Liang Fengjuan, Wu Shijun, Chen Zhiwu, Lu Zhenya
School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
Nanomaterials (Basel). 2022 Apr 1;12(7):1170. doi: 10.3390/nano12071170.
Novel Pt/BiGdTiO heterojunction was synthesized by a decoration of Pt nanoparticles (PtNPs) on the surface of piezoelectric BiGdTiO (BGTO) through an impregnation process. The photocatalytic, piezo-catalytic, and piezo-photocatalytic activities of the Pt/BGTO heterojunction for methyl orange (MO) degradation were investigated under ultrasonic excitation and whole spectrum light irradiation. The internal piezoelectric field of BGTO and a plasmonic effect have been proven important for the photocatalytic activity of the heterojunctions. Pt/BGTO exhibited an optimum photocatalytic degradation performance of 92% for MO in 70 min under irradiation of whole light spectrum and ultrasonic coexcitation, and this value was about 1.41 times higher than the degradation rate under whole spectrum light irradiation alone. The PtNPs in Pt/BGTO heterojunction can absorb the incident light intensively, and induce the collective oscillation of surface electrons due to the surface plasmon resonance (SPR) effect, thus generating "hot" electron-hole pairs. The internal piezoelectric field produced in BGTO by ultrasonic can promote the separation of SPR-induced "hot" charge carriers and facilitate the production of highly reactive oxidation radicals, thus enhancing Pt/BGTO heterojunction's photocatalytic activity for oxidizing organic dyes.
通过浸渍法在压电材料BiGdTiO（BGTO）表面修饰铂纳米颗粒（PtNPs），合成了新型Pt/BiGdTiO异质结。在超声激发和全光谱光照射下，研究了Pt/BGTO异质结对甲基橙（MO）降解的光催化、压电催化和压电光催化活性。BGTO的内建压电场和表面等离子体效应被证明对异质结的光催化活性很重要。在全光谱光照射和超声共同激发下，Pt/BGTO对MO的光催化降解性能最佳，70分钟内降解率达92%，该值比仅在全光谱光照射下的降解率高出约1.41倍。Pt/BGTO异质结中的PtNPs能强烈吸收入射光，并由于表面等离子体共振（SPR）效应诱导表面电子集体振荡，从而产生“热”电子-空穴对。超声在BGTO中产生的内建压电场可促进SPR诱导的“热”电荷载流子的分离，并有助于生成高活性氧化自由基，从而增强Pt/BGTO异质结对有机染料的光催化氧化活性。
