Adsorption of uranium and thorium on new adsorbent prepared from Moroccan oil shale impregnated with phosphoric acid

Abstract

Attention has been focused recently on the production of new adsorbents from Moroccan oil shale of Tarfaya (layer R3) by chemical activation with phosphoric acid and its application in wastewaters treatment. The optimal conditions for the preparation were searched and the tests of adsorption of uranium and thorium ions were affected. The best product was obtained by used of the ratio of activated agent/precursor equal 3 and activation of the mixture in air at 250°C during two hours after prepocessing at 120°C in air. Under these conditions the maximal adsorption capacity of methylene blue and specific area (S BET) of the new adsorbent were 526 mg/g and 630 m 2 /g, respectively. A batch mode experiment was used to explore the performances of this adsorbent for the removal of the U and Th from aqueous solutions prepared from UO 2 (NO 3) 2 .6H 2 O and Th(NO 3) 4 .5H 2 O. The adsorption parameters for the two radioelements were determined by application of the Langmuir, Freundlich and Elovich models.

Application of response surface methodology for thorium adsorption on PVA/Fe3O4/SiO2/APTES nanohybrid adsorbent

“…PVA/TiO 2 /TMPTMS 238.1 [11] Aspergillus fumigatus 370.0 [28] Aspergillus niger 22.0 [29] Aspergillus terus 60.0 [29] Penicillium chrysogenum 142.0 [29] Rhizopus arrhizus 185.0 [29] Saccharomyces cerevisiae 119.0 [30] Calcined diatomite 121.2 [31] Flux calcined diatomite 116.6 [31] Carboxylate-functionalised graft copolymer derived from titanium dioxide-densified cellulose 92.2 [32] Crystalline tin oxide nanoparticles 62.5 [33] Moroccan oil shale impregnated with phosphoric acid 454.0 [34] Magnetic chitosan composite particles 312.5 [35] Pseudomonas biomass 476.2 [36] Activated carbon 21.3 [37] Poly(methacrylic acid) -grafted composite/bentonite 110.5 [38] P(4-vinyl pyridine) hydrogel 120.5 [39] P(4-vinyl pyridine)-co-2-hydroxyethylmetacrylate 64.9 [39] Cystoseira indica 169.5 [ A c c e p t e d M a n u s c r i p t …”

A Fungal Modified Material With High Uranium (VI) Absorption Capacity And Strong Anti-Interference Ability

“…For the treatment of heavy metal wastewater pollution, many chemical synthesized materials (Wang et al 2016;Jin et al 2016; Zhang et al 2015) and natural biomass (Huo et al 2020; Torres 2020) were used as the absorbents. It was well known that amidoxime group could be as electron donor to coordinate with uranyl ion, and the functionalized amidoxime acquisition had performed well in uranium (VI) recovery (Khouya 2010;Sun et al 2018; Kelley et al 2014;Vukovic et al 2012) According to the Hard-Soft-Acid-Base theory (Ritter 2003), UO 2 2+ usually belongs to the hard acid and has the better coordination ability with hard base ligands, and the majority of them reported in the previous literatures were like esters containing N and O atoms with some lone pair electrons, which had good chelate properties for metal ions (Gromova et al 2021).…”

Mineral Oil Shale Part Based-Support as Heterogeneous Catalyst for Organophosphorus Synthesis Assisted by Ultrasounds

“…Since then, this reaction got the attention of chemists, a numerous of different catalysts were used to obtain the α-hydroxyphosphonates such as guanidine hydrochloride 18 , Amberlyst-15 19 , natural phosphate 20 On the other hand, Oil shale raw matter is considered as an energy source by conversion this matter to energy and chemical products through the thermochemical conversion technology 29 . A number of environmental alternatives have also been developed using Moroccan oil shale as adsorbent material to remove industrial dyes, heavy metals, and radioactive elements [29][30][31][32][33][34][35][36] .…”