NISCAIR Online Periodicals Repository Collection: IJCT Vol.18(4) [July 2011]

Removal of some thiazole dyestuffs from aqueous media by adsorption onto different types of carbon

Tue, 28 Jun 2011 22:58:59 GMT

Title: Removal of some thiazole dyestuffs from aqueous media by adsorption onto different types of carbon

Authors: El-Katori, E E; Fouda, A S; Al-Sarawy, A A

Abstract: A group of 5-thiazolidinone derivatives based dyestuffs have been synthesized and investigated¹. This paper describes the possibility of using carbon for their removal, as organic pollutants, from aqueous solutions. The removal of these dyestuffs from their aqueous solutions is carried out by using different adsorbent such as granular activated carbon (GAC), carbon soot (CS) and powdered activated carbon (PAC) at different temperatures 25^oC, 40^oC, 50^oC and 60^oC. Kinetics and mass transfer studies are carried out by applying different models such as Lagergren, Weber-Morris, Langmuir and Freundlish. Different kinetic parameters (K_ad ‎, K_p, a, b, R_L, n, K) are calculated from these models. The thermodynamic parameters (E_a^*, H^*, S^* and G^*) are also calculated for the interpretation of the adsorption process.

Page(s): 319-326

A comprehensive treatment method for defluoridation of drinking water

Tue, 28 Jun 2011 22:58:59 GMT

Title: A comprehensive treatment method for defluoridation of drinking water

Authors: Babu, C Anand; Sujish, D; Murugappa, M S; Mohanakrishnan, G; Kalyanasundaram, P; Raj, Baldev

Abstract: The fluoride concentration in ground water is increasing at an alarming rate. Poor ground water recharge, excessive consumption of water and other geological factors contribute to this effect. Conventional reverse osmosis (RO) membrane system has failed because fluoride concentration in permeate is not consistently below 1 mg/L. Moreover, the reject stream of the RO process containing higher fluoride concentration is left untreated. A treatment method has been devised with an objective to reduce fluoride concentration to less than 1 mg/L from fluoride contaminated water using calcium carbonate pretreatment and reverse osmosis. Also a passive adsorption system to treat the reject stream of membrane process has been developed wherein the fluoride concentration in the final effluent is below ambient concentration. This combined system can be used to treat fluoride contaminated water without generating secondary wastes.

Page(s): 314-318

An electrochemical and quantum chemical investigation of some corrosion inhibitors on aluminium alloy in 0.6 M aqueous sodium chloride solution

Tue, 28 Jun 2011 22:58:59 GMT

Title: An electrochemical and quantum chemical investigation of some corrosion inhibitors on aluminium alloy in 0.6 M aqueous sodium chloride solution

Authors: Banerjee, R; Ranjana; Panja, S S; Nandi, M M

Abstract: The role of phthalic acid (I) and related compounds, viz., o-phenylenediamine (II) and anthranilic acid (III) to protect aluminium alloy against corrosion in 0.6 M aqueous sodium chloride solution is studied using potentiodynamic polarization technique and impedance studies. The order of inhibition effect of these compounds is found to be I < II < III. Density functional theory (DFT) has been used to analyze the characteristics of the inhibition mechanism and to describe electronic and structural nature of the inhibitor on the corrosion process. Attempt has been made to correlate the inhibiting properties with the electronic parameters and molecular area of the inhibitors

Page(s): 309-313

Inhibition of corrosion of mild steel in 1 N HCl solutions by Schiff base derived from non-traditional oils

Tue, 28 Jun 2011 22:58:59 GMT

Title: Inhibition of corrosion of mild steel in 1 N HCl solutions by Schiff base derived from non-traditional oils

Authors: Toliwal, S D; Jadav, Kalpesh; Pavagadhi, Tejas

Abstract: 2-alkyl-N-benzylidenehydrazinecarbothioamide of fatty acid hydrazides from nontraditional oils (neem, rice bran and karanja) have been synthesized and evaluated as corrosion inhibitors for mild steel (MS) in hydrochloric acid (HCl) solution by weight loss method. Adsorption of all Schiff bases on MS surface in acid solution obeyed Temkin’s adsorption isotherm. Inhibition efficiency of these compounds increases with increase in concentration of the compound, and vary with solution temperature, immersion time and concentration of acid solution. Various thermodynamic parameters are also calculated to investigate the mechanism of corrosion inhibition.

Page(s): 301-308