| Colorful dyes beautify our life,however,industrial water and bacterial pollutants from the dye production process are difficult to be completely degraded,which not only bring great damage to the ecological environment,but also seriously endanger people’s physical and mental health.Therefore,it is especially important to find a treatment technology with wide application,high degradation efficiency and no pollution to the environment.In this paper,the components and types of A-site cations were adjusted,and a series of Sr-based tungsten bronze structured niobate ferroelectric submicron powders were prepared by solid-phase reaction method,and dye degradation and antibacterial experiments were carried out under different conditions.In this paper,the prepared ferroelectric submicron powders were characterized by XRD,SEM,TEM,XPS,ultraviolet-visible spectrophotometry（UV-Vis）,electron spin resonance spectroscopy（ESR）,etc.The phase structure,morphology and catalytic properties of the prepared ferroelectric submicron powders were characterized,and the catalytic mechanism was investigated.The main results are as follows:Ba2-xSr3+xLa Nb7Ti3O30（x=0,0.2,0.4,0.6）（BSLNT）tungsten bronze ceramics were prepared using the solid-phase method.The tribocatalyzed materials with enhanced built-in electric field were constructed by modulating the spontaneous polarization properties of ferroelectric powders through strategies such as changing the components and varying the intensity of corona polarization,and the tribocatalyzed effect was further enhanced by synergistic effects with illumination.The experimental mechanistic study shows that the unbalanced electric field inside the BSLNT submicron powder is enhanced under corona polarization and illumination conditions,which promotes the transfer of surface bound charges.Among that,superoxide radicals are formed by the combination of electrons and dissolved oxygen in the water,at the same time,hydroxyl radicals are formed by the combination of holes and hydroxyl radicals in solution.Both of them are contributed to the catalytic degradation efficiency.Ba1.4Sr3.6Nd Nb7Ti3O30（BSNNT）ferroelectric submicron powder was prepared by solid-phase synthesis method,and the effect of oxygen vacancies on the tribocatalytic effect was investigated by the reduction of N2.Furthermore,heterojunctions were obtained by compounding with g-C3N4（CN）material,and their effect on the tribocatalysis was investigated.The results show that the introduction of oxygen vacancies not only reduces the valence electron barrier required for the reaction,but also reduces the complexation of electrons and holes.The ferroelectric submicron powder with built-in electric field plays a crucial role in the catalytic degradation of Z-type heterojunction Ba1.4Sr3.6Nd Nb7Ti3O30-N2/g-C3N4-2（BN2/CN-2）,and the proper band gap matching between CN and BN2 increases the electron and hole transport paths between CN and ferroelectric powder,thus enhancing the tribocatalytic effect,and the1 h degradation of Rh B reached 96.2%.Therefore,the tribocatalyzed degradation of dye wastewater can be enhanced by modulating the oxygen vacancies and constructing heterojunctions.Inactivation tests against Escherichia coli（E.coli）were performed using the prepared Z-type heterojunction BN2/CN-2.The results showed that the Z-type heterojunction BN2/CN-2 had good inhibition and inactivation effects on the bacteria after tribocatalysis.The ESR test proved that the reactive oxygen species（ROS）generated during the tribocatalytic process inhibited the growth of bacteria and inactivated them,which finally achieved the effect of tribocatalytic sterilization. |
