期刊
JOURNAL OF WATER PROCESS ENGINEERING
卷 32, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jwpe.2019.100983
关键词
Sulfite; TiO2; Oxidation/reduction processes; Degradation; Energy consumption; Kinetic
资金
- Alborz University of Medical Sciences, Karaj, Iran [IR.ABZUMS.REC.1397.155]
- Alborz University of Medical Sciences
This study relies on the UV irradiation of sulfite and TiO2, i.e. UV/sulfite/TiO2 (UST), as a novel method of Advanced Oxidation/Reduction Processes (AORPs) to generate both oxidative and reductive agents, simultaneously for degradation and mineralization of polychlorinated biphenyls (PCBs).The degradation performances of PCBs by UV alone, UV/sulfite (US) and UV/ TiO2 (UT) were estimated 60%, 81.8% and 92%, respectively under selected conditions (PCB concentration,12 mg L-1; pH, 7; ratio of sulfite/TiO2, 1:1; reaction time, 60 min).The 98.5% degradation of PCBs was obtained when both oxidative and reductive agents (UST) were applied simultaneously. Also, as the kinetic information, value of r(obs) for UST was 27.33, 16.4, 9.84, 8.2, 2.23 and 1.44 times than that of the sulfite, TiO2, TiO2-sulfite, UV alone, US and UT, respectively. Also, values of energy consumption for UV alone, US, UT and UST were calculated 426, 115.13, 74.4 and 51.95 kW h m(-3), respectively. The maximum mineralization percentage for UST was obtained 70.92% under selected conditions. The results indicated addition of nitrate and t-But (which are strong scavengers of (e(aq)- and SO3 center dot-) and (O-2(center dot)- and (OH)-O-center dot radicals, respectively) simultaneously, significantly was diminished the degradation performance from 98.5% (in the absence of scavengers) to 70% (in the presence of nitrate and t-But together); it clearly proved reductive (SO3 center dot-and e(aq)- radicals) and oxidative ((OH)-O-center dot and O-2(center dot)- radicals) agents plays a noticeable role in the PCB degradation.
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