 2019 Oct 18;9(57):33472-33485. doi: 10.1039/c9ra05362j. eCollection 2019 Oct 15.
Degradation of PPCPs by AOPs has gained major interest in the past decade. In this work, theophylline (TP) oxidation was studied in thermally (TAP) and chemically (CAP) activated persulfate systems, separately and in combination (TCAP). For [TP] = 10 mg L, (i) TAP resulted in 60% TP degradation at [PS] = 5 mM and = 60 °C after 60 min of reaction and (ii) CAP showed slight degradation at room temperature; however, (iii) TCAP resulted in complete TP degradation for [PS] = [Fe] = 2 mM at = 60 °C following a pseudo-first order reaction rate with calculated = 5.6 (±0.4) × 10 min. In the TCAP system, the [PS] : [Fe] ratio of 1 : 1 presented the best results. A positive correlation was obtained between the TP degradation rate and increasing temperature and [PS], and a negative correlation was obtained with increasing pH. Both chloride and humic acid inhibited the degradation process, while nitrates enhanced it. TP dissolved in spring, sea and waste water simulating real effluents showed lower degradation rates than in DI water. Waste water caused the highest inhibition ( = 2.6 (±0.6) × 10 min). Finally, the TCAP system was tested on a real factory effluent highly charged with TP, [TP] = 160 mg L, with successful degradation under the conditions of 60 °C and [PS] = [Fe] = 50 mM.
在过去十年中，高级氧化工艺（AOPs）对持久性有机污染物（PPCPs）的降解引起了人们的极大兴趣。在这项工作中，分别对热活化过硫酸盐（TAP）体系和化学活化过硫酸盐（CAP）体系以及二者联用（TCAP）体系中茶碱（TP）的氧化进行了研究。对于[TP]=10mg/L，（i）在反应60分钟后，当[PS]=5mM且温度=60℃时，TAP体系使TP降解了60%；（ii）CAP体系在室温下显示出轻微降解；然而，（iii）在60℃下，对于[PS]=[Fe]=2mM的TCAP体系，TP按照假一级反应速率完全降解，计算得到的速率常数=5.6（±0.4）×10⁻³min⁻¹。在TCAP体系中，[PS]∶[Fe]比例为1∶1时效果最佳。TP降解速率与温度升高和[PS]增加呈正相关，与pH升高呈负相关。氯化物和腐殖酸均抑制降解过程，而硝酸盐则促进降解。溶解在模拟实际废水的泉水、海水和废水中的TP的降解速率低于去离子水中的降解速率。废水造成的抑制作用最强（=2.6（±0.6）×10⁻³min⁻¹）。最后，在含有高浓度TP（[TP]=160mg/L）的实际工厂废水中对TCAP体系进行了测试，在60℃和[PS]=[Fe]=50mM的条件下成功实现了降解。
