乙二醇或1,2-乙二醇(EG)是环境中的持久性和毒性物质,广泛应用于石油化工,表面活性剂,防冻剂,沥青乳胶漆,化妆品,塑料,和聚酯纤维工业。探索了使用紫外线(UV)活化的过氧化氢(H2O2)和过硫酸盐(PS)或过硫酸盐阴离子(S2O82-)的高级氧化工艺(AOPs)降解EG的方法。获得的结果表明,在24mMEG浓度的最佳操作条件下,UV/PS(85.7±2.5%)与UV/H2O2(40.4±3.2%)相比,EG的降解效率有所提高。5mM的H2O2,5mM的PS,1.02mWcm-2的紫外线通量,pH值为7.0。运营因素的影响,包括初始EG浓度,氧化剂用量,反应时间,以及不同水质参数的影响,在本次调查中也进行了探索。在两种方法中,EG在Milli-Q®水中的降解遵循伪一级反应动力学,对于UV/H2O2和UV/PS,其速率常数约为0.070min-1和0.243min-1,分别,在最佳操作条件。此外,还在最佳实验条件下进行了经济评估,并且观察到处理每m3含EG废水的每订单电能和总运营成本分别约为0.042kWhm-3订单-1和0.221$m-3订单-1,对于UV/PS,略低于UV/H2O2(0.146kWhm-3order-1;0.233$m-3order-1)。基于傅里叶变换红外(FTIR)光谱和气相色谱-质谱(GC-MS)检测的中间副产物,提出了潜在的降解机理。此外,含有EG的实际石化废水也通过UV/PS处理,在5mMPS和1.02mWcm-2的UV通量下,证明了74.7±3.8%的EG和40.7±2.6%的总有机碳去除率。对大肠杆菌的毒性测试(E.大肠杆菌)和Vignaradiata(绿色克)证实了UV/PS处理水的无毒性质。
Ethylene glycol or 1,2-ethanediol (EG) is a persistent and toxic substance in the environment and extensively applied in petrochemical, surfactants, antifreeze, asphalt emulsion paints, cosmetics, plastics, and polyester fiber industries. Degradation of EG by using ultraviolet (UV) activated hydrogen peroxide (H2O2) and persulfate (PS) or persulfate anion (S2O82-) based advanced oxidation processes (AOPs) were explored. The result obtained demonstrate that UV/PS (85.7 ± 2.5%) has exhibited improved degradation efficiency of EG as compared to UV/H2O2 (40.4 ± 3.2%) at optimal operating conditions of 24 mM of EG concentration, 5 mM of H2O2, 5 mM of PS, 1.02 mW cm-2 of UV fluence, and pH of 7.0. Impacts of operating factors, including initial EG concentration, oxidant dosage, reaction duration, and the impact of different water quality parameters, were also explored in this present investigation. The degradation of EG in Milli-Q® water followed pseudo - first order reaction kinetics in both methods having a rate constant of about 0.070 min-1 and 0.243 min-1 for UV/H2O2 and UV/PS, respectively, at optimum operating conditions. Additionally, an economic assessment was also conducted under optimal experimental conditions, and the electrical energy per order and total operational cost for treating per m3 of EG-laden wastewater was observed to be about 0.042 kWh m-3 order-1 and 0.221 $ m-3 order-1, respectively, for UV/PS, which was slightly lower than UV/H2O2 (0.146 kWh m-3 order-1; 0.233 $ m-3 order-1). The potential degradation mechanisms were proposed based on intermediate by-products detected by Fourier transform infrared (FTIR) spectroscopy and gas chromatography-mass spectroscopy (GC-MS). Moreover, real petrochemical effluent containing EG was also treated by UV/PS, demonstrating 74.7 ± 3.8% of EG and 40.7 ± 2.6% of total organic carbon removal at 5 mM of PS and 1.02 mW cm-2 of UV fluence. A toxicity tests on Escherichia coli (E. coli) and Vigna radiata (green gram) confirmed non-toxic nature of UV/PS treated water.