简介:摘要随着工业迅速发展,传统的废水预处理和深度处理技术难以满足污染物降解和去除的要求,而Fenton氧化法作为一种高级氧化技术具有强氧化性,对废水处理处理有较好效果。本文介绍了Fenton氧化技术与光催化、电化学、微波、超声波等技术联用发展起来的类Fenton氧化技术及其应用。
简介:针对实验室废水,采用活性碳联合Fenton试剂氧化处理,探讨主要因素对COD处理效果的影响.实验结果表明,活性碳在添加量为0.45g/mL,反应30min后对废水中COD的去除率达61.32%;Fenton试剂在H2O2添加量为0.07mg/mL,FeSO4·7H2O的添加量为0.02g/mL的条件下反应60min后,对废水中COD的去除率达到59.88%;将活性碳吸附和Fenton试剂联合作用后,活性碳添加量减少了0.05g/mL,FeSO4·7H2O添加量减少了0.005g/mL,去除率可达89.23%,显著提高实验室废水中COD的去除率.
简介:ActiveFe-andMn-loadedMCM-41(Fe–Mn/MCM-41),whichwassynthesizedviaahydrothermalreactionfollowedbyimpregnation,isusedintheheterogeneousFentonreactiontodegrademethylorange(MO)inaqueoussolution.ThesynthesizedsampleswerecharacterizedbyX-raydiffraction,scanningelectronmicroscopy,transmissionelectronmicroscopy,N2adsorption–desorptionisothermanalysis,Fouriertransforminfraredspectroscopy,andX-rayphotoelectronspectroscopy.ComparedwithFe/MCM-41andMn/MCM-41,Fe–Mn/MCM-41showedhigheractivityforMOdegradationandmineralization.Effectsofvariousoperatingparameters,suchaspH,Mncontent,andH2O2dosage,onthedegradationprocessweresubsequentlyinvestigated.ResultsofexperimentsontheeffectofradicalscavengersrevealedthatthedegradationofMOcouldbeattributedtooxidationbyHO·.ThesynergyofFeandMnspeciesintheFentonoxidationprocesswasalsoexplained.
简介:消毒是水处理过程中必不可少的环节,选择合适的消毒技术也就变得至关重要。国内外学者正在寻求新型消毒技术,以消除水中致病微生物所产生的公共安全风险。紫外(UV)消毒技术具有速度快、效率高、效果好,不影响水的物理性质和化学成分,便于管理和易于实现自动化等优势。紫外发光二极管技术(UV-LED)作为一种新型紫外线源,其可替代传统紫外线汞灯的发展趋势,已经引起了极大的关注。本文对国内外UV-LED灭活水中致病微生物的研究进展进行了综述。
简介:TheinfluenceofcalcinationtemperatureonTiO2nanotubes’catalysisforTiO2/UV/O3wasinvestigated.TiO2nanotubes(TNTs)werepreparedviathesol-gelmethodandcalcinedat300—700℃,whichwerelabeledasTNTs-300,TNTs-400,TNTs-500,TNTs-600andTNTs-700,respectively.TNTswerecharacterizedbytransmissionelectronmicroscopy(TEM)andX-raydiffraction(XRD).ItisfoundthatTNTscalcinedat400℃showedthebestthermalstability.Whenthecalcinationtemperatureincreasedfrom400℃to700℃,thespecialstructureoftubeswasdestroyedandgraduallyconvertedintonanorodsand/orparticles.Thetransformationfromanatasetorutileoccurredat600℃,andtherutilephasewasenhancedwhenthecalcinationtemperaturewasincreasedtoover600℃.Thecalcinationtemperature’sinfluenceonTNTs’adsorptionactivityforchemicaloxygendemand(COD)andcatalyticactivityforTiO2/UV/O3wasinvestigatedinlandfillleachatesolution.Inlandfillleachatesolution,theadsorptionactivityofCODdecreasedinthereducedorderofTNTs-300,TNTs-400,TNTs-500,TNTs-600andTNTs-700.Inphotocatalyticozonation,TNTs-400showedthebestcatalyticactivitywhileTNTs-700exhibitedtheworst.Inotherthreeprocesses,theCODremovalofTNTs-300/UV/O3washigherthanthoseofTNTs-500/UV/O3andTNTs-600/UV/O3inthefirst20min,andthenbecameclosetothoseofthelattertwointhefollowing40min.ComparedwithTNTs-300andTNTs-400,TNTs-600hadthebestanti-foulingactivity,whileTNTs-500andTNTs-700hadloweranti-foulingactivitythantheformerthree.Inphotocatalyticozonation,thecalcinationtemperatureof400℃wasappropriatewhenTNTswereobtainedatthesynthesistemperatureof105℃.