Kandasamy Jothivenkatachalam | Anna University (original) (raw)

Papers by Kandasamy Jothivenkatachalam

An entry from the Cambridge Structural Database, the world's repository for small molecule cr... more An entry from the Cambridge Structural Database, the world's repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

ChemInform, 2013

The title compound is prepared by treatment of [Co(NH3)5](ClO4)3 with NaHCO3 in H2O at pH 8 (333 ... more The title compound is prepared by treatment of [Co(NH3)5](ClO4)3 with NaHCO3 in H2O at pH 8 (333 K, 4 h).

Chemosphere, 2022

An efficient BiVO4nanocatalyst with Erbium (Er) and Yttrium (Y) doping was synthesized via a faci... more An efficient BiVO4nanocatalyst with Erbium (Er) and Yttrium (Y) doping was synthesized via a facile microwave irradiation route and the obtained materials were further characterized through various techniques such as p-XRD, FT-IR, FE-SEM, HR-TEM, UV-Vis DRS, PL, LSV, and EISanalysis. The obtained results revealed that the rare metals induce the stabilization of the monoclinic-tetragonal crystalline structure with a distinct morphology. The yttrium doped BiVO4 (Y-BiVO4) monoclinic-tetragonal exhibited anefficient photoelectrochemical water splitting and photocatalytic performanceare compared to bare BiVO4. TheY-BiVO4 indicated increased results of photocurrent of 0.43 mA/cm2and bare BiVO40.24 mA/cm2. Also, the Y-doped BiVO4 nanocatalyst showed the maximum photocatalytic activity for the degradation of MB, MO, and RhB. A maximum degradation of 93%, 85%, and 91% was achieved for MB, MO, and RhB respectively, within 180 min under the visible light illumination. The photocatalytic decomposition of acetaldehyde also was performed. The improved photoelectrochemical water splitting and photocatalytic activity are due to the narrowing the bandgap, leading to extending the photoabsorption capability and reducing the recombination rate of photoexcited electron-hole pairs through the formation inner energy state of the rare earth metals. The current study disclosed that the synthesis of nanomaterials with crystal modification could be a prospectivecontender forhydrogen energy production as well as to the photocatalytic degradation of organic pollutants.To the best of our knowledge, both photocatalytic and photoelectrochemical studies were never been reported before for this type of material.

Materials Research Express, 2018

Binary and ternary combined ZnO/Ag and ZnO/Ag/g-C3N4 films were coated onto meshes (SSM) made of ... more Binary and ternary combined ZnO/Ag and ZnO/Ag/g-C3N4 films were coated onto meshes (SSM) made of stainless steel using a homemade tubular nebulizer spray method. The photocatalytic dye degradation treatment with the presence of the prepared samples under UV-visible irradiation shows that ZnO/Ag/g-C3N4 film acts as a better photocatalytic material than ZnO/Ag. The degradation efficiency of binary catalyst is found to be 91% and 90% for MB and MG dyes, respectively whereas the corresponding values of the ternary catalyst are 99% and 95%, respectively. The reasons for the enhancement in the photocatalytic dye degradation of ternary catalyst are explained with suitable mechanism with the help of various analytical studies such as XRD, PL, FT-IR, SEM,TEM, HRTEM, EDAX, DRS and XPS. DFT calculations have been done for the validation of the experimental results.

Journal of Molecular Structure, 2022

International journal of pharma and bio sciences, 2013

Curcumin, the active molecule present in Curcuma longa is known for its antitumour, antioxidant, ... more Curcumin, the active molecule present in Curcuma longa is known for its antitumour, antioxidant, antiarthritic, anti-amyloid, anti-ischemic, anti-inflammatory activities. In addition, it may also be effective in treating malaria, prevention of cervical cancer, etc. High-performance thin-layer chromatography (HPTLC) method has been employed for determination of curcumin in four varieties of turmeric and compared with standard curcumin. The HPTLC separation was performed on precoated aluminium backed HPTLC plates of 0.2 mm layer thickness with silica gel 60 F254 chloroform: methanol (9.5:0.5) employed as mobile phase for the identification and quantification of Curcuminoids in the turmeric varieties. The plate was developed up to 80 mm at temperature of 20 ± 4C for 10 min. of chamber saturation. The proposed method may be useful as an accurate, simple, cost effective and sensitive for quantitative estimation of curcumin in Curcuma longa extracts.

Nature Environment and Pollution Technology, 2008

The paper deals with study of physico-chemical parameters such as pH, electrical conductivity, to... more The paper deals with study of physico-chemical parameters such as pH, electrical conductivity, total dissolved solids, total hardness, total alkalinity, calcium, magnesium, manganese, ammonia, chloride, sulphate and fluoride of ground waters from seven sampling stations in Kuniamuthur and Madukkarai areas of Coimbatore. The analysed data were compared with standard values recommended by WHO, USPH, BIS and ICMR, and the variations were notable for the parameters like total hardness and electrical conductivity for few samples.

Essential and non-essential heavy metals like Mn, Zn,Fe, Ni, Cu, Cr, Pb, Cd,As and Hg were quanti... more Essential and non-essential heavy metals like Mn, Zn,Fe, Ni, Cu, Cr, Pb, Cd,As and Hg were quantified in selected medicinal plants including Acalypha indica Linn., Enicostemma littorale Blume. Nelumbo nucifera Gaertn, Sphaeranthus indicus Linn., and Withania somnifera., by using atomic absorption spectrometry. The main purpose of this study was to document evidence of essential and non-essential heavy metals in these herbs, which are extensively used in the preparation of herbal products and standardized extracts. High iron contents were observed in W. somnifera 191.37 ppm, Acalypha indica Linn 156.59 ppm, Enicostemma littorale Blume, 95.37 ppm, Nelumbo nucifera Gaertn 171.38 ppm, Sphaeranthus indicus Linn. 169.41 ppm. The concentration of other heavy metals particularly Cr, Pb, Cd, As, Hg was found on the lower side in the selected herbs

Ionics, 2021

Earth-abundant bifunctional electrocatalysts for water splitting are imperative to realise cost-e... more Earth-abundant bifunctional electrocatalysts for water splitting are imperative to realise cost-effective sustainable energy generation. However, selection of suitable materials with apposite properties for the same is highly challenging, not to mention the complicated two or more-step preparation routes with binders and templates involved during synthesis process. Herein, we report for the first time on nickel-copper oxide nanocomposite films as bifunctional electrocatalyst for HER/OER prepared using one-step, binder-free, cost-effective, jet nebulizer spray pyrolysis (JNSP) technique. Synergetic performance of NiO and CuO is investigated by varying Cu concentrations in Cu x Ni 1 − x O mixed oxide system. Structural, morphological and chemical composition of the as-prepared Cu x Ni 1 − x O ( x = 0, 0.1, 0.2 and 0.5) films were investigated from XRD, FESEM, EDS and XPS studies. Point defects such as oxygen and nickel vacancies that promote charge-transfer electronic conductivity favourable for electrochemical reactions were noted from XPS spectra. Variation in optical band gap and Urbach energy with Cu incorporation in NiO is observed from optical studies, whereas change in electrical parameters is noted from four-probe system. When subjected to electrochemical studies using conventional three-electrode setup, as expected, cubic NiO and monoclinic CuO coexisting as nanocomposite in the same matrix exhibited better HER/OER performance when compared to pristine single-phased cubic NiO.

e-Journal of Surface Science and Nanotechnology, 2016

The investigation of adsorption behavior of Basic Green 4, a basic dye was carried out using mult... more The investigation of adsorption behavior of Basic Green 4, a basic dye was carried out using multi-walled carbon nanotubes (MWNTs) and nano porous activated carbon materials prepared from Turmeric Industrial Waste (TWAC) as the adsorbents in the batch mode contact time process with respect to initial dye concentration (20, 40 and 60 mg/L), temperature (303,318 and 333 K) and pH. The surface area and pore size volumes for the TWAC and MWNTs were estimated by nitrogen adsorption measurements at 77 K. The morphology of the carbon samples were studied by scanning electron microscopy. A comparison of kinetic models applied to adsorption of Basic Green 4 on both TWAC and MWNTs were evaluated for pseudo first-order, pseudo second-order and Elovich models respectively. Results prove that the pseudo second order kinetic model was found to correlate the experimental data well for both adsorbents. Langmuir and Freundlich adsorption isotherm studies were also measured. The film and pore diffusion kinetics were studied to propose plausible mechanism for the adsorption of Basic Green 4 dye using both multi-walled carbon nano tubes (MWNTs) and nano porous activated carbon materials prepared from Turmeric Industrial Waste (TWAC).

Nano Hybrids and Composites, 2017

The recent development of nanoparticles in commercial media has great attention due to uniformity... more The recent development of nanoparticles in commercial media has great attention due to uniformity and stability of the materials. In our present investigation cadmium sulfide (CdS), a direct bandgap semiconductor material has well defined optoelectronic properties in the applications of photocatalysis, photoelectrocatalytic and nonlinear optics. Zeolite which offers a perfect host material for the production of highly uniform nanoparticles with apparently circulated provisions and inhibiting the aggregation of nanoparticles and also helps in the protection from the attack by water and other reactive compounds. In order to stabilize the CdS nanoparticles and to prevent their aggregations, CdS is sheltered within the zeolite Y material. This novel assembly was synthesized by ion exchange method. In order to increase the photocatalytic activity of CdS, ZnO nanoparticles were incorporated into the zeolite Y assembly. The photocatalytic activity of the CdS/ZnO-Y towards the degradation o...

Physica B: Condensed Matter, 2017

Abstract We propose an acid-free and environmental friendly surfactant based approach to anchor z... more Abstract We propose an acid-free and environmental friendly surfactant based approach to anchor zinc oxide (ZnO) nanoparticles on graphene. Herein, liquid-phase exfoliated graphene in water by ultrasonic waves has been used to prepare graphene-ZnO (G-ZnO) nanocomposites that circumvent the use of various toxic acids and chemicals which are generally used in the preparation of graphene-based nanocomposites. Oxygen vacancy related defect peaks observed by Raman and photoluminescence confirm the formation of C–O–Zn bond due to the synergistic interaction of carbon and zinc via oxygen atoms in G-ZnO nanocomposites. The enhanced photocatalytic behavior of G-ZnO under visible light as evaluated using the dye Rhodamine B holds its genesis from the intrinsic oxygen defects in G-ZnO. Furthermore, graphene acts as electron sink for accumulation of charges from defect levels of ZnO, which controls recombination of charge carriers. It is envisaged that the acid-free and facile strategy can be a potential route for the preparation of graphene-based hybrid materials using liquid-phase exfoliation methodology.

International Journal of Biological Macromolecules, 2016

Chitosan (CS), a seaweed polysaccharide is a natural macromolecule which is widely being used in ... more Chitosan (CS), a seaweed polysaccharide is a natural macromolecule which is widely being used in medical applications because of its distinctive antimicrobial and anticancer properties. Silver, a noble metal, is also receiving wide attention for its potential usage in antimicrobial and anticancer therapeutics. In this study, an effective way of reduction of silver using chitosan at varying reaction temperatures and an optimized concentration of silver were performed. The optical, structural, spectral, morphological and elemental studies of the biosynthesized chitosan-silver (CS-Ag) nanocomposites were characterized by several techniques. The synthesized CS-Ag nanocomposites exhibit particle size around 20 nm and were further exploited for potent biological applications in nanomedicine due to their nanometric sizes and biocompatibility of chitosan. The antimicrobial activity of the biosynthesized CS-Ag nanocomposites exhibits zone of inhibition ranged between 09.666 ± 0.577 and 19.000 ± 1.000 (mm). The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were from 8 to 128 µg mL-1 and 16 to 256 µg mL-1 respectively, with the highest antimicrobial activity shown against Gram-negative Salmonella sp. The synergistic effect of chitosan and silver as a composite in nanometric size revealed significant IC 50 value of 29.35 µg mL-1 and a maximum of 95.56 % inhibition at 100 µg mL-1 against A549 lung cancer cell line, resulting in potent anticancer effect.

RSC Advances, 2016

C–N–S tridoped TiO2nanoparticles were synthesized by a sol–gel method using thiourea as a compoun... more C–N–S tridoped TiO2nanoparticles were synthesized by a sol–gel method using thiourea as a compound source of carbon (C), nitrogen (N) and sulphur (S).

RSC Adv., 2014

We report the photocatalytic dye degradation properties of self-assembled gallium nitride (GaN) n... more We report the photocatalytic dye degradation properties of self-assembled gallium nitride (GaN) nanowires grown using chemical vapor deposition.

Materials Focus, 2015

Dye sensitized solar cells (DSSCs) have received a great significance in the field of photovoltai... more Dye sensitized solar cells (DSSCs) have received a great significance in the field of photovoltaic (PV) devices. In recent day’s polymer materials have been investigated extensively in solar cell application especially in DSSC. Polymer electrolytes are probable candidate to fabricate stable and efficient DSSC devices, since its unique ionic conductivity, good thermal, long-term stability and flexible properties. Redox couple based liquid electrolytes producing several potential problem therefore polymer electrolytes believed as promising alternative tool to replace the liquid electrolytes. This review summarizes the overview on the presently identified polymer electrolytes in DSSC and also discuss prospects of polymer electrolytes such as solid-state polymer electrolytes and quasi-solid-state (gel) polymer electrolytes in solar cell performance, their progress in a detailed manner.

Oxide-based Materials and Devices VI, 2015

C-N-S tridoped TiO2 nanoparticles were synthesized by sol-gel method using thiourea as a source c... more C-N-S tridoped TiO2 nanoparticles were synthesized by sol-gel method using thiourea as a source compound for carbon (C), nitrogen (N) and sulphur (S). The crystalline phase and morphology of the doped and undoped TiO2 nanoparticles are analyzed by XRD and FESEM. FTIR confirms the bonding interaction of C, N and S in TiO2 lattice. Compared to the doped samples undoped sample annealed at 600°C shows more absorbance in the visible region due to the existence of rutile phase. Presence of oxygen vacancy is confirmed from the photoluminescence spectra. XPS indicates the existence of the carbon atom in the form of carbonaceous species on the surface of the TiO2 and absorbs the visible light to enhance the photocatalytic activity. The photocatalytic activity of C-N-S tridoped TiO2 nanoparticles were evaluated for the degradation of Rhodamine B organic dye under the visible light irradiation. Maximum of ~ 100% degradation exhibits for the C-N-S tridoped sample (D4) calcined at 600°C. This highly active photocatalytic performance is associated with the existence of oxygen vacancies, the acidic sites on the surface (SO4 2-) and the mixed phases of anatase and rutile in TiO2 lattices.

Materials Focus, 2014

ABSTRACT Zinc oxide nanopillar was synthesized by simple and cost-effective wet chemical method a... more ABSTRACT Zinc oxide nanopillar was synthesized by simple and cost-effective wet chemical method and characterized by several techniques. The XRD confirmed hexagonal wurtzite phase and the crystal quality of the nanostructure. The band gap was calculated using Tauc's plot from reflectance spectra. The morphology of ZnO nanostructure was studied using SEM analysis. The prepared ZnO nanopillar shows photoelectrocatalytic activity against oxalic acid oxidation.

The photocatalyst CoWO 4 was synthesized by co-precipitation method with slight modification and ... more The photocatalyst CoWO 4 was synthesized by co-precipitation method with slight modification and well characterized by FT-IR, UV-vis diffuse reflectance spectra, X-ray diffraction, AFM and field emission scanning electron microscope techniques. The elemental composition present in the photocatalyst was confirmed by recording EDX spectrum. The photocatalytic activity of CoWO 4 for the decolourization of methyl orange (MO) was investigated under solar, visible and UltraViolet (UV) light irradiation. The remarkable photocatalytic decolourization of MO was achieved under solar and visible light irradiation than that of TiO 2. The high surface area of 55.0527 m/g enhances the adsorption of anionic dye MO on the surface of the positively charged catalyst at pH 3 thus increases the photocatalytic activity. Under UV light irradiation, photocatalytic activity increases which may be due to high energy of photons. The essential parameters such as amount of catalyst, dye concentration and initial pH influence the photocatalytic efficiency of CoWO 4. The first order rate constant for the decolourization reaction was derived using Langmuir-Hinshelwood kinetic model.