简介:ThecaptureoforthophosphatesandtotalphosphorusfromthePudongCanalriverinthePudongDistrictofShanghaibyTiO2nanoparticlesisstudiedusingarotatingphotoreactorandthenano-TiO2photocatalystDegussaP25.TheeffectsofUVirradiationintensityinarangeof20-74mW/cm2.theloadingoftheTiO2nanoparticlesinarangeof0.05-0.1g/L,irradiationtimeupto4h,andpHvaluesinarangeof2-10.5onthecaptureefficiencyareinvestigated.TheresultsshowthatthecaptureoforthophosphatesandtotalParesignificantlyenhancedbyUVirradiation;ataloadingof0.1g/Landanirradiationintensityabove36mW/cm2,orthophosphatesandtotalphosphorusarerapidlycapturedbyTiO2nanoparticles,causinganobservedreductionfrom0.4mg/Ldownto0.02mg/L.pHvaluesinarangeof2-10.5havelittleeffectonthecaptureefficiencyoforthophosphatesandtotalphosphorus.
简介:NanostructuredandconventionalAl2O3-13wt%TiO2coatingsweremanufacturedbyairplasmaspray.FrictionandwearbehaviorsofcoatingswereinvestigatedatroomandelevatedtemperaturesusinganSRVweartestmachine.Thenanostructuredcoatinghas"tworegions"microstructure,whiletheconventionalcoatinghastypicallayeredmicrostructurewithobviousinterfacesamongsplats.Thecoefficientoffrictiondecreaseswithrisingoftemperaturebecauseoftheformationoftribo-layeratelevatedtemperatures.Thewearresistanceofthenanostructuredcoatingsishigherthanthatoftheconventionalcoating,andthewearthresholdofappliedloadis30Nforconventionalcoatingand40Nfornanostructurecoating.Thewearresistancedifferenceisrelatedtothe"tworegions"microstructureofnanostructurecoating,whichcouldbluntorbranchthecrackspropagation.Inourtestranges,thewearratesrisingaremoresensitivewiththeappliedwearloadrisingthanwiththetemperaturerising.
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简介:Byusingthebimodalmesoporoussilica(BMMS)asthecarrierandbutyltitanateasthetitaniumsource,theTiO2/BMMScatalystwasprepared.ThesampleswerecharacterizedbyXRD,XRF,N2adsorptionanddesorption,FTIR,UVvis,SEM,EDS,andTEMtechniques.ThetestresultsshowedthatTiO2wasamorphous,theTiO2/BMMScatalysthadanorderedbimodalmesoporousstructure,andthechemicalinteractionexistedbetweenBMMSandTiO2.SincetheTiO2/BMMShadalowerbandgap,itsphotocatalyticactivitywasbetterthanTiO2.UnderUVirradiationaone-potPODSsystemwassetup,usingTiO2/BMMSasthecatalyst,H2O2astheoxidant,andmethanolasthesolvent.TheTiO2/BMMScatalystshowedbetterphotocatalyticactivitythanthemono-modalmesoporousTiO2/SBA-15catalyst,andthedesulfurizationrateofdibenzothiophene(DBT)overTiO2/BMMScatalystcouldreach99.2%.TheTiO2/BMMScatalystalsohadsogoodstabilitythatthedesulfurizationrateofDBTdidnotdropapparentlyafter8cyclesofreusing,andcouldstillbecloseto90%.
简介:摘要 本文分析TiO2对烧结利用系数、转鼓强度以及冶金性能的影响,采取提高SiO2/TiO2比值、提高料层厚度和配碳量、配加氧化锰、氧化硼、萤石等措施,改善烧结矿质量和利于高炉稳定顺行。
简介:摘 要:生物腐蚀会危害建筑物并造成经济损失。在金属和建筑材料的腐蚀破坏中该现象占20%。因此,如何减少生物腐蚀对于建筑物的影响成为一个热门话题。石墨尾矿伴生物中含有TiO2和V2O5,两种物质具备光催化降解杀菌的能力,可以基于其光催化性能,对于有机物分解而具有抗菌效果。目前,我国天然石墨储量为5200万吨,而石墨尾矿的排放量是矿石产量的近10倍,石墨尾矿通常是作为固体废料排放至尾矿库中,与尾矿库中充斥各种矿业开采和选矿过程中产生的废水混合,不仅造成土地资源浪费,而且尾矿大量堆积,还会对生态环境造成毁灭性打击,危害人体和财产的安全。本文主要针对TiO2抗菌机理和影响因素进行总结分析,为其利用石墨尾矿固体废物提供新出路。
简介:文章以蒙脱土(MMT)和TiO2纳米管为载体材料,以纤维素及其复合物作为模板制备cell-g-p4vp/MMT和cell-g-p4vp/TiO2/MMT光催化剂复合材料,利用FT-IR方法验证TiO2在蒙脱土上的固定效果;利用XRD方法表征TiO2合成情况以及蒙脱土层的有效剥离;利用SEM方法研究纤维素及其聚合物作为模板对于TiO2带来的影响。同时,结合紫外可见光谱对TiO2纳米管/蒙脱土复合材料光催化降解苯酚的结果。研究结果表明,蒙脱土能够有效抑制TiO2的晶型转变,当溶液的pH值等于4,溶液浓度为100mg/L,催化剂的用量为0.2g时,复合材料对于甲基橙具有良好的光催化降解效果。
简介:在他们的photocatalytic/photoelectro-catalytic表演之上的TiO2nanotube数组(TNA)的结构的参数的效果被把词法特征和物理化学的性质与不同试管长度从三种电解质准备了作比较学习。结果证明与试管长度的增长转移红的TNA和短TNA的紫外力的吸收边拥有更高的bandgap精力。TNA的电气化学的窗户的变化趋势是DMSO(5.5V)>市民(3.2V)>HF(1.8V)。长TNA拥有更高的photocatalytic(PC)反应建议表面粗糙因素是PC效率的主要决定因素,尽管,为长TNA有明显的再结合效果。从一样的电解质为TNA由在试管长度和photoelectrocatalytic(PEC)效率之间的积极关联证实了,试管长度的改进能导致更好的PEC反应,但是当试管长度在某个价值上时,PEC降级率不再增加,但是减少。有从市民和DMSO电解质准备的大表面粗糙因素的长TNA与从HF电解质准备的短TNA相比展出比较或平的更低的PEC性能,显示TNA的PEC表演被费用分离和光电子转移性质而非表面粗糙系数和试管长度统治。
简介:以钛酸四丁酯为前驱体,采用溶胶一凝胶一超声波法制备得到了纳米TiO2溶胶,在单面抛光的硅片上采用旋转涂膜法涂上TiO2溶胶,快速烘干,再经烧结得到TiO2薄膜,并利用XRD,XPS与AFM对其结构性能进行表征,结果表明,膜厚度大约可控在3-5nm,膜表面颗粒大小约20nM,膜的组成主要为锐钛矿型TiO2和少量有机碳化物。在制备TiO2薄膜时,发现膜层随着镀膜次数变化显示不同的颜色差异,并有着良好的对应关系。以此现象入手研究不同颜色的TiO2薄膜在同一光催化条件下甲醛的降解分析,实验结果发现呈蓝色光的TiO2薄膜表现良好的光催化效果,其原因可能是蓝色光对光的吸收较好。
简介:PhotocatalystwaspreparedbyimmobilizingTiO_2onglassbeadsusingthetradi-tionalsol-gelmethod.Ultravioletlight(UV)producedbypulsedstreamerdischargewasthenusedtoinducephotocatalyticactivityofTiO_2photocatalyst.Decolourationefficiencyoftherep-resentativeazodye(acidorange7,AO7)wasinvestigatedusingthesynergisticsystemofpulsedstreamerdischargeplasmaandTiO_2photocatalysis.Theobtainedresultsshowedthatthede-colourationrateofAO7couldbeincreasedby16.7%undertheconditionofaddingsupportedTiO_2inthepulsedstreamerdischargesystem,comparedtothatinthesolepulsedstreamerdischargeplasmasystem,duetothesynergisticeffectofpulsedstreamerdischargeandTiO_2photocatalysisinducedbypulsedstreamerdischarge.ThesynergisticsystemofpulsedstreamerdischargeandTiO~photocatalystwasfoundtohavemorereactiveradicalsfordegradationoforganiccompoundsinwater.