Effect of Supercritical Water Treatment on Porous Structure, Liquid-Phase Adsorption and Regeneration Characteristics of Activated Anthracite

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Sittidej Sittipraneed²  Pannada Japthong²  Virote Boon-Amnuayvitaya¹  Wiwut Tanthapanichakoon³  Tawatchai Charinpanitkul²  Kyuya Nakagawa⁴  Hajime Tamon⁴ 

[1] Department of Chemical Engineering, King Mongkut’s University of Technology Thonburi;Department of Chemical Engineering, Chulalongkorn University;National Nanotechnology Center, Thailand Science Park;Department of Chemical Engineering, Graduate School of Engineering, Kyoto University

关键词: Activated Carbon;    Activated Anthracite;    Supercritical Water;    Liquid-Phase Adsorption;    Regeneration;   

DOI  :  10.1252/jcej.39.661

来源: Maruzen Company Ltd

【 摘 要 】

References(27)Cited-By(1)Microporous activated anthracite was produced from waste anthracite powders by the conventional steam activation. The activated anthracite was also treated by supercritical water reaction (SWR) by using distilled water and hydrogen peroxide solution as a liquid medium for SWR treatment. It was found that SWR treatment can improve the mesoporosity of the activated anthracite though the micropore volume was reduced by the treatment. In liquid-phase adsorption and supercritical water regeneration studies, phenol and organic dye RED 31 were selected as the representative adsorbates. The adsorption and regeneration characteristics of activated anthracite were compared with those of a commercial activated carbon. The results indicate that the activated anthracite prepared showed comparable phenol adsorption capacity but significantly lower dye adsorption capacity than the commercial one. However, supercritical water regeneration efficiency was remarkably high. The first/second regeneration efficiencies of commercial activated carbon and activated anthracite exhausted with phenol were 55/55 and 65/65%, respectively, and in the case of RED 31, 78/79 and 338/317%, respectively, with losses of activated carbon less than 4% per regeneration. Because of little loss of activated carbon during successive regenerations, this SWR regeneration method was suitable for regenerating spent activated carbon or anthracite.

【 授权许可】

Unknown