Abstract
The modified activated carbon (MAC) derived from commercial coconut shell activated carbon (AC) with mixture of seven metal salts was used as an adsorbent to remove target residual organic compound (sucrose) from aqueous solutions in batch modes. The results indicated that the highest adsorption capacity of sucrose onto MAC reached when the AC was modified at the ratio of impregnation of AC with mixture of seven metal salts, including nitrate silver (AgNO3), manganese nitrate (Mn (NO3)2), potassium bichromate (K2Cr2O7), nitrate cobalt (Co (NO3)2·6H2O), nitrate copper (Cu (NO3)2·3H2O), nitrate nickel (Ni (NO3)2·6H2O) and nitrate iron (Fe (NO3)2·9H2O) of 3% (w/w). The most appropriate conditions for sucrose adsorption onto MAC in batch experiments obtained at pH 7, contact time of 120 min, 800 mg MAC/50 mL of sucrose solution with initial concentration of 1500 mg/L. At this condition, the highest adsorption capacity of sucrose onto MAC reached 28.28 mg/g. The Langmuir, Freundlich, and Sips adsorption isothermal equilibrium models can adequately describe the adsorption properties of sucrose on MAC. The adsorption kinetic of sucrose onto MAC obeyed pseudo-first-order and pseudo-second-order models with the chemical sorption process. The saturated MAC was recovered by heat from an oven. The highest recovery efficiency of saturated MAC obtained at 180 °C in 120 min. The highest adsorption capacity of sucrose onto recovered MAC was 24.31 mg/g, appropriately adsorption capacity of initial MAC.
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The Authors are thankful to APTCO VN., JSC for the financial assistance to conduct this work.
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Van, H.T., Bui, T.T.P. & Nguyen, L.H. Residual Organic Compound Removal from Aqueous Solution Using Commercial Coconut Shell Activated Carbon Modified by a Mixture of Seven Metal Salts. Water Air Soil Pollut 229, 292 (2018). https://doi.org/10.1007/s11270-018-3953-4
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DOI: https://doi.org/10.1007/s11270-018-3953-4