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时间:2020-03-26
《H2O2催化降解碱性品红的研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第43卷第1O期应用化工Vo1.43No.102014年1O月AppliedChemicalIndustryOet,2014FeOOH/H202催化降解碱性品红的研究曾飞虎,张青海,林继辉,林秋容(1.黎明职业大学轻纺工程学院,福建泉州362000;2.福建师范大学闽南科技学院,福建泉州362332)摘要:采用FeOOH/H:O:体系对一种碱性阳离子染料进行催化降解。考察了H:O浓度、FeOOH的投加量、碱性品红的浓度、pH对碱性品红降解的影响。结果表明,反应的较优条件是HO:浓度为60mmol/L,
2、FeOOH投加量1.0g/L;碱性品红浓度高的降解速率比较慢,浓度低的降解速率快;pH=1时,碱性品红去除率为90.9%;pH=9时,碱性品红去除率为98.9%。机理研究表明,当溶液pH小于FeOOH的零电荷点时,FeOOH表面带正电荷,与带正电荷的碱性品红之间相互排斥降低了对碱性品红的吸附作用,同时部分Fe离子发生溶解,溶解的铁离子与H:O形成Fenton体系;当溶液pH大于FeOOH的零电荷点时,FeOOH带负电荷,碱性品红因静电力被吸附在FeOOtI表面,同时与产生的羟基自由基发生反应。关键词:
3、碱性品红;羟基氧化铁;过氧化氢;羟基自由基;零电荷点中图分类号:TQ085;X703.1;O69文献标识码:B文章编号:1671—3206(2014)10—1930—05CatalyticdegradationoffuchsinwithFeOOH/H2O2ZENGFei—hu,ZHANGQing—hai,LINJi—hui,LINQiu—rong2(1.InstituteofLight—textileEngineering,LimingVocationalUniversity,Quanzhou3620
4、00,China;2.MinnanScienceandTechnologyInstitute,FujianNormalUniversity,Quanzhou362332,China)Abstract:ThecatalyticdegradationoffuchsinusingFeOOH/H2O2systemwasinvestigated.TheeffectsofH2O2concentration,FeOOHdosage,fuchsinconcentrationandpHonfuchsindegradat
5、ionwerediscussedindetail.Theresultsshowedthattheoptimumconditionswereasfollows:H2O2concentration60mmol/LandFeOOHdosage1.0g/L;Thedegradationrateoffuchsininhighconcentrationwasslow,onthecon-trary,thatinlowconcentrationwasfast;Theremovalrateoffuchsinwas90.
6、9%atpH=1,butwhichwas98.9%atpH=9;Themechanisticstudiessuggestedthatabsorptionoffuehsinwasreducedduetothere—pulsionbetweenpositivelychargeoffuchsinandpositivelychargedsurfaceofFeOOHcausedwhentheSO—lutionpHwaslessthanthepointofzerochargeofFeOOH.Meanwhile,p
7、artofferricionsdissolvedthenFentonsystemwasformedbyH2O2anddissolvedferricion;Onthecontrary,whenthesolutionpHwasmorethanthepointofzerochargeofFeOOH,thefuchsinwasabsorbedonthesurfaceofnegativelychargesurfaceofFeOOHbyelectrostaticforceandreactedwithproduce
8、dhydroxylradicals.Keywords:fuehsin;FeOOH;H2O2;hydroxylradicals;pointofzerocharge目前,高级氧化技术以Fenton体系为主。因为实现了有机废水的处理,又不会造成二次污染,改善该体系有操作运行简便,反应速度快和降解率高的了物理及生物等方法中存在的不足。研究已经证实特点,且在降解废水中具有较高的优越性J。但是FeOOH/H2O体系遵循自由基反应机理J,但是在均相Fenton体系只有
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