scholarly journals Nitrogen and Carbon Nitride-Doped TiO2 for Multiple Catalysis and Its Antimicrobial Activity

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Atif Ashfaq ◽  
Muhammad Ikram ◽  
Ali Haider ◽  
Anwar Ul-Hamid ◽  
Iram Shahzadi ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Carbon Nitride ◽  
Dye Degradation ◽  
Morphological Properties ◽  
Degree Of Crystallinity ◽  
Bandgap Energy ◽  
Fixed Amount ◽  
E Coli ◽  
Vis Spectroscopy ◽  
Co Precipitation

AbstractNitrogen (N) and carbon nitride (C3N4)-doped TiO2 nanostructures were prepared using co-precipitation route. Fixed amount of N and various concentrations (0.1, 0.2, 0.3 wt%) of C3N4 were doped in TiO2 lattice. Through multiple techniques, structural, chemical, optical and morphological properties of samples were thoroughly investigated. XRD results verified anatase TiO2 presence along the substitutional doping of N, while higher degree of crystallinity as well as increased crystallite size were noticed after doping. HR-TEM study revealed formation of nanostructures incorporated on two dimensional (2D) C3N4 nanosheet surface. Elemental composition was checked out using EDS technique which confirmed the presence of dopant in product. Optical characteristics were evaluated with UV–vis spectroscopy which depicted representative redshift in absorption spectra resulted in a reduction in bandgap energy in N/C3N4-doped TiO2 samples. The formation of Ti–O–Ti bonds and different molecular vibrations were disclosed by FTIR. Trap sites and charge carrier’s migration in the materials were evaluated with PL spectroscopy. Multiple catalytic activities (photo, sono and photo-sono) were undertaken to evaluate the dye degradation performance of prepared specimen against methylene blue and ciprofloxacin. Further, antimicrobial activity was analyzed against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria.

scholarly journals Synthesis of Silver Nanoparticles using Egg White: Dye Degradation and Antimicrobial Potential

2021 ◽  
Vol 12 (2) ◽  
pp. 2361-2372
Keyword(s):  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Dye Degradation ◽  
Egg White ◽  
Blue Dye ◽  
Second Phase ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
The Stability ◽  
And Staphylococcus Aureus

In recent years, developing nanoparticles with green processes is gaining huge attention due to its cost-effectiveness, simplicity and non–toxic precursors. The present study utilized the potential of egg white for the synthesis of stable silver nanoparticles (EW-AgNPs). In order to characterize the EW-AgNPs, various techniques have been employed. UV-vis spectroscopy (300-700nm) was used to study the λmax, which highlighted the peak at 422nm. Further, the stability of synthesized EW-AgNPs was studied using Zeta potential, the value of -16.4 mV was obtained, indicating the stability of developed EW-AgNPs in the solution. Transmission electron microscopy was used specifically to visualize the shape and size of synthesized EW-AgNPs, the images showed spherical to the diverse shape of EW-AgNPs. In the first phase, the EW-AgNPs were studied for dye degradation along with NaBH4. The enhanced dye degradation of blue dye was obtained with EW-AgNPs+NaBH4, showing 90- 100% degradation from 100- 25 mgL-1 dye solution, respectively. Further, in the second phase, antimicrobial activity (Zone of Inhibition) of EW-AgNPs was analyzed against Escherichia coli and Staphylococcus aureus. A higher ZOI was obtained for E.coli (16mm) than S. aureus (12.4mm). The present study proved egg white's ability to develop stable silver nanoparticles, which was further found to be effective for blue dye degradation and antimicrobial activity.

scholarly journals Graphene Oxide-Doped MgO Nanostructures for Highly Efficient Dye Degradation and Bactericidal Action

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
M. Ikram ◽  
T. Inayat ◽  
A. Haider ◽  
A. Ul-Hamid ◽  
J. Haider ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Dye Degradation ◽  
Inhibition Zone ◽  
Chemical Precipitation ◽  
Band Gap Energy ◽  
Cubic Phase ◽  
Electron Hole ◽  
Fixed Amount ◽  
E Coli ◽  
Spectroscopy Optical

AbstractVarious concentrations (0.01, 0.03 and 0.05 wt ratios) of graphene oxide (GO) nanosheets were doped into magnesium oxide (MgO) nanostructures using chemical precipitation technique. The objective was to study the effect of GO dopant concentrations on the catalytic and antibacterial behavior of fixed amount of MgO. XRD technique revealed cubic phase of MgO, while its crystalline nature was confirmed through SAED profiles. Functional groups presence and Mg-O (443 cm−1) in fingerprint region was evident with FTIR spectroscopy. Optical properties were recorded via UV–visible spectroscopy with redshift pointing to a decrease in band gap energy from 5.0 to 4.8 eV upon doping. Electron–hole recombination behavior was examined through photoluminescence (PL) spectroscopy. Raman spectra exhibited D band (1338 cm−1) and G band (1598 cm−1) evident to GO doping. Formation of nanostructure with cubic and hexagon morphology was confirmed with TEM, whereas interlayer average d-spacing of 0.23 nm was assessed using HR-TEM. Dopants existence and evaluation of elemental constitution Mg, O were corroborated using EDS technique. Catalytic activity against methyl blue ciprofloxacin (MBCF) was significantly reduced (45%) for higher GO dopant concentration (0.05), whereas bactericidal activity of MgO against E. coli was improved significantly (4.85 mm inhibition zone) upon doping with higher concentration (0.05) of GO, owing to the formation of nanorods.

scholarly journals SYNTHESIS, CHARACTERIZATION OF ANTIMICROBIAL ACTIVITY OF 22’DICHLOROHYDROBENZOIN

2018 ◽  
Vol 11 (12) ◽  
pp. 334
Author(s):  
Thanuja B ◽  
Charles Kanagam
Keyword(s):  
Antimicrobial Activity ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
E Coli ◽  
Vis Spectroscopy ◽  
Optical Behavior ◽  
Thermal Stability Of

Objective: The objective of this work to evaluate the antimicrobial activities of synthesized 22’dichlorohydrobenzoin (22’CD) a new organic crystal.Methods: 22’CD a new organic crystal was grown by vapor diffusion method. Single crystals of 22’CD have been subjected to X-ray diffraction analysis to estimate the lattice parameters and the space group. The molecular structure was confirmed using Fourier transform infrared and nuclear magnetic resonance (NMR) spectral analyses. Optical behavior and thermal stability of the crystal were determined using UV-Vis spectroscopy and thermogravimetry-differential thermal analysis curves. In the present study, antimicrobial activity of 22’CD was evaluated against Escherichia coli and Bacillus subtilis was evaluated by agar well diffusion method.Results: Antibacterial activity of 22’CD was analyzed with ciprofloxacin and miconazole standard and tested against E. coli, Pseudomonas aeruginosa, Salmonella paratyphi, Klebsiella pneumonia’s, Staphylococcus aureus, Streptococcus progenies, and B. subtilis.Conclusion: The 22’CD was found to be effective against E. coli and B. subtitles.

scholarly journals Synthesis, Characterization and Antimicrobial Activity of Metal Complexes of N-(4-methoxybenzylidene) Isonicotinohydrazone Schiff Base

2019 ◽  
pp. 1-8 ◽  
Author(s):  
Md. Sajjad Hossain ◽  
Farzana Khanm Camellia ◽  
Nayon Uddin ◽  
Md. Kudrat-E-Zahan ◽  
Laila Arjuman Banu ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Isonicotinic Acid ◽  
Acid Hydrazide ◽  
Molar Conductivity ◽  
Human Pathogens ◽  
Gram Negative ◽  
E Coli ◽  
Vis Spectroscopy ◽  
In Vitro Antibacterial Activity

Two complexes of Cu(II) and Ni(II) with the ligand N- (4-methoxybenzylidene) isonicotinohydrazide, having the formula [M(La)2]2+ (M = Cu(II) and Ni(II)) were synthesized. The ligand was synthesized by the condensation of isonicotinic acid hydrazide (isoniazid) with 4- methoxybenzaldehyde (p- anisaldehyde). The complexes were characterized by FTIR, UV-Vis spectroscopy, molar conductivity, magnetic susceptibility and evaluated for their in vitro antibacterial activity against human pathogens like gram negative Escherichia coli (E. coli) and gram positive Bacillus cereus (B. cereus)strains. The results indicate that all complexes consist of N and O coordination with metals has better antimicrobial activity.

scholarly journals Antimicrobial Activity of Ca-Alginate/Chitosan Nanocomposite Loaded with Camptothecin

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3559
Author(s):  
Wafa Al-Gethami ◽  
Noha Al-Qasmi
Keyword(s):  
Antimicrobial Activity ◽  
Calcium Alginate ◽  
Chemical Interaction ◽  
Genetic Material ◽  
Point Mutations ◽  
Polymerase Chain Reaction Analysis ◽  
Pcr Analysis ◽  
Klebsiella Pneumonia ◽  
E Coli ◽  
Vis Spectroscopy

The main aim of this study was to prepare antimicrobial nanocomposites consisting of alginate, chitosan, and camptothecin (CPT). CPT-loaded calcium alginate (Ca-Alg2) and calcium alginate/chitosan (Ca-Alg2-CH) nanomaterials were synthesized and characterized using infrared (IR) spectroscopy, X-ray diffraction (XRD), UV-Vis spectroscopy, and scanning electron microscopy (SEM). The antimicrobial activity and the genetic effects of Ca-Alg2/CPT and Ca-Alg2-CH/CPT nanomaterials on Staphylococcus aureus, Escherichia coli, and Klebsiella pneumonia were studied. The repetitive element polymerase chain reaction analysis technique was used to assess the changes in the bacterial genetic material due to the processing of the nanomaterials. The results showed the presence of a strong chemical interaction between alginate and chitosan, and CPT was loaded successfully in both Ca-Alg2/CPT and Ca-Alg2-CH/CPT nanomaterials. Furthermore, the antimicrobial test showed that the Ca-Alg2/CPT nanocomposite was susceptible to S. aureus, E. coli, and K. pneumonia; on the other hand, Ca-Alg2-CH/CPT nanocomposite was more susceptible to E. coli and K. pneumonia and was resistant to S. aureus. The results showed that the Ca-Alg2/CPT nanocomposite was less efficient than Ca-Alg2-CH/CPT nanocomposite in killing Gram-negative treated bacteria. Moreover, results revealed that the PCR analysis revealed a polymorphic banding pattern. This observation provides an excellent guide to the ability of some polymers to induce point mutations in DNA.

scholarly journals BACTERIAL CELLULOSE FROM RICE WASTE WATER AND ITS COMPOSITE WHICH ARE DEPOSITED NANOPARTICLE AS AN ANTIMICROBIAL MATERIAL

2016 ◽  
Vol 12 (1) ◽  
pp. 70 ◽  
Author(s):  
Eli Rohaeti ◽  
Endang W Laksono ◽  
Anna Rakhmawati
Keyword(s):  
Waste Water ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Bacterial Cellulose ◽  
Nitrate Solution ◽  
Diffusion Method ◽  
E Coli ◽  
Vis Spectroscopy ◽  
Chitosan Composite

<pre><span lang="EN-GB">Bacterial cellulose (C) and its composites were synthesized from rice waste water<strong> </strong>with addition of glycerol (G) and chitosan (Ch).</span><strong></strong><span lang="EN-GB">Antibacterial activity of the C, the bacterial cellulose-chitosan composite (CCh), and the bacterial  cellulose – glycerol - chitosan composite (CGCh) which were deposited silver nanoparticles against <em>S. aureus</em>, <em>E.</em> <em>coli</em>,  and yeast <em>C. albicans</em> has been conducted. Silver nanoparticles was prepared by chemical reduction of a silver nitrate solution, a trisodium citrate as a reductor, and a PVA as a stabilizer. The UV-Vis spectroscopy is used to determine the formation of silver nanoparticles. The characterization was conducted on the bacterial celluloses and those composites including the functional groups by the FTIR, the mechanical properties by Tensile Tester, photos surfaces by SEM, and the test of the antibacterial activity against <em>S</em>. <em>aureus</em>, <em>E. coli</em>, and <em>C. albicans</em> by diffusion method. The silver nanoparticle characterization indicates that the silver nanoparticles are formed at a wavelength of 418.80 nm. The antibacterial test showed an inhibitory effect of the C, the CCh, and the CGCh which are deposited  the silver nanoparticles against of <em>S. aureus</em>, <em>E. coli</em>,  and C.albicans. The CGChs which are deposited silver nanoparticles has the highest antimicrobial activity against the <em>Staphylococcus aureus</em> ATCC 25923. The CGs which are deposited silver nanoparticles provide the highest antimicrobial activity against the <em>E. coli</em> ATCC 25922 and the yeast <em>Candida albicans</em> ATCC 10231.</span></pre>

scholarly journals Pure and SrBa Dual Doped ZnO Nanoparticles Prepared by Co-precipitation Method and Their Structural, Optical and Antimicrobial Properties

2019 ◽  
Vol 11 (06) ◽  
Author(s):  
M Karthikeyan ◽  
A Jafar Ahamed ◽  
P Vijaya Kumar
Keyword(s):  
Antimicrobial Properties ◽  
Morphological Properties ◽  
Precipitation Method ◽  
Bacterial Strains ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Doped Zno ◽  
Xrd Studies ◽  
Co Precipitation

The present investigation, the successful preparation of pure ZnO (Z1) NPs and SrBa dual doped ZnO (Z2) NPs by chemical co-precipitation technique without use of any capping agent. The structural and morphological properties of Z1 and Z2 NPs were analyzed using X-ray diffraction (XRD) studies, Field emission scanning electron microscopy (FESEM), Elemental analysis (EDAX), Fourier transform infrared spectroscopy (FTIR). An optical property was studied by UV–Vis spectroscopy and Photoluminescence (PL) spectra. The antimicrobial activity of Z1 and Z2 NPs has been investigated against Staphylococcus aureus and Klebsiella pneumoniae bacterial strains. It has been interestingly observed that Z2 NPs has enhanced the inhibitory activity than that of Z1 NPs against S. aureus and more efficiently than the K. pneumoniae bacterial strain.

scholarly journals BACTERIAL CELLULOSE FROM RICE WASTE WATER AND ITS COMPOSITE WHICH ARE DEPOSITED NANOPARTICLE AS AN ANTIMICROBIAL MATERIAL

2016 ◽  
Vol 12 (1) ◽  
pp. 70 ◽  
Author(s):  
Eli Rohaeti ◽  
Endang W Laksono ◽  
Anna Rakhmawati
Keyword(s):  
Waste Water ◽  
Antimicrobial Activity ◽  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Bacterial Cellulose ◽  
Nitrate Solution ◽  
Diffusion Method ◽  
E Coli ◽  
Vis Spectroscopy ◽  
Chitosan Composite

<pre><span lang="EN-GB">Bacterial cellulose (C) and its composites were synthesized from rice waste water<strong> </strong>with addition of glycerol (G) and chitosan (Ch).</span><strong></strong><span lang="EN-GB">Antibacterial activity of the C, the bacterial cellulose-chitosan composite (CCh), and the bacterial  cellulose – glycerol - chitosan composite (CGCh) which were deposited silver nanoparticles against <em>S. aureus</em>, <em>E.</em> <em>coli</em>,  and yeast <em>C. albicans</em> has been conducted. Silver nanoparticles was prepared by chemical reduction of a silver nitrate solution, a trisodium citrate as a reductor, and a PVA as a stabilizer. The UV-Vis spectroscopy is used to determine the formation of silver nanoparticles. The characterization was conducted on the bacterial celluloses and those composites including the functional groups by the FTIR, the mechanical properties by Tensile Tester, photos surfaces by SEM, and the test of the antibacterial activity against <em>S</em>. <em>aureus</em>, <em>E. coli</em>, and <em>C. albicans</em> by diffusion method. The silver nanoparticle characterization indicates that the silver nanoparticles are formed at a wavelength of 418.80 nm. The antibacterial test showed an inhibitory effect of the C, the CCh, and the CGCh which are deposited  the silver nanoparticles against of <em>S. aureus</em>, <em>E. coli</em>,  and C.albicans. The CGChs which are deposited silver nanoparticles has the highest antimicrobial activity against the <em>Staphylococcus aureus</em> ATCC 25923. The CGs which are deposited silver nanoparticles provide the highest antimicrobial activity against the <em>E. coli</em> ATCC 25922 and the yeast <em>Candida albicans</em> ATCC 10231.</span></pre>

Effect of Ag/ZnO-Graphitic Carbon Nitride on Antimicrobial Activity under Visible Light

2020 ◽  
Vol 858 ◽  
pp. 116-121
Author(s):  
Sirirat Rodmuang ◽  
Raweewan Plairaharn ◽  
Kanokwan Teingtum ◽  
Suntree Sangjan ◽  
Orawan Chunhachart
Keyword(s):  
Antimicrobial Activity ◽  
Zinc Oxide ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Carbon Nitride ◽  
Dye Degradation ◽  
Reduction Rate ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Precipitation Method

Zinc oxide-graphitic carbon nitride (ZnO/g-C3N4) composites were synthesized by precipitation method in order to improve photocatalytic activity under visible light. To enhance antimicrobial activity, silver was added into zinc oxide-graphitic carbon nitride (Ag/ZnO/g-C3N4). Ultrastructures of the composite were analyzed by X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Photocatalytic activity of the composites was carried out by degradation of methylene blue solution as a function of contact time. The results revealed that ZnO/g-C3N4 was capable of dye degradation at 96.65%. Addition of Ag into ZnO/g-C3N4 resulted in increase of dye reduction rate. For antibacterial test, Ag/ZnO/g-C3N4 exhibited bactericidal activity against Pseudomonas aeruginosa and Bacillus cereus. For antifungal test, Ag/ZnO/g-C3N4 showed resistance to Aspergillusniger for 7 days. Ag/ZnO-g-C3N4 composite exhibited better photocatalytic and antimicrobial activities compare to ZnO and g-C3N4. These results indicate that precipitation method is a cheap, rapid and efficient method that can be used to synthesize Ag/ZnO-g-C3N4 composites. For further studies, applications of this Ag/ZnO-g-C3N4 composites in microbiological and agricultural fields will be carried out.

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