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首页> 外文期刊>Chemical engineering journal >Highly active Bi/BiOI composite synthesized by one-step reaction and its capacity to degrade bisphenol A under simulated solar light irradiation
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Highly active Bi/BiOI composite synthesized by one-step reaction and its capacity to degrade bisphenol A under simulated solar light irradiation

机译：通过一步反应合成的高活性Bi / BiOI复合材料及其在模拟太阳光照射下降解双酚A的能力

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摘要

A novel 3D Bi/BiOI composite was synthesized by a facile one-step solvothermal method and used for the degradation of bisphenol A (BPA) in water. The solvothermal temperature and reaction time affected the chemical compositions, crystallinity and morphology of the prepared materials. The proportion of metallic Bi in the materials increased as the solvothermal temperature and reaction duration increased. The pho-tocatalyst prepared at 180 °C for 24 h (BOM 80-24) contained approximate 12.5% metallic Bi and displayed the best photocatalytic performance to BPA under simulated solar light irradiation. Metallic Bi might transfer the photogenerated electrons to O2 to produce superoxide radicals. Simultaneously, it also inhibited the recombination of the hole-electron pairs. As a result, the as prepared Bi/BiOI displayed much higher photocatalytic degradation and mineralization efficiency to BPA than pure BiOI. About 92.8% of 40 mg L~(-1) BPA was degraded after 90 min reaction using 1 g L~(-1) BOI-180-24 as catalyst under simulated solar irradiation, while 79.0% of TOC was removed at the same time. Photogenerated holes, superoxide radical species and singlet oxygen were responsible for the photodegradation while the superoxide radical species were more predominant in the Bi/BiOI photocatalytic reaction system. Only one intermediate (m/z 133) was observed by LC-MS/MS and a simple degradation pathway of BPA was proposed.
机译：通过一种简便的一步溶剂热法合成了一种新型的3D Bi / BiOI复合材料，并将其用于降解水中的双酚A（BPA）。溶剂热温度和反应时间影响所制备材料的化学组成，结晶度和形态。材料中金属Bi的比例随着溶剂热温度和反应时间的增加而增加。在180°C下制备24小时的光催化剂（BOM 80-24）含有约12.5％的金属Bi，在模拟的太阳光照射下对BPA表现出最佳的光催化性能。金属Bi可能会将光生电子转移到O2产生超氧自由基。同时，它也抑制了空穴-电子对的重组。结果，所制备的Bi / BiOI显示出比纯BiOI高得多的对BPA的光催化降解和矿化效率。在模拟太阳辐射下，以1 g L〜（-1）BOI-180-24为催化剂，反应90分钟后，降解了约92.8％的40 mg L〜（-1）BPA，同时去除了79.0％的TOC。时间。在Bi / BiOI光催化反应体系中，光生空穴，超氧自由基和单线态氧是光降解的原因，而超氧自由基则占主导地位。 LC-MS / MS仅观察到一种中间体（m / z 133），并提出了BPA的简单降解途径。

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