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Kumar M, Tamilarasan R. Kinetics, equilibrium data and modeling studies for the sorption of chromium by Prosopis juliflora bark carbon. ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2013.05.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Bhuvaneswari M, Sendhilnathan S, Tamilarasan R, Sivakumar V. A study on leakage current and electrical properties of oleic acid-coated cobalt-doped Mn-Zn ferrite nanocrystalline powders. J Anal Sci Technol 2017. [DOI: 10.1186/s40543-017-0119-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Kumar M, Tamilarasan R, Arthanareeswaran G, Ismail AF. Optimization of methylene blue using Ca(2+) and Zn(2+) bio-polymer hydrogel beads: A comparative study. Ecotoxicol Environ Saf 2015; 121:164-173. [PMID: 25913699 DOI: 10.1016/j.ecoenv.2015.04.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 04/06/2015] [Accepted: 04/08/2015] [Indexed: 06/04/2023]
Abstract
Recently noted that the methylene blue cause severe central nervous system toxicity. It is essential to optimize the methylene blue from aqueous environment. In this study, a comparison of an optimization of methylene blue was investigated by using modified Ca(2+) and Zn(2+) bio-polymer hydrogel beads. A batch mode study was conducted using various parameters like time, dye concentration, bio-polymer dose, pH and process temperature. The isotherms, kinetics, diffusion and thermodynamic studies were performed for feasibility of the optimization process. Freundlich and Langmuir isotherm equations were used for the prediction of isotherm parameters and correlated with dimensionless separation factor (RL). Pseudo-first order and pseudo-second order Lagegren's kinetic equations were used for the correlation of kinetic parameters. Intraparticle diffusion model was employed for diffusion of the optimization process. The Fourier Transform Infrared Spectroscopy (FTIR) shows different absorbent peaks of Ca(2+) and Zn(2+) beads and the morphology of the bio-polymer material analyzed with Scanning Electron Microscope (SEM). The TG & DTA studies show that good thermal stability with less humidity without production of any non-degraded products.
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Affiliation(s)
- M Kumar
- Department of Chemistry, Anna University Chennai, University College of Engineering, Pattukottai, Rajamadam 614701, Tamilnadu, India
| | - R Tamilarasan
- Department of Chemistry, Anna University Chennai, University College of Engineering, Pattukottai, Rajamadam 614701, Tamilnadu, India.
| | - G Arthanareeswaran
- Membrane Research Laboratory, Department of Chemical Engineering, National Institute of Technology-Tiruchirapalli, Tiruchirapalli, 620015, India.
| | - A F Ismail
- Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia.
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Kumar M, Elangovan G, Tamilarasan R, Vijayakumar G, Mukeshkumar P, Sendhilnathan S. Biosorption of aniline blue from aqueous solution using a novel biosorbent Zizyphus oenoplia seeds: Modeling studies. Polish Journal of Chemical Technology 2015. [DOI: 10.1515/pjct-2015-0052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This article presents the feasibility for the removal of Aniline Blue dye (AB dye) from aqueous solution using a low cost biosorbent material Zizyphus oenoplia seeds. In this study, a batch mode experiments of the adsorption process were carried out as a function of pH, contact time, concentration of dye, adsorbent dosage and temperature. The experimental data were fitted with Freundlich and Langmuir isotherm equations. The feasibility of the isotherm was evaluated with dimensionless separation factor (RL). The kinetic data of sorption process are evaluated by using pseudo-first order and pseudo-second order equations. The mode of diffusion process was evaluated with intra-particle diffusion model. The thermodynamic parameters like change in enthalpy (ΔHº); change in entropy (ΔSº) and Gibbs free energy change (ΔGº) were calculated using Van’t Hoff plot. The biosorbent material was characterized with Fourier Transform Infrared (FTIR) spectroscopy and the morphology was identified with Scanning Electron Microscope (SEM) in before and after adsorption of AB dye.
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Affiliation(s)
- M. Kumar
- Anna University Chennai: University College of Engineering Pattukottai, Department of Chemistry, Rajamadam-614 701, India
| | - G. Elangovan
- Anna University Chennai: University College of Engineering Pattukottai, Department of Civil Engineering, Rajamadam-614 701, India
| | - R. Tamilarasan
- Anna University Chennai: University College of Engineering Pattukottai, Department of Chemistry, Rajamadam-614 701, India
| | - G. Vijayakumar
- Arignar Anna Government Arts College, Department of chemistry, Musiri-621 211, India
| | - P.C. Mukeshkumar
- Anna University Chennai: University College of Engineering Pattukottai, Department of Mechanical Engineering, Rajamadam-614 701, India
| | - S. Sendhilnathan
- Anna University Chennai: University College of Engineering Pattukottai, Department of Physics, Rajamadam-614 701, India
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Kumar M, Tamilarasan R. Modeling studies: Adsorption of aniline blue by using Prosopis Juliflora carbon/Ca/alginate polymer composite beads. Carbohydr Polym 2012; 92:2171-80. [PMID: 23399273 DOI: 10.1016/j.carbpol.2012.11.076] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 11/16/2012] [Accepted: 11/26/2012] [Indexed: 11/19/2022]
Abstract
The research article describes the experimental and modeling study for the adsorptive removal of aniline blue dye (AB dye) from aqueous matrices using a Prosopis Juliflora modified carbon/Ca/alginate polymer bead as a low cost and eco-friendly adsorbent. The rate of adsorption was investigated under various experimental parameters such as contact time, adsorbent dose, dye concentration, pH and temperature. The kinetics, equilibrium and thermodynamic studies were assessed to find out the efficiency of the adsorption process. The equilibrium uptake capacity of the adsorption process was found with Freundlich and Langmuir adsorption isotherm equations and it was evaluated by dimensionless separation factor (R(L)). The dynamics of adsorption was predicted by pseudo-first order, pseudo-second order Lagergren's equation and intra particle diffusion model. Adsorption feasibility was assessed with thermodynamic parameters such as isosteric heat of adsorption (ΔH°), standard entropy (ΔS°) and Gibbs free energy (ΔG°) using VantHoff plot. The alginate bead was characterized with FTIR spectroscopy and Scanning Electron Microscopy (SEM).
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Affiliation(s)
- M Kumar
- Department of Chemistry, Anna University Chennai, University College of Engineering, Pattukottai, Rajamadam 614701, India
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Kumar MS, Tamilarasan R, Sreekanth A. 4-Salicylideneamino-3-methyl-1,2,4-triazole-5-thione as a sensor for aniline recognition. Spectrochim Acta A Mol Biomol Spectrosc 2011; 79:370-375. [PMID: 21482181 DOI: 10.1016/j.saa.2011.03.030] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2010] [Revised: 03/02/2011] [Accepted: 03/11/2011] [Indexed: 05/30/2023]
Abstract
Tridentate triazole based Schiff base 4-salicylideneamino-3-methyl-1,2,4-triazole-5-thione has been found to selectively detect toxic aromatic amines such as aniline and benzene-1,4-diamine by simple titration techniques like UV-visible, fluorescence spectral studies (PL) and 1H NMR titrations. The Schiff base receptor utilizes, thione sulfur, NH-thione and the phenolic hydroxyl group to form hydrogen bonded adduct of aniline and benzene-1,4-diamine with high binding affinity, followed by a slow removal of the corresponding hydrogens thus providing a promising candidate and an unique receptor for toxic aromatic amines.
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Affiliation(s)
- M Saravana Kumar
- Department of Chemistry, National Institute of Technology - Tiruchirappalli, Tiruchirappalli 620015, Tamilnadu, India
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Manigandan D, Bharanidharan G, Aruna P, Devan K, Elangovan D, Patil V, Tamilarasan R, Vasanthan S, Ganesan S. Dosimetric characteristics of a MOSFET dosimeter for clinical electron beams. Phys Med 2009; 25:141-7. [PMID: 19128995 DOI: 10.1016/j.ejmp.2008.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2008] [Revised: 09/24/2008] [Accepted: 11/13/2008] [Indexed: 10/21/2022] Open
Abstract
The fundamental dosimetric characteristics of commercially available metal oxide semiconductor field effect transistor (MOSFET) detectors were studied for clinical electron beam irradiations. MOSFET showed excellent linearity against doses measured using an ion chamber in the dose range of 20-630cGy. MOSFET reproducibility is better at high doses compared to low doses. The output factors measured with the MOSFET were within +/-3% when compared with those measured with a parallel plate chamber. From 4 to 12MeV, MOSFETs showed a large angular dependence in the tilt directions and less in the axial directions. MOSFETs do not show any dose-rate dependence between 100 and 600MU/min. However, MOSFETs have shown under-response when the dose per pulse of the beam is decreased. No measurable effect in MOSFET response was observed in the temperature range of 23-40 degrees C. The energy dependence of a MOSFET dosimeter was within +/-3.0% for 6-18MeV electron beams and 5.5% for 4MeV ones. This study shows that MOSFET detectors are suitable for dosimetry of electron beams in the energy range of 4-18MeV.
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Affiliation(s)
- D Manigandan
- Department of Physics, Anna University, Tamil Nadu, India
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Endicott JF, Ramasami T, Gaswick DC, Tamilarasan R, Heeg MJ, Brubaker GR, Pyke SC. Charge-transfer perturbations of the electronic contributions to bimolecular reactions. Nonadiabatic effects observed in energy-transfer and electron-transfer reactions. J Am Chem Soc 2002. [DOI: 10.1021/ja00354a020] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tamilarasan R, Endicott JF. Electronic energy transfer from the charge-transfer excited states of ruthenium(II) polypyridyl complexes to the ligand field excited states of chromium(III). Weakly coupled small energy gap behavior for bimolecular reactions. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100278a013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Endicott JF, Tamilarasan R, Brubaker GR. Experimental probes of the electronic matrix element contributions to bimolecular reactions. The electronic energy transfer reactions of (2E)-chromium(III)-polypyridyl complexes with transition-metal acceptors. J Am Chem Soc 2002. [DOI: 10.1021/ja00277a025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Poch� DS, Brown RJ, Morabito PL, Tamilarasan R, Duke DJ. Use of laboratory robotics for gel permeation chromatography sample preparation: Automation of high-temperature polymer dissolution. J Appl Polym Sci 1997. [DOI: 10.1002/(sici)1097-4628(19970523)64:8<1613::aid-app18>3.0.co;2-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Abstract
U.v.-visible-absorption and e.p.r. spectroscopy were used to study the type 2 and type 3 copper centres in the mercury derivative of laccase. After treatment with peroxide the mercury derivative of laccase exhibits a fully developed absorption band at 330 nm (delta epsilon = 2900 +/- 100 M-1.cm-1, which is characteristic of type 3 copper in the oxidized state. In addition, there is a weak ligand-field absorption at 740 nm (epsilon = 380 +/- 30 M-1.cm-1), which can be assigned to the type 3 pair. Because the e.p.r. spectrum of the type 2 copper is well resolved in the case of the mercury derivative of laccase, for the first time we have been able to observe spectroscopic evidence for a pH-dependent structural transition that has been invoked to explain the kinetics of enzyme reduction [Andréasson & Reinhammar (1979) Biochim. Biophys. Acta 568, 145-156]. According to the e.p.r. data the pKa lies in the range 6-7, and comparisons with a model compound show that the spectral changes can plausibly be interpreted in terms of the deprotonation of a water molecule in the co-ordination sphere of the type 2 copper.
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Affiliation(s)
- R Tamilarasan
- Department of Chemistry, Purdue University, West Lafayette, IN 47907-3699
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Abstract
A simple colorimetric test for the Cu(I) content in blue copper proteins is described. The procedure is based on the formation of a complex between Cu(I) and 2,2'-biquinoline in an acetic acid medium. Analyses of spinach plastocyanin, Pseudomonas aeruginosa azurin and Rhus vernicifera stellacyanin show that the cysteine residue in the type 1 site does not induce Cu(II) reduction under our conditions. There is evidence in laccase samples for the presence of an endogenous reductant that can reduce 0.14 +/- 0.04 mol of Cu(II)/mol of protein; however, the addition of EDTA eliminates the interference. The analysis shows that 25 +/- 2% of the type 3 copper ions are in the reduced form in the resting enzyme and that 80 +/- 15% of the type 3 copper ions are reduced in preparations of type-2-depleted laccase. There is growing interest in the development of chemically modified forms of laccase, and our method should be very useful for establishing the valence state of the metal centres in the various derivatives.
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Affiliation(s)
- P M Hanna
- Department of Chemistry, Purdue University, West Lafayette, IN 47906
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Tamilarasan R, Ramakrishan T, Endicot JF. The photophysical behavior of mixed transition metal-uranyl complexes with polyketonate ligands. The vibronically isolated uranyl chromophore. Inorganica Chim Acta 1988. [DOI: 10.1016/s0020-1693(00)81578-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Ramaraj R, Tamilarasan R, Natarajan P. Luminescence quenching and flash photolysis studies of acrylamidomethylthionine copolymers. ACTA ACUST UNITED AC 1985. [DOI: 10.1039/f19858102763] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Endicott JF, Tamilarasan R, Lessard RB. Isotopic and steric perturbations of 2E-chromium(III) excited state behavior in fluid solution: Evidence for a solvent mediated, strongly coupled quenching channel. Chem Phys Lett 1984. [DOI: 10.1016/0009-2614(84)85762-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Tamilarasan R, Ramaraj R, Subramanian R, Natarajan P. Light-induced electron-transfer reactions at electrodes coated with macromolecular thionine and ruthenium systems. ACTA ACUST UNITED AC 1984. [DOI: 10.1039/f19848002405] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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