Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 421, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126696
Keywords
2D g-C3N4; Piezoelectricity; Photopiezocatalysis; Chlorophenols degradation
Categories
Funding
- National Key Research and Development Program of China [2017YFE0127400]
- Zhejiang Provincial Natural Science Foundation of China [LY20B070001]
- Science Fund of Zhejiang Sci-Tech University [21062255-Y]
- Zhejiang Xinmiao Talents Program [2019R46003]
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This study demonstrates the enhanced degradation of chlorophenols using 2D ultrathin g-C3N4 nanosheets with intrinsic piezoelectricity through a photopiezocatalysis strategy. The improved removal efficiency is attributed to sufficient separation of free charges driven by the ultrasound-induced piezoelectric field, showing significant potential for practical applications.
Graphitic carbon nitride (g-C3N4) has been proved to be a potential photocatalyst for environment purification, but the high recombination rate of photogenerated carriers leads to the low photocatalytic efficiency. Herein, we report the enhanced degradation of chlorophenols by 2D ultrathin g-C3N4 nanosheets with intrinsic piezoelectricity through photopiezocatalysis strategy. Under the simultaneous visible-light irradiation and ultrasonic vibration, the 2D g-C3N4 presented improved removal efficiency for elimination of 2,4-dichlorophenol (2,4-DCP) with an apparent rate constant of 6.65 x 10(-2) min(-1), which was 6.7 and 2.2 times of the photocatalysis and piezocatalysis, respectively. The improved removal efficiency was attributed to the sufficient separation of free charges driven by the ultrasound-induced piezoelectric field in the 2D g-C3N4, which was demonstrated by the enhanced current response under photopiezocatalysis mode. Additionally, the photopiezocatalysis of 2D g-C3N4 was proved to possess well universality for removing different chlorophenols, as well as high durability and dechlorination efficiency. Finally, a possible photopiezocatalytic mechanism for removal of 2,4-DCP was proposed based on the electron paramagnetic resonance (EPR) technique and the determination of intermediates through liquid chromatography-mass spectrometry (LC-MS) analysis. This work provides a promising strategy for the design of energy-conversion materials towards capturing solar and mechanical energy in ambient environment.
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