<br>一步法合成 Bi2O2CO3/Bi2S3 S 型异质结构，在可见光下对邻苯二甲酸二丁酯降解具有增强光活性,Chemosphere

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一步法合成 Bi2O2CO3/Bi2S3 S 型异质结构，在可见光下对邻苯二甲酸二丁酯降解具有增强光活性
Chemosphere ( IF 8.1 ) Pub Date : 2023-03-08 , DOI: 10.1016/j.chemosphere.2023.138357
Kexue Liu ₁ , Na Li ₁ , Jia Ding ₂ , Na Chen ₃ , Suo Wang ₂ , Qian Wang ₂ , Xiangfeng Yao ₁ , Xianxu Li ₁ , Jun Wang ₁ , Huanshun Yin ₂

Affiliation

采用一步水热法制备Bi2O2CO3/Bi2S3异质结，其中Bi（NO3）3作为Bi源，Na2S作为硫源，CO（NH2）2作为C源。通过改变 Na2S 的含量来调整 Bi2S3 的负载量。制备的 Bi2O2CO3/Bi2S3 对邻苯二甲酸二丁酯（DBP）降解具有很强的光催化活性。可见光照射 3 h 的降解率为 73.6%，Bi2O2CO3 和 Bi2S3 的降解率分别为 Bi2O2CO3 的 3.5 倍和 1.87 倍。此外，还研究了增强光活性的机制。与 Bi2S3 结合后，形成的异质结结构抑制了光生电子-空穴对的复合，提高了可见光吸附，加快了光生电子的迁移速率。结果，对自由基形成和能带结构的分析表明，Bi2O2CO3/Bi2S3 与 S 型异质结模型一致。S 型异质结使 Bi2O2CO3/Bi2S3 具有高光催化活性。制备的光催化剂表现出可接受的循环应用稳定性。这项工作不仅开发了一种简便的 Bi2O2CO3/Bi2S3 一步合成技术，也为 DBP 的降解提供了良好的平台。

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One-step synthesis of Bi2O2CO3/Bi2S3 S-scheme heterostructure with enhanced photoactivity towards dibutyl phthalate degradation under visible light

Bi2O2CO3/Bi2S3 heterojunction was prepared by one-step hydrothermal method, where Bi(NO3)3 was employed as Bi source, Na2S was used as a sulfur source, and CO(NH2)2 was adopted as C source. The load of Bi2S3 was adjusted by changing the content of Na2S. The prepared Bi2O2CO3/Bi2S3 illustrated strong photocatalytic activity towards dibutyl phthalate (DBP) degradation. The degradation rate was 73.6% under the irradiation of visible light for 3 h, which were 3.5 and 1.87 times for Bi2O2CO3 and Bi2S3, respectively. In addition, the mechanism for the enhanced photoactivity was investigated. After combined with Bi2S3, the formed heterojunction structure inhibited the recombination of photogenerated electron-hole pair, improved the visible light adsorption, and accelerated the migration rate of the photogenerated electron. As a result, analysis of the radical formation and the energy band structure revealed that Bi2O2CO3/Bi2S3 was consistent with the S-scheme heterojunction model. The S-scheme heterojunction allowed the Bi2O2CO3/Bi2S3 to possess high photocatalytic activity. The prepared photocatalyst presented acceptable cycle application stability. This work not only develops a facile one-step synthesis technique for Bi2O2CO3/Bi2S3, and also provides a good platform for the degradation of DBP.

更新日期：2023-03-08

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