Abstract
Organo-Ag-bentonite was prepared by the attachment of cationic surfactant cetyltrimethylammonium bromide on silver(A)g-exchanged bentonite. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and energy dispersive X-ray (EDX) analysis and antibacterial assay was performed against Escherichia coli in different percentage of saline solutions through minimum inhibition concentration (MIC) method. Organo-Ag-bentonite showed higher antibacterial activity than organo-bentonite and Ag-bentonite especially in saline solution suggesting that the precipitation of AgCl in the presence of Ag-bentonite in saline solution could be avoided by the attachment of cationic surfactant on Ag-bentonite surfaces, hence increased their antibacterial activity.
Highlights
Silver (Ag) has been well known for its antibacterial [1] and medicinal properties [2]
Exploring an improved Ag based products that can control the release of Ag ions into the environment is crucial since there were some reports on the toxicity of silver nanoparticles on a common grass, Lollium multiflorum [10], freshwater alga Ochromonas danica [11] and aquatic custaceans (Daphnia magna and Thamnocephalus platyurus) [12]
There were no changes in the X-ray diffraction (XRD) patterns of both samples indicating that the structure of bentonite was stable after loaded with Ag cations [24]
Summary
Silver (Ag) has been well known for its antibacterial [1] and medicinal properties [2]. Ag based products have been widely developed nowadays as antibacterial agent. Exploring an improved Ag based products that can control the release of Ag ions into the environment is crucial since there were some reports on the toxicity of silver nanoparticles on a common grass, Lollium multiflorum [10], freshwater alga Ochromonas danica [11] and aquatic custaceans (Daphnia magna and Thamnocephalus platyurus) [12]. Some of the ideal carrier system for antibacterial agents were montmorrilonite (a type of clay) [13,14,15], kaolinite [16], zeolite [17,18,19] and bentonite [20,21]
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