Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 286, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.120450
Keywords
Piezo-catalysis; Piezoelectric effect; Cellulose nanocrystal; Heat treatment; Dye decomposition
Categories
Funding
- National Natural Science Foundation of China [51872264, 22179108, 51790492]
- Shaanxi Provincial Natural Science Foundation of China [2020JM-579]
- Key Research and Development Projects of Shaanxi Province [2020GXLH-Z-032]
- Doctoral Research Start-up Fund project of Xi'an Polytechnic University [107020589]
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In this study, the heat-treated cellulose nanocrystal (CNC) exhibited enhanced piezo-catalytic performance in Rhodamine B (RhB) dye decomposition. The introduction of oxygen vacancy defects during the heat treatment resulted in a higher piezoelectric effect and improved carrier separation, leading to a significant increase in the decomposition ratio of RhB dye.
In this work, the cellulose nanocrystal (CNC) heat-treated in an air atmosphere at 300 degrees C shows the enhanced piezo-catalytic performance in Rhodamine B (RhB) dye decomposition. Under 180 min ultrasonic vibration with the power of 180 W and the frequency of 40 kHz, the piezo-catalytic decomposition ratio of the heat-treated CNC for RhB (5 mg/L) can reach similar to 96.65%, far exceeding the 34.58% of the raw CNC. The improvement of the piezo-catalytic performance of the heat-treated CNC is attributed to the introduction of oxygen vacancy defects, which can cause the destruction of crystal structure symmetry and promote the carrier separation, resulting in the enhancement of piezoelectric effect of the heat-treated CNC. The free radical scavenger experiments confirm that the main active specie involved in piezo-catalysis is superoxide radical. Three recycling utilization results show that the decomposition ratio of RhB dye remains about 95% without significant loss, indicating that the heat-treated CNC possesses the good durability and high efficiency in piezo-catalysis. The introduction of oxygen vacancy defects into CNC to obtain the marvelous piezo-catalytic performance is expected to show broad application prospects in the catalytic treatment of dye wastewater.
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