NOPR Collection:

Inhibition of corrosion of stainless steel (304 SS) by N-(2-mercaptophenyl)-N^'-phenyl thiourea in hydrochloric acid

2013-10-05T16:37:47Z

Title: Inhibition of corrosion of stainless steel (304 SS) by N-(2-mercaptophenyl)-N^'-phenyl thiourea in hydrochloric acid Authors: Herle, Ramadev; Shetty, Prakash; Shetty, S Divakara; Kini, U Achutha Abstract: The inhibition effect of N - (2-mercaptophenyl) –N^'- phenyl thiourea (MPTU) on the corrosion of 304 SS in 1 N HCl medium has been investigated by potentiodynamic polarization, electrochemical impedance spectroscopy and weight loss methods. The results reveal that MPTU is an efficient mixed inhibitor with efficiency of greater than 90% at 40ºC. The adsorption of this inhibitor on the 304 SS surface obeys Temkins adsorption isotherm, and the inhibition is governed by physisorption mechanism. The influence of parameters like temperature and inhibitor concentration on the corrosion rate of 304 SS has also been investigated. The thermodynamic parameters deduced for the adsorption process reveal a strong interaction and spontaneous adsorption of MPTU on the alloy steel surface. Page(s): 317-322

Stability indicating and simultaneous determination of cinnarizine and piracetam from capsule dosage form by reversed phase high performance liquid chromatography

2013-10-05T16:37:50Z

Title: Stability indicating and simultaneous determination of cinnarizine and piracetam from capsule dosage form by reversed phase high performance liquid chromatography Authors: Navaneethan, G; Karunakaran, K; Elango, K P Abstract: A stability indicating reversed phase HPLC assay method has been used for the simultaneous assay of piracetam and cinnarizine drugs in hard gelatin capsule formulation. The separation is achieved by gradient elution using Hypersil BDS C8 column (250 mm × 4.6 mm, i.d. 5 µm particle size) with mobile phase (A) consisting of 0.015 M dipottassium hydrogen phosphate and 2 mL of triethyl amine adjusted at pH 6.0 with orthophosphoric acid and acetonitrile (990:10 v/v); and mobile phase (B) consisting of 2 mL of orthophosphoric acid in 1000 mL of acetonitrile and with a flow rate of 0.6 mL min^-1. The retention time is found to be approximately 11 min for PR and 51 min for CN. The analysis is conducted at ambient temperature and monitored using a diode array UV-Vis detector set at wavelength 205 nm. The proposed method is found to be specific, linear, accurate and precise for the simultaneous determination of both the drugs from capsule. Page(s): 323-326

Removal of Cr (VI) by Prosopis cineraria leaf powder—A green remediation

2013-10-04T16:35:56Z

Title: Removal of Cr (VI) by Prosopis cineraria leaf powder—A green remediation Authors: Sinha, Ruchi; Bhati, Mahendra; Sumit; Lal, Magan; Gupta, Vikal Abstract: Attempt has been made to study the Cr(VI) adsorption capacity of Prosopis cineraria leaf powder from industrial waste water using batch adsorption technique. The effects of various parameters, such as temperature, pH, adsorbent particle size and initial chromium concentration on adsorption process have also been studied. The adsorption process of chromium (VI) has been tested with Langmuir and Freundlich isotherm models. Adsorption data are well described by Freundlich isotherm with maximum adsorption capacity of 80% at 50°C, initial metal concentration of 50 mg/L and an adsorbent dosage of 0.5 g. The adsorption process follows pseudo-second order rate mechanism and rate constant is calculated at 30°C. Page(s): 312-316

Microwave induced KOH activation of guava peel carbon as an adsorbent for congo red dye removal from aqueous phase

2013-10-03T16:34:10Z

Title: Microwave induced KOH activation of guava peel carbon as an adsorbent for congo red dye removal from aqueous phase Authors: Singh, Pardeep; Raizada, Pankaj; Pathania, Deepak; Sharma, Gaurav; Sharma, Pankaj Abstract: The adsorption capacity of activated carbon prepared from guava fruit peel waste has been studied for congo dye. The activation process is carried out under microwave radiations in the presence of KOH. The guava peel based activated carbon (GPAC) and unactivated carbon (GPUC) have been characterized using Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction. The comparative adsorption behavior of GPAC, GPUC and commercially activated carbon (CAC) has been studied for the congo red dye removal using batch adsorption experiments. The non-linear Langmuir and Frendulich isotherm models are used to stimulate the equilibrium data. The equilibrium data is represented by the Langmuir isotherm model. The kinetic model shows that pseudo second order kinetics has best fit to the experimental data (R²>0.90). Thermodynamic studies conclude that adsorption process is spontaneous and endothermic in nature. GPAC has emerged as efficient adsorbent for congo dye as compared to GPUC and CAC. Further, desorption studies show that 35.74 % of metal ions can be recovered by desorption in first cycle and adsorbent can be reused. Page(s): 305-311

NOPR Collection:

Inhibition of corrosion of stainless steel (304 SS) by N-(2-mercaptophenyl)-N'-phenyl thiourea in hydrochloric acid

Stability indicating and simultaneous determination of cinnarizine and piracetam from capsule dosage form by reversed phase high performance liquid chromatography

Removal of Cr (VI) by Prosopis cineraria leaf powder—A green remediation

Microwave induced KOH activation of guava peel carbon as an adsorbent for congo red dye removal from aqueous phase

Inhibition of corrosion of stainless steel (304 SS) by N-(2-mercaptophenyl)-N^'-phenyl thiourea in hydrochloric acid