Adsorption study using optimised 3D organised mesoporous silica coated with Fe and Al oxides for specific As(III) and As(V) removal from contaminated synthetic groundwater

Abstract

International audienceThis work presents the possibility of optimising 3D organised mesoporous silica (OMS) coated with both iron and aluminium oxides for the optimal removal of As(III) and As(V) from synthetic contaminated water. The materials developed were fully characterised and were tested for removing arsenic in batch experiments. The effect of total Al to Fe oxides coating on the selective removal of As(III) and As(V) was studied. It was shown that 8% metal coating was the optimal configuration for the coated OMS materials in.removing arsenic. The effect of arsenic initial concentration and pH, kinetics and diffusion mechanisms was studied, modelled and discussed. It was shown that the advantage of an organised material over an un-structured sorbent was very limited in terms of kinetic and diffusion under the experimental conditions. It was shown that physisorption was the main adsorption process involved in As removal by the coated OMS. Maximum adsorption capacity of 55 mg As(V) g(-1) was noticed at pH 5 for material coated with 8% Al oxides while 35 mg As(V) g(-1) was removed at pH 4 for equivalent material coated with Fe oxides. (C) 2014 Elsevier Inc. All rights reserved

Surfactant‐Free One‐Pot Synthesis of Low‐Density Cerium Oxide Nanoparticles for Adsorptive Removal of Arsenic Species

“…Monolayer adsorption capacity, Q m , for As(III) was found to be 71.94 mg g 21 , which was almost the double of As(V) (36.8 mg g 21 ). The value of Langmuir constant, b, was found lower for As(III) than As(V), the similar observation has also been reported by Yoann et al (2014) [28]. Weber et al (1974) calculated the essential characteristics of Langmuir isotherms in terms of separation factor (R L ) using the following equation [29].…”

Nanocomposite functionalized membranes based on silica nanoparticles cross-linked to electrospun nanofibrous support for arsenic(v) adsorption from contaminated underground water

“…In this work, adsorption curves tted with Weber and Morris model (see ESI 2 †) do not follow a linear behavior suggesting that the intraparticle diffusion is not the dominant process determining the kinetics of the adsorption process. 29 Experimental data exhibit three linear zones suggesting that the overall adsorption process may indeed be controlled either by one or more steps, or a combination of steps. It is assumed that the rst linear portion (zone 1) represents the diffusion process of mass transfer onto the adsorbent surface.…”

“…14 Adsorbents such as carbon nanospheres, 15 metal oxide nanoparticles, [16][17][18][19] carbon nanotubes (CNTs), [20][21][22] Fe species such as Fe, Fe 2 O 3 , Fe 3 O 4 (ref. [23][24][25][26] and mesoporous silica nanoparticles 23,[27][28][29] have been employed to remove arsenic from contaminated water.…”

Removal of noxious dye—Acid Orange 7 from aqueous solution using natural pumice and Fe-coated pumice stone

“…Equilibrium and kinetic adsorption parameters were obtained from the application of mathematical models to the experimental data. The maximum adsorption capacity of different Fe coated adsorbents [30][31][32] are presented in Table 1.…”