This study aims to prepare the sodium bentonite (Bent-Na) and the iron-pillared bentonite (PILC-Fe) and to evaluate its adsorption efficacy against Coomassie blue from aqueous solution. Results demonstrated that the PILC-Fe sample presents an increase in the basal distance d 001 from 13.66 to 16.93 Å. The presence of the Fe-O and FeOOH functional group band on PILC-Fe was confirmed by FTIR analysis. A clear increase has been observed of the specific surface area from 45.86 to 125.30 m 2 /g for Bent-Raw and PILC-Fe, respectively, and this increase is greater than 63%. Adsorption of CBB dye into Bent-Na and PILC-Fe was fast, and their adsorption equilibriums were reached within 15 and 5 min, respectively. The maximum adsorption capacity for CBB dye is 9.125 mg/g for PILC-Fe, whereas Bent-Na presents a lower adsorption capacity of around 6.848 mg/g. The maximum CBB dye adsorption rate was attained at pH 4.68 for both bentonites. It is observed a difference in the removal efficiency implying that the adsorption of CBB molecule dye was affected by the structure and functional groups of dyes. It is noticed that the adsorption process for CBB dye into Bent-Na and PILC-Fe was better fitted with the linear * A. Ramdani
Corrosion inhibition of mild steel in hydrochloride acid solution was performed by a two pyrazole carboxamides named 5-(4-(dimethylamino)phenyl)-3-phenyl-4,5-dihydro-1H-pyrazole-1-carboxamide DPC-1 and (E)-5-(4-(dimethylamino)phenyl)-3-(4-(dimethylamino)styryl)-4,5-dihydro-1H-pyrazole-1-carboxamide DPC-2 using weight loss measurements, Tafel polarization curves and electrochemical impedance spectroscopies (EIS). The obtained results show that DPC-1 and DPC-2 are effective corrosion inhibitors in 1 mol l−1 HCl solution. The inhibition efficiency η (%) increases with the increase of inhibitors concentration to reach 84.56% at 4 × 10−4 mol l−1 and 80% at 1.6 × 10−4 mol l−1 for DPC-1 and DPC-2 at 303 K, respectively. The adsorption of synthesized pyrazoles on MS surface obeys the Langmuir adsorption isotherm. Tafel polarization curves reveal that DPC-1 and DPC-2 acts as a mixed-type inhibitor and EIS spectra show the increase of the transfer resistance with the inhibitors concentration. The SEM surface analysis shows the formation of protective organic film on steel surface. The relationship between the inhibition performance of pyrazoles and their structural parameters was investigated using DFT calculations.
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