Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7702990 | Ultrasonics Sonochemistry | 2018 | 5 Pages |
Abstract
Peat-moss derived biochar was used as a sonocatalyst for the degradation of rhodamine B (RhB) at different ultrasonic frequencies (40â¯kHz and 300â¯kHz). The biochar was prepared by pyrolysis of peat-moss at 300â¯Â°C under N2-saturated conditions. High removal efficiency was achieved when biochar (1000â¯mgâ¯Lâ1) was used as a sonocatalyst in the 40â¯kHz system, and high removal could be achieved by pre-adsorption and radical oxidation reactions on the surface of the biochar. This was validated in experiments employing radical scavengers. Sonochemiluminescence images and real images of the systems with no biochar, 100â¯mgâ¯Lâ1 biochar, and 1000â¯mgâ¯Lâ1 biochar also supported this observation. On the other hand, the addition of the biochar was less effective than expected for the degradation of RhB at 300â¯kHz. This was due to low dispersion of the biochar in solution in the high frequency system, where relatively weaker sonophysical effects could be obtained.
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Physical Sciences and Engineering
Chemistry
Chemistry (General)
Authors
Jeonggwan Kim, Beomguk Park, Younggyu Son, Jeehyeong Khim,