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Green Synthesis Of Silver Nanoparticles Using Cellulose Extract From A Water Pollutant Weed, Water Hyacinth And Their Antibacterial Activity.

Congress: 2015
Author(s): Tanki Mochochoko, Oluwatobi .S Oluwafemi, Denis. N Jumbam
Lesotho Agricultural college1, Cape Peninsula University of Technology2, Walter Sisulu University3

Keyword(s): Sub-theme 6: Links with the energy, food and environmental sectors,
AbstractWater hyacinth (WH) (Eichhornia crassipes) is one of the abundant deadly aquatic species. This notorious aquatic weed in tropical and subtropical weather conditions is a major problem to the environment. It is notorious for impeding navigation through waters, blocking rivers and canals, clogging irrigation and hydropower systems. It also provides favourable breeding zones to disease-causing insects, and reduces biodiversity. Huge amounts of money are spent worldwide to eradicate this weed using methods such as chemical, biological, and mechanical which are aimed at total eradication of WH without making good use of the plant. Moreover, some of the above-mentioned methods cause environmental pollution and destruction of other useful plants. Thus, eradication of WH from water bodies and its utilisation towards man's advantage has become source of concern. WH is rich in fibre content. However, there are no studies indicating its use in the synthesis of silver nanoparticles (Ag-NPs). Ag-NPs have generated a lot of interest because of their strong antimicrobial activity against many pathogens. In this study, as part of the quest to save the environment, we report a simple synthesis of Ag-NPs using hydrolysed and unhydrolysed cellulose extracted from WH as both reducing and capping agents. By varying the reaction time, we monitored the change in position and amplitude of the localized surface plasmon resonance (LSPR) band using UV-Vis spectroscopy. The structural properties of the colloidal Ag-NPs were monitored using Fourier transform infrared spectroscopy (FTIR), and transmission electron spectroscopy (TEM). The TEM images showed well-defined monodispersed, spherical particles while the FTIR analysis confirmed the capping of the Ag-NPs by cellulose extract. The AgNPs produced showed good antimicrobial activity against Bacillus cereus, Neisseria gonorrhoea.
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