Abstract
In piezocatalysis the polarization field found in piezoelectric materials enables and enhances catalytic redox reactions. Here, we explore piezocatalytic dye degradation through transparent glass–ceramics containing piezoelectric crystals. 30SiO2–35Li2O–35Nb2O5 (in mol%) glass–ceramics containing varying amounts of LiNbO3 crystallites were fabricated by melt-quenching, followed by heat-treatment at a crystallization temperature of 650 °C for 2, 3 and 6 hours. During piezocatalysis, the 2 hour heat-treated sample showed up to 90% degradation of methylene blue dye within 150 min of ultrasonication, with no significant change in performance after three piezocatalysis cycles. This sample showed promising activity for degrading cationic and neutral dyes, and is optically transparent. This work demonstrates that transparent ferroelectric glass–ceramics are promising for water-cleaning applications by piezocatalysis.
Highlights
In piezocatalysis the polarization field found in piezoelectric materials enables and enhances catalytic redox reactions
All the heat-treated samples showed sharp Raman modes at 155, 238, 261, 274, 327, 365, 432, and 630 cm−1. All these Raman modes belongs to LiNbO3 crystalline phase in the heat-treated samples, as these modes were closely matched with Raman modes observed in LiNbO3 crystalline materials reported in various reports[30,31]
It is to be noted that the weak broad bands were not visible in all the heat-treated samples, which may be due to high intensity of crystalline modes of LiNbO3
Summary
In piezocatalysis the polarization field found in piezoelectric materials enables and enhances catalytic redox reactions. We explore piezocatalytic dye degradation through transparent glass–ceramics containing piezoelectric crystals. If an unpoled sample can perform piezocatalysis, the unpoled glass–ceramics containing piezoelectric crystals should be examined for piezocatalytic dye degradation applications. Physical/chemical properties of glass–ceramics can be tuned as per applications, as the crystallization can be controlled using careful selection of heat-treatment time and temperature[4,6,7] Due to these unique characteristics, glass–ceramics have large number of applications in diverse scientific fields. Transparent 30SiO2–35Li2O–35Nb2O5 (in mol%) glass–ceramics containing piezoelectric LiNbO3 crystals is explored for dye degradation using piezocatalysis process. The results showed that these glass–ceramics possessed promising piezocatalytic activity for degrading cationic and neutral dyes This works demonstrates that ferroelectric glass–ceramics are promising for water-cleaning applications by piezocatalysis
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
