Department of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea; Soil Environment Center, Korea Environmental Industry & Technology Institute, Seoul 03367, Republic of Korea.
Department of Civil, Environmental and Architectural Engineering, Korea University, Seoul 02841, Republic of Korea.
Ultrason Sonochem. 2018 Apr;42:26-30. doi: 10.1016/j.ultsonch.2017.11.005. Epub 2017 Dec 22.
Peat-moss derived biochar was used as a sonocatalyst for the degradation of rhodamine B (RhB) at different ultrasonic frequencies (40 kHz and 300 kHz). The biochar was prepared by pyrolysis of peat-moss at 300 °C under N-saturated conditions. High removal efficiency was achieved when biochar (1000 mg L) was used as a sonocatalyst in the 40 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, 100 mg L biochar, and 1000 mg L 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 300 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.
以泥炭藓衍生的生物炭为超声催化剂，在不同超声频率（40 kHz 和 300 kHz）下对罗丹明 B（RhB）进行降解。生物炭是在 N2 饱和条件下于 300°C 热解泥炭藓制得。当在 40 kHz 体系中使用 1000 mg·L-1 的生物炭作为超声催化剂时，可获得很高的去除效率，这是通过在生物炭表面上的预吸附和自由基氧化反应实现的。该结论通过自由基清除剂实验得到验证。无生物炭、100 mg·L-1 生物炭和 1000 mg·L-1 生物炭的体系的声致发光图像和实时图像也支持这一观察。另一方面，在 300 kHz 下，添加生物炭对 RhB 的降解效果不如预期。这是由于在高频体系中生物炭在溶液中的分散性较差，导致获得的超声物理效应相对较弱。
