UV强化草酸络合Fe~(2+)活化过硫酸盐氧化苯胺研究
Enhanced degradation of aniline by PS oxidation in the presence of UV and ferrous oxalate
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文摘
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采用UV强化草酸络合Fe~(2+)活化过硫酸钠(PS)氧化降解苯胺,研究了UV光照促进苯胺降解的作用机制,考察了pH、草酸浓度和UV光照强度对PS活化及苯胺降解的影响.结果表明,引入UV光照后,草酸络合Fe~(2+)活化PS体系中的PS活化率和苯胺降解率分别提高了68%和41%.在该过程中,UV可通过光解或光电离水分子产生·OH、促进发生光化学Fenton反应、直接活化PS等作用机制降解苯胺,但通过光化学反应促进Fe~(2+)循环转化是提高PS持续活化效果和苯胺去除的首要作用机制;中碱性及强酸性环境因不利于Fe(C_2O_4)_3~(3-)形成,会对PS活化过程产生抑制,但当初始pH为7和9时,由于PS活化分解促进反应体系pH下降,PS活化及苯胺降解均取得较好效果;草酸浓度的增加有利于 PS活化,但当草酸浓度高于2.5 mmol·L~(-1)时,会对SO·-4产生强烈竞争,导致苯胺降解率出现下降;增加UV光照强度能显著促进PS活化和苯胺氧化去除,当UV光照强度达到117μW·cm~(-2)时,反应150 min后,PS的分解率和苯胺的去除率均可达到100%. |
其他语种文摘
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Enhanced oxidative degradation of aniline by sodium persulfate(PS)in the presence of ferrous oxalate and UV irradiation was studied.The mechanisms of aniline degradation induced by UV irradiation and the effects of pH,oxalic acid concentration,UV irradiation intensity on PS activation and aniline degradation were investigated.The obtained results indicated that the efficiency of PS activation and aniline degradation increased by 68% and 41%,respectively,when UV irradiation was introduced.The enhancement of aniline degradation in the presence of UV irradiation was probably attributed to a variety of mechanisms,such as photochemical homolysis or ionization of H_2O into·OH,photo-induced Fenton reaction and direct activation of PS,but the transformation of Fe~(3+)to Fe~(2+)which accelerated the PS activation was the dominant mechanism.In addition,it was found that the neutral,alkaline and extremely acidic conditions retarded the formation of Fe(C_2O_4)_3~(3-),which might result in the low efficiency of PS activation.However,the efficiency of PS activation and aniline degradation at initial pH of 7 and 9 were considerable due to the pH decrease during the reaction.The increase of oxalic acid concentration promoted the PS activation,but when the concentration was higher than 2.5 mmol·L~(-1),the strong competition of sulfate radicals due to the excessive oxalic acid reduced the aniline degradation efficiency.The efficiency of PS activation and aniline removal was improved significantly with the increase of UV irradiation intensity,and both of them achieved almost 100% in 150 min when the UV irradiation intensity was 117μW·cm~(-2). |
来源
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环境科学学报
,2018,38(7):2659-2666 【核心库】
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DOI
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10.13671/j.hjkxxb.2018.0107
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关键词
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紫外光
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草酸
;
络合亚铁
;
过硫酸盐
;
氧化
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地址
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1.
环境保护部华南环境科学研究所, 广州, 510655
2.
广东省水与大气污染防治重点实验室, 广东省水与大气污染防治重点实验室, 广州, 510655
3.
中国科学院广州地球化学研究所, 广州, 510640
4.
华南师范大学环境研究院, 广州, 510006
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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0253-2468 |
学科
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行业污染、废物处理与综合利用 |
基金
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广东省自然科学基金
;
中央级公益性科研院所基本科研业务专项基金
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文献收藏号
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CSCD:6278557
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参考文献 共
28
共2页
|
1.
Balmer M E. Atrazine degradation in irradiated iron oxalate systems: Effects of pH and oxalate.
Environmental Science & Technology,1999,33(14):2418-2424
|
被引
32
次
|
|
|
|
2.
Crimi M L. Experimental evaluation of catalyzed hydrogen peroxide and sodium persulfate for destruction of BTEX contaminants.
Soil and Sediment Contamination: An International Journal,2007,16(1):29-45
|
被引
19
次
|
|
|
|
3.
Cui H. Degradation of ethylbenzene in aqueous solution by sodium percarbonate activated with EDDS-Fe (III) complex.
Chemical Engineering Journal,2017,309:80-88
|
被引
8
次
|
|
|
|
4.
Devi P. In-situ chemical oxidation: Principle and applications of peroxide and persulfate treatments in wastewater systems.
Science of the Total Environment,2016,571:643-657
|
被引
32
次
|
|
|
|
5.
Dong H. Accelerated degradation of iopamidol in iron activated persulfate systems: Roles of complexing agents.
Chemical Engineering Journal,2017,316:288-295
|
被引
2
次
|
|
|
|
6.
Fordham J W L. The persulfate-iron(II) initiator system for free radical polymerizations.
Journal of the American Chemical Society,1951,73(10):4855-4859
|
被引
6
次
|
|
|
|
7.
Furman O S. Mechanism of base activation of persulfate.
Environmental Science & Technology,2010,44(16):6423-6428
|
被引
120
次
|
|
|
|
8.
Han D. New insights into the role of organic chelating agents in Fe (II ) activated persulfate processes.
Chemical Engineering Journal,2015,269(Supplement C):425-433
|
被引
9
次
|
|
|
|
9.
Huang K C. Kinetics of heat-assisted persulfate oxidation of methyl tert-butyl ether (MTBE).
Chemosphere,2002,49(4):413-420
|
被引
76
次
|
|
|
|
10.
Imoberdorf G. Kinetic study and modeling of the vacuum-UV photoinduced degradation of 2,4-D.
Chemical Engineering Journal,2012,187:114-122
|
被引
12
次
|
|
|
|
11.
Jiang X X. Degradation of bisphenol A in aqueous solution by persulfate activated with ferrous ion.
Environmental Science and Pollution Research,2013,20(7):4947-4953
|
被引
10
次
|
|
|
|
12.
Khan J A. Kinetic and mechanism investigation on the photochemical degradation of atrazine with activated H_2 O_2,S2 O_8~(2-) and HSO_5.
Chemical Engineering Journal,2014,252:393-403
|
被引
20
次
|
|
|
|
13.
Killian P F. Iron (II ) activated persulfate oxidation of MGP contaminated Soil.
Soil and Sediment Contamination: An International Journal,2007,16(6):523-537
|
被引
14
次
|
|
|
|
14.
Kolthoff I M. The chemistry of persulfate. I. the kinetics and mechanism of the decomposition of the persulfate ion in aqueous medium1.
Journal of the American Chemical Society,1951,73(7):3055-3059
|
被引
48
次
|
|
|
|
15.
Kusic H. Modeling of iron activated persulfate oxidation treating reactive azo dye in water matrix.
Chemical Engineering Journal,2011,172(1):109-121
|
被引
16
次
|
|
|
|
16.
Liang C. Persulfate oxidation for in situ remediation of TCE. II. Activated by chelated ferrous ion.
Chemosphere,2004,55(9):1225-1233
|
被引
43
次
|
|
|
|
17.
Liang C J. Persulfate oxidation for in situ remediation of TCE. I. Activated by ferrous ion with and without a persulfate-thiosulfate redox couple.
Chemosphere,2004,55(9):1213-1223
|
被引
58
次
|
|
|
|
18.
Liang C J. A rapid spectrophotometric determination of persulfate anion in ISCO.
Chemosphere,2008,73(9):1540-1543
|
被引
50
次
|
|
|
|
19.
Lin C C. Degradation of ciprofloxacin by UV/S_2 O_8~(2-) process in a large photoreactor.
Journal of Photochemistry and Photobiology A: Chemistry,2014,285(0):1-6
|
被引
6
次
|
|
|
|
20.
Medina R. Remediation of a soil chronically contaminated with hydrocarbons through persulfate oxidation and bioremediation.
Science of the Total Environment,2018,618:518-530
|
被引
12
次
|
|
|
|
|