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Citation: LIU Wen-Hong, LU Jian-Ping, YUAN Huai-BO. Improvement of Antibacterial Activity of Activated Carbon Supported Silver Modified with Citric Acid[J]. Chinese Journal of Applied Chemistry, ;2007, 24(12): 1414-1417. shu

Improvement of Antibacterial Activity of Activated Carbon Supported Silver Modified with Citric Acid

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a College of Chemical Engineering;
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b College of Biology and Food Engineering, Hefei University of Technology, Hefei 230009

Corresponding author: LIU Wen-Hong,
Received Date: 16 December 2006
Available Online: 10 March 2007
Fund Project: 安徽省高等学校青年教师科研资助计划项目(2006iq1023) (2006iq1023)合肥工业大学科学发展基金资助项目(050602F) (050602F)

Specific surface area of activated carbon(AC) treated with citric acid solution was determined by N₂ adsorption technique,and the adsorption and distribution of silver on the AC were investigated by AAS,SEM,XRD.The antibacterial activities of the AC supported silver(AC/Ag) against Staphylococcus aureus(S.aureus) and Escherichia coli(E.coli) were investigated.The results show that the citric acid modification reduced the number of cracks and cavities on the activated carbon,reducing the specific surface area of AC by about 24%,but the surface area increased after silver was leaded.The citric acid modification created more surface groups that improved the adsorption of silver ion by 25%. Silver granules became denser and smaller and more uniform after the modification.This modified AC/Ag catalyst possesses a stronger antibacterial activity for the growing of E.coli and S.aureus than the unmodified AC/Ag catalyst,and it has a stronger inhibitory effect on the growing of S.aureus than E.coli.Additionally,the citric acid modification is advantageous to the preparation of effective AC/Ag catalysts and the extraction of silver from solutions.
- activated carbon,
- silver,
- citric acid,
- modification,
- antibacterial activity
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