Oxidative removal of brilliant green by UV/S2O82-, UV/HSO5- and UV/H2O2 processes in aqueous media: A comparative study

被引：190

作者：

Rehman, Faiza ^{[1
,2
,3
]}

Sayed, Murtaza ^{[2
]}

Khan, Javed Ali ^{[1
,2
]}

Shah, Noor S. ^{[1
,2
,4
]}

Khan, Hasan M. ^{[2
]}

Dionysiou, Dionysios D. ^{[1
,5
]}

机构：

[1] Univ Cincinnati, Dept Chem & Environm Engn, Environm Engn & Sci Program, Engn Res Ctr 705, Cincinnati, OH 45221 USA

[2] Univ Peshawar, Natl Ctr Excellence Phys Chem, Radiat & Environm Chem Lab, Peshawar 25120, Pakistan

[3] Univ Poonch Rawalakot, Dept Chem, Azad, Jammu & Kashmir, Pakistan

[4] COMSATS Univ Islamabad, Dept Environm Sci, Vehari Campus, Islamabad 61100, Pakistan

[5] Univ Cyprus, Nireas Int Water Res Ctr, POB 20537, CY-1678 Nicosia, Cyprus

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2018年 / 357卷

关键词：

Advanced oxidation processes (AOPs); Brilliant green; Degradation pathways; Dyes; Second order rate constant; Water treatment; CYANOBACTERIAL TOXIN CYLINDROSPERMOPSIN; UV-254 NM ACTIVATION; HYDROXYL RADICALS; RATE CONSTANTS; PHOTOCATALYTIC DEGRADATION; PHOTOCHEMICAL DEGRADATION; MECHANISTIC APPROACH; TOXICITY ASSESSMENT; CHEMICAL OXIDATION; HEATED PERSULFATE;

D O I：

10.1016/j.jhazmat.2018.06.012

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The removal of brilliant green (BG), a toxic organic and cationic dye, has been examined by UV/S2O82- (PS), UV/HSO5- (PMS) and UV/H2O2 processes. BG showed insignificant direct photolysis at 254 nm (i.e., 8.6% after 30 min). However, enhanced BG degradation was observed in UV/PS, UV/PMS and UV/H2O2 systems as revealed from 63.1, 47.0 and 34.8% BG degradation, respectively, at 30 min of reaction time, using 0.05 mM BG and 1.0 mM oxidant initial concentration: The bimolecular rate constants of center dot OH and SO4 center dot(-) with BG were determined to be 2.35 x 10(9) and 2.21 x 10(9) M-1 s(-1), respectively. Electrical energy per order (EE/O) values for UV/PS, UV/PMS and UV/H2O2 processes were calculated to be 5.4, 6.8, and 7.8 KWh/m(3)/order, respectively. The addition of humic acid (HA) and inorganic anions inhibited the degradation of BG by UV/PS in the order of NO2- > HA > HCO3- > Cl- > NO3- approximate to SO42-. The results of frontier electron densities (FEDs) showed that C-atom holding the three rings (C7), and C-atoms at para positions to N-alkyl groups of the two rings (C4 and C14) are the predominant sites for radical addition. Furthermore, nine degradation products (DPs) of BG were detected experimentally using LC/MS/MS.

引用

页码：506 / 514

页数：9

共 44 条

[1] Photocatalytic degradation and mineralization mechanism and toxicity assessment of antivirus drug acyclovir: Experimental and theoretical studies [J].