纳米Fe2O3的制备及其光催化降解造纸废水

l《》N《》FilN(!Nll罨l＼0lul{lc；cIlL。}{【⋯■doi：10．3969／j．issn．】671—7775．2010．06．021纳米Fe2O3的制备及其光催化降解造纸废水李爱梅，杨海真，朱亦仁(1．同济大学污染控制资源化研究国家重点实验室，海200092；2．徐州师范大学化学化I学院，江苏徐州221¨6)摘要：利用固相法、回流均匀沉淀法和超声均匀沉淀法等3种方法，制备了多种可见光响应半导体催化剂氧化铁．相同试验条件下，考察了不同制备方法和制备条件对催化荆活性的影响，并用活性最佳的氧化铁对草浆造纸废水进行了光催化降解研究．试验结果表明：微波干燥和高温煅烧均能增强FeO3的光活性，且均匀沉淀法较其他两种方法制备的催化剂光活性好；催化剂TEM和RXD检测表明催化剂颗粒平均粒径均小于50nm；废水pH：3．0，催化剂质量浓度1．0L，H，O，体积分数5％v，紫外光照3h后，COD去除率达93．1％，出水P(COD)为72g／L，达到国家最新颁布的造纸废水排放标准，且催化剂多次重复使用和废水水样放大对催化剂活性和处理试验效果影响不大．关键词：Fe20；微波干燥；高温煅烧；光催化；降解；造纸废水中图分类号：X793文献标志码：A文章编号：1671—7775(2010)06—0716—05Synthesisofnano—Fe203anditsphotocatalyticdegradationforpapermillefluentLiAimei，YangHaizhen，ZhuYiren(1．StateKeyLahoratoQ~ofPnllutionControlandResourceReuse，TongjiUniversity，Shanghai200092，China；2．CollegeofChemistO'andChemi(‘alEngineering，XuzhouNomlalUniversity，Xuzhou，Jiangsu221116，China)Abstract：High—eficiencyandlowpowerconsumptionofwastewatertreatmentisthekeytothepaper—millwastewaterdischarge．Semiconductorphotoeatalyticoxidationtechnologyhasgreatpotentialapplications．DifferentFe2O3catal~stsforlightresponseweresynthesizedbysolidphasereaction，homogeneousprecipi。tationofrefluxandultrasonic—homogeneousprocessunderdifferentdryingat-tdcalcinationconditions．Un—derthesalnecondition，theinfluenceofsynthesismethod，dryingandcalcinationconditionstophotoca—talyticactivitywereinvestigated．ThephotocatalyticdegradationefluentfromstrawpulpandpapermillwasstudiedwiththemostactiveFe，0．Theresultsshowthatmicrowavedryingandhighercalcinati0ntemperaltlrecanimprovethephotoactivityofcatalyst．Thecatalystspreparedbyhomogeneousprecipita—tionofrefluxhavebetteractivitythancatalystspreparedbyothermethods．Theaveragediametersofcata—lystsarealllessthan50nnlasobservedbyusingtransmissionelectronmicroscopeandX—ravdiffracti0npattern．TheCODremovalratereaches93．1％inthepresenceofFe2O3(1．0g／L)atpH=3．0for3hunderUVlight，andtheCODofefluentis72nlg／L，whichisintherangeoftheacceptablevaluesofthegovernmentstandard．Thephotoaetivityandphotocatalyticeficiencyareseldominflue