Enhanced catalytic and antibacterial activity of nanocasted mesoporous silver monoliths: kinetic and thermodynamic studies
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Use of low-cost heterogeneous renewable catalysts are essential for effective removal of chemical contaminants like 4-nitrophenol (4-NP) from water bodies. In the present study, for the first time use of surface enhanced (14 m2/g) nanocasted mesoporous silver monolith (AgM) through impregnation into silica monoliths (prepared by sol–gel method) has been demonstrated for its catalytic and antibacterial activity. Highly efficient catalytic reduction rate (2.43 min−1) of 4-NP to 4- aminophenol (4-AP) has been demonstrated using 0.2 gL−1 of AgM catalyst. Enhancement of reduction rate is also observed with increase in temperature (from 25 to 40 °C). Removal of microbial contamination from drinking water is also a prime concern for water purification. Mesoporous AgM shows effective antimicrobial activity against gram negative (E. coli) and gram positive (B. subtilis) bacteria with IC50 values of 75.86 ± 0.173 and 74.56 ± 0.103 respectively at 24 h of incubation.
Use of low-cost renewable catalysts is essential for effective removal of a chemical contaminant like 4-nitrophenol (4-NP) from water bodies. Nanocasted mesoporous silver monolith (AgM) synthesized via impregnation into silica monoliths (prepared by sol-gel method) has been demonstrated for its catalytic and antibacterial activity. Mesoporous AgM also showed effective antimicrobial activity against gram negative and gram positive bacteria. Open image in new window
KeywordsSilver monolith Mesoporous Nitrophenol reduction Kinetic study Antibacterial activity
SB is thankful to DAE/BRNS (Grant no: 34/14/63/2014) and DST (Grant no: SB/FT/CS-178/2013) for providing financial support to run the experiments. MS is thankful to DAE/BRNS (Grant no: 34/14/63/2014) for fellowship. AM is supported by a fellowship from DST (Grant no: SB/FT/CS-178/2013). Authors are also thankful to Thapar University for providing seed money and instrumental facilities.
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Conflict of interest
The authors declare that they have no competing interests.
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