Browsing by Author "Ranjith Kumar E"

Now showing 1 - 18 of 18

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, Abdelback; 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.
EFFECT OF BIOPOLYMER BLEND MATRIX ON STRUCTURAL, OPTICAL AND BIOLOGICAL PROPERTIES OF CHITOSAN–AGAR BLEND ZNO NANOCOMPOSITES
(Springer, 2018-07-01) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
The present research is focused on the development of ecofriendly biopolymer blend based nanocomposites to enhance the effect of cytotoxic activity. Novel eco-friendly synthesis of pure Chitosan–Agar blend and Chitosan–Agar/ZnO nanocomposites was successfully synthesized by in-situ chemical synthesis method. The influence of Chitosan–Agar (1:1 wt/wt %) concentrations (0.1, 0.5, 1 and 3 g) was studied. The presence of ZnO nanoparticles in Chitosan–Agar polymer matrix was confirmed by UV, FTIR, XRD, FESEM, EDAX and TEM. The crystallite size of the nanocomposites in the range of 12–17 nm is observed from XRD analysis. PL and UV reveal that Nanocomposites shows an blue shift by increase in the blend concentrations. TEM analysis shows that 0.1 and 3 g of Chitosan–Agar/ZnO Nanocomposites are in spindle and spherical shape with polycrystalline nature. The prepared Nanocomposites shows the respectable Antibacterial activity against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Pseudomonas aureginosa and Klebsilla pneumonia) bacteria. The potential toxicity of Chitosan–Agar/ZnO nanocomposites was studied for normal (L929) and breast cancer cell line (MB231). The result of this investigation shows that the Chitosan–Agar/ZnO nanocomposites deliver a dose dependent toxicity in normal and cancer cell line.
EFFECT OF BIOPOLYMER BLEND MATRIX ON STRUCTURAL, OPTICAL AND BIOLOGICAL PROPERTIES OF CHITOSAN–AGAR BLEND ZNO NANOCOMPOSITES
(Springer US, 2018-01-07) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
The present research is focused on the development of ecofriendly biopolymer blend based nanocomposites to enhance the effect of cytotoxic activity. Novel eco-friendly synthesis of pure Chitosan–Agar blend and Chitosan–Agar/ZnO nanocomposites was successfully synthesized by in-situ chemical synthesis method. The influence of Chitosan–Agar (1:1 wt/wt%) concentrations (0.1, 0.5, 1 and 3 g) was studied. The presence of ZnO nanoparticles in Chitosan–Agar polymer matrix was confirmed by UV, FTIR, XRD, FESEM, EDAX and TEM. The crystallite size of the nanocomposites in the range of 12–17 nm is observed from XRD analysis. PL and UV reveal that Nanocomposites shows an blue shift by increase in the blend concentrations. TEM analysis shows that 0.1 and 3 g of Chitosan–Agar/ZnO Nanocomposites are in spindle and spherical shape with polycrystalline nature. The prepared Nanocomposites shows the respectable Antibacterial activity against Gram-positive (Staphylococcus aureus and Bacillus subtilis) and Gram-negative (Pseudomonas aureginosa and Klebsilla pneumonia) bacteria. The potential toxicity of Chitosan–Agar/ZnO nanocomposites was studied for normal (L929) and breast cancer cell line (MB231). The result of this investigation shows that the Chitosan–Agar/ZnO nanocomposites deliver a dose dependent toxicity in normal and cancer cell line.
EVALUATION OF MICROSTRUCTURAL, OPTICAL, VIBRATIONAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF CDO NANOSTRUCTURE
(Elsevier, 2022-11-15) Prakash T; Priyanka R; Siranjeevi R; Ranjith Kumar E; Arunadevi N; Salman S Alharthi
Microwave irradiation was used to prepare the CdO nanostructure for photocatalytic activity. The X-ray diffraction profile after 600 °C annealing confirms the phase transition from monoclinic Cd(OH2) to CdO cubic structure. The typical crystallite sizes of the prepared and annealed nanoparticles are 34 nm–52 nm. The presence of functional groups in the samples is supported by vibrational studies. The optical band gap of as-prepared and annealed samples was calculated using UV spectra. It was discovered to be 3.06 eV for the as-prepared sample and 2.17 eV for the annealed sample. Photoluminescence measurement was selected to study the optical performance of CdO nanoparticles. They confirm the green emission at 522 nm. The morphological and elemental analyses of the CdO nanostructure were recorded using scanning electron microscopy and transmission electron microscopy. The spherical-shaped CdO nanostructures with a uniform size distribution are clearly visible in scanning electron micrographs. TEM micrographs confirm the size of the spherical shaped particles is 50 nm. Using the energy dispersive spectrum, the expected percentages of elements Cd and O were determined. The photocatalytic activity of CdO nanoparticles was tested using methylene blue and rhodamine B.
EVALUATION OF MICROSTRUCTURAL, OPTICAL, VIBRATIONAL PROPERTIES AND PHOTOCATALYTIC ACTIVITY OF CDO NANOSTRUCTURE
(Elsevier, 2022-11-15) Prakash T; Priyanka R; Siranjeevi R; Ranjith Kumar E; Arunadevi N; Salman S, Alharthi
Microwave irradiation was used to prepare the CdO nanostructure for photocatalytic activity. The X-ray diffraction profile after 600 °C annealing confirms the phase transition from monoclinic Cd(OH2) to CdO cubic structure. The typical crystallite sizes of the prepared and annealed nanoparticles are 34 nm–52 nm. The presence of functional groups in the samples is supported by vibrational studies. The optical band gap of as-prepared and annealed samples was calculated using UV spectra. It was discovered to be 3.06 eV for the as-prepared sample and 2.17 eV for the annealed sample. Photoluminescence measurement was selected to study the optical performance of CdO nanoparticles. They confirm the green emission at 522 nm. The morphological and elemental analyses of the CdO nanostructure were recorded using scanning electron microscopy and transmission electron microscopy. The spherical-shaped CdO nanostructures with a uniform size distribution are clearly visible in scanning electron micrographs. TEM micrographs confirm the size of the spherical shaped particles is 50 nm. Using the energy dispersive spectrum, the expected percentages of elements Cd and O were determined. The photocatalytic activity of CdO nanoparticles was tested using methylene blue and rhodamine B.
FACILE SYNTHESIS, CHARACTERIZATION AND APPLICATION OF MNC’S (MAGNETIC NANOCOMPOSITE) IN SEQUESTRATION OF TEXTILE DYE
(Indian Journal of Environmental Protection, 2018) Muthulakshmi Andal N; Thangamani KS; Ranjith Kumar E; Suba V
Prosopis juliflora bark activated carbon -cobalt ferrite magnetic composite (PJBAC-CFC) was synthesized 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 magnetization 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
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; Ch, Srinivas; 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 LEMON EXTRACT ASSISTED GREEN SYNTHESIS OF SPINEL CO3O4 NANOPARTICLES FOR LPG GAS SENSOR APPLICATION
(2023-02-15) Vandamar Poonguzhali R; Ranjith Kumar E; Ch., Srinivas; 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
(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, MORPHOLOGICAL, OPTICAL AND BIOLOGICAL PROPERTIES OF PURE ZNO AND AGAR/ZINC OXIDE NANOCOMPOSITES
(Elsevier, 2018-10-01) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
In this work, ZnO nanoparticles were prepared by in situ chemical precipitation method in the presence of Agar biopolymer. The influences of Agar concentrations on the structural, morphological and optical properties of ZnO have been investigated. The XRD pattern of Pure ZnO and Agar/ZnO nanocomposites indicates the hexagonal wurtzite phase of ZnO. The crystallite size of pure ZnO and Agar/ZnO nanocomposites was found to be in the range of 35.5 to 19.73 nm. Pure ZnO and Agar/ZnO nanocomposites showed nanospheroid and nanopaddy shaped morphology from FESEM studies. The interplanar distance observed from the HRTEM image confirms the plane of the prepared material. The elemental compositions of the samples were characterized by EDX. The optical properties of Pure ZnO and Agar/ZnO nanocomposites were characterized by UV, FTIR and PL. The band gap of Agar/ZnO nanocomposites were varied with the Agar concentration. Oxygen vacancy induced photoluminescence of ZnO are observed and its intensity is found to be increased linearly with the Agar concentration. The antibacterial activity of ZnO and Agar/ZnO nanocomposites was evaluated by disc diffusion method against Gram-positive (B.subtilis) and Gram-negative (P. aeruginosa) bacteria. The cytotoxicity of Agar/ZnO nanocomposites was studied against Normal (L929) and Breast cancer cell line (MB231). The result of this investigation reveals that the Agar/ZnO nanocomposites deliver a dose dependent toxicity in normal and cancer cell line.
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.
TUNING EFFECT OF POLYSACCHARIDE CHITOSAN ON STRUCTURAL, MORPHOLOGICAL, OPTICAL AND PHOTOLUMINESCENCE PROPERTIES OF ZNO NANOPARTICLES
(Elsevier, 2018-01-05) Magesh G; Bhoopathi G; Nithya N; Arun A P; Ranjith Kumar E
Chitosan/ZnO nanocomposites was synthesized by in-situ chemical precipitation method. The effect of polysaccharide Chitosan concentration (0.1 g, 0.5 g, 1 g and 3 g) was investigated by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) with Energy dispersive spectroscopy (EDX), High Resolution Transmission Electron Microscopy (HRTEM), UV–visible (UV), Fourier Transform Infrared (FTIR) and Photoluminescence Spectroscopy (PL). XRD pattern confirms the hexagonal wurtzite structure of the Chitosan/ZnO nanocomposites. The structural morphology and the elemental composition of the samples were analysed by FESEM and EDX respectively. From TEM analysis, it is observed that the particles in spindle shape morphology with average particle size ranges 10–20 nm. UV–Vis analysis reveals that the Chitosan concentrations affect the absorption band edge and shift towards lower wavelength. The oxygen vacancy induced photoluminescence of ZnO nanoparticles was observed and its intensity decreases by tuning the Chitosan concentration.
UTILIZATION OF MAGNETIC NANO COBALT FERRITE DOPED CAPRA AEGAGRUSHIRCUS DUNG ACTIVATED CARBON COMPOSITE FOR THE ADSORPTION OF ANIONIC DYES
(Journal of Environmental Chemical Engineering, 2017) 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., DirectBrown2(DB2) andReactiveRed152(RR152) from aqueous solutions. GoatDung Activated Carbon-Cobalt Ferrite Magnetic Composite (GDACCFMC) is synthesized by auto-combustion method. The surface characteristics of the prepared adsorbents are analyzed 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.