Synthesis of activated carbon from spent tea leaves for aspirin removal

doi:10.1016/j.cjche.2017.11.004

摘要/Abstract

摘要： Adsorption capacity of activated carbon prepared from spent tea leaves (STL-AC) for the removal of aspirin from aqueous solution was investigated in this study. Preliminary studies have shown that treatment with phosphoric acid (H₃PO₄) increased removal efficiency of STL-AC. Characterizations on STL-AC revealed excellent textural properties (1200 m²·g^-1, 51% mesoporosity), as well as distinctive surface chemistry (1.08 mmol·g^-1 and 0.54 mmol·g^-1 for acidic and basic oxygenated groups, pH_pzc=2.02). Maximum removal efficiency of aspirin observed was 94.28% after 60 min when the initial concentration was 100 mg·L^-1, 0.5 g of adsorbent used, pH 3 and at a temperature of 30℃. The adsorption data were well fitted to the Freundlich isotherm model and obeyed the pseudo-second order kinetics model. The adsorption of aspirin onto STL-AC was exothermic in nature (ΔH^Θ=-13.808 kJ·mol^-1) and had a negative entropy change, ΔS^Θ (-41.444 J·mol^-1). A negative Gibbs free energy, ΔG^Θ was obtained indicating feasibility and spontaneity of the adsorption process. The adsorption capacity of AC-STL (178.57 mg·g^-1) is considerably high compared to most adsorbents synthesized from various sources, due to the well-defined textural properties coupled with surface chemistry of STL-AC which favors aspirin adsorption. The results demonstrate the potential of STL-AC as aspirin adsorbent.

关键词: Activated carbon, Spent tea leaves, Aspirin, Adsorption, Kinetics, Isotherm

Abstract: Adsorption capacity of activated carbon prepared from spent tea leaves (STL-AC) for the removal of aspirin from aqueous solution was investigated in this study. Preliminary studies have shown that treatment with phosphoric acid (H₃PO₄) increased removal efficiency of STL-AC. Characterizations on STL-AC revealed excellent textural properties (1200 m²·g^-1, 51% mesoporosity), as well as distinctive surface chemistry (1.08 mmol·g^-1 and 0.54 mmol·g^-1 for acidic and basic oxygenated groups, pH_pzc=2.02). Maximum removal efficiency of aspirin observed was 94.28% after 60 min when the initial concentration was 100 mg·L^-1, 0.5 g of adsorbent used, pH 3 and at a temperature of 30℃. The adsorption data were well fitted to the Freundlich isotherm model and obeyed the pseudo-second order kinetics model. The adsorption of aspirin onto STL-AC was exothermic in nature (ΔH^Θ=-13.808 kJ·mol^-1) and had a negative entropy change, ΔS^Θ (-41.444 J·mol^-1). A negative Gibbs free energy, ΔG^Θ was obtained indicating feasibility and spontaneity of the adsorption process. The adsorption capacity of AC-STL (178.57 mg·g^-1) is considerably high compared to most adsorbents synthesized from various sources, due to the well-defined textural properties coupled with surface chemistry of STL-AC which favors aspirin adsorption. The results demonstrate the potential of STL-AC as aspirin adsorbent.

Key words: Activated carbon, Spent tea leaves, Aspirin, Adsorption, Kinetics, Isotherm

Syieluing Wong, Yowjeng Lee, Norzita Ngadi, Ibrahim Mohammed Inuwa, Nurul Balqis Mohamed. Synthesis of activated carbon from spent tea leaves for aspirin removal[J]. Chinese Journal of Chemical Engineering, 2018, 26(5): 1003-1011.

Syieluing Wong, Yowjeng Lee, Norzita Ngadi, Ibrahim Mohammed Inuwa, Nurul Balqis Mohamed. Synthesis of activated carbon from spent tea leaves for aspirin removal[J]. Chin.J.Chem.Eng., 2018, 26(5): 1003-1011.

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