Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran.
Department of Environmental Sciences & Engineering, Faculty of Agriculture & Natural Resources, Ardakan University, P.O.Box 184, Ardakan, Iran; Medicinal and Industrial Plants Research Institute, Ardakan University, Ardakan, Iran.
J Environ Manage. 2020 Jul 15;266:110616. doi: 10.1016/j.jenvman.2020.110616. Epub 2020 Apr 22.
Furfural is a toxic compound that can cause many problems for human health and the environment. In this study, we addressed the degradation of furfural in aqueous solution using the activated persulfate (SPS) and peroxymonosulfate (PMS) through the ultrasonic (US) wave. Besides, the effect of various parameters (pH, oxidizing dose, initial furfural concentration, US frequency, Inorganic anions concentration, and scavenger) on SPS + US (SPS/US) and PMS + US (PMS/US) processes were examined. The results showed, in order to furfural removal, the US had excellent efficiency in activating SPS and PMS, as in SPS/US and PMS/US processes, 95.3% and 58.4% of furfural (at 25 mg/L concentration) was decomposed in 90 min, respectively. The furfural degradation rate increased with increasing oxidizing dose and US frequency in both SPS/US and PMS/US processes. Considering the synergistic effect, the best removal rate has occurred in the SPS/US process. In the SPS/US and PMS/US processes, furfural removal increased at natural pH (pH 7), and the presence of inorganic anions such as NO and Cl had negative effects on furfural removal efficiency. Also CO and HCO acted as a radical scavenger in the SPS/US process but these anions in the PMS/US process produced more SO radicals, and subsequently, they increased the furfural degradation rate. The results also showed that the predominant radical in the oxidation reactions is the sulfate radical. This study showed that the SPS/US and PMS/US processes are promising methods for degrading organic pollutants in the environment.
糠醛是一种有毒化合物，会对人类健康和环境造成许多问题。在这项研究中，我们通过超声波（US）波使用活化过硫酸盐（SPS）和过一硫酸盐（PMS）来降解水溶液中的糠醛。此外，还考察了各种参数（pH 值、氧化剂量、初始糠醛浓度、US 频率、无机阴离子浓度和清除剂）对 SPS+US（SPS/US）和 PMS+US（PMS/US）过程的影响。结果表明，为了去除糠醛，US 对 SPS 和 PMS 的活化具有优异的效率，在 SPS/US 和 PMS/US 过程中，分别在 90 分钟内分解了 95.3%和 58.4%的糠醛（浓度为 25mg/L）。糠醛降解速率随着 SPS/US 和 PMS/US 过程中氧化剂量和 US 频率的增加而增加。考虑到协同效应，SPS/US 过程中出现了最佳的去除率。在 SPS/US 和 PMS/US 过程中，糠醛去除率在自然 pH 值（pH7）下增加，而 NO 和 Cl 等无机阴离子的存在对糠醛去除效率有负面影响。此外，CO 和 HCO 在 SPS/US 过程中充当自由基清除剂，但这些阴离子在 PMS/US 过程中产生更多的 SO 自由基，从而提高了糠醛的降解速率。结果还表明，氧化反应中的主要自由基是硫酸根自由基。本研究表明，SPS/US 和 PMS/US 工艺是降解环境中有机污染物的有前途的方法。
