摘要
压电材料诱导的内建电场是调节电荷转移途径和抑制载流子复合的最有效策略之一。采用水热和溶胶凝胶两步法制备了PbTi0.85Ni0.15O3/TiO_(2)纳米棒阵列复合材料。通过降解有机染料,复合材料展现了优异的压电光催化性能。经30 min,PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)对亚甲基蓝(MB)的压电光催化降解率达到97.3%,降解反应速率为0.1215 min^(-1),是光催化降解速率(0.0372 min^(-1))的3.3倍,是压电催化降解速率(0.0211 min^(-1))的5.7倍。掺杂Ni后,带隙降低,载流子浓度增大,晶格畸变增大,压电光催化性能增强。添加牺牲剂实验和电子自旋共振波谱(ESR)实验结果表明,压电光催化降解中,·O_(2)^(-)和·OH是最主要的活性物质。此外,PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)对不同染料的降解和循环5次后的降解率表明复合材料对多种染料具有良好的压电光催化降解性能和良好的稳定性。根据能带排列,提出压电极化导致的能带倾斜和弯曲可以促进光生载流子分离,从而使PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)具有优异的压电光催化染料降解性能。
The built-in electric field induced by piezoelectric materials has been proven to be one of the most effective strategies for regulating charge transfer pathways and suppressing carrier recombination.PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)nanorod arrays compsite were fabricated via a two-step process comprising hydrothermal and sol-gel methods.By degrading organic dyes,composite materials exhibit excellent piezo-photocatalytic performance.After 30 minutes,the piezo-photocatalytic degradation rate of methylene blue(MB)by PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)reached 97.3%,with a degradation reaction rate of 0.1215 min^(-1),which is 3.3 times of the photocatalytic degradation rate(0.0372 min^(–1))and 5.7 times of the piezoelectric catalytic degradation rate(0.0211 min^(–1)).After doping Ni,the band gap decreases,the carrier concentration increases,the lattice distortion increases,and the piezo-photocatalytic performance enhances.The results of sacrificial agent addition experiments and electron spin resonance spectroscopy(ESR)experiments indicate that·O_(2)^(-) and·OH are the main active spices in piezo-photocatalytic degradation.After doping Ni,the band gap decreases,the carrier concentration increases,and the lattice distortion increases,resulting in superior piezophotocatalytic performance of PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)compared to PbTiO_(3)/TiO_(2).In addition,the degradation of different dyes by PbTi_(0.85)Ni_(0.15)O_(3)/TiO_(2)and the degradation rate after 5 cycles indicate that the composite material has good piezo-photocatalytic degradation property for various dyes and good stability.According to the energy band arrangement,it is proposed that the tilting and bending of the energy band caused by piezoelectric polarization can promote the separation of photogenerated carriers,so that dye degradation has excellent piezoelectric photocatalytic performance.
作者
周小桔
钱俊
胡正龙
任一鸣
ZHOU Xiaoju;QIAN Jun;HU Zhenglong;REN Yiming(School of Electronic and Information Engineering,Laboratory of Optoelectronic Information and Intelligent Control,Hubei University of Science and Technology,Xianning 437100,China;School of Electronics and Information Engineering,Wuzhou University,Wuzhou 543002,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2024年第3期1367-1377,共11页
Acta Materiae Compositae Sinica
基金
国家自然科学基金(5150211)
湖北科技学院科研项目(2020-22 GP08)
横向项目(2023 HX031)。
