Performances of metals modified activated carbons for fluoride removal from aqueous solutions

Bakhta, Soumia; Sadaoui, Zahra; Lassi, Ulla; Romar, Henrik; Kupila, Riikka; Vieillard, Julien

doi:10.1016/j.cplett.2020.137705

Cited by 29 publications

(8 citation statements)

References 40 publications

(2 reference statements)

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“…Activated carbon was produced from date stems as waste biomass. It was prepared according to a previously reported method [47]. The sample was left in contact with the aqueous ZnCl 2 solution (activating agent/raw material 2:1, w:w) at 70 • C for 4 h for chemical activation, under magnetic stirring, and then dried at 105 • C for 24 h. Then, the waste biomass was pyrolyzed at 600 • C in a muffle furnace for 1 h. After cooling, the sample was washed many times with hydrochloric acid solution (0.1 mol/L) and distilled water to eliminate activating agent residues and other inorganic species formed during the process.…”

Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

TBO Degradation by Heterogeneous Fenton-like Reaction Using Fe Supported over Activated Carbon

et al. 2021

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This study reports on the synthesis, immobilization, and stabilization of iron (Fe) particles in activated carbon (AC) from date stem material for the heterogeneous Fenton-like removal of hazardous pollutants from water. AC-Fe was synthesized through a simple and sustainable chemical reaction using and resulting in an environmentally friendly material (AC-Fe). X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray analyses (EDX) were used to characterize the synthesized samples. XRD, FTIR and XPS results showed the successful incorporation of iron particles onto AC. SEM images indicated smooth surfaces with clearly visible Fe particles. Compared to pure AC, AC-Fe showed higher degradation rates of toluidine blue O (TBO) dye. The effects of the initial pH and TBO and H2O2 concentrations on TBO degradation were investigated. The AC-Fe catalyst proved highly efficient in the Fenton-like degradation of TBO (50 ppm), with the removal of up to 99% in 3 min. This catalyst was used efficiently for up to four repeated cycles. The improved catalytic activity of AC-Fe was related to Fe particles for the generation of HO•. These results prove that date stems—a waste product from agriculture—are a suitable precursor for preparing an appropriate AC and catalyst and for eliminating dyes from an aqueous solution by a heterogeneous Fenton-like reaction. The above results open an interesting avenue for the development of functional green catalysts based on AC-Fe for pollution removal.

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Section: Catalyst Preparation and Characterizationmentioning

confidence: 99%

TBO Degradation by Heterogeneous Fenton-like Reaction Using Fe Supported over Activated Carbon

et al. 2021

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“…Adsorption may be the most promising approach because of the high availability of adsorbents (natural and synthetic), the simplicity of the operational design and its reasonable cost [7]. Different materials have been tested as fluoride adsorbent, i.e., silica nano modified from rice husk [8], montmorillonite-clay [9], poly otoluidine modified lanthanum phosphate [10], bone char derived from bone residue [11] and aluminummodified activated carbon from dates stems [12], etc.…”

Section: Introductionmentioning

confidence: 99%

Dealuminated heated clay as new fluoride adsorbent for treatment of contaminated drinking water

Charbti¹,

Fortin²,

Mezni³

et al. 2022

Comptes Rendus. Chimie

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The present study aims to reduce the fluoride concentration of drinking water using a novel mild adsorbent based natural clay. The natural clay was dealuminated/realuminated and dehydroxylated by intense washing and heating processes. The developed adsorbent was confirmed by X-ray diffraction (XRD), thermal analyses (ATD-TG) and nuclear magnetic resonance solid-state with magic angle spinning (MAS NMR). MAS NMR results showed that distorted tetrahedral-Al coordination and penta-Al coordination sites were responsible for fluoride adsorption. Batch adsorption experiments were investigated without any adjustment of water pH. The effect of the clay dosage over the range of 0.5-2 g/50 mL of sample solution was studied. Results revealed that the aggregation of the clay particles in the water was successfully avoided thanks to the heating process. Kinetics and adsorption isotherms were also investigated. The adsorption equilibrium was achieved on a timescale of seconds. Adsorption kinetics data followed pseudo-first-order as well as pseudo-second-order models while isotherm experimental data followed the Freundlich model. The maximum adsorption capacity was relatively small (1.2 mg•g −1 ). Tests performed on Tunisian contaminated drinking water showed that water potability with respect to fluoride was successfully achieved; suggesting that the dealuminated/realuminated dehydroxylated clay can be a promising fluoride adsorbent for drinking water.

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“…Ammonia removal involved ion exchange, whereas nitrate removal implied hydrogen bonding and electrostatic bonding (Scheme 8). The chemical functionalization of an INAD using aluminum-loaded activated carbon with grafting of the APTES for fluoride removal was studied by Bakhta et al [103] and the sorption capacity of fluoride onto the functionalized INAD reached 92.0 mg g −1 . Fotsing et al [104] prepared cocoa shell biomass via chemical grafting of APTES and PEI.…”

Section: Removal Of Heavy Metals and Nitratesmentioning

confidence: 99%

Advances in Amine-Surface Functionalization of Inorganic Adsorbents for Water Treatment and Antimicrobial Activities: A Review

2022

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In the last decade, adsorption has exhibited promising and effective outcomes as a treatment technique for wastewater contaminated with many types of pollutants such as heavy metals, dyes, pharmaceuticals, and bacteria. To achieve such effectiveness, a number of potential adsorbents have been synthesized and applied for water remediation and antimicrobial activities. Among these inorganic adsorbents (INAD), activated carbon, silica, metal oxide, metal nanoparticles, metal–organic fibers, and graphene oxide have been evaluated. In recent years, significant efforts have been made in the development of highly efficient adsorbent materials for gas and liquid phases. For gas capture and water decontamination, the most popular and known functionalization strategy is the chemical grafting of amine, due to its low cost, ecofriendliness, and effectiveness. In this context, various amines such as 3-aminopropyltriethoxysilane (APTES), diethanolamine (DEA), dendrimer-based polyamidoamine (PAMAM), branched polyethyleneimine (PEI), and others are employed for the surface modification of INADs to constitute a large panel of resource and low-cost materials usable as an alternative to conventional treatments aimed at removing organic and inorganic pollutants and pathogenic bacteria. Amine-grafted INAD has long been considered as a promising approach for the adsorption of both inorganic and organic pollutants. The goal of this review is to provide an overview of surface modifications through amine grafting and their adsorption behavior under diverse conditions. Amine grafting strategies are investigated in terms of the effects of the solvent, temperature, and the concentration precursor. The literature survey presented in this work provides evidence of the significant potential of amine-grafted INAD to remove not only various contaminants separately from polluted water, but also to remove pollutant mixtures and bacteria.

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Performances of metals modified activated carbons for fluoride removal from aqueous solutions

Cited by 29 publications

References 40 publications

TBO Degradation by Heterogeneous Fenton-like Reaction Using Fe Supported over Activated Carbon

TBO Degradation by Heterogeneous Fenton-like Reaction Using Fe Supported over Activated Carbon

Dealuminated heated clay as new fluoride adsorbent for treatment of contaminated drinking water

Advances in Amine-Surface Functionalization of Inorganic Adsorbents for Water Treatment and Antimicrobial Activities: A Review

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