Abstract
Traditional regeneration of activated carbon is usually carried out by high-temperature oxidation in industrial processes, which reduces the quality and performance of the adsorbent, thereby increasing costs and damaging the environment. In this study, a simple drying process is proposed to enable reuse of spent activated carbon. The feasibility and merits of this method were evaluated in batch and continuous adsorption modes using dyes as adsorbates. The batch adsorption results showed that the activated carbon could be reused seven times after a simple drying process, because it led to full occupancy of the activated carbon pores by adsorbate molecules. The cumulative adsorption capacities of the activated carbon were as high as 1005.3 mg/g for methyl orange (MO) and 954.8 mg/g for methylene blue (MB). Continuous adsorption experiments in a fixed-bed column demonstrated that the activated carbon column could be reused more than three times after simply drying. Moreover, dye molecules adsorbed by the activated carbon were not leached by the stream of dye solution during reuse. This drying method exhibits three main merits for reuse of activated carbon, including (1) remarkably reduced consumption of fresh activated carbon to 51.5% or below, (2) significantly increased recovery of high-value adsorbate from the liquid phase, and (3) potential integration of multiple steps for industrial adsorption processes.
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This work was financially supported by the National Natural Science Foundation of China (Grant No. 31470600).
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Tao Zhang: investigation, validation, and data curation. Songlin Zuo: conceptualization, methodology, validation, data curation, writing—original draft, supervision, funding acquisition, and project administration.
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Zhang, T., Zuo, S. Drying enables multiple reuses of activated carbon without regeneration. Environ Sci Pollut Res 30, 45097–45111 (2023). https://doi.org/10.1007/s11356-023-25481-z
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DOI: https://doi.org/10.1007/s11356-023-25481-z