發(fā)布時(shí)間：2019-02-27 15:37

【摘要】：以聚乙烯吡咯烷酮(PVP)為模板劑,乙醇(C_2H_5OH)為溶劑,鈦酸正丁酯為鈦源,氧化石墨烯(GO)為改性劑,通過靜電紡絲法和焙燒處理,得到連續(xù)納米結(jié)構(gòu)的還原氧化石墨烯/氧化鈦(RGO/Ti O_2,RT)復(fù)合纖維。所制備的RT復(fù)合纖維具有直徑小,表面的羥基自由基濃度高和光吸收性能強(qiáng)的特點(diǎn),在亞甲基藍(lán)(MB)的降解中RT比純Ti O_2和催化劑P25有更高的降解效率;并且當(dāng)控制煅燒溫度為450℃時(shí),對(duì)MB的降解效果最佳。以PVP為模板劑,二甲基甲酰胺(DMF)和乙醇為溶劑,乙酰丙酮釩為釩源,導(dǎo)電玻璃(FTO)為載體,通過靜電紡絲法制備RGO/V_2O_5/FTO(RVF)復(fù)合光電極。研究發(fā)現(xiàn)經(jīng)過500℃控溫焙燒后,PVP完全分解,附著于FTO上的RGO/V_2O_5(RV)呈納米棒狀結(jié)構(gòu);RGO的引入有效降低了光生電子-空穴的復(fù)合率,提高催化劑表面的羥基自由基濃度,使得復(fù)合光電極的催化性能明顯高于純V_2O_5/FTO(VF);另外,RGO濃度影響RVF光電催化性能,發(fā)現(xiàn)GO的加入量為5%時(shí),催化效率最高。采用相同的制備工藝,以三水硝酸銅(Cu(NO_3)_2·3H_2O)為銅源,代替GO,通過靜電紡絲法制備Cu O/V_2O_5/FTO復(fù)合光電極(CVF)。經(jīng)過500℃控溫焙燒后,材料仍保持纖維形貌,直徑分布在150-200nm之間;Cu O與V_2O_5能有效復(fù)合,構(gòu)建p-n異質(zhì)結(jié),提高光生電子和空穴的分離效率,使其光電催化活性比純V_2O_5/FTO(VF)有明顯提高;另外,Cu O與V_2O_5的比例嚴(yán)重影響其光電催化性,當(dāng)n(Cu):n(V)=1:1時(shí),CVF對(duì)MB降解效率最高,達(dá)到96%,并且具有良好的重復(fù)使用性能。采用相同的制備工藝,以鎢酸銨(H_(40)N_(10)W_(12)·x H_2O)為鎢源,制備了WO_3/V_2O_5/FTO光電極(WVF),發(fā)現(xiàn)其光電催化性能比純V_2O_5/FTO電極(VF)強(qiáng),這歸功于WO_3與V_2O_5間異質(zhì)結(jié)形成,加速光生電子-空穴對(duì)的分離;當(dāng)n(V)/n(W)為1:2時(shí)催化率最高,對(duì)MB的降解率達(dá)95%;并且具有良好的重復(fù)使用性能。
[Abstract]:Polyvinyl pyrrolidone (PVP) was used as template, ethanol (C_2H_5OH) was used as solvent, n-butyl titanate was used as titanium source, graphene oxide (GO) was used as modifier, electrospinning and roasting were carried out. Continuous nanostructured reduced graphene / titanium oxide (RGO/Ti O _ 2O _ 2, RT) composite fibers were prepared. The prepared RT composite fiber has the characteristics of small diameter, high hydroxyl radical concentration on the surface and strong optical absorption. The degradation efficiency of RT is higher than that of pure Ti O _ (2) and catalyst P _ (25) in the degradation of methylene blue (MB). When the calcination temperature is 450 鈩，

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