Degradation of ethyl paraben in aqueous medium using advanced oxidation processes: Efficiency evaluation of UV-C supported oxidants. (10th April 2018)

• Record Type: Journal Article
• Authors: Dhaka, Sarita; Kumar, Rahul; Lee, Sang-hun; Kurade, Mayur B.; Jeon, Byong-Hun
• Is Part Of: Journal of cleaner production. Volume 180(2018)
• Page Start: 505
• Page End: 513
• Publication Date: 2018-04-10
• Subjects: Ethyl paraben (EP) -- Ultraviolet (UV) -- Oxidants -- Advanced oxidation processes (AOPs) -- Degradation; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2018.01.197
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: UV-C-mediated advanced oxidation processes (AOPs) for the enhanced degradation of ethyl paraben (EP) in the presence of oxidants such as persulfate (PS), hydrogen peroxide (H2 O2 ) and peroxymonosulfate (PMS) were systematically investigated. The AOP treatments showed 98.1%, 97.0% and 81.3% degradation of EP with rates of 0.0373, 0.0339, and 0.0202 min −1 within 90 min for UV/PS, UV/H2 O2 and UV/PMS, respectively. Degradation rates of EP increased with higher initial dosages of oxidant(s), while the opposite trend was observed in the case of increasing initial EP concentration. Maximum EP removal was achieved at pH 6.5 for UV/PS and UV/PMS and at pH 3 for UV/H2 O2 . Humic acid significantly retarded the degradation of EP. Chloride (Cl − ) and carbonate (CO3 2− ) suppressed reaction rates using UV/PS and UV/H2 O2 systems, whereas they elevated the degradation rates with UV/PMS treatment. Degradation of EP in each of the UV-C based AOPs followed pseudo-first-order kinetics. The use of ethanol and t-butyl alcohol as scavengers revealed that HO and radicals were the major reactive radicals in UV/H2 O2, UV/PS, and UV/PMS treatments. The efficiency (according to electrical energy per order and total cost per cubic meter) of the systems followed the order UV/PS > UV/H2 O2 > UV/PMS. Thus, UV/PS process was more efficient and economical for EP degradation than the other processes examined in this study. Graphical abstract: Image 1 Highlights: Aqueous phase ethyl paraben (EP) degradation using UV-C based AOPs was investigated. EP degradation was pH dependent and followed pseudo-first-order kinetics. Anions (Cl −, CO 3 2 − ) suppressed EP degradation in UV/PS and UV/H2 O2 systems. HO and radicals were predominant in UV/H2 O2 and UV/PS/PMS processes Efficiency of the processes followed the order: UV/PS > UV/H2 O2 >UV/PMS.