Entity

Time filter

Source Type


Parveen M.F.,Hajee Karutha Rowther Howdia College | Umapathy S.,Madurai Kamaraj University | Dhanalakshmi V.,KCET | Anbarasan R.,National Taiwan University
Journal of Applied Polymer Science | Year: 2010

Nanosized Fe(OH)2 was synthesized by a coprecipitation method. Peaks between 500 and 1250 cm-1 in Fourier transform infrared (FTIR) spectroscopy confirmed the presence of metal hydroxide stretching. X-ray diffraction showed the suppressed crystalline system of Fe(OH) 2/aniline (ANI) due to the presence of a higher weight percentage of the dispersing agent, ANI. Thermogravimetric analysis implied that 75.5 wt % of residue remained up to 800°C. High resolution transmission electron microscope (HRTEM) analysis of Fe(OH)2/ANI revealed that its size ranged from 10 to 50 nm with a rodlike morphology. Scanning electron microscopy implied that pristine Fe(OH)2 had a nanotriangular platelet morphology, and a higher weight percentage of dispersing agent intercalated with Fe(OH)2 had a spheroid with an agglomerated structure. The (UV-visible) spectrum implied the presence of Fe2+ ions at 326 nm and the existence of an amino group intercalated with Fe(OH)2 showed a sharp peak at 195 nm, the intensity of which increased with increasing intercalated dispersing agent weight percentage. Photoluminescence showed that ANI-intercalated Fe(OH)2 showed a lesser intensity than the pristine Fe(OH)2. © 2010 Wiley Periodicals, Inc. Source


Parveen M.F.,Hajee Karutha Rowther Howdia College | Umapathy S.,Madurai Kamaraj University | Dhanalakshmi V.,KCET | Anbarasan R.,KCET | Anbarasan R.,National Taiwan University
Composite Interfaces | Year: 2010

Nano-sized Zn(OH)2 was synthesized by the co-precipitation method. Further, the structure and properties were tested with FTIR, UV-visible spectroscopy, XRD and TGA as analytical tools. The structural morphology and size of the Zn(OH)2 synthesized by the co-precipitation method were determined by using FESEM and HRTEM techniques. The effect of the synthesized nano-sized Zn(OH)2 on the structural and thermal properties of PVA matrix was tested and discussed. © Koninklijke Brill NV, Leiden, 2010. Source


Shanmugaraju A.,Arul Anandhar College | Syed Ibrahim M.,Arul Anandhar College | Moon Y.-J.,Kyung Hee University | Mujiber Rahman A.,Hajee Karutha Rowther Howdia College | Umapathy S.,Madurai Kamaraj University
Solar Physics | Year: 2015

We analyzed the physical characteristics of 40 halo coronal mass ejections (CMEs) and their geo-effective parameters observed during the period 2011 to 2013 in the rising phase of Solar Cycle 24. Out of all halo CMEs observed by SOHO/LASCO, we selected 40 halo CMEs and investigated their geomagnetic effects. In particular, we estimated the CME direction parameter (DP) from coronagraph observations, and we obtained the geomagnetic storm disturbance index (Dst) value corresponding to each event by following certain criteria. We studied the correlation between near-Sun parameters of CMEs such as speed and DP with Dst. For this new set of events in the current solar cycle, the relations are found to be consistent with those of previous studies. When the direction parameter increases, the Dst value also increases for symmetrical halo CME ejections. If DP>0.6, these events produce high Dst values. In addition, the intensity of geomagnetic storm calculated using an empirical model with the near-Sun parameters is nearly equal to the observed values. More importantly, we find that the geo-effectiveness in the rising phase of Solar Cycle 24 is much weaker than that in Cycle 23. © 2015, Springer Science+Business Media Dordrecht. Source


Sundaram M.M.,Center for Research and Post Graduate studies in Chemistry | Sivakumar S.,Center for Research and Post Graduate studies in Chemistry | Sivakumar S.,Hajee Karutha Rowther Howdia College
Indian Journal of Environmental Protection | Year: 2013

The present study investigate the successful use of eco-friendly adsorbents areca nut shell carbon (ASC) and cashew nut shell carbon (CSC) to remove congo red (CR) dye. In the batch experiments, various parameters, such as effect of initial concentration, contact time, dose, pH and particle size has been studied. The amount of dye removal increased with decrease in the initial concentration, decrease in particle size, decrease in pH, increase in contact time and dosage. The experimental results were analysed by using Freundlich and Langmuir isotherm models and first order kinetic equations. .The intra particle diffusion study shown that the process favour first order kinetics. Surface morphology of the adsorbents ASC and CSC before and after adsorption is studied by scanning electron microscopy (SEM). The result indicate that the low cost adsorbents cashewnut shell carbon (CSC) and Areca nut shell carbon (ASC) can be used as an effective adsorbents alternative to commercial activated carbon (CAC) in wastewater treatment for the removal of congo red (CR). © 2013 - Kalpana Corporation. Source


Shahul Hameed K.,Hajee Karutha Rowther Howdia College | Muthirulan P.,Center for Research and Post Graduate studies in Chemistry | Meenakshi Sundaram M.,Center for Research and Post Graduate studies in Chemistry
Arabian Journal of Chemistry | Year: 2013

The use of low-cost, easily obtained and eco-friendly adsorbents has been employed as an ideal alternative to the current expensive methods of removing dyes from wastewater. This study investigates the potential use of activated carbons such as aamla seed carbon (ASC), jambul seed carbon (JSC), tamarind seed carbon (TSC) and soapnut carbon (SNC) for the removal of chromotrope (CH) dye from simulated wastewater. The obtained results were compared with that of Commercial Activated Carbon (CAC). The effects of different system variables, adsorbent dosage, pH and particle size were studied. The results showed that as the amount of the adsorbent increased, the amount adsorbed per unit mass decreased accordingly. Optimum pH value for dye adsorption was determined as ∼2.0. The adsorption of chromotrope fit well into pseudo-second-order rate equation. The adsorption also obeyed Langmuir and Redlich-Peterson equations better than Temkin, Freundlich and Dubinin-Radushkevich (D-R) equations. The adsorption capacities of low cost adsorbents were found to be in the following order ASC > JSC > TSC > SNC. The activated carbons prepared were characterized by FT-IR and SEM analysis. © 2013. Source

Discover hidden collaborations