BiOI microparticles with different I/Bi molar ratios were synthesized via a facile coprecipitation method in the absence and presence of EDTA-2Na and were characterized by various techniques. Their activity were evaluated using toxic elemental mercury as model pollutant under fluorescent lamp irradiation. The presence of EDTA-2Na would lead to the production of Bi, facilitating an effective separation of electron and hole pairs due to the transfer of electrons from BiOI surface to Bi. The lower the I/Bi molar ratio, the higher the Hg⁰ removal efficiency. The superoxide radicals and holes were the main reactive species for enhanced Hg⁰ removal.

在不存在和存在EDTA-2Na的情况下，通过简便的共沉淀法合成了具有不同I / Bi摩尔比的BiOI微粒，并通过各种技术对其进行了表征。在荧光灯照射下，使用有毒元素汞作为模型污染物评估了它们的活性。EDTA-2Na的存在将导致Bi的产生，由于电子从BiOI表面转移到Bi上，因此促进了电子和空穴对的有效分离。I / Bi摩尔比越低，Hg ^0的去除效率越高。超氧自由基和空穴是提高Hg ⁰去除率的主要反应物种。