nophosphonic groups to sorb rare earth elements. • XPS, FTIR and molecular modeling were applied for characterizing metal binding. • Sorption isotherms and uptake kinetics are modeled for La(III) and Y (III) recovery. • Metal desorption and sorbent recycling are highly efficients. • The treatment of monazite leachate is discussed in terms of affinity for REEs.

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The heterogeneous photocatalytic desulfurization processes have been paid wide attention due to their effectiveness in removing the condensed organo-sulfur compounds. Such methods may gain greater consideration via utilizing the visible light in general and sun spectrum in particular. This research work aims to produce low sulfur diesel fuel through a catalyzed photochemical route using nanoparticles of CdO under the visible-light irradiation. Two various structures of CdO were prepared in this study by both the chemical precipitation and autoignition techniques. The structural and morphological characteristics of the obtained cadmium oxides were determined via different tools of analyzes. The production of a low sulfur diesel fuel was then investigated under various operating parameters, such as type of light source, catalyst-to-feed dosage, and reaction time. The effect of adding oxidizing agents at different concentrations on the desulfurization process was also studied. After the maximum sulfur removal had been detected under the optimum conditions, the ultimate removal of sulfur was attained through a subsequent solvent extraction step. A diesel fuel with a sulfur content of 45 ppm was acquired at the end of this research study. A total sulfur removal of 99.6 wt % was obtained because the original diesel fuel feedstock has an overall concentration of the sulfur compounds of 11 500 ppm.

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The article states the first preparation of NiMo layered double hydroxide (LDH) adsorbent for the removal of dibenzothiophene (DBT) form n-heptane solution and desulfurization of gas oil. The existence of (Mo 6+ ) in Ni 2+ Mo 6+ LDH was proven by X-ray photoelectron spectroscopy (XPS), while X-ray diffraction and X-ray fluorescence patterns, Fourier transform infrared spectra, scanning electron microscopy images, and differential scanning calorimetry− thermogravimetric analysis and Brunauer−Emmett−Teller analysis were applied for the composition and surface characterizations. Experimentally, NiMo LDH exhibited a different conduct in the adsorption elimination of sulfur in the existence of aromatics; the sulfur uptake was increased with the increase of the aromatic content in accordance with its own highly charged surface as a result of the formation of +4 balancing charges between Ni 2+ and Mo 6+ through the brucite layers. The material achieved adsorption capacity of 48.8 mg g −1 sulfur for DBT at 25 °C follows a pseudo-second-order kinetic type and Langmuir isotherm. NiMo LDH adsorbent showed a remarked desulfurization of gas oil by 79.6%, although it has a high aromatic content (33%). A π-complexation between the Ssulfur atoms and Mo 6+ was proposed through surface adsorption. The material conserved its parental structure and adsorptive activity after being regenerated seven times.