水热法合成BiOI及在模拟太阳光下对双酚A的降解  

Preparation of BiOI by a hydrothermal method and photodegradation of bisphenol A under simulated solar light irradiation

作　　者：毛茂乔 单国强[1] 夏佳慧 杜伟 王彤旭 董思宇 祝凌燕[1] 

机构地区：[1]南开大学环境污染过程与基准教育部重点实验室,天津市城市生态环境修复与防治重点实验室,南开大学环境科学与工程学院,天津300071

出　　处：《科学通报》2014年第31期3072-3079,共8页Chinese Science Bulletin

基　　金：教育部创新团队“污染生态化学与环境基准”(IRT 13024);天津市应用基础与前沿技术研究计划重点项目(13JCZDJC35900);国家大学生创新创业训练计划(201210055037)资助

摘　　要：双酚A是一种广泛存在于天然水体中的内分泌干扰物,其消除技术日益受到关注.利用水热法合成3D结构的碘氧化铋(BiOI)催化剂,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、紫外-可见光漫反射谱仪(UV-vis DRS)等对其进行表征,并在模拟太阳光下降解环境内分泌干扰物双酚A(BPA).实验结果表明,140℃,24 h,pH 7水热条件下制备的BiOI为片状堆砌而成的花瓣球结构,呈现最好的降解效果,在模拟太阳光下反应3 h,BPA(20 mg/L)的去除率和矿化率分别为99.6%和77.6%.三次循环实验结果显示,BiOI具有良好的抗光腐蚀性和催化稳定性.降解过程可能包含光生空穴的氧化作用.水热合成法制备BiOI简单可靠,条件可控,所制备的BiOI具有良好的应用前景.Bisphenol A（BPA） is commonly used in plastics and resins; however, concerns remain over the safety of its application, especially with regard to the contamination of foodstuffs. Here we show the facile synthesis of bismuth oxyiodide（BiOI） by a hydrothermal method that can be used to degrade BPA under simulated solar light. The catalyst phase, morphology and light absorption properties of BiOI were characterized by techniques including X-ray diffraction, scanning electron microscopy, transmission electron microscopy, optical diffuse-reflection spectra and UV-visible spectroscopy. Bismuth oxyiodide was prepared over 24 h at 140°C in a pH neutral solution and the final product displayed a microstructure of petal balls comprising flakes. Around 99.6% BPA and 77.6% TOC were removed after treatment with BiOI and 3 h of simulated solar irradiation. Photogenerated holes were essential to the degradation process, attacking the tertiary butyl carbon of BPA and forming an intermediate, 4-isopropyl phenol. After three rounds of recycling experiments, the synthesized BiOI was still photocatalytically stable, suggesting a promising candidate for the breakdown of BPA.

关 键 词：BiOI 双酚A 模拟太阳光 催化降解 水热合成 

分 类 号：X52[环境科学与工程—环境工程]