Browsing by Author "Ranjith Kumar, E"

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CAMELLIA SINENSIS ASSISTED GREEN SYNTHESIS OF METAL OXIDE NANOPARTICLES: INVESTIGATION OF STRUCTURAL, VIBRATIONAL, MORPHOLOGICAL AND THERMAL ANALYSIS
(2024-06) Sathyapriya, R; Nilofur Fathima, S J; Arun Paul, C; Prakash, T; Ranjith Kumar, E; Arunadevi, Natarajan
Metal oxide nanoparticles were created via a green combustion approach, with natural tea extract and metal nitrates as the key starting components. The X-ray diffraction (XRD) spectra were used to determine the phase of CuO, NiO, and Co3O4 nanoparticles. The findings validate the monoclinic and cubic structures of CuO, NiO, and Co3O4 nanoparticles. The X-ray diffraction (XRD) profiles of CuO, NiO, and Co3O4 nanoparticles show crystallite sizes of 25.2, 31.2, and 32.5 nm, respectively. Metal oxide nanoparticles exhibit approximately equal average crystallite diameters, demonstrating the consistency of the synthesis procedure. The FTIR spectra were utilized to investigate the functional groups and other chemical components present in CuO, NiO, and Co3O4 nanoparticles. FESEM investigation revealed a leaf-like surface morphology in CuO nanoparticles. The EDX spectra confirm the presence of metals and oxygen in the produced metal oxide nanoparticles. The study focused on the thermal stability and weight loss % of metal oxide nanoparticles. Metal oxide nanoparticles synthesized from natural tea have been shown to have good thermal stability.
CITRUS LIMON ASSISTED GREEN SYNTHESIS OF MGO NANOPARTICLES: EVALUATION OF PHASE, FUNCTIONAL GROUPS, SURFACE MORPHOLOGY, THERMAL STABILITY AND COLLOIDAL STABILITY
(Elsevier, 2022-10-01) Vandamar Poonguzhali, R; Srimathi, M; Ranjith Kumar, E; Arunadevi, N; Hosam O., Elansary; Ashraf A.A, Abdelbacki; Shaimaa A.M, Abdelmohsen
Citrus limon (the common lemon juice) assisted green combustion was used to create MgO nanostructures. The powder was heat treated for 3 h at 350 °C, and the as-synthesized and heat treated MgO nanostructures were tested by various techniques to investigate their phase composition, structure, thermal stability, colloidal stability, surface morphology, and antimicrobial activities. XRD was performed to study the single-phase cubic structure of MgO nanostructures, and the XRD results confirmed that the sizes of the MgO nanostructures are in the nanoscale range. The average crystallite sizes for as-synthesized and heat-treated samples are 7.8 nm and 19.2 nm, respectively. The functional groups in the experiment were examined using FTIR in the 400–4000 nm range. Thermal analysis of the MgO nanostructures were recorded through TG-DTA and the results confirm the MgO NPs thermally decomposed at 359.77 °C and 361.86 °C. The colloidal stability of the samples was tested using Zeta potential, it confirms that both samples are stable. The external morphology of as-synthesized and heat-treated samples were visualized through SEM. It confirms that the as-synthesized and heat treated MgO samples are nanostructures. The elemental analysis confirms the presence of Mg and O in both samples. The antimicrobial activity of MgO nanostructures tested by plate count mothed and the heat-treated sample exhibits noticeable antimicrobial performance against G-positive and G-negative bacteria.
EFFECTS OF ND DOPING ON STRUCTURAL, OPTICAL, MORPHOLOGICAL AND SURFACE-CHEMICAL STATE ANALYSIS OF ZNO NANOPARTICLES FOR ANTIMICROBIAL AND ANTICANCER ACTIVITIES
(Elsevier, 2021-04) Indumathi, T; Theivarasu, C; Pradeep, I; Thillai Rani, M; Magesh, G; Sharmila Rahale, C; Ranjith Kumar, E
Zinc oxide NPs and various concentrations of Nd-ZnO NPs were prepared using a chemical precipitation process. Synthesized nanoparticles have been characterised by X-Ray Diffraction, Fourier Transform Infra-Red Spectroscopy, Scanning Electron Microscope, Transmission Electron Microscopy, Energy Dispersive X-ray Analysis, X-ray Photoelectron Spectroscopy, Micro-Raman and Photo Luminescence (PL) Spectra in order to study structural functional, morphological, elementary and compositional groups. XRD data verified the hexagonal wurtzite structure of the ZnO and Nd-ZnO NPs. Zn-O stretching frequencies ZnO and Nd-ZnO were observed at 423, 466, 423 and 452 cm-1, respectively, from the FTIR spectra. The morphological changes of ZnO and Nd-ZnO NPs have been confirmed by SEM and TEM. The EDAX spectra confirms the chemical composition of the elements involved. XPS confirms the oxidation status of the elements concerned. The peak at 432 cm-1 of the Raman spectra is the E2 phonon mode of the metal oxide NPs involved. The improved photoluminescent properties of Nd-ZnO compared to ZnO NPs are shown by the Photoluminescent (PL) spectra. The antibacterial activity of the synthesised nanoparticles against gram-positive and gram-negative bacteria indicates that the highest concentration of Nd-ZnO (Zn1-xNdxO when x=0.15) shows higher antibacterial activity. The anticancer activity of the synthesised nanoparticles has shown that the low concentration of Nd-ZnO (at Nd concentration is 0.05) is adequate for the 50 percent of cell mortality.
EVALUATION OF GAS SENSOR BEHAVIOUR OF SM3+ DOPED TIO2 NANOPARTICLES
(Springer Link, 2021-05-29) Nithya, N; Ranjith Kumar, E; Magesh, G; Arun, A P; Khlood S, Abou-Melha; Gamila, Badr; Nashwa M, El-Metwaly; Gaber A M, Mersal; Sharmila Rahale, C
The Sol–Gel approach is used to synthesize samarium-doped TiO2 nanoparticles (Sm- TiO2 NPs). Research on the structural, morphological and optical properties of TiO2 nanoparticles by XRD, FESEM, TEM, UV, FTIR, and PL was used. The Sm-TiO2 NPs are verified by the XRD profile of anatase, brookite and rutile phase structures. Crystallite size decreases when Sm doped with TiO2 nanoparticles. The external morphologies of the TiO2 nanoparticles in spherically shaped Sm are captured by FESEM. The sample size distribution and polycrystalline composition of the particles have been analyzed using TEM. The EDX spectrum verifies the presence of Ti, O and Sm elements of all the samples. The values have been found to be very close to what has been expected. Sm substitution greatly affected the optical bandgap of TiO2 nanoparticles. It shows that the band gap decreases from 3.64 to 3.61 eV as the concentrations of Sm increases. FTIR confirms the presence of functional groups and Ti–O bonds present in the prepared sample. PL analysis shows the emission for violet range. Using the dip-coating process, a thin film for sensor function is developed. PVDF flat sheet membrane is used as a substrate for sensing material. For various ethanol concentrations with optimized operating temperatures of 303 K, the sensing behaviour of the sensor element is investigated. The very rapid reaction and recovery time of 10 s and 8 s shows that the prepared samples are appropriate for gas sensor applications.
EVALUATION OF STRUCTURAL, SURFACE MORPHOLOGICAL AND THERMAL PROPERTIES OF AG-DOPED ZNO NANOPARTICLES FOR ANTIMICROBIAL ACTIVITIES
(Elsevier, 2021-09) Ranjithkumar, B; Ranjith Kumar, E; Srinivas, M; Ramalingam, H B; Srinivas, Ch.; Magesh, G; Balamurugan, A; Sharmila Rahale, C; ChandarShekar, B
Novel properties of green synthesis methods have paved the way for a new area of study in the scientific community. Systematic research was carried out in the current study for Ag-doped ZnO nanostructures prepared using cow urine and honey. The phase evaluation and surface morphological features of prepared nanoparticles were examined using XRD and FE-SEM analysis. From the XRD analysis, the average crystallite size () was estimated and found to be 25.1 nm for cow urine and 29.9 nm for honey-assisted nanomaterial. FE-SEM confirms the presence of plate-like and spherical nanoparticles in the synthesized sample. Compositional analysis of Zn, Ag, and O from EDX spectra showed the reliability of present green synthesis. The thermal analysis of the nanostructures of Ag-ZnO has been investigated and the effect of these natural ingredients on thermal stability has also been analyzed. Antimicrobial activities were tested against two human pathogenic bacteria and their comparative results are presented.
FACILE SYNTHESIS, CHARACTERIZATION AND APPLICATION OF MAGNETIC NANO COMPOSITES IN SEQUESTRATION OF TEXTILE DYE
(Indian Journal of Environmental Protection, 2018-10) Thangamani, K S; Narasimman, Muthulakshmi Andal; Ranjith Kumar, E; Suba Arumugam, V
Prosopis juliflora bark activated carbon-cobalt ferrite magnetic composite (PJBAC-CFC) was syhthesised by the auto-combustion method and employed for the removal of direct brown 2 (DB2) from aqueous solutions. The prepared composite was characterized by powder XRD, SEM, EDAX, AFM, N2 adsorption-desorption isotherm and magnetisation measurement. Operating factors influencing the rate adsorption, namely initial dye concentrations, doses of sorbent materials, preset time intervals, variable pH and temperature environments are substantiated by batch equilibration method. Adsorption is observed to be more pronounced at pH 2. The magnetized composite material exhibited enhanced sorption characteristics. The isothermal adsorption data fit well with Freundlich isotherms. Kinetic studies favour the system to follow the second-order. The outcome of the present work indicates that Prosopis juliflora bark activated carbon - cobalt ferrite magnetic composite can be effectively used as a cost-effective potential adsorbent for trapping the dye molecules.
INFLUENCE OF CARBOXYLIC ACIDS ON STRUCTURAL, OPTICAL, THERMAL, AND ELECTRICAL PROPERTIES OF FERROELECTRIC GLYCINE PHOSPHITE SINGLE CRYSTALS
(Springer Link, 2022-06-28) Shanmuga Sundari, S; Arunadevi, N; Kanchana, P; Meena, P; Ranjith Kumar, E; Hosam O, Elansary; Eman A, Mahmoud; Shaimaa A. M, Abdelmohsen
Glycine phosphite (GPI), a semi-organic nonlinear optical NLO material, has been synthesized at room temperature. Slow evaporation method has been adopted to grow the single crystals of GPI and acetic acid, benzoic acid, formic acid, oxalic acid, and succinic acid-doped GPI crystals. The synthesized crystals are exposed to x-ray diffraction XRD, Fourier transform infrared (FTIR), and differential scanning calorimetry analysis DSC. The effects of doping on the structural parameters are analyzed. All the functional groups are identified by the corresponding peaks in the FTIR spectra. The UV–Vis spectrum shows that the materials have good optical transparency. The energy band gap values are found to be in the range of 5.1–5.4 eV for all the crystals. The mechanical stability of the grown crystals changes with different doping acids. The thermal studies were also affected by the addition of doping acids to the GPI crystal. Growth patterns and defect formation were studied by means of chemical etching. The dielectric constant and loss were evaluated from 300 to 410 K. It confirms that the dielectric constant value of GPI is higher than the acid-doped crystals.
INVESTIGATION ON GROWTH, STRUCTURE, AND PHYSICAL PROPERTIES OF AN ORGANIC CRYSTAL 2-AMINOPYRIDINIUM CYANOACETATE
(Elsevier, 2023-10-05) Sivapriya, S; Subramaniyan Raja, R; Arun Kumar, A; Suryakanth, J; Arunadevi, N; Ranjith Kumar, E; Balasubramanian, K
The single crystal of 2-Aminopyridinium cyanoacetate (2APC) has been grown by solution growth slow evaporation technique. Single crystal XRD shows that the grown 2APC is monoclinic crystal system with centrosymmetric space group P21/c and the lattice parameters were found to be a = 9.8955(9) Å b = 6.1096(5) Å c = 14.6132(12) Å. The functional groups and chemical composition of grown 2APC crystal was confirmed by FTIR analysis. UV–Vis spectral study showed that grown crystal has high transparency in the entire visible region and the cut off wavelength at 369 nm. Thermal properties of the crystal were investigated by TGA/DTA analysis. Microhardness mechanical studies show that the hardness number (Hv) of a 2APC single crystal increases with the load as measured by the Vickers microhardness method. The dielectric properties of the grown crystal were analyzed by varying the frequency. The LDT and Z-Scan study were carried out to explore the laser stability and the existence of NLO property in the 2APC.
LEMON JUICE (NATURAL FUEL) ASSISTED SYNTHESIS OF MGO NANORODS FOR LPG GAS SENSOR APPLICATIONS
(Elsevier, 2021-02) Vandamar Poonguzhali, R; Ranjith Kumar, E; Pushpagiri, T; Ananth, Steephen; Arunadevi, N; Baskoutas, S
Lemon juice assisted combustion method was adopted to prepare MgO nanorods. The role of heat treatment on structural, morphological and gas sensing properties of MgO NPs has been analyzed. The phase analyses of the samples were analyzed using X-ray Diffraction (XRD). The single-phase nanostructure of MgO nanoparticles has been identified from the XRD spectra. The average crystallite sizes are found to be in the range 7.8 nm–19.2 nm. The nanorod like structure of MgO has been recorded through SEM and TEM. The size of MgO nanostructure recorded from TEM is well matched with the crystallite size calculated by XRD. The lemon assisted synthesis of MgO nanoparticles show noticeable gas sensing properties for various gases. In different aspects, gas sensing response of MgO nanoparticles have been analyzed for different gases. The maximum sensing response ~70% has been recorded for LPG at the optimum temperature (OT) 300 °C with the gas concentrations 1000 ppm.
NATURAL CITRIC ACID (LEMON JUICE) ASSISTED SYNTHESIS OF ZNO NANOSTRUCTURES: EVALUATION OF PHASE COMPOSITION, MORPHOLOGY, OPTICAL AND THERMAL PROPERTIES
(Elsevier, 2021-08-15) Vandamar Poonguzhali, R; Ranjith Kumar, E; Sumithra, M G; Arunadevi, N; Sharmila Rahale, C; Alaa M, Munshi; Gaber A.M, Mersal; Nashwa M, El-Metwaly
In recent years, because of their excellent electrocatalytic action and applications in different fields, metal oxide nanostructures have received massive consideration from scientists. Zinc oxide nanostructures are useful materials for a range of sensing applications and possess admirable electrocatalytic properties and stability. The current research presents the natural citric acid assisted synthesis of ZnO nanostructures and their structural, optical, morphological and thermal properties. X-ray diffraction was studied for the phase assessment of as prepared (Z1) and annealed ZnO (Z2) nanostructures and the crystallite sizes of the Z1 and Z2 samples were also located in the range between 35 nm and 38 nm. FESEM and TEM experiments were carried out to explore the surface features of Z1 and Z2 samples. The polycrystalline existence of the samples is demonstrated by the hexagonal, cubic and spherical shaped ZnO nanostructures. The energy band gap of Z1 and Z2 samples was determined (3.16 eV for Z1 and 3.12 eV for Z2) from the UV spectrum. The impact of annealing treatment on the thermal stability of ZnO nanostructures was studied and the main peak was observed for the Z1 sample at ~249 °C and for the Z2 sample at ~289 °C.
NATURAL CITRIC ACID ASSISTED SYNTHESIS OF CUO NANOPARTICLES: EVALUATION OF STRUCTURAL, OPTICAL, MORPHOLOGICAL PROPERTIES AND COLLOIDAL STABILITY FOR GAS SENSOR APPLICATIONS
(Elsevier, 2022-09-15) Vandamar Poonguzhali, R; Ranjith Kumar, E; Arunadevi, N; Srinivas, Ch.; Mohamed E, Khalifa; Sraa, Abu-Melha; Nashwa M, El-Metwaly
In the present research, natural ingredient lemon juice was selected as a fuel to prepare nanoparticles under combustion method. The structural properties of nanophase copper oxide nanoparticles (CuO NPs) synthesized by a natural citric acid aided combustion process were studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). According to the SEM and TEM images, the manufactured product is made up of spherical nanoparticles with a limited size distribution. According to the XRD pattern, the average crystallite size of monoclinic structured CuO nanoparticles was 10.4 nm for as-prepared samples and 20.5 nm for annealed samples. The zeta potential value confirms the negative surface charge of the samples and the values show the excellent stability (-58.1 mV) for as-prepared sample and the good particles stability (-38.3 mV) was exhibited for heat treated sample. The optical band gap of CuO nanoparticles is 2.01 eV and it decreases to 1.28 eV under heat treatment. The sensitivity and selectivity of the samples were tested under different operating temperatures (OT) and different gas concentrations (GC). Recovery-response time plots confirm that the CuO nanoparticles are promising materials for gas sensor fabrications.
NATURAL FUELS (HONEY AND COW URINE) ASSISTED COMBUSTION SYNTHESIS OF ZINC OXIDE NANOPARTICLES FOR ANTIMICROBIAL ACTIVITIES
(Elsevier, 2021-05-15) Ranjithkumar, B; Ramalingam, H B; Ranjith Kumar, E; Srinivas, Ch; Magesh, G; Sharmila Rahale, C; Nashwa M, El-Metwaly; Chandar Shekar, B
A novel green synthesis of the combustion pathway was adopted for the preparation of ZnO nanoparticles using Honey and Cow urine. The effects of honey and cow urine on crystalline size, structure, morphology, band gap and thermal properties of ZnO nanoparticles have been analyzed. The polycrystalline hexagonal wurtzite structure of ZnO nanoparticles is confirmed by XRD spectra. The mean crystalline sizes of the ZnO nanoparticles were 23 nm and 29 nm respectively, for the honey and cow urine phase. The external morphology and grain size of the products have been visualized via FE-SEM and TEM. The average sizes of the grains of the ZnO nanoparticles were perfectly associated with the crystalline size measured from the XRD. Spherical and hexagonal shaped nanostructures were reported using FE-SEM and TEM micrographs. The optical absorption spectra of ZnO nanoparticles have been analyzed using UV–Vis spectrometry. In the FT-IR spectra, around 400 cm−1 to 600 cm−1 range have been allotted to the Zn–O vibration. The thermal properties of ZnO nanoparticles have been analyzed using TGA. Changes in weight loss for different ZnO nanoparticles using honey and cow urine have been documented. Gram Positive (B.Subtilis) and Gram-Negative (E.Coli)Bacteria were tested using plate counting technique to study the antimicrobial activity of ZnO nanoparticles prepared by cow's urine and honey. Compared with cow urine-prepared ZnO nanoparticles, honey-assisted ZnO nanoparticles demonstrate strong antibacterial activity.
NATURAL LEMON EXTRACT ASSISTED GREEN SYNTHESIS OF SPINEL CO3O4 NANOPARTICLES FOR LPG GAS SENSOR APPLICATION
(Elsevier, 2023-02-15) Vandamar Poonguzhali, R; Ranjith Kumar, E; Srinivas, Ch; Mubark, Alshareef; Meshari M, Aljohani; Ali A, Keshk; Nashwa M, El-Metwaly; Arunadevi, N
A fresh lemon juice-assisted auto-combustion method was implemented for the synthesis of Co3O4 nanoparticles (Co3O4 NPs). The structural, vibrational, optical, and morphological properties of prepared Co3O4 NPs were investigated at 350 °C. The effects of lemon juice and heat treatment on the physicochemical properties of Co3O4 nanoparticles were investigated. XRD was used to investigate the structure, lattice constant, and crystallite size of Co3O4 NPs. Heat treatment at 350 °C causes the crystallite size to increase from 14.4 nm to 23.7 nm. FT-IR spectroscopy was used to investigate the functional groups and vibrational modes of unheated and heated Co3O4 NPs. Unheated and heated Co3O4 NPs had energy band gaps of 3.14 eV and 3.4 eV, respectively. TEM micrographs of heat-treated Co3O4 NPs confirm the nanoscale range of the particles, which agrees well with the crystallite size determined by XRD. The colloidal stability of Co3O4 NPs has been analyzed through zeta potential values, and the obtained values confirm that the colloidal stability of Co3O4 NPs was influenced by heat treatment. LPG based sensor behavior of Co3O4 nanoparticles has been tested with various aspects of sensing parameters. The result shows that the prepared nanoparticles can be a promising sensing material for toxic gases like LPG, CO2 and NH3
NEW EPOXY-NANO METAL OXIDE-BASED COATINGS FOR ENHANCED CORROSION PROTECTION
(Elsevier, 2022-02-15) Arunadevi, N; Swathika, M; Mehala, M; Ranjith Kumar, E; Tahani M, Bawazeer; Moataz, Morad; Kholood, Alkhamis; Samar Y, Al-nami; Nashwa M, El-Metwaly
Aminoguanidium-1-naphthoate and its Ni(II) and Co(II) complexes were synthesized and characterized by spectral, thermal and structural methods. By using these compounds as precursors, epoxy coated ligand, NiO and CoO has been prepared by Sol-gel method in order to protect the corrosion on mild steel substrate. Resistance and protection against corrosion of the synthesized sample was studied in 3 M HCl, 1.5 M H2SO4, and 0.5 M H3PO4 by weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The surface and structural morphological studies of epoxy-metal oxides were investigated using powder XRD and SEM analysis. The corrosion protection efficiency of epoxy -NiO and epoxy -CoO nanoparticles film on mild steel is high than epoxy-L. The molecular docking study against 3T88 and 1Y2T protein with synthesized compound was performed to study the interactions responsible for anti-bacterial activity against S. aureus and E. coli.
STRUCTURAL AND OPTICAL PROPERTIES OF SALICYL-N-METHYL-4-STILBAZOLIUM TOSYLATE: THERMAL, DFT, MEP AND HIRSHFELD SURFACE ANALYSIS
(Elsevier, 2023-01-05) Shanmuga Sundari, S; Mehala, M; Arunadevi, N; Kanchana, P; Salman S, Alharthi; Ranjith Kumar, E; Al-Douri, Y; Abd El-Rehim, A F
The structural characteristics and optimized geometry of salicyl-N-methyl-4-stilbazolium tosylate (SMST), a derivative of the prominent electro-nonlinear optic crystal 4-(N,N-dimethylamino)-N-methyl-4-toluene sulfonate (DAST) is investigated. Its morphology, spectral, vibrational, thermal, and electronic features have been examined in studies like FT-IR, UV-Transmittance spectroscopy, single crystal XRD and TG-DTA analysis. Thermal parameters like activation energy, entropy, enthalpy, and Gibbs free energy suggest that the reaction is slower and non-spontaneous. The optical constants like energy band gap, absorption coefficient, extinction coefficient, refractive index, and skin depth of SMST have been calculated. The energy band gap value is found to be 2.69 eV, which makes SMST a potential and promising material for non-linear optical applications. The dielectric behavior of SMST is in agreement with the property needed for NLO materials. Theoretical calculations like density functional theory and frontier molecular orbitals- HOMO and LUMO are investigated to analyze the structural properties, atomic arrangement, oriented geometry, and dipole moment. Molecular electrostatic potential (MEP), Hirshfeld surface, and 2D fingerprint plot analysis are examined to provide information about the molecular interaction, crystal packing, electron density, and intermolecular properties of atomic contacts. Second Harmonic Generation of SMST shows greater efficiency than urea, which confirms that SMST crystal can leads to many applications in the optical field.
STRUCTURAL, OPTICAL, MORPHOLOGICAL AND ELECTROCHEMICAL PROPERTIES OF ZNO AND GRAPHENE OXIDE BLENDED ZNO NANOCOMPOSITES
(Elsevier, 2023-03-01) Sudha, D; Ranjith Kumar, E; Shanjitha, S; Alaa M, Munshi; Gamil A.A, Al-Hazmi; Nashwa M, El-Metwaly; Jone Kirubavathy, S
A simple cost-effective co-precipitation method was adopted to prepare ZnO nanoparticles from a metal organic framework. The synthesized ZnO nanoparticles were blended with graphene oxide (GO) to prepare the ZnO-GO nanocomposite. The physicochemical properties of ZnO nanoparticles and ZnO-GO nanocomposite were analyzed via various techniques. The structural behavior of ZnO and ZnO-GO nanocomposite was studied by XRD and FT-IR analysis. The XRD profile confirms the hexagonal structure with an average crystallite size of 19.4 nm for ZnO and 16.2 nm for ZnO-GO nanocomposites. The functional groups and the vibration modes of the samples were examined through FT-IR. It confirms the metallic presence in the ZnO and ZnO-GO samples in the wavenumber range of 400–600 cm−1. The optical properties of ZnO and ZnO-GO were studied via UV–vis spectra. The surface morphology of the samples was recorded through FESEM, and the elemental presence in the samples was examined by EDX. It confirms that the prepared samples are spherical in shape with uniform size distributions. Cyclic voltammetry has been used to study the redox behavior of electroactive ZnO and ZnO-GO composites.
STRUCTURAL, OPTICAL, THERMAL, BIOLOGICAL AND MOLECULAR DOCKING STUDIES OF GUANIDINE BASED NAPHTHOATE METAL COMPLEXES
(Elsevier, 2021-06) Arunadevi, N; Swathika, M; Prabha Devi, B; Kanchana, P; Shanmuga Sundari, S; Jone Kirubavathy, S; Subhapriya, P; Ranjith Kumar, E
The present work reports the complexation of few d-block metals with 3-hydroxy-2-naphthoic acid and guanidine which yields corresponding mononuclear complex bis(guaninium) 3-hydroxy-2-naphthoate metal (II) dihydrate of the type M(CN3H5)2{C10H6(3-O)(2-COO)}].2H2O, where M= form Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II), Pb(II) and Ca(II) of ratio 1:2:4 – metal: acid: base. Characterization of the complexes were done by elemental analysis, IR spectra, UV-Visible spectroscopy, TG-DTA, powder XRD. TG-DTA study reveals various decomposition pattern and thermal stability of the metal complexes. Crystalline nature of the metal complexes is confirmed form powder XRD measurement. SEM coupled with EDAX and AFM confirms the presence of nano-sized metal oxides. Antibacterial studies of the metal complex prove that they are active against Bacillus subtilis and Escherichia coli. Furthermore, molecular docking was carried out for a study of physicochemical properties and to show the binding energy of ligands with proteins.
UTILIZATION OF MAGNETIC NANO COBALT FERRITE DOPED CAPRA AEGAGRUS HIRCUS DUNG ACTIVATED CARBON COMPOSITE FOR THE ADSORPTION OF ANIONIC DYES
(Elsevier, 2017-06) Thangamani, K S; Muthulakshmi Andal, N; Ranjith Kumar, E; Saravanabhavan, M
A novel activated carbon prepared from profusely available bio-waste material, goat dung is employed for anionic dyes removal viz., Direct Brown 2 (DB2) and Reactive Red 152 (RR152) from aqueous solutions. Goat Dung Activated Carbon-Cobalt Ferrite Magnetic Composite (GDACCFMC) is synthesized by auto-combustion method. The surface characteristics of the prepared adsorbents are analysed by SEM, EDAX, BET and BJH and the size of the synthesized GDACCFMC is characterized by AFM. From the AFM results, the synthesized GDAC-CFMC is found to be lesser than 3 nm. The magnetic property of GDAC-CFMC is characterized by using vibrating sample magnetometer (VSM) equipment which reveals its excellent magnetic performance in dye removal. The batch equilibration experiments pertaining to the influence of operating factors viz., varying initial dye concentrations, doses of sorbent materials, preset time intervals, variable pH and temperature environments are substantiated to evaluate the sorptive nature. Adsorption is observed to be more pronounced at acidic pH. Sorption efficiency of Goat Dung Activated Carbon (GDAC) is compared with the derived GDAC-CFMC, whose experimental results indicate better performance of the magnetized material. The isothermal adsorption data fits well with Freundlich isotherms. The thermodynamic studies reveal that the adsorption process is favourable, exothermic and spontaneous. Adsorption kinetic studies favour the systems to follow the second-order. The aftermath of the present work implies that both GDAC and GDAC-CFMC can be effectively used as potential adsorbents for trapping the dye molecules.