Comparison Between Dielectric Barrier Discharge Plasma and Ozone Regenerations of Activated Carbon Exhausted with Pentachlorophenol

• Published in: Plasma science & technology 2014-06, Vol.16 (6), p.608-613
• Main Author: 屈广周 梁东丽 曲东 黄懿梅 李杰
• Format: Article
• Language: English
• Subjects: Activated carbon; Adsorption; Dielectric barrier discharge; Langmuir模型; Ozone; Pentachlorophenol; Regeneration; Surface chemistry; Weight loss; 五氯酚; 再生方法; 平衡等温线; 放电等离子体; 电介质阻挡放电; 粒状活性炭; 臭氧
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/16/6/13

In this study, two regeneration methods （dielectric barrier discharge （DBD） plasma and ozone （03） regeneration） of saturated granular activated carbon （GAC） with pentachlorophe- nol （PCP） were compared. The results show that the two regeneration methods can eliminate contaminants from GAC and recover its adsorption properties to some extent. Comparing the DBD plasma with 03 regeneration, the adsorption rate and the capacity of the GAC samples after DBD plasma regeneration are greater than those after 03 regeneration. 03 regeneration decreases the specific surface area of GAC and increases the acidic surface oxygen groups on the surface of GAC, which causes a decrease in PCP on GAC uptake. With increasing regeneration cy- cles, the regeneration efficiencies of the two methods decrease, but the decrease in the regeneration efficiencies of GAC after 03 regeneration is very obvious compared with that after DBD plasma regeneration. Furthermore, the equilibrium data were fitted by the Freundlich and Langmuir models using the non-linear regression technique, and all the adsorption equilibrium isotherms fit the Langmuir model fairly well, which demonstrates that the DBD plasma and ozone regeneration processes do not appear to modify the adsorption process, but to shift the equilibrium towards lower adsorption concentrations. Analyses of the weight loss of GAC show that 03 regeneration has a lower weight loss than DBD plasma regeneration.