【摘要】 光催化氧化降解水中的有机物被认为是一种很有前途的水处理高级氧化技术,设计和制备能够利用可见光的催化剂是这一技术的关键.以Ta2O5为原料,经高温气固相氮化反应制备了可用于可见光下的新型光催化剂TaON,并通过光还原法制备了Pt/TaON.利用XRD、XPS等测试技术对样品进行表征,发现所制备样品中存在晶格缺陷,其化学组成为非化学计量,可表示为TaOxNy.UV-VIS测试表明其光谱响应范围拓展到了可见光区.在模拟太阳光的氙灯照射下,对TaON及Pt/TaON进行了光催化降解苯酚的研究,结果表明,TaON表面沉积贵金属Pt能提高苯酚的光催化降解率.在本实验条件下,Pt沉积量为1.5%(质量分数)、光照时间达120 min时苯酚降解率达到92%,比纯TaON对苯酚的降解率提高了11%.更多还原

【Abstract】 The degradation of organic pollutants by photocatalytic oxidation way has been taken as a promising advanced oxidation technique on water treatment.To design and prepare catalysts utilizing visible light to degrade organic pollutants,a new kind of photocatalyst TaON was prepared by nitridation of Ta2O5 at high temperature.And Pt/TaON was also prepared with photoreduction method.The prepared samples were characterized by XRD,XPS and UV-VIS,and the crystal lattice defect was found in the samples.Their chemical composition was nonstoichiometric,and might be taken as TaOxNy.UV-VIS analysis proved that the response area of the samples shifted to the visible light area.Under the irradiation of xenon lamp(λ≥420 nm),the photo-catalytic degradation of phenol with TaON or Pt/TaON as catalysts respectively indicated that TaON deposited with Pt could improve photocatalytic activity.When deposited amount of Pt was 1.5wt% and the irradiation time was 120 minutes,the photo-degradation rate of phenol reached 92%.Comparing with that of TaON as catalyst,it increased 11%.更多还原