Regeneration of Acid Orange 7 Exhausted Granular Activated Carbon Using Pulsed Discharge Plasmas

WANG Huijuan (王慧娟); GUO He (郭贺); LIU Yongjie (刘永杰); YI Chengwu (依成武)

doi:10.1088/1009-0630/17/10/12

Plasma Science and Technology > 2015 > 17(10): 881-886. > DOI: 10.1088/1009-0630/17/10/12

WANG Huijuan (王慧娟), GUO He (郭贺), LIU Yongjie (刘永杰), YI Chengwu (依成武). Regeneration of Acid Orange 7 Exhausted Granular Activated Carbon Using Pulsed Discharge Plasmas[J]. Plasma Science and Technology, 2015, 17(10): 881-886. DOI: 10.1088/1009-0630/17/10/12

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Regeneration of Acid Orange 7 Exhausted Granular Activated Carbon Using Pulsed Discharge Plasmas

School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China

Funds: Supported by National Natural Science Foundation of China (No. 21207052), China Postdoctoral Science Foundation (No. 20110491353) and Jiangsu Planned Projects for Postdoctoral Research Funds, China (No. 1102116C)

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Received Date: November 20, 2014

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Abstract

Abstract

In this paper, a pulsed discharge plasma (PDP) system with a multi-needle-to-plate electrodes geometry was set up to investigate the regeneration of acid orange 7 (AO7) exhausted granular activated carbon (GAC). Regeneration of GAC was studied under different conditions of peak pulse discharge voltage and water pH, as well as the modifition effect of GAC by the pulse discharge process, to fire out the regeneration efficiency and the change of the GAC structure by the PDP treatment. The obtained results showed that there was an appropriate peak pulse voltage and an optimal initial pH value of the solution for GAC regeneration. Analyses of scanning electron microscope (SEM), Boehm titration, Brunauer-Emmett-Teller (BET), Horvath-Kawazoe (HK), and X-ray Diffraction (XRD) showed that there were more mesopore and macropore in the regenerated GAC and the structure turned smoother with the increase of discharge voltage; the amount of acidic functional groups on the GAC surface increased while the amount of basic functional groups decreased after the regeneration process. From the result of the XRD analysis, there were no new substances produced on the GAC after PDP treatment.
- pulsed discharge plasma,
- acid orange 7,
- granular activated carbon,
- regenera?tion,
- pore structure,
- functional groups

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References

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