Education Ministry Key and International Joint Lab of Resource Chemistry and Shanghai Key Lab of Rare Earth Functional Materials , Shanghai Normal University , Shanghai 200234 , People's Republic of China.
Environ Sci Technol. 2018 Jul 17;52(14):7842-7848. doi: 10.1021/acs.est.8b00946. Epub 2018 Jul 5.
The introduction of a piezoelectric field has been proven a promising method to enhance photocatalytic activity by preventing photoelectron-hole recombination. However, the formation of a piezoelectric field requires additional mechanical force or high-frequency ultrasonic baths, which limits its potential application on industrial scale. Therefore, it is of great practical significance to design the catalyst that can harvest the discrete energy such as the fluid mechanical energy to form the electric field. Herein, PZT/TiO catalyst with a core-shell configuration was prepared by a simple coating method. By collecting the mechanical energy of water, an internal piezoelectric field was induced. Under 800 rpm stirring, transient photocurrent measured on PZT/TiO electrode is about 1.7 times higher than that of 400 rpm. Correspondingly, the photocatalytic degradation rate and mineralization efficiency of RhB, BPA, phenol, p-chlorophenol much improved, showing the promoting effect of piezoelectric field generated directly from harvesting the discrete fluid mechanical energy.
压电场的引入已被证明是一种通过防止光生电子-空穴复合来提高光催化活性的有前途的方法。然而，压电场的形成需要额外的机械力或高频超声浴，这限制了其在工业规模上的潜在应用。因此，设计可以收集离散能量（如流体机械能）以形成电场的催化剂具有重要的实际意义。在此，通过简单的涂层方法制备了具有核壳结构的 PZT/TiO 催化剂。通过收集水的机械能，诱导出内部压电场。在 800rpm 搅拌下，PZT/TiO 电极上测量的瞬时光电流约为 400rpm 的 1.7 倍。相应地，RhB、双酚 A、苯酚、对氯苯酚的光催化降解率和矿化效率都得到了显著提高，显示了直接从收集离散流体机械能中产生的压电场的促进作用。
