NOPR Collection:

Influence of electron releasing groups in benzylidene thiocarbohydrazide and their synergistic effect with iodide ions on acidizing corrosion inhibition of carbon steel in 15% HCl solution - Experimental and theoretical approach

Thu, 01 Jul 2021 00:00:00 GMT

Title: Influence of electron releasing groups in benzylidene thiocarbohydrazide and their synergistic effect with iodide ions on acidizing corrosion inhibition of carbon steel in 15% HCl solution - Experimental and theoretical approach Authors: Jayakumar, Sathiya Priya; Murugadoss, Vignesh; Angaiah, Subramania Abstract: Influence of electron releasing groups in benzylidene thiocarbohydrazide and their synergetic effect with iodide ions on acidizing corrosion inhibition of carbon steel in 15% HCl using chemical and electrochemical methods has been studied. Tafel polarization measurements indicate that these compounds act as mixed-type inhibitors. The adsorption of these compounds obey Langmuir adsorption isotherm and the thermodynamic parameters are also calculated to explain their inhibitive action. The increase in synergism parameter (S_θ) indicates that the inhibition efficiency is improved in the presence of the iodide ions. Further, the density functional theory is used to validate the experimental results. Page(s): 385-401

Biodegradation of phenolic compounds using immobilized Pseudomonas aeruginosa on granular activated carbon: Effect of immobilization, kinetic study and microbial regeneration

Thu, 01 Jul 2021 00:00:00 GMT

Title: Biodegradation of phenolic compounds using immobilized Pseudomonas aeruginosa on granular activated carbon: Effect of immobilization, kinetic study and microbial regeneration Authors: Jain, Deepak M; Singh, Vasdev Abstract: Phenol and its derivatives are one of the major pollutants present in industrial effluents. In this work, Pseudomonas aeruginosa (ATCC 9027) has been effectively used to carry out biodegradation of phenol, 3-aminophenol, and catechol. In order to develop an industrially viable technology, P. aeruginosa has been immobilized on granular activated carbon (GAC). The biofilm thickness was found in the range 14 to 34 μm. The adsorbed P. aeruginosa on the GAC is found to be efficient for bio-degradation of the phenolic compounds and in addition they also helped in regeneration of the activated carbon systems which in turn reduce the operability cost. The extent of bio-regeneration varied between 33-66%. Haldane’s growth kinetic equation is found to be suitable to fit the specific growth rate data of P. aeruginosa. Page(s): 402-411

Kinetics and Isotherms modeling of methylene blue adsorption by Black Carbon using the shells of apricot kernels

Thu, 01 Jul 2021 00:00:00 GMT

Title: Kinetics and Isotherms modeling of methylene blue adsorption by Black Carbon using the shells of apricot kernels Authors: Ammar, Fadel; Rachid, Chebbi; Amel, Aidi; Naima, Azri Abstract: Shells of apricot kernels have taken chosen to fabricate the activated black carbon to eliminate the basic dye (methylene blue) from aqueous solutions. The results show the effects of various working conditions counting initial dye concentration (0–25 mg/L), adsorbent dose (0.1–3 g/L), temperature (20–45°C) and pH (2–12) on the uptake of methylene blue were investigated in this experiment-lab study. The adsorption of cationic dye favoured at low temperatures near to the neutral and acids pH for the aqueous solution. Three models have been employed to describe the experimental data for the adsorption isotherm: Langmuir, Freundlich, and Temkin equations. Langmuir isotherm model shows the best results, the thermodynamic parameters such as ΔG, ΔH, and ΔS for the adsorption of methylene blue. The elimination kinetics of methylene blue on black carbon treated at 600oC have been examined by using the pseudo-first-order, pseudo-second-order model equations and intra-particle diffusion, and the pseudo-second-order model was found to define the adsorption process better than the pseudo-first-order equation. Page(s): 412-420

Effect of 1,2,3- triazole derivative on the dissolution performance of mild steel in 1M HCl medium

Thu, 01 Jul 2021 00:00:00 GMT

Title: Effect of 1,2,3- triazole derivative on the dissolution performance of mild steel in 1M HCl medium Authors: Vijayalakshmi, K; Punitha, N; Rengamy, R; Elangovan, J Abstract: The corrosion mitigation behaviour of 1-benzyl-4-(naphthalen-2-yl)-1H-1,2,3-triazole (BNT) has been explored on mild steel in 1M HCl medium employing chemical and electrochemical techniques. The observed results illustrate that the hindered efficacy was increased as increasing concentration of BNT and with rising temperatures. The electrochemical studies point out that the inspected BNT is a mixed kind inhibitor and the adsorption isotherm discussions proposed the inhibition mechanism obeyed Langmuir isotherm. The kinetic and thermodynamical parameters exposed that the adsorption process is endothermic, spontaneous and the mechanism is both physical and chemical adsorption. Further, the morphological investigations have been carried out by SEM, EDS and AFM techniques. The highest efficiency perceived for BNT is found to be 91.35% and behaved as a proficient inhibitor against mild steel corrosion in the 1M HCl environment. Page(s): 421-428