Carbon nanodots: recent advances in synthesis and applications

Chauhan Dheeraj Singh,Quraishi M. A.,Verma Chandrabhan 한국탄소학회 2022 Carbon Letters Vol.32 No.7

Due to their fascinating properties, there is a rise in the critical consideration of carbon-based nanomaterials in a plethora of applications. Carbon nanomaterials, such as nanotubes, graphene, fullerenes, and nanodiamonds, have broad applicability and potential research prospects. In the past few years, the developments and consumption of still smaller nanomaterials, namely graphene quantum dots and carbon nanodots or carbon dots (CDs) have been explored. Since carbon as a component exhibits insignificant cytotoxicity and remarkable biocompatibility, CDs have found a wide scope of potential applications. Owing to their fascinating aspects, such as small size, biocompatibility, low toxic nature, environment-friendliness, cost-effectiveness, ease of chemical functionalization, derivatization and surface modification, and photoluminescence tenability, CDs have been widely acknowledged. CDs have found major prospects in the areas of catalysis, sensors, and optical and bio-related applications. CDs are generally synthesized by employing techniques of pyrolysis, laser ablation, arc discharge, electrochemical method; hydrothermal and solvothermal techniques; and microwave and ultrasonic irradiations. This review article presents a brief account of the major properties of CDs, and applications, with particular emphasis on the green and environment-friendly synthesis methodologies. An overview of the microwave and ultrasound irradiation-induced syntheses for the preparation of CDs is presented in the light of green chemistry principles. In addition, some of the green and environmentally benign precursors for the production of CDs are outlined. The most recent work on CDs is included in this review article.

Corrosion inhibition of mild steel in hydrochloric acid by some pyridine derivatives: An experimental and quantum chemical study

K.R. Ansari,M.A. Quraishi,Ambrish Singh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-

The adsorption and corrosion inhibition effect of three pyridine derivatives namely 2-amino-6- methoxy-4-(4-methoxylphenyl) pyridine-3,5-dicarbonitrile (PC-1), 2-amino-6-methoxy-4-(4-methyl- phenyl) pyridine-3,5-dicarbonitrile (PC-2) and 2-amino-6-methoxy-4-phenylpyridine-3,5-dicarboni- trile (PC-3) on mild steel in 1 M HCl was investigated using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization techniques and quantum chemical study. PCs are mixed- type inhibitor mainly cathodic. Activation energy (Ea), equilibrium constant (Kads), free energy of adsorption (DG8ads) were calculated and discussed. The studied inhibitors (PCs) obeyed Langmuir’s adsorption isotherm. Protective film of PCs on mild steel surface was investigated by using SEM and EDX. Quantum chemical parameters were carried out in the framework of the density functional theory (DFT).

Survey of Dicrocoelium dendriticum infection in imported Romani and local sheep (Ovis aries), and potential epidemiological role in Saudi Arabia

Mutee Murshed,Saleh Al-Quraishy,Mohammed M Mares,Osama B. Mohammed,Hossam M. A. Aljawdah 한국축산학회 2022 한국축산학회지 Vol.64 No.6

The epidemiology of parasite infection in local and imported breeds is quite an essential topic in the meat industry and human health. This study aims to determine the prevalence of Dicrocoelium dendriticum in local sheep breeds (Naemi, Najdi, and Harri) and imported breeds from Romania (Romani breed) and the epidemiology of the infection in Saudi Arabia. Morphological description, the relationship between dicrocoeliasis and sex, age, and histological changes were also presented. A total of 6845 slaughtered sheep at Riyadh Automated slaughterhouse were investigated and followed up for 4 months between 2020–2021. It included 4,680 local breeds and 2,165 imported Romanian breeds. Fecal samples and livers and gallbladders from slaughtered animals were examined for apparent pathological lesions. The results indicated that the infection rate in slaughtered animals was 10.6% in imported Romani sheep and 0.9% in the local Naeimi breed. After identifying the parasite morphologically, negative results were obtained from examining feces, gallbladders, and livers of Najdi and Harry sheep breeds. The mean number of eggs per 20 μL/gallbladder was low (72.78 ± 17.8: 76.11 ± 5.07), medium (334.59 ± 90.6: 292.91 ± 26.63), and high (1113.2 ± 22.3: 1004 ± 143.4) in imported and Naeime sheep, respectively. Significant differences were found between gender and age (males and females were 3.67% and 6.31%; > 2 years 4.39%, 1–2 years 4.22%, and 1 year 3.53%) respectively. Histopathological lesions in the liver were more pronounced. Our survey confirmed the presence of D. dendriticum in imported Romani and local Naeimi sheep, and the potential role of imported sheep in the epidemiology of dicrocoeliasis in Saudi Arabia.

Bis-Schiff bases of isatin as new and environmentally benign corrosion inhibitor for mild steel

K.R. Ansari,M.A. Quraishi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.5

Inhibition effect of three bis-Schiff bases of isatin namely (2-methoxybenzylidene) hydrazono) indolin-2-one (HZ-1), (2-hydroxybenzylidene) hydrazono) indolin-2-one (HZ-2) and (4-nitrobenzylidene) hydrazono) indolin-2-one (HZ-3) was studied on mild steel corrosion in 1.0 M HCl by gravimetric measurements, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and quantum chemical study. The values of activation energy (Ea), equilibrium constant (Kads), free energy of adsorption DG8ads, activation enthalpy DH* and activation entropy DS*were discussed. The adsorption of inhibitors on metal followed Langmuir’s adsorption isotherm. SEM and EDX observations confirmed the existence of protective inhibitor film on metal surface. Quantum chemical study supports the comparative inhibition effect of HZs. 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Pyrimidine derivatives as novel acidizing corrosion inhibitors for N80 steel useful for petroleum industry: A combined experimental and theoretical approach

Jiyaul Haque,K.R. Ansari,Vandana Srivastava,M.A. Quraishi,I.B. Obot 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-

The corrosion inhibition performance of two pyrimidine derivatives namely 5-styryl-2,7-dithioxo-2,3,5,6,7,8-hexahydropyrimido[4,5-d] pyrimidin-4(1H) one (PP-1) and 5-(2-hydroxyphenyl)-2,7-dithioxo-2,3,5,6,7,8-hexahydropyrimido[4,5-d]-pyrimidin-4(1H) one (PP-2) on N80 steel corrosion in15% HCl has been studied using gravimetric method, electrochemical impedance spectroscopy (EIS),potentiodynamic polarization, atomic force microscopy (AFM), scanning electron microscopy (SEM), DFT,molecular electrostatic potential and Monte Carlo simulation. The corrosion inhibition efficiencies atoptimum concentration (250 mg/L) are 89.1% (PP-1) and 73.1% (PP-2) respectively at 308 K. The corrosioninhibition efficiency increases with increase in concentration and decreases with temperature. PPsobeyed Langmuir adsorption isotherm. AFM and SEM analyses supported formation of protectivefilm onN80 steel in presence of inhibitors. DFT and Monte Carlo simulation calculations supported experimentalresults.

Pyranpyrazole derivatives as novel corrosion inhibitors for mild steel useful for industrial pickling process: Experimental and Quantum Chemical study

Parul Dohare,K.R. Ansari,M.A. Quraishi,I.B. Obot 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-

In the present work three new corrosion inhibitors namely ethyl 6-amino-3-methyl-4-(p-tolyl)-2,4-dihydropyrano[2,3,C]pyrazole-5-carboxylate (EPP-1), ethyl 6-amino-3-methyl-4(phenyl)-2,4-dihydro-pyrano[2,3,C]pyrazole-5-carboxylate (EPP-2), ethyl 6-amino-3-methyl-4-(3-nitrophenyl)-2,4-dihydro-pyrano[2,3,C]pyrazole-5-carboxylate (EPP-3) were prepared, characterized and their corrosion inhibitionproperties on mild steel were investigated using gravimetric, potentiodynamic polarization andelectrochemical impedance spectroscopy (EIS). The surface morphology of the mild steel was examinedusing scanning electron microscopy (SEM) and atomic force microscopy (AFM). EPP-1 exhibited highestefficiency of 98.8% at 100 mg/L. AFM and SEM studies confirmed the formation of adsorbedfilm on themetal surface. The inhibitors followed the Langmuir adsorption isotherm. Density functional theory(DFT) was used to understand donor–acceptor relationship between inhibitors and metal. Theorientation and binding energy of inhibitor molecules were investigated using molecular dynamicsimulation (MD). A good relationship was obtained between theoretical and experimental results.

Larvicidal and pupicidal activities of Foeniculum vulgare essential oil, trans‐anethole and fenchone against house fly Musca domestica and their inhibitory effect on acetylcholinestrase

Abdel‐Baki Abdel‐Azeem S.,Aboelhadid Shawky M.,Sokmen Atalay,Al‐Quraishy Saleh,Hassan Ahmed O.,Kamel Asmaa A. 한국곤충학회 2021 Entomological Research Vol.51 No.11

The present study was designed to evaluate the insecticidal activity of different concentrations of Foeniculum vulgare and two of its components, trans-anethole and fenchone, against the different stages of Musca domestica. The tested concentrations were applied through a residual film method and topical application on larvae and pupae respectively. Trans-anethole achieved the best results against larvae when compared with those of the fennel or fenchone with LC50 values of 0.58%, 1.57%, and 17.22%, respectively. Moreover, tans-anethole killed 100% of larvae at concentration of 2.5% and fennel achieved the same effect at concentration of 10%, meanwhile fenchone did not reach such an effect at any of the tested concentrations. At the concentration of 10%, fennel oil and trans-anethole induced morphological deformation in the dead larvae such as shrunk bodies with dark colored integument. Regarding the pupicidal activity, fennel oil showed percentage inhibition rate (PIR) of 100% at the concentration of 10% while the same effect was achieved by trans-anethole at concentration of 5%. On the contrary, fenchone did not show any pupicidal activity. Treatment of the third instar house fly larvae with LC5o of fennel oil, trans-anethole, and fenchone significantly inhibited the acetylcholinestrase (AchE) when compared with the control untreated larvae. Additionally, the glutathione-s-transferase (GST) and malondialdehyde (MDA) production significantly increased in the larvae treated with trans-anethole. The results of the present study indicate that the insecticidal activity of fennel oil was mainly attributed to the presence of trans-anethole as a major constituent.

Corrosion inhibition performance of imidazolidine derivatives for J55 pipeline steel in acidic oilfield formation water: Electrochemical, surface and theoretical studies

Singh, Ambrish,Ansari, K.R.,Lin, Yuanhua,Quraishi, M.A.,Lgaz, Hassane,Chung, Ill-Min Elsevier 2019 Journal of the Taiwan Institute of Chemical Engine Vol.95 No.-

<P><B>Abstract</B></P> <P>Present paper deals with the performance of imidazoline derivatives (ATs) as corrosion inhibitor for J55 steel in oil field formation water saturated with CO<SUB>2</SUB>. The inhibition effectiveness of AT-1 was found to 90% at 400 mg/L. Inhibitors addition decreases cathodic as well anodic current densities, and significantly strengthens impedance parameters. Contact angle and SEM/AFM/SECM measurements predicts the hydrophobicity and surface morphology of steel, respectively. Density functional theory (DFT) and molecular dynamic simulation (MD) calculations were performed to investigate the adsorption mechanism of ATs. Radial distribution function (RDF) and the mean-square displacement (MSD) were used to study inhibitor/metal interactions and migration rate of corrosive species, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> J55 steel protection in oil field formation water saturated with carbon dioxide by ATs molecules. </LI> <LI> Potentiodynamic polarization curves reveal that the actions of inhibitors are mixed type but cathodically predominat. </LI> <LI> Examination of surface morphology by SEM, SECM and AFM. </LI> <LI> Correlation of experimental results with Quantum chemical, molecular dynamic stimulation, radial distribution functions and mean-square displacement results. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>