新型可见光催化剂BiVO4降解中成药制药废水
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2020-03-17 11:16:20
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第6卷第3期环境工程学报Vol.6,No.32012年3月ChineseJournalofEnvironmentalEngineeringMar.2012新型可见光催化剂BiVO4降解中成药制药废水陈渊1,2杨家添1谢祖芳1刘国聪1,2黄湘茜1(1玉林师范学院化学与材料学院,玉林537000;2玉林师范学院新材料研发和化学生物传感技术所,玉林537000)摘要以Bi(NO3)3·5H2O和NH4VO3为原料,采用水热法制备了新型可见光BiVO4催化剂,并用X射线衍射(XRD)、扫描电子显微镜(SEM)、红外光谱(IR)和紫外可见光漫反射光谱(UVvisDRS)对产品进行了结构表征,并将其应用于光催化降解中成药制药废水降解反应中,通过正交实验和单因素分析,考察了催化剂用量、空气流量、溶液pH值和助氧化剂H2O2对制药废水COD去除率、脱色率的影响。实验结果表明,水热产品属于单斜晶系BiVO4,其带隙能为241eV,并具有良好的可见光催化活性。对于经10倍稀释的制药废水,BiVO4添加量为2g/L,通氧量为120L/h,助氧化剂H2O2添加量为1mL,不改变废水pH值,在400W金属卤化物灯离液面11cm照射反应180min的条件下,制药废水的COD去除率为943%,脱色率为956%,得到了较好的降解。关键词中成药制药废水BiVO4水热法光催化降解COD去除率脱色率中图分类号TQ0324;X7031文献标识码A文章编号16739108(2012)03091309DegradationofChinesetraditionalmedicinewastewaterbynovelvisiblelightsensitiveBiVO4photocatalystChenYuan1,2YangJiatian1XieZufang1LiuGuocong1,2HuangXiangqian1(1CollegeofChemistryandMaterial,YulinNormalUniversity,Yulin537000,China;2InstituteofAdvancedMaterials&ChembiosensingTechnology,YulinNormalUniversity,Yulin537000,China)AbstractThenovelvisiblelightsensitiveBiVO4photocatalystwassynthesizedviahydrothermalprocessusingBi(NO3)3·5H2OandNH4VO3asstartingmaterialsItsstructurewascharacterizedbyXraydiffraction(XRD),scanningelectronmicroscopy(SEM),infraredspectroscopy(IR)andUVvisdiffusereflectancespectroscopy(UVvisDRS),andthephotocatalyticactivityoftheBiVO4powderswasdeterminedbydegradationofChinesetraditionalmedicinewastewaterTheeffectsofBiVO4dosage,airflowrate,pHofwastewater,H2O2dosageonthewastewaterdegradationwereinvestigatedindetailthroughtheorthogonalexperimentandsinglefactorexperimentTheresultsrevealthattheaspreparedBiVO4ismonoclinicstructurewithabandgapof241eVandexhibitsanexcellentvisiblelightphotocatalyticactivityFortheChinesetraditionalmedicinewastewaterwiththeinitialpHvalue,whentheflowrateofairisadjustedto120L/h,theamountofaddedH2O2modulatedat10mL,andtheconcentrationofBiVO4controlledto2g/L,theCODremovalrateofthewastewateris943%andthedecolorizationrateis956%afterirradiationbymetalhalidelampof400Wvisiblelightfor1
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