Valorisation and Modification of Saharan Clay for Removal of Cu(II), Ni(II), Co(II) and Cd(II) from Aqueous Solutions

Abstract

The organosilane-modified Saharan kaolin (KS) was prepared and tested as an adsorbent for Cu(II), Ni(II), Co(II) and Cd(II) removal from aqueous solution in comparison with original Saharan kaolin (K). Characterization of modified clay material and original clay was carried out by different methods (XRD, FTIR, TGA and SEM) in order to establish the link between synthesis, structures and properties. The hydrophilic properties of the clay surface have been modified, but not turned into hydrophobic ones. The graft has indeed a polar amine group and the chain length is too short to present an important hydrophobic character. The adsorption of heavy metal ions onto APTES-modified kaolin showed greater efficiency than original kaolin. The adsorption of metal ions by the original kaolin is dominated by the cation exchange phenomenon with a preferential order of selectivity: Cu(II)>Ni(II)>Co(II)>Cd(II), while adsorption on KS is mainly dominated by attraction of the chelating group of the amine in the same order of selectivity. This new hybrid organic-inorganic material may be a good alternative for separation and preconcentration of heavy metal ions.

Impacts of kaolinite enrichment on biochar and hydrochar characterization, stability, toxicity, and maize germination and growth

“…In the XRD pattern of kaolinite deposits, the strongest intense peaks of kaolinite in XRD pattern of kaolinite deposits were identified at 2θ = 12.46°; 25.06° and 26.68° (Fig. 1 a) 62 – 64 and lower diffraction kaolinite peaks than previous peaks were revealed at 2θ = 36.7°; 39.50°; 42.56°; 50.3°; 55.16° and 62.4° 65 – 70 . Four peaks of cellulose in BM are displayed at = 21.8; 22.4°; 24.3° and 30°, peak of carbon-containing minerals mellite is at 2θ = 14.8°, and calcite at 2θ = 39.78° (Fig.…”

Removal performance for thermotolerant coliforms and fecal streptococci from dairy effluents by Kenadsa’s natural green clay (Bechar-Algeria) in a fixed-bed column

“…The processes implemented in conventional facilities, which aim to reduce the pollutant load until reaching an acceptable level to the receiving medium, are generally costly and consist of mechanical, biological, or physicochemical methods, such as adsorption, precipitation, electrolysis, ion exchange, clotting or oxidation, and flocculation processes (Rodier 2009). Among these methods, adsorption is recognized as one of the most widely used methods in the world due to its effectiveness, and also to be an economical method to remove or even to reduce the concentration of metal ions or pollutants in general from surface waters/wastewater (Unuabonah et al 2018;Meroufel et al 2020). Adsorption is a process of material transfer between a liquid (or gaseous) phase loaded into an organic or an inorganic compound and a solid phase adsorbent.…”

Study on Cr₂O₃/γ-Al₂O₃ Catalysts for Mixed Pyrolysis of Coal to Produce Hydrogen-Rich Fuel Gas

“…There are many kinds of active components in catalysts. The selection of metal oxides is mainly in alkali metal oxides [14], alkaline earth metal oxides [15], by-group metal oxides [16] and the eighth group metal oxides [17]. Metal oxides are widely used as active components of catalysts, and have directional control effect on coal pyrolysis products.…”