Center for Research and Post Graduate studies in Chemistry

Sivakasi, India

Center for Research and Post Graduate studies in Chemistry

Sivakasi, India

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Kannan N.,Center for Research and Post graduate Studies in Chemistry | Veemaraj T.,Ayya Nadar Janaki Ammal College Autonomous
Electronic Journal of Environmental, Agricultural and Food Chemistry | Year: 2010

Batch adsorption dynamics and equilibrium studies for the removal of cadmium (II) ions from aqueous solution using indigenously prepared Eucalyptus globules bark carbon (EGBC), Bambusa glaucescens dust carbon (BGDC) and commercial activated carbon (CAC) have been carried out under various experimental conditions at 30 +1°C. Percentage removal of cadmium (II) ions increased with the decrease in initial concentration and increased with increase in contact time and dose of adsorbent. Amount of cadmium (II) ions adsorbed increases with the decrease in particle size of EGBC. Adsorption is highly pH sensitive. Adsorption data were modeled with isotherms and the first order kinetic equations. Kinetics of adsorption is observed to be first order with intraparticle diffusion as one of the rate determining steps. Removal of cadmium (II) ions by indigenously prepared activated carbons (IPACs) is found to be favourable and hence IPACs could be employed as an alternative adsorbent to commercial activated carbon (CAC) for effluent treatment, especially for the removal of cadmium (II) ions.


Subramanian T.,Madurai Kamaraj University | Kumarraja M.,Center for Research and Post Graduate Studies in Chemistry | Pitchumani K.,Madurai Kamaraj University
Journal of Molecular Catalysis A: Chemical | Year: 2012

Mesoporous Al-MCM-41 catalyzes the chemoselective Michael addition reaction between indoles and α,β-unsaturated ketones to afford β-indolylketones at room temperature with excellent yields. The higher catalytic activity is attributed to Lewis acidic Al and the large surface area. The catalyst is readily recovered and reused more than six times without loss in its catalytic activity. The substitution at the indole nucleus occurs exclusively at the 3-position and N-alkylation products are not observed. © 2012 Elsevier B.V.


Muthirulan P.,Center for Research and Post Graduate Studies in Chemistry | Devi C.N.,Center for Research and Post Graduate Studies in Chemistry | Sundaram M.M.,Center for Research and Post Graduate Studies in Chemistry
Ceramics International | Year: 2014

We have reported a simple strategy for the fabrication of titanium dioxide (TiO2)-graphene (GR) (TiO2-GR) nanocomposites towards improvement in the photocatalytic ability under both UV and solar light irradiations. The structural properties of the nanocomposite has been characterized by a series of techniques, including Fourier Transform Infrared (FTIR) spectroscopy, Raman Spectroscopy, X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM), Transmission Scanning Electron Microscopy (TEM), UV-vis Diffuse Reflectance Spectra (UV-DRS), Cyclic Voltammetry (CV), Electrochemical Impedance Spectroscopy (EIS) and Photoluminescence spectra (PL). The photocatalytic activity of the TiO 2-GR nanocomposite catalyst was assessed by examining the degradation of acid orange 7 (AO7) dye from model aqueous solutions as a probe reaction under UV and solar light irradiations. Photodegradation experimental results indicated that the TiO2-GR nanocomposite catalyst exhibited higher photocatalytic activity than that of TiO2. The enhanced photodegradation activity might be mainly attributed to the role of GR played as electron acceptor and transporter in the composite film, which effectively suppressed the charge recombination and promoted the charge transfer within the composite. Moreover, organic compounds as intermediates of the degradation process were identified by ESI/MS. A possible reaction pathway for the degradation of AO7 was suggested by the evidence presented in this study. © 2013 Elsevier Ltd and Techna Group S.r.l.


Muthirulan P.,Center for Research and Post Graduate Studies in Chemistry | Nirmala Devi C.K.,Center for Research and Post Graduate Studies in Chemistry | Meenakshi Sundaram M.,Center for Research and Post Graduate Studies in Chemistry
Advanced Materials Letters | Year: 2014

Simple and proficient methodology has been proposed for the preparation of hybrid photocatalyst based on titanium dioxide (TiO2)-graphene (GR) nanocomposite for acid orange 7 (AO7) dye degradation under UV irradiation. High Resolution Transmission Electron Microscopy (HRTEM) and Scanning Electron Microscopy (SEM) studies revealed that TiO2 nanoparticles were uniformly dispersed on GR surface. TiO2-GR hybrid nanocomposite has also been characterized by Ultraviolet Diffusive Reflectance Spectroscopy (UV-DRS), Raman spectroscopy and X-ray diffraction (XRD) studies. Electrochemical Impedance spectroscopy (EIS) measurement revealed that the incorporation of GR with TiO2 nanoparticles significantly enhanced the electrical conductivity.The peak intensity of PL spectra of GR containing catalysts are lower than that of pristine TiO2, indicating that the electron-hole recombination rate of self-trapped excitations in TiO2 is reduced by the introduction of GR. The photocatalytic degradation measurements demonstrated that the TiO2-GR composites exhibited an enhanced photocatalytic activity for AO7 degradationunder UV irradiation compared to pure TiO2. This may due to greater adsorptivity ofdyes, extended light absorption and increased charge separation efficiency due to excellent electricalproperties of graphene and the large surface contact between graphene and TiO2 nanoparticles. Therefore, the TiO2-GR composites can be widely used as a ternary composite photocatalyst for treating the organic contaminant in the field of environmental protection. © 2014 VBRI press.


Senthilkumar S.,Center for Research and Post graduate Studies in Chemistry | Kumarraja M.,Center for Research and Post graduate Studies in Chemistry
Tetrahedron Letters | Year: 2014

A highly ordered nanoporous aluminosilicate (MMZY) is prepared and employed as a catalyst for the synthesis of benzimidazoles from 1,2-diaminobenzene and aromatic aldehydes. In all the cases, the reactions are highly chemoselective and afford 1,2-disubstituted benzimidazoles in excellent yield. The catalyst was characterized by electron microscopy and X-ray methods and its other advantages like functional tolerance, mildness of the reaction conditions, easy separation, and reusability are also highlighted. © 2014 Elsevier Ltd. All rights reserved.


Ravichandran R.,Center for Research and Post Graduate Studies in Chemistry | Rajendran M.,Center for Research and Post Graduate Studies in Chemistry | Devapiriam D.,Center for Research and Post Graduate Studies in Chemistry
Food Chemistry | Year: 2014

Quercetin found chelate cadmium ions, scavenge free radicals produced by cadmium. Hence new complex, quercetin with cadmium was synthesised, and the synthesised complex structures were determined by UV-vis spectrophotometry, infrared spectroscopy, thermogravimetry and differential thermal analysis techniques (UV-vis, IR, TGA and DTA). The equilibrium stability constants of quercetin-cadmium complex were determined by Job's method. The determined stability constant value of quercetin-cadminum complex at pH 4.4 is 2.27 × 106 and at pH 7.4 is 7.80 × 106. It was found that the quercetin and cadmium ion form 1:1 complex in both pH 4.4 and pH 7.4. The structure of the compounds was elucidated on the basis of obtained results. Furthermore, the antioxidant activity of the free quercetin and quercetin-cadmium complexes were determined by DPPH and ABTS assays.© 2013 Elsevier Ltd. All rights reserved.


Rajendran M.,Center for Research and Post Graduate Studies in Chemistry
Photodiagnosis and Photodynamic Therapy | Year: 2015

Photodynamic therapy (PDT) is based on the dye-sensitized photooxidation of biological matter in the target tissue, and utilizes light activated drugs for the treatment of a wide variety of malignancies. Quinones and porphyrins moiety are available naturally and involved in the biological process. Quinone metabolites perform a variety of key functions in plants which includes pathogen protection, oxidative phosphorylation, and redox signaling. Quinones and porphyrin are biologically accessible and will not create any allergic effects. In the field of photodynamic therapy, porphyrin derivatives are widely used, because it absorb in the photodynamic therapy window region (600-900. nm). Hence, researchers synthesize drugs based on porphyrin structure. Benzoquinone and its simple polycyclic derivatives such as naphthaquinone and anthraquinones absorb at lower wavelength region (300-400. nm), which is lower than porphyrin. Hence they are not involved in PDT studies. However, higher polycyclic quinones absorb in the photodynamic therapy window region (600-900. nm), because of its conjugation and can be used as PDT agents. Redox cycling has been proposed as a possible mechanism of action for many quinone species. Quinones are involved in the photodynamic as well as enzymatic generation of reactive oxygen species (ROS). Generations of ROS may be measured by optical, phosphorescence and EPR methods. The photodynamically generated ROS are also involved in many biological events. The photo-induced DNA cleavage by quinones correlates with the ROS generating efficiencies of the quinones. In this review basic reactions involving photodynamic generation of ROS by quinones and their biological applications were discussed. © 2015 Elsevier B.V.


Kannan N.,Center for Research and Post graduate Studies in Chemistry | Veemaraj T.,Center for Research and Post graduate Studies in Chemistry
Electronic Journal of Environmental, Agricultural and Food Chemistry | Year: 2010

Studies on batch adsorption dynamics and equilibrium for the removal of cadmium (II) ions from aqueous solution using indigenously prepared jack fruit seed (JFSC) and commercial activated carbons (CAC) have been carried out with an aim to obtain data for treating effluents from metal processing and metal finishing industries. Effect of various process parameters has been investigated by following the batch adsorption technique at 30 +1°C. Percentage removal of cadmium (II) ions increased with the decrease in initial concentration and increased with increase in contact time and dose of adsorbent. Amount of cadmium (II) ions adsorbed increases with the decrease in particle size of JFSC. As initial pH of the slurry increased, the percentage removal increased, reached a maximum and the final solution pH after adsorption decreases. Adsorption data were modeled with the Freundlich and Langmuir isotherms, the first order kinetic equations proposed by Natarajan - Khalaf, Lagergren and Bhattacharya and Venkobachar and intra- particle diffusion model and the models were found to be applicable. Kinetics of adsorption is observed to be first order with intraparticle diffusion as one of the rate determining steps. Removal of cadmium (II) ions by jack fruit seed carbon (JFSC) is found to be favourable and hence JFSC could be employed as an alternative adsorbent to commercial activated carbon (CAC) for effluent treatment, especially for the removal of cadmium (II) ions.


Muthirulan P.,Center for Research and Post Graduate Studies in Chemistry | Nirmala Devi C.K.,Center for Research and Post Graduate Studies in Chemistry | Sundaram M.M.,Center for Research and Post Graduate Studies in Chemistry
Journal of Environmental Chemical Engineering | Year: 2013

The present work describes a novel contribution to the development of a new photocatalyst based on titanium dioxide (TiO2)@poly(o- phenylenediamine) (PoPD) core-shell nanocomposites for the mineralization of Rhodamine B (RB) dye under sun light irradiation. The core-shell feature of the nanocomposites was proved by Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM). Ultraviolet-visible Diffuse Reflectance Spectra (UV-vis DRS) revealed that TiO2@PoPD core-shell composites show broad and stronger absorption than TiO2 in the whole range of visible light indicating the sensitizing effect of PoPD. Structure of the TiO 2@PoPD nanocomposite was confirmed by Fourier Transform Infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) pattern. The hybrid photocatalysts possess dramatic photocatalytic activity for the degradation of the RB under solar light irradiation. A plausible pathway and mechanism for the photocatalytic degradation of RB was also discussed. © 2013 Elsevier Ltd All rights reserved.


Senthilkumar S.,Center for Research and Post graduate Studies in Chemistry | Kumarraja M.,Center for Research and Post graduate Studies in Chemistry
Catalysis Communications | Year: 2015

Regioselective N-allylation and N-cinnamylation of indoles are achieved using a novel catalyst of CuI-exchanged hierarchically architectured nanoporous material (MMZCuIY). The catalyst was characterized by electron microscopy and X-ray methods. Other advantages like functional tolerance, easy separation and reusability of the catalyst are also highlighted. © 2015 Elsevier B.V. All rights reserved.

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