Novel BP/BiOBr S-scheme nano-heterojunction for enhanced visible-light photocatalytic tetracycline removal and oxygen evolution activity
Novel BP/BiOBr S-scheme nano-heterojunction for enhanced visible-light photocatalytic tetracycline removal and oxygen evolution activity
复制标题
新型 BP/BiOBr S 型纳米异质结可增强可见光光催化四环素去除和析氧活性
DOI：
10.1016/j.jhazmat.2019.121690
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发表时间：
2020-04-05
影响因子：
13.6
通讯作者：
Huang, Juntong
中科院分区：
文献类型：
--
作者：
Li, Xibao;Xiong, Jie;Huang, Juntong
设计具有强界面相互作用和匹配能带结构的异质结光催化剂是减少光生载流子复合的有效方法。在此，将剥离的黑磷（BP）纳米片与具有较高费米能级的BiOBr纳米片偶联，从而构建了具有化学键合、更大接触界面和独特能带结构的新型层状BP/BiOBr纳米异质结。通过简便的液相超声结合溶剂热法在 BP 纳米片表面自组装 BiOBr 纳米片。 Sol-10BP/BiOBr的光催化降解四环素（TC）性能、析氧性能和H2O2产率分别是纯BiOBr的7.8、7.0和2.6倍。原位生成的H2O2和(OH)-O-中心点成为TC矿化和分解的主要活性物种。新型S型二维BP/BiOBr纳米异质结促进空间电荷分离，保留了有用的空穴电子，具有较高的氧化还原能力，这非常有利于产生更多的(OH)-O-中心点、H2O2和O-2，光催化活性大大提高。
Designing heterojunction photocatalysts with strong interfacial interaction and matched band structure is an effective way to reduce the recombination of photogenerated carriers. Herein, the exfoliated black phosphorus (BP) nanosheets were coupled with BiOBr nanosheets having higher Fermi level, and thereby it constructed a novel layered BP/BiOBr nano-heterojunction with chemically bonding, larger contact interface and unique band structures. BiOBr nanosheets were self-assembled on the surface of BP nanosheets by a facile liquid-phase ultrasound combined with solvothermal method. The photocatalytic performance for tetracycline (TC) degradation, oxygen evolution and H2O2 production rate of Sol-10BP/BiOBr was 7.8, 7.0 and 2.6 times than that of pure BiOBr, respectively. The in-situ generated H2O2 and (OH)-O-center dot became the main active species of mineralization and decomposition of TC. The novel S-scheme two-dimensional BP/BiOBr nano-heterojunction for boosting spatial charge separation retained the useful holes-electrons with higher redox ability, which was very beneficial for producing more (OH)-O-center dot, H2O2 and O-2, and the photocatalytic activity was greatly improved.