Efficient degradation of Rhodamine B in water by CoFe2O4/H2O2 and CoFe2O4/PMS systems: A comparative study

被引:76
作者
Liu, Dongdong [1 ,2 ]
Chen, Dengqian [2 ]
Hao, Zhengkai [2 ]
Tang, Yibo [2 ]
Jiang, Lipeng [2 ]
Li, Tianqi [2 ]
Tian, Bing [2 ]
Yan, Cuiping [2 ]
Luo, Yuan [2 ]
Jia, Boyin [3 ]
机构
[1] Jilin Agr Univ, Key Lab Straw Biol & Utilizat, Minist Educ, Changchun 130118, Peoples R China
[2] Jilin Agr Univ, Coll Engn & Technol, Changchun 130118, Peoples R China
[3] Jilin Agr Univ, Coll Anim Med, Changchun 130118, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Cobalt ferrite; H2O2/PMS-based AOPs; Catalytic mechanism; Degradation pathway; Actual applicability; FENTON-LIKE REACTION; HETEROGENEOUS CATALYST; ORGANIC CONTAMINANTS; MEDIATED DEGRADATION; PEROXYMONOSULFATE; ACTIVATION; OXIDATION; PERSULFATE; SULFATE; NANOPARTICLES;
D O I
10.1016/j.chemosphere.2022.135935
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this work, a comparative study of efficient degradation of Rhodamine B (RhB) in CoFe2O4/H2O2 and CoFe2O4/PMS systems was performed. Batch experiments indicated that the RhB degradation rate of CoFe2O4/H2O2 system reached 95.5% at 90 min under the condition of 0.5 g L-1 of CoFe2O4 dosage, 10 mM of H2O2 concentration and 3.0 of initial pH. At certain conditions of initial pH = 7.0, 0.3 g L-1 of CoFe2O4 dosage, 7 mM of PMS concentration, CoFe2O4/PMS system could completely degrade RhB within 90 min. EPR and quenching experiments indicated that center dot OH was the main active species of CoFe2O4/H2O2 system, and center dot OH, SO4 center dot(-), center dot O-2(-) and O-1(2) participated in RhB degradation of CoFe2O4/PMS system. The circulate of Co(II)/Co(III) and Fe(II)/Fe(III) on the CoFe2O4 surface promoted the formation of free radical species in the two system. In CoFe2O4/PMS system, the formed center dot O-2(-) and SO5 center dot(-) realized the generation of non-free radical species (O-1(2)). The LC-MS results indicated that N-de-ethylation, chromophore cleavage, opening rings and mineralization were the main steps for the RhB degradation of the two systems. After five cycles of degradation experiment, the CoFe2O4/H2O2 and CoFe2O4/PMS systems still maintained the high degradation rate (85.2% and 92.4%) and low mass loss (2.7% and 3.09%). In addition, CoFe2O4/PMS system had better potential value for the actual water and multi-pollutant degradation than CoFe2O4/H2O2 system. Finally, the toxicity analysis and cost assessment of the two oxidation systems were preliminarily evaluated.
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页数:14
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