热活化过硫酸钠氧化甲基紫的研究
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摘要
通过热活化过硫酸钠产生强氧化性的自由基,研究其对甲基紫废水的脱色效果,考察了活化温度、初始pH及过硫酸钠的投加量对脱色效果的影响。结果表明:升高温度有利于提高热活化过硫酸钠对甲基紫的脱色率,当温度为60℃时,甲基紫的脱色率达到92.4%;在pH=3~9时,甲基紫脱色率随着pH的升高而减小;增加过硫酸钠的投加量有利于甲基紫的脱色率,当过硫酸钠的浓度达到1 mmol/L时,甲基紫的脱色率显著地增加至95.5%,继续增加过硫酸钠的投加量,甲基紫的脱色率反而下降。自由基淬灭实验表明:热活化过硫酸钠时,在酸性条件下,甲基紫的脱色主要是·SO_4~-的作用,碱性条件下,甲基紫的脱色主要是·OH的作用。
The effects of activation temperature,initial pH and sodium persulfate dosage on the decolorization were studied by using the heat activated sodium persulfate to produce strong oxidizing free radicals. The results showed that the decolorization rate of methyl violet was 92. 4% when the temperature was 60 ℃. The decolorization rate of methyl violet increased with the increase of pH in the range of 3 ~ 9. And the addition of sodium persulfate was beneficial to the decolorization rate of methyl violet. When the concentration of sodium persulfate reached 1 mmol/L,the decolorization rate of methyl violet significantly increased to 95. 5%. However,continually increasing the dosage of sodium persulfate,methyl violet bleaching rate decreased.Free radical scavenging experiments showed that the decolorization of methyl violet was mainly due to the effect of·SO_4~- on the activation of sodium persulfate under acidic conditions. Under alkaline conditions,·OH palyed a key role in the decolorization of methyl violet.
The effects of activation temperature,initial pH and sodium persulfate dosage on the decolorization were studied by using the heat activated sodium persulfate to produce strong oxidizing free radicals. The results showed that the decolorization rate of methyl violet was 92. 4% when the temperature was 60 ℃. The decolorization rate of methyl violet increased with the increase of pH in the range of 3 ~ 9. And the addition of sodium persulfate was beneficial to the decolorization rate of methyl violet. When the concentration of sodium persulfate reached 1 mmol/L,the decolorization rate of methyl violet significantly increased to 95. 5%. However,continually increasing the dosage of sodium persulfate,methyl violet bleaching rate decreased.Free radical scavenging experiments showed that the decolorization of methyl violet was mainly due to the effect of·SO_4~- on the activation of sodium persulfate under acidic conditions. Under alkaline conditions,·OH palyed a key role in the decolorization of methyl violet.
引文
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[3]许海辉,赵贤广,刘志英,等.催化铁内电解法处理印染废水的研究[J].工业水处理,2017,37(4):25-28.
[4]岳秀,唐嘉丽,于广平,等.双氧水协同生化法强化处理印染废水[J].环境科学,2017,38(9):3769-3780.
[5]郭幸斐,王姚武,张宏伟,等.类芬顿试剂对亚甲基蓝的降解研究[J].环境科学与技术,2016,39(5):38-41.
[6]王大扬,王明铭,张学真,等.硫酸根自由基降解二级出水中有机物的研究[J].环境工程,2017,35(4):20-25.
[7]杨广超,田凯勋,孙仁超,等.零价铁/过硫酸钾降解对氯苯酚模拟废水[J].环境工程学报,2016,10(8):4228-4232.
[8]廖云燕,刘国强,赵力,等.利用热活化过硫酸盐技术去除阿特拉津[J].环境科学学报,2014,34(4):931-937.
[9]刘占孟,占鹏,李静,等.零价铁活化过硫酸盐处理渗滤液生化尾水[J].中国给水排水,2016(9):112-115.
[10]马京帅,吕文英,刘国光,等.热活化过硫酸盐降解水中的普萘洛尔[J].环境化学,2017,36(2):221-228.
[11]邓靖,冯善方,马晓雁,等.热活化过硫酸盐降解水中卡马西平[J].化工学报,2015(1):410-418.
[12]高乃云,胡栩豪,邓靖,等.紫外激活过硫酸盐降解水中卡马西平研究[J].华中科技大学学报(自然科学版),2013,41(12):117-122.
[13]顾小钢,吕树光,徐旻辉,等.紫外活化过硫酸钠技术处理水溶液中的1,1,1-三氯乙烷[J].环境科学研究,2012,25(12):1393-1397.
[14]国伟林,高丽,姬广磊,等.甲基紫染料废水的微波诱导催化降解[J].济南大学学报(自然科学版),2006,20(3):213-215.
[15]刘志强,闫正,李庆玲,等.超声波/Mg协同降解甲基紫废水[J].水处理技术,2015,41(3):15-18.
[16]朱杰,罗启仕,郭琳,等.碱热活化过硫酸盐氧化水中氯苯的试验[J].环境化学,2013(12):2256-2262.
[17]Oh S,Kim H,Park J,et al.Oxidation of polyvinyl alcohol by persulfate activated with heat,Fe2+,and zero-valent iron[J].Journal of Hazardous Materials,2009,168(1):346-351.
[18]Konstantinou I K,Albanis T A.Ti O2-assisted photocatalytic degradation of azo dyes in aqueous solution:Kinetic and mechanistic investigations[J].Applied Catalysis B:Environmental,2004,49(1):1-14.
[19]Ismail L,Ferronato C,Fine L,et al.Elimination of sulfaclozine from water with SO-4radicals:Evaluation of different persulfate activation methods[J].Applied Catalysis B:Environmental,2017,201:573-581.
[20]Zrinyi N,Pham A L.Oxidation of benzoic acid by heat-activated persulfate:Effect of temperature on transformation pathway and product distribution[J].Water Research,2017,120:43-51.
[21]Carol L,Clifton R E H.Rate constants for hydrogen abstraction reactions of the sulfate radical,SO-4Alcohols[J].Chemical Kinetics,1989,21(8):677-687.
[22]Chen Y,Yang S,Wang K,et al.Role of primary active species and Ti O2surface characteristic in UV-illuminated photodegradation of Acid Orange 7[J].Journal of Photochemistry and Photobiology A:Chemistry,2005,172(1):47-54.
[23]Buxton G V.Critical Review of rate constants for reactions of hydrated electrons,hydrogen atoms and hydroxyl radicals(·OH/·O-in Aqueous Solution[J].Journal of Physical and Chemical Reference Data,1988(17):513.