Synthesis of activated carbon from spent tea leaves for aspirin removal

Syieluing Wong; Yowjeng Lee; Norzita Ngadi; Ibrahim Mohammed Inuwa; Nurul Balqis Mohamed

doi:10.1016/j.cjche.2017.11.004

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Synthesis of activated carbon from spent tea leaves for aspirin removal

Separation Science and Engineering | Updated：2026-01-06

- Synthesis of activated carbon from spent tea leaves for aspirin removal
- Chinese Journal of Chemical Engineering Vol. 26, Issue 5, Pages: 1003-1011(2018)
- Affiliations：
  
  2 Department of Industrial Chemistry, Kaduna State University, Kaduna,Nigeria
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2017.11.004
  CLC：
- Published：2018
- Accepted：
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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.
DOI：

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. DOI： 10.1016/j.cjche.2017.11.004.

摘要

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 (H

) increased removal efficiency of STL-AC. Characterizations on STL-AC revealed excellent textural properties (1200 m

·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

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

=-13.808 kJ·mol

-1

) and had a negative entropy change

ΔS

(-41.444 J·mol

-1

). A negative Gibbs free energy

ΔG

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.

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