Formation of two kinds of carbon with different properties by acetone decomposition using in-liquid plasma method.

Most waste solvent treatment methods involve combustion; however, such methods emit carbon dioxide and are also problematic relative to energy costs. As well as reducing carbon dioxide generate, in-liquid plasma has been used to generate valuable substances and hydrogen energy from the waste solvent. As a waste solve treatment model, decomposition of acetone using 27.12 MHz in-liquid plasma was performed at atmospheric pressure. The produced gases were H 2 , CO, CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , and CO 2, where proportion of CO 2 was less than 0.25%. Two types of carbons with different properties were obtained as byproducts during the acetone decomposition. These carbons analyzed using elemental analysis and Raman spectroscopy. The analysis results revealed that the crystallinity of the carbons different significantly. Undesirable organic matter, such as benzene, was also produced during acetone decomposition. The acetone decomposition efficiency at 407 W discharge power was 0.9 μmol J−1. • As a waste solve treatment model, decomposition of acetone using in-liquid plasma was performed. • Solidification of carbon can suppress the amount of CO 2 produced. • Two types of carbons with different crystallinity were obtained as byproducts. • The decomposition efficiency of acetone increased with the increase of discharge power. • The maximum hydrogen production efficiency was approximately 1.0 μmolJ−1. [ABSTRACT FROM AUTHOR]