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Wadhwani P.M.,Gujarat University | Panchal V.K.,Rg Shah Science College | Shah N.K.,Gujarat University
Applied Surface Science | Year: 2015

Abstract Corrosion inhibition of mild steel in hydrochloric acid solution by salicylidene-4,4′-dimorpholine (SDM) and SDM assembled on nickel oxide nanoparticles (NiONPs) has been studied with gravimetric, electrochemical impedance spectroscopy (EIS) and polarization techniques. Inhibition was found to increase with increasing concentration of the inhibitors. While studying the temperature effect on corrosion behaviour of SDM and SDM assembled on NiONPs, the inhibition efficiency decreases for SDM only but increases for SDM assembled on NiONPs. The adsorption of both the inhibitors on the mild steel surface obeys the Langmuir adsorption isotherm. The activation energy as well as other thermodynamic parameters (ΔH∗ and ΔS∗) for the inhibition process was calculated. EIS analysis results showed that the capacitive loops for SDM assembled on NiONPs were far away from blank when compared with SDM only. Polarization curve shows that the inhibitors are of mixed type. Further, the protective layer formation was confirmed from atomic force microscopy (AFM) results. Various methods such as EIS-MS, 1H NMR, XRD, FTIR, and DLS were performed for the confirmation of the structure, interaction of SDM with NiONPs and size of NiONPs. © 2015 Elsevier B.V. All rights reserved. Source


Dabhi Y.M.,Rg Shah Science College | Parmar K.A.,Rg Shah Science College | Parmar K.A.,Hemchandracharya North Gujarat University
Asian Journal of Chemistry | Year: 2010

Dairy plants need usually large quantities of clean water. More than 90 % of clean water is converted into wastewater demonstrating very high potential risk of environmental pollution. The present study is undertaken to investigate, under the same analytical conditions, the efficiency of ferric sulfate and ferric chloride used as coagulant in chemical treatment of raw wastewater collected from dairy plant. Results of visual and physicochemical evaluation of chemically treated wastewater indicated significant improvement of their selected characteristics, however different response to the coagulant treatment was observed within the tested samples. Removal efficiencies for individual parameters varied in the wide range between 20.9 and 97.2 %. Source


Parmar K.A.,Hemchandracharya North Gujarat University | Prajapati S.,Hemchandracharya North Gujarat University | Patel R.,Hemchandracharya North Gujarat University | Dabhi Y.,Rg Shah Science College
Journal of Engineering and Applied Sciences | Year: 2011

Dairy plants need usually large quantities of clean water. More than 90% of clean water is converted into wastewater demonstrating very high potential risk of environmental pollution. The present study was undertaken to compare, under the same analytical conditions, the efficiency of ferrous sulfate and alum used as coagulant in chemical treatment of raw wastewater collected from dairy plant. Results of visual and physicochemical evaluation of chemically treated wastewater indicated significant improvement of their selected characteristics, however different response to the coagulant treatment was observed within the tested samples. Removal efficiencies for individual parameters varied in the wide range between 20.9 and 97.2%. © 2006-2011 Asian Research Publishing Network (ARPN). Source

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