Mahmood M. S. Abdullah

Anticorrosive assay-guided isolation of active phytoconstituents from Anthemis pseudocotula extracts and a detailed study of their effects on the corrosion of mild steel in acidic media

In this study, anticorrosive properties of various extracts (methanolic, aqueous methanolic and water extracts) of Anthemis pseudocotula for mild steel in 1.0 M HCl media is screened for the first time. Among the various tested extracts, the methanolic extract of A. pseudocotula shows the highest corrosion inhibition activity. Anticorrosive assay-guided isolation of this methanolic extract results in the isolation of a highly potent anticorrosive compound, APB (luteolin-7-O-β-D-glucoside). The anticorrosive effects of APB on mild steel in 1.0 M HCl media were evaluated in detail using gravimetric, Tafel plots, linear polarization, electrochemical impedance spectroscopy and SEM and EDS techniques. Tafel plots reveal that APB acts as a mixed-type inhibitor. The adsorption behaviour of this green inhibitor on the mild-steel surface obeys the Langmuir adsorption isotherm. A surface morphology study through SEM and EDS analysis displays a noteworthy upgraded surface morphology of the mild steel plate in the presence of the green inhibitor in 1.0 M HCl media. The results obtained from electrochemical tests and weight loss measurements are in good agreement which shows excellent inhibition efficiency for the natural compound APB.

Novel magnetic iron oxide nanoparticles coated with sulfonated asphaltene as crude oil spill collectors

This work aims to apply modified asphaltene for capping of magnetite to form dispersed hydrophobic magnetic nanomaterials for environmental applications. In this respect, asphaltene was separated from heavy crude oil and functionalized by sulfonation in order to apply as a capping agent for magnetic materials to collect the heavy crude oil that was not easily collected or dispersed by using different oil spill control techniques. The coprecipitation method was used to prepare magnetite in the presence of sulfonated asphaltene as a capping agent. The magnetite nanomaterials were confirmed by thermogravimetric analysis, X-ray powder diffraction, transmittance electron microscopy and a vibrating sample magnetometer. Finally, sulfonated asphaltene magnetite nanomaterials were applied at different concentrations to collect a heavy crude oil spill after application of an external magnetic field as novel magnetic materials. They achieved remarkable oil spill collection efficiency with a reduction in the overall cost of the materials when compared with available techniques.

Correction to ‘Investigation on preferably oriented abnormal growth of CdSe nanorods along (0002) plane synthesized by henna leaf extract-mediated green synthesis’

[This corrects the article DOI: 10.1098/rsos.171430.].

Green Synthesis of Hydrophobic Magnetite Nanoparticles Coated with Plant Extract and Their Application as Petroleum Oil Spill Collectors

In this study, an easy, rapid and eco-friendly method was used successfully to synthesize the magnetite nanoparticles (MNPs). In order to fine-tune the synthesized MNPs for the collection of heavy crude oil spills, the particles’ surface was modified with green hydrophobic biocomponents that were extracted from Anthemis pseudocotula (AP). The surface modified reaction carried with that of the MNPs in the presence of n-hexane extract (APH) resulted in the formation of APH-MNPs, while in the presence of chloroform extract (APC), resulted in APC-MNPs formation. The as-formed MNPs were thoroughly characterized using transmittance electron microscopy, X-ray powder diffraction, vibrating sample magnetometer and thermogravimetric analysis. The efficiency of the surface-modified MNPs for the collection of oil spills in the presence of an external magnetic field was evaluated by taking different ratios of MNPs:crude oil. From the analysis of the results, we found that the APH-MNPs particles have higher efficiency in the collection of heavy crude oil than the corresponding APC-MNPs.