Biosynthesized silver supported catalysts for disinfection of Escherichia coli and organic pollutant from drinking water

Bilal, Muhammad; Khan, Sahib; Ali, Javed; Ismail, Muhammad; Khan, Muhammad Iqbal; Asiri, Abdullah M.; Khan, Sher Bahadar

doi:10.1016/j.molliq.2019.02.087

Cited by 34 publications

(12 citation statements)

References 40 publications

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“…The crystalline face-centered cubic structures of AgNPs match these planes. 32 , 33 All the peaks in the XRD pattern of AgNPs can be indexed as a standard Ag crystal (JCPDS No. 4-0783).…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

et al. 2022

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Plant-mediated nanoparticles are gaining popularity due to biologically active secondary metabolites that aid in green synthesis. This study describes a simple, environmentally friendly, dependable, and cost-effective production of silver nanoparticles utilizing Cucumis sativus and Aloe vera aqueous leaf extracts. The aqueous leaf extracts of Cucumis sativus and Aloe vera , which worked as a reducing and capping agent, were used to biosynthesize silver nanoparticles (AgNPs). The formation of surface plasmon resonance peaks at 403 and 405 nm corresponds to the formation of colloidal Ag nanoparticles. Similarly, the Bragg reflection peaks in X-ray diffraction patterns observed at 2θ values of 38.01°, 43.98°, 64.24°, and 77.12° representing the planes of [111], [200], [220], and [311] correspond to the face-centered cubic crystal structure of silver nanoparticles. Fourier transform infrared spectroscopy confirms that bioactive chemicals are responsible for the capping of biogenic silver nanoparticles. The size, structure, and morphology of AgNPs with diameters ranging from 8 to 15 nm were examined using transmission electron microscopy. Water contamination by azo dyes and nitrophenols is becoming a more significant threat every day. The catalytic breakdown of organic azo dye methyl orange (MO) and the conversion of para -nitrophenol (PNP) into para -aminophenol using sodium borohydride was evaluated using the prepared biogenic nanoparticles. Our nanoparticles showed excellent reduction ability against PNP and MO with rate constants of 1.51 × 10 –3 and 6.03 × 10 –4 s –1 , respectively. The antibacterial activity of the nanomaterials was also tested against four bacteria: Staphylococcus aureus , Klebsiella pneumoniae , Enterobacter , and Streptococcus pneumoniae . These biogenic AgNPs displayed effective catalytic and antibacterial characteristics by reducing MO and PNP and decreasing bacterial growth.

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“…The crystalline face-centered cubic structures of AgNPs match these planes. 32 , 33 All the peaks in the XRD pattern of AgNPs can be indexed as a standard Ag crystal (JCPDS No. 4-0783).…”

Section: Results and Discussionmentioning

confidence: 99%

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

et al. 2022

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“…Different kinds of nanomaterials developed such as copper [7], titanium, nickel [8], palladium [9], gold [10], and silver [11]. Among all, silver nanoparticles are the most efficient because they have a strong antimicrobial effect on fungus [12], bacteria [13], and other eukaryotic microorganisms, as theranostic [6] and antitumor agents [14]. Owing to exceptional characteristics such as excellent catalytic properties, conductivity, antibacterial activity, and chemical stability, colloidal silver is of specific interest [15].…”

Section: Introductionmentioning

confidence: 99%

Characterizations and analysis of the antioxidant, antimicrobial, and dye reduction ability of green synthesized silver nanoparticles

Riaz

Ismail

Ahmad

et al. 2020

Green Processing and Synthesis

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The current study was conducted to assess the potential of ginger rhizome extract (Zingiber officinale) for the synthesis of silver nanoparticles (AgNPs) through the green method and its mitigating activity against pathogenic bacterial strains. AgNPs were synthesized through a simple one-step approach and characterized by UV-Visible (UV-Vis) spectroscopy, powder X-ray diffraction (PXRD), transmission electronic microscopy (TEM), and energy dispersive X-rays spectroscopy (EDS). PXRD and TEM results of AgNPs showed the face central cubic structures and predominantly spherical structures with a size of 6.5 nm. EDS analysis confirms the elemental silver in nanoparticles. Moreover, the impact of the pH, as well as temperature, during the synthesis of AgNPs has also been investigated. At 25°C and pH 5, there was no significant peak for AgNPs in the absorption spectra. However, with an increase in temperature from 25°C to 85°C and pH 5 to pH 11, particles started attaining the spherical shape of different sizes due to an increase in the reduction rate. The AgNPs displayed effective results against selected pathogenic strains, Pseudomonas aeruginosa (MTCC 424), Methicillin-resistant Staphylococcus aureus (ATCC 43300), and fungus Candida albicans (KACC 30003). The prepared AgNPs exhibited excellent antioxidant activity and catalytic reduction of methyl orange with the pseudo-first-order rate constant of 3.9 × 10−3.

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“…Thus immobilization of metal nanoparticles on a solid support prevents them from aggregation, increases their surface area and facilitates their reuse. A number of support material have been used such as quartz beads, ZnO nanorods, zeolite and magnesium oxide . These support materials have considerable environmental problems and are economically expensive.…”

Section: Introductionmentioning

confidence: 99%

Plant‐supported silver nanoparticles: Efficient, economically viable and easily recoverable catalyst for the reduction of organic pollutants

Ismail

Khan

et al. 2019

Applied Organom Chemis

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Ginger rhizome powder was used for the synthesis of supported metallic nanoparticle catalysts. A simple and novel adsorption method was used for the synthesis of silver nanoparticles loaded on ginger powder (Ag/GP), copper on ginger powder (Cu/GP) and nickel on ginger powder (Ni/GP). Among these, Ag/GP showed selective reduction of methyl orange and was used for further reactions. The prepared nanomaterials were characterized through X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, fourier transform infrared spectroscopy and energy-dispersive X-ray spectroscopy. The prepared Ag/GP catalyst was employed in the catalytic reduction of 4-nitrophenol (4-NP), 2-nitrophenol (2-NP), rhodamine B, methyl red and congo red. Ag/GP showed excellent catalytic reduction activity, the rate constants being 1.26 × 10 −3 and 2.38 × 10 −3 s −1 for 2-NP and 4-NP, respectively.The turnover frequency reached 1.06 min −1 for 2-NP and 1.16 min −1 for 4-NP when using the Ag/GP catalyst. The prepared Ag/GP catalyst demonstrated outstanding activity for the degradation of a mixed solution of dyes. Also, stability and reusability of the prepared catalyst were investigated, which showed outstanding reusability up to five times and was stable up to five days. KEYWORDS dye reduction, green synthesis, pseudo first-order kinetic, reusability and stability of catalyst, turnover frequency

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Biosynthesized silver supported catalysts for disinfection of Escherichia coli and organic pollutant from drinking water

Cited by 34 publications

References 40 publications

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

Synthesis of Biogenic Silver Nanocatalyst and their Antibacterial and Organic Pollutants Reduction Ability

Characterizations and analysis of the antioxidant, antimicrobial, and dye reduction ability of green synthesized silver nanoparticles

Plant‐supported silver nanoparticles: Efficient, economically viable and easily recoverable catalyst for the reduction of organic pollutants

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