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ZHAO Zi-ke, CHEN Chun-liang, KE Sheng, ZHAO Li-rong, ZHANG Ji-biao, LI Jian. Adsorption Kinetics of Low Mercury Solution with Durian Shell and Activated Carbon[J]. Rock and Mineral Analysis, 2022, 41(1): 90-98. DOI: 10.15898/j.cnki.11-2131/td.202106010069
Citation: ZHAO Zi-ke, CHEN Chun-liang, KE Sheng, ZHAO Li-rong, ZHANG Ji-biao, LI Jian. Adsorption Kinetics of Low Mercury Solution with Durian Shell and Activated Carbon[J]. Rock and Mineral Analysis, 2022, 41(1): 90-98. DOI: 10.15898/j.cnki.11-2131/td.202106010069
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Adsorption Kinetics of Low Mercury Solution with Durian Shell and Activated Carbon

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  • BACKGROUNDThe direct discharge of Hg(Ⅱ) is harmful to the environment. At present, activated carbon is used to remove it, but the production of activated carbon through high-temperature pyrolysis and activation is very expensive.OBJECTIVESTo investigate the adsorption difference and mechanism on low-concentration Hg(Ⅱ) for durian shell, coconut shell activated carbon and activated carbon fiber under different conditions.METHODSThe remaining Hg(Ⅱ) in the adsorption solution was determined by atomic fluorescence spectrometry. The adsorb kinetic parameters of different adsorbents were determined by Lagergren pseudo-second-order kinetic model.RESULTSIn the Lagergren pseudo-second-order kinetic model, the maximum adsorption capacity (QM) of the three materials was as follows: activated carbon fiber (5.61μg/g)>durian shell (1.68μg/g)>coconut shell activated carbon (0.96μg/g). The adsorption test and thermodynamic equation showed that the adsorption of Hg(Ⅱ) by the three materials was spontaneous (ΔG < 0). The adsorption of Hg(Ⅱ) by coconut shell activated carbon was mainly physical adsorption (ΔH>0), while the adsorption of durian shell was an endothermic process (ΔH < 0). Due to the increase of temperature, the adsorption rate and adsorption capacity were improved.CONCLUSIONSDurian shell from a wide range of sources can be used as an effective adsorbent to treat wastewater containing Hg(Ⅱ).

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