Abstract
A pyro-electro-chemical catalytic dye decomposition using lead-free BaTiO3 nanofibers was realized under room-temperature cold–hot cycle excitation (30–47 °C) with a high Rhodamine B (RhB) decomposition efficiency ~99%, which should be ascribed to the product of pyro-electric effect and electrochemical redox reaction. Furthermore, the existence of intermediate product of hydroxyl radical in pyro-electro-chemical catalytic process was also observed. There is no significant decrease in pyro-electro-chemical catalysis activity after being recycled five times. The pyro-electrically induced pyro-electro-chemical catalysis provides a high-efficient, reusable and environmentally friendly technology to remove organic pollutants from water.
Highlights
Organic dyes from printing, textile, and tanning industries are one of the most harmful pollutants in wastewater [1,2]
The resultant H2 Ti3 O7 powder was dispersed in 60 mL of 0.05 M Barium hydroxide aqueous solution to fully transfer H2 Ti3 O7 nanofibers to BaTiO3 nanofibers
It can be seen that this X-ray diffraction (XRD) pattern can be indexed to the pure tetragonal phase of BaTiO3 (JCPDS, 05-0526)
Summary
Organic dyes from printing, textile, and tanning industries are one of the most harmful pollutants in wastewater [1,2]. To decompose those organic dye pollutants, various methods have been developed, such as physical technologies, biological processes and semiconductor-based photo-catalysis. There still exist many defects in such technologies. Physical technologies such as adsorption on activated carbon, flocculation and reverse osmosis can only transfer dyes from liquid phase to solid phase apart from the secondary pollution problem [3,4,5].
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