Upgrading coffee ground waste as activated carbon using chemical activation with Zinc Chloride and Potassium Carbonate

การปรับปรุงกากกาแฟเหลือทิ้งเป็นถ่านกัมมันต์โดยการกระตุ้นทางเคมีด้วยซิงค์คลอไรด์และโพแทสเซียมคาร์บอเนต

Name: Thanittha Khantisuk

LCSH: Activation (Chemistry)

LCSH: Carbon, Activated

LCSH: Coffee

LCSH: Potassium

LCSH: Zinc chloride

Abstract: The main objective of this work was to utilize coffee ground waste as the precursor for activated carbon production using chemical activation with zinc chloride (ZnCl2, widely used) and potassium carbonate (K2CO3, with less pollution). The effects of preparing parameters, namely the weight ratio of coffee ground waste to activating agent (WR), activation temperature and activation time, on iodine number, were studied in order to seek an optimum activation condition for producing activated carbon. The resulting activated carbons were classified by iodine number requirement of TISI (Thailand Industrial Standard Institute). In addition, all data were statistically analyzed by ANOVA and LSD at 95% confidence interval. Based on the results of the experiment, it was concluded that coffee ground waste can be utilized as an alternative precursor for activated carbon production. The optimum condition of activation using ZnCl2 was 1:3 of WR at a temperature of 800ºC with a retention time of 3 h, giving a yield of 44.8 % with an iodine number of 901 mg/g and SBET of 1,088 m2/g. In the case of K2CO3, the optimum activation condition was 1:2 of WR at a temperature of 800ºC with a retention time of 2 h, giving a yield of 18.4 % with an iodine number of 1,190 mg/g and SBET of 943 m2/g. In addition, these results show that the optimum WR and activation time for K2CO3 is lower than that of ZnCl2, indicating less cost and energy consumption, and, it is a benign chemical. Therefore, it is reasonable to assume that K2CO3 is considerably better as an activating agent alternative.

Mahidol University

Address: NAKHON PATHOM

Email: liwww@mahidol.ac.th

Name: Aurapin Eamsiri

Role: Thesis Advisors

Created: 2005

Modified: 2553-04-22

Issued: 2010-04-02

ISBN: 9740459722

CallNumber: TH T367u 2005

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Appropriate Technology for Resources and Environmental Development

Grantor: Mahidol University

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