New adsorbents from oil shales: Preparation, characterization and U, Th isotope adsorption tests

Khouya, El Hassane; Fakhi, S.; Hannache, Hassan; Abbé, J.Ch.; Andrès, Yves; Naslain, R.; Pailler, R.; Nourredine, A.

doi:10.1023/b:jrnc.0000027075.26040.95

Cited by 8 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, the adsorption ratio, R (%), is close to 100 % for 2g of mass of sample. Previous works have explained this experimental result by the role of organic matter integrated in the mineral part of sample (Khouya et al, 2004).…”

Section: Test Of Adsorption Of 134 Cssupporting

confidence: 53%

Adsorption of methylene blue on bituminous schists from Tarfaya-Boujdour

Int¹

2019

Preprint

View full text Add to dashboard Cite

In this work, the reactivity of the surface of bituminous schists has been studied using a cation adsorbent, so-called Methylene Blue (MB). This bituminous schist is a calcareous clay rock that contains some amounts of organic matter. The samples were collected from an outcrop of Lamsied (Laâyoune), zone around Tarfaya-Boujdour. Once the granulometry of samples was well determined, the rocks were characterized by X-ray diffraction and they were analysed by X-ray fluorescence. Some parameters were considered relevant on the adsorption of MB by surface rock and they have been studied. One of these parameters is the adsorbed molecules-adsorbent contact time. This is the contact between a starting concentration of MB and a certain mass of gross rock. The analysis of results has shown that adsorption of MB can be well modelled by the Langmuir isotherm and also that a rapid kinetic (<100 min for L-type) can be fitted by a second-order equation model. The gross rock takes 84 % of the amount of MB in aqueous phase at a time less than 1min, using a rock mass of 0.1 g.

show abstract

Section: Test Of Adsorption Of 134 Cssupporting

confidence: 53%

Adsorption of methylene blue on bituminous schists from Tarfaya-Boujdour

Int¹

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…The choice of this material was suggested by its composition, as it contains a large amount of organic matter chemically linked to a mineral matrix. (Khouya et al, 2004). It has proved to possess good capacities for removing certain organic substances, heavy metals and bacteria (Oumam et al, 2002) from wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Distribution of naturally occurring radionuclides (U, Th) in Timahdit black shale (Morocco)

Galindo

Mougin

Fakhi

et al. 2007

Journal of Environmental Radioactivity

Self Cite

View full text Add to dashboard Cite

Attention has been focused recently on the use of Moroccan black oil shale as the raw material for production of a new type of adsorbent and its application to U and Th removal from contaminated wastewaters. The purpose of the present work is to provide a better understanding of the composition and structure of this shale and to determine its natural content in uranium and thorium. A black shale collected from Timahdit (Morocco) was analyzed by powder X-ray diffraction and SEM techniques. It was found that calcite, dolomite, quartz and clays constitute the main composition of the inorganic matrix. Pyrite crystals are also present. A selective leaching procedure, followed by radiochemical purification and alpha-counting, was performed to assess the distribution of naturally occurring radionuclides. Leaching results indicate that 238U, 235U, 234U, 232Th, 230Th and 228Th have multiple modes of occurrence in the shale. U is interpreted to have been concentrated under anaerobic conditions. An integrated isotopic approach showed the preferential mobilization of uranium carried by humic acids to carbonate and apatite phases. Th is partitioned between silicate minerals and pyrite.

show abstract

“…The raw material used in this work is Moroccan oil shale of Tarfaya (layer R3). This material is composed from the organic matter chemically linked to the mineral matter essentially formed by calcite, dolomite, silicate and clays (table 1) [13][14][15].…”

Section: Preparation Of the Precursormentioning

confidence: 99%

“…The precursor R3H, a particle size of 80-100µm in diameter, was mixed with the phosphoric acid at 80%, with a weight ratio H 3 PO 4 /precursor = 3. The choice of the activating agent and the weight ratio was dictated by results obtained after many studies trials in the laboratory and according to our previous studies [13][14][15]. The activation experiments were performed under various conditions to obtain the optimal condition for activation.…”

Section: Table 1: Mineralogical Composition Of the Tarfaya Oil Shalementioning

confidence: 99%

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

Khouya

Legrouri²,

Fakhi

et al. 2010

Nat Prec

View full text Add to dashboard Cite

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.

show abstract

New adsorbents from oil shales: Preparation, characterization and U, Th isotope adsorption tests

Cited by 8 publications

References 13 publications

Adsorption of methylene blue on bituminous schists from Tarfaya-Boujdour

Adsorption of methylene blue on bituminous schists from Tarfaya-Boujdour

Distribution of naturally occurring radionuclides (U, Th) in Timahdit black shale (Morocco)

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

Contact Info

Product

Resources

About