Piezoelectrically induced mechano-catalytic effect for degradation of dye wastewater through vibrating Pb(Zr_0.52Ti_0.48)O₃ fibers

Abstract

Electric field modulation of magnetism and electric properties inLa-Ca-MnO3/Pb(Zr0.52Ti0.48)O3 magnetoelectric laminate J. Appl. Phys. 113, 17C712 (2013); 10.1063/1.4795871 Stress-controlled Pb(Zr0.52Ti0.48)O3 thick films by thermal expansion mismatch between substrate and Pb(Zr0.52Ti0.48)O3 filmHydrothermally synthesized piezoelectric Pb(Zr 0.52 Ti 0.48 )O 3 fibers were used as a mechano-catalyzer to degrade acid orange 7 dye wastewater via the mechano-catalytic effect, which was achieved as a product of the piezoelectric effect and the electro-catalytic effect. When subjected to mechanical vibration, the Pb(Zr 0.52 Ti 0.48 )O 3 fibers bend, which in turn induces electric charges on the surfaces of the fibers via the piezoelectric effect. The piezoelectrically induced electric charges induce chemical degradation reactions in the dye wastewater through the electro-catalytic effect. A high mechano-catalytic degradation ratio of $80% was achieved for the acid orange 7 solutions ($30 lmol/l). The piezoelectrically induced mechano-catalytic effect thus provides a highly efficient and reusable technology for dye wastewater degradation applications. V C 2014 AIP Publishing LLC. [http://dx.

Coupling Piezocatalysis and Photocatalysis in Bi4NbO8X (X = Cl, Br) Polar Single Crystals

“…Some traditional piezoelectric materials, such as BaTiO 3 and SrTiO 3 , exhibited excellent piezocatalytic activity for degrading methyl orange or producing H 2 O 2 under ultrasonic vibration . Lin et al illustrated the high piezocatalytic activity of Pb(Zr 0.52 Ti 0.48 )O 3 (PZT) fibers for acid orange 7 degradation subjected to an external mechanical vibration . In addition to traditional piezoelectrics, our group has revealed that the macroscopic polarization enhancement derived from vanadium doping endowed the pyroelectric BiOIO 3 superior piezocatalytic performance in the evolution of •O 2 − and •OH under ultrasonic irradiation; meanwhile, its photocatalytic •O 2 − and •OH production activities were also promoted .…”

Oxygen Reduction Reaction for Generating H2O2 through a Piezo‐Catalytic Process over Bismuth Oxychloride

“…[9] In at ypical piezo-catalytic process, piezoelectric materials generate an electric field with external mechanical force, which can drive charge carriers (electrons and holes) participating in redox reactions such as water splitting [7,10] or elimination of pollutants. [9,11,12] Mechanistic analysis showedt hat H 2 O 2 could be generated in situ in the electrochemical process. [13] However,i n the process of pollutant degradation through the piezo-catalytic effect, H 2 O 2 is overlooked or only regarded as one of the active species to remove the pollutantsa nd the mechanism of generating H 2 O 2 is unclear.…”

Pyroelectrically Induced Pyro-Electro-Chemical Catalytic Activity of BaTiO3 Nanofibers under Room-Temperature Cold–Hot Cycle Excitations

“…In pyro-electric material, the spontaneous polarization (Ps) dipole moment is non-zero, which results in the existence of bound polarization charges in the two opposite sides of the inner surface. When the temperature comes to a constant, the bound polarization charges are shielded by these equal and opposite absorbed charges on the surface of pyro-electric material; the result is electrically neutral [30]. When pyro-electric material is heated, the Ps density decreases as dipole The principle of pyro-electro-chemical catalysis can be described as in Figure 5: With temperature gradient (∆T), pyro-electric materials have the ability to achieve thermal-to-electric conversion.…”