Improved photocatalytic properties of Fe(III) ion doped Bi2MoO6 for the oxidation of organic pollutants
Improved photocatalytic properties of Fe(III) ion doped Bi2MoO6 for the oxidation of organic pollutants
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DOI：
10.1016/j.ceramint.2020.10.165
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发表时间：
2020-10
影响因子：
5.2
通讯作者：
Luyue Yang;Chunyan Du;Shiyang Tan;Zhuo Zhang;Jiahao Song;Yihai Su;Yin Zhang;Shitao Wang
中科院分区：
文献类型：
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作者：
Luyue Yang;Chunyan Du;Shiyang Tan;Zhuo Zhang;Jiahao Song;Yihai Su;Yin Zhang;Shitao Wang
通过掺杂离子提高电子空穴对的分离率是提高光催化活性的有效手段，已引起人们对开发高效光催化材料的研究兴趣。为提高可见光（λ > 420 nm）照射下罗丹明B（RhB）等有机污染物的降解性能，采用简单的水热法制备了Fe 3+掺杂的Bi 2 MoO 6（Fe-Bi 2 MoO 6）复合光催化剂。当Fe 3+掺杂量为1wt%时，复合材料表现出最高的光催化活性，在可见光照射90 min后，RhB的去除率为92.4%，比纯Bi 2 MoO 6纳米片提高了66.3%。捕获实验和EPR测量证明空穴（h+）和超氧自由基（·O2−）是主要的反应物种。此外，Fe 3+的引入拓宽了Bi 2 MoO 6纳米片的光吸收范围，并作为n型杂质增加了Bi 2 MoO 6纳米片的电子密度，从而提高了光电流密度，增加了载流子捕获，延长了载流子寿命。Fe-Bi_2 MoO_6复合材料具有良好的稳定性，重复使用4次后去除率仍保持在83.2%。为实现利用太阳光去除有机污染物的实用化，制备了Fe-Bi 2 MoO 6复合光催化剂。
Improving the separation rate of electron-hole pairs by doping ion is an effective means to enhance photocatalytic activity and has aroused research interest in the development of high-efficient photocatalytic materials. To promote the degradation performance of organic pollutants like Rhodamine B (RhB) under visible light irradiation (λ > 420 nm), an Fe3+doped bismuth molybdate (Fe–Bi2MoO6) composite photocatalyst was synthesized using a simple hydrothermal technique. When the doping amount of Fe3+was 1 wt%, the composite represented the highest photocatalytic activity with 92.4% RhB removal after 90 min of visible light irradiation, which was 66.3% higher than pristine Bi2MoO6nanosheets. Trapping experiments and EPR measurements proved that the holes (h+) and superoxide radical (•O2−) were the primary reactive species. Additionally, the introduction of Fe3+broadened the light absorption range and acted as an n-type impurity to increase the electron density of Bi2MoO6nanosheets, resulting in improved photocurrent density, increasing carrier capture and prolonging carrier lifetime. Moreover, the Fe–Bi2MoO6composite had good stability, with its removal rate remaining at 83.2% after four cycles of reuse. The novel Fe–Bi2MoO6composite photocatalyst was formulated with the aim of realizing a practical method to remove organic pollutants using solar light.