研究报告

  • 田浩然,姚洁玉,彭书传,朱承驻.BiPO4/赤铁矿光催化降解气态苯乙烯[J].环境科学学报,2022,42(6):369-376

  • BiPO4/赤铁矿光催化降解气态苯乙烯
  • Synthesis of BiPO4/α-Fe2O3 and its photocatalytic degradation of gaseous styrene
  • 基金项目:国家自然科学基金(No.41772035)
  • 作者
  • 单位
  • 田浩然
  • 合肥工业大学,资源与环境工程学院,合肥 230009
  • 姚洁玉
  • 合肥工业大学,资源与环境工程学院,合肥 230009
  • 彭书传
  • 合肥工业大学,资源与环境工程学院,合肥 230009
  • 朱承驻
  • 合肥工业大学,资源与环境工程学院,合肥 230009
  • 摘要:利用水热法合成了BiPO4/赤铁矿复合催化剂,并对催化剂进行了X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱(XPS)、透射电子显微镜(TEM)、紫外可见漫反射(DRS)、BET比表面及光致发光光谱(PL)等一系列表征,同时探讨了不同制备条件下的复合催化剂对气态苯乙烯降解的影响及其光催化机理.结果表明:天然赤铁矿的负载能有效提高BiPO4光生电子-空穴对的分离效率,提升其光催化活性;当制备BiPO4/赤铁矿的条件为质量比1∶1、溶液pH=1、焙烧温度300 ℃时,复合材料对50 mg·m-3气态苯乙烯的降解率最高,达到87.9%,且在同等条件下进行4次循环实验后,降解率仅下降5.9%,稳定性得以证明.经过机理实验研究证明,BiPO4/赤铁矿复合催化剂光催化降解苯乙烯主要是 光生电子-空穴对、氧衍生的超氧自由基及羟基自由基起主导作用.
  • Abstract:BiPO4/α-Fe2O3 hybrid photocatalysts was synthesized by hydrothermally method and characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), UV-VIS reflection spectrometer (DRS), N2 adsorption-desorption measurement (BET) and photoluminescence spectroscopy (PL). The styrene degradation efficacy of hybrid catalysts prepared under different conditions and their photocatalytic mechanism were discussed. The results showed that the loading of natural hematite could effectively improve the separation efficiency of BiPO4 photoelectron-hole pair and enhance its photocatalytic activity, when the mass ratio of BiPO4 and α-Fe2O3 precursors was 1∶1,initial solution pH value was 1 and calcination temperature was 300 ℃, its degradation rate with 50 mg·m-3 styrene was 87.9%. The degradation rate only decreased 5.9% after 4 cyclic experiments under the same conditions, confirming its superior stability. Photocatalytic degradation of styrene by hybrid catalysts was mainly caused by photoelectron-hole, oxygen-derived superoxide radical and hydroxyl radical.

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