Corrosion prevention has been a global phenomenon, particularly in metallic and construction engineering. Most inhibitors are expensive and toxic. Therefore, developing nontoxic and cheap corrosion inhibitors has been a way forward. In this work, L-arginine was successfully grafted on chitosan by the thermal technique using a reflux condenser. This copolymer was characterized by Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and X-ray diffraction (XRD). The corrosion inhibition performance of the composite polymer was tested on mild steel in 0.5M HCl by electrochemical methods. The potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) results were consistent. The inhibition efficiency at optimum concentration rose to 91.4%. The quantum chemical calculation parameters show good properties of the material as a corrosion inhibitor. The molecular structure of the inhibitor was subjected to density functional theory (DFT) to understand its theoretical properties, and the results confirmed the inhibition efficiency of the grafted polymer for corrosion prevention.
The mechanochemically prepared complex [Mn(cip) 2 Cl 2 ] was synthesized using simple neat grinding method and analyzed using spectral studies, elemental analysis and physicochemical properties. The complex shows increase in biological activity compared with both the free ligand of ciprofloxacin and the standard. The IR spectral analysis of the complex, the ligand ciprofloxacin acts as bidentate ligand that indicate a strong band in the spectra at 1707.92 cm -1 and 1628.81 cm -1 which was assigned to υ(C=O) cm -1 υ(COO) cm -1 . It shifted to a lower frequency's regions of 1707.92 cm -1 and 1625.40 cm -1 in the complex indicating the involvement of carbonyl groups of both amide and carboxylic acid in the coordination, the bands at 478.20 cm -1 and 750.39 cm -1 which is absent in the free ligand appeared in the complex was assigned to υ(M-O) and υ(M-Cl) band. The value obtained from molar conductivity at 10.7 Ω -1 cm 2 mol -1 indicate that the complex is non-electrolyte in DMSO. Both the elemental and physicochemical analysis agreed with the proposed structure of the compound and also suggested one metal to two ligands ratio. Due to environmentally friendly, shortest reactions time, inexpensive, production of higher yields the authors recommend the use of mechanochemical methods over solution-based.
Purpose: Many researchers reported the use of chitosan in various applications due to its desirable properties, but then its application in a certain condition is limited due to its lower mechanical stability, lower solubility in certain solvents, and crystallinity of the polymer. Numerous report has been published by many researchers across the world modifying chitosan to enhanced its properties thereby improving its application in various field Methodology: Poly (2-dimethylaminoethyl methacrylate) (Cs-g-PDMAEMA) were successfully synthesized by Ultrasonic methods for the first time. The synthetic method was optimized by varying various reaction parameters and reaction conditions. The grafting was confirmed by characterizing the copolymer with FTIR, XRD, XPS, SEM, TGA, DTG, and DTA. Findings: The results show a good percent grafting and percent yield up to 132%G and 94.7%Y at optimum condition, and also shows a decrease of thermal stability and crystallinity of chitosan, there was improved in porosity of the surface, and complexity of the surface functional group making it a good candidate for metal chelating. Observing various changes in the spectrum of these derivatives and that of pure chitosan in addition to the change in properties of these polymers such as surface morphology, thermal stability, and crystallinity. Uniqe Contribution to Theory, Practice and Policy: It was suggested that this modification may improve the application of these polymers. KeyWords: Chitosan, Cs-g-PDMAEMA, Ultrasonication, Grafting
Corrosion prevention has been one of the major concerns these days various methods have been adopted for corrosion prevention. However, the use of corrosion inhibitors has proven to be the easiest and cheapest method for corrosion prevention. But then most of the conventional inhibitors are expensive and toxic. Therefore the recent focus has been turned to developing non-toxic and cheap corrosion inhibitors. To achieve that a Polyacrylic acid was successfully grafted on chitosan by the thermal method using a reflux condenser. This copolymer was characterized by FTIR, TGA, and XPS. The corrosion inhibition performance of the grafted polymer was tested on mild steel in 0.5 M HCl under different conditions by gravimetric method. Mild steel coupon was analyzed using SEM to understand the effect of the inhibitor on the mild steel corrosion. The results were subjected to various adsorption isotherm models to understand the corrosion mechanism. The weight loss results show high inhibition efficiency of 86.50432 % for 24 hrs. Immersion time at 300 °C conditions. Data best fitted with Langmuir adsorption model with a good correlation coefficient of 0.9933.
Soil Pollution is a serious environmental challenge around the world today. Anthropogenic activities and population explosion have continued to pose great danger to our environment most especially land resources which are fixed. It is against this backdrop that this study assessed the levels of some selected heavy elements (As, Cd, Co, Cr, Cu, Fe, Mn, Ni and Zn). To achieve this, various fractions of exchangeable bound metals, carbonate bound metals, manganese oxide bound metals, iron/manganese bound metals, organic/sulphide bound metals and residual bound metals in soils of Bala, Gantang, She–for, Walang and Yangang Streets as well as Intorok Street which serves as control, Langtang North, Plateau State, Nigeria were assayed using Atomic Absorption Spectrophotometry. The results show that the bioavailable/soluble fractions ranges in (mg/kg) are for: As (BDL – 34.00), Cd (3.00 - 45.00), Co (BDL – 70.00), Cr (42.00 – 155.00), Cu (47.00 – 73.00), Fe (48.00 – 116.00), Mn (46.00 – 119.00), Ni (42.00 – 108.00), Pb (30.00 – 292.00) and Zn (45.00 – 207.00) in all the Streets investigated. The residual/ insoluble fraction ranges in (mg/kg) are for: As (BDL – 5.00), Cd (1.00 – 11.00), Co (BDL – 25.00), Cr (9.00 – 56.00), Cu (11.00 – 19.00), Fe (11.00 – 28.00), Mn (10.00 – 25.00), Ni (10.00 – 21.00), Pb (11.00 – 68.00) and Zn (9.00 – 47.00). The residual fraction is associated with minimal toxicity since migration and transformation of this fraction under general conditions are limited because of being tightly bound to Fe and Mn oxides and hydroxides. The bioavailable fraction is generally observed to be predominant in all the soil, it is usually associated with anthropogenic factors. Higher heavy element concentrations in these streets were recorded in points where there are evidences of organic load discharge and domestic effluents as in the case of Gantang, Yangang, and Bala streets. The fractionation pattern for the six streets assayed showed the northern (hill) part of Langtang North has no potential risk of contamination. However, the plain or southern part of the study area showed high potential risk that if not monitored will result in serious contamination. Topography plays an important role in the risk factor of heavy element contamination in the study area. The overall results showed evidence of some heavy metal pollution in all the Street soils assayed with possible cumulative effect over time.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.