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Title: Green Synthetic of Copper and Silver Nanoparticles Applied for the Reduction of Nitroarenes and Carcinogenic Azo Dyes foe Waste Water Treatment
Authors: Ismail, Muhammad
Keywords: Physical Sciences
Issue Date: 2022
Publisher: Kohat University of Science and Technology, Kohat
Abstract: The risk of water pollution is increasing every day. According to WHO, nearly half of the developing countries population suffers from health problems, which are associated with chemically or microbiologically contaminated potable water. The existence of Escherichia coli (E. coli) in potable water almost always show fecal contamination and indicate that there is a risk of pathogenic microorganisms. In Pakistan, an estimated 0.2 million children die each year due to diarrhoea and others water born diseases. Here in the present study, powder of ginger and taro rhizome were used for the synthesis of supported metallic nanoparticles catalysts. Simple adsorption method was used for the synthesis of pure and bimetallic copper and silver nano-catalyst. The prepared catalysts were characterized through X-ray diffraction (XRD), Transmission electron microscopy (TEM), Field emission scanning electron microscopy (FESEM), and Energy dispersive X-ray spectroscopy (EDS). The prepared catalysts were employed in the disinfection of water from E. coli and catalytic reduction of chemical pollutants including 2-nitrophenol (2-NP), 4-nitrophenol (4-NP), 4-nitroaniline (p NA), 2,4,6-trinitriphenol (TNA), methyl orange (MO), congo red (CR), rhodamine B (RhB) and methyl red (MR). Among all silver supported catalysts showed excellent activities in the reduction of nitroarens and organic textile dyes. Turnover frequency for the 2-NP and 4-NP reduction were calculated and among all the taro supported silver and copper-silver bimetallic catalysts shows outstanding results and reached 230.76 and 207 h–1 respectively, while the rate constants were 5.27 × 10−3 s −1 , and 5.24 × 10−3 s −1 for 4-NP respectively. The prepared silver catalyst demonstrates excellent activity in the reduction of a mixture of dyes. Besides, stability and reusability; silver supported catalysts showed outstanding reusability up to 5 times with no loss in activity and was stable up to 5 days. The prepared catalysts were used for the water disinfection from organic pollutants and E. coli by using novel continuous column reactor. Nanotechnology provides best platform over conventional methods of water remediation from organic pollutants and microorganisms. The prepared column reactor works excellent in the remediation of organic dyes. As a compared to pure copper and silver; the bimetallic catalysts were excellent in the column and inactivate all E. coli from the raw water. Besides, the 11 prepared catalysts show very good activities against gram positive bacteria Staphylococcus aureus (S. aureus) and fungal strain Candida albicans. The plentiful and cost effective nature, excellent reusability, high stability and efficient catalytic reduction activities make our synthesized nano-catalysts suitable candidates for the water disinfection from organic pollutants and microbes.
Gov't Doc #: 25544
Appears in Collections:PhD Thesis of All Public / Private Sector Universities / DAIs.

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