The removal of arsenic from water using natural iron oxide minerals

Aredes, Sonia; Klein, Bern; Pawlik, Marek

doi:10.1016/j.jclepro.2012.10.035

Cited by 127 publications

(56 citation statements)

References 6 publications

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“…Recently, iron mineral samples, goethite, magnetite, hematite and laterite were used as simple, affordable and readily available materials for household removal of arsenic from drinking water. 25 The showed good performance to remove As(V) from water using very high adsorbent dosages which creates the problem of a large waste for disposal. However, there are some problems with these methods because of their scalability, high-cost, sustainability and large environmental footprints as they use toxic materials and lead to the generation of toxic chemical waste.…”

Section: Introductionmentioning

confidence: 99%

Bacterial iron-oxide nanowires from biofilm waste as a new adsorbent for the removal of arsenic from water

et al. 2017

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Biofilm, generated by the bacteria in the groundwater pumping system pipelines of the Salt Interception Scheme on the River Murray in South Australia is discarded as a waste material accumulated after periodic cleaning of the pipes. Structural and chemical composition characterizations confirm that this waste material is composed of amorphous twisted iron-oxide nanowires (ION), generated by bacteria, and they have a unique structure and properties. The adsorption performance of these iron-oxide nanowires for arsenic removal from water was evaluated to define their adsorption capacity for As(III) andAs(V) and kinetics. Obtained results demonstrate considerable adsorption properties of this waste biological material and suggest its promising application as a new and low-cost adsorbent for water treatment.

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Section: Introductionmentioning

confidence: 99%

Bacterial iron-oxide nanowires from biofilm waste as a new adsorbent for the removal of arsenic from water

et al. 2017

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“…These methods include chemical precipitation, coagulation and electrocoagulation [6] ion exchange [7,8], membrane process [9], and adsorption techniques [10]. However, most of the removal techniques whether conventional or advanced suffer from different shortcomings especially in the developing globe.…”

Section: Introductionmentioning

confidence: 99%

Defluoridation of Water Using Natural and Activated Coal

Regassa¹,

Melak²,

Birke³

et al. 2016

International Advanced Research Journal in Science, Engineering

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High fluoride concentration is a worldwide problem in drinking water due its health effects. Batch mode investigation to remove fluoride from aqueous solution and real groundwater samples by natural coal and its modified forms was made. The physicochemical analysis of adsorbents and their activation was overseen to well understand the mechanism of sorption. Adsorption was found to be pH dependent with optimal removal efficiency at pH 2 for physically and chemically activated coal and at pH 4 for natural coal (NC). The experimental data was well fitted with Langmuir and Freundlich adsorption model providing maximum adsorption capacity of 5.9, 8.36 and 11.35 mg/g for natural, physical and chemical activated coal in their order written from Langmuir model. The Dubinin-Radushkevich isotherm (R 2 = 0.988) with mean free energy (E = 0.085 KJ/mol) for natural coal signify physiosorption should be mainly responsible for fluoride adsorption. The applicability of the adsorbents from fluoride contaminated groundwater indicated that natural coal (NC), physically activated coal (PAC) and chemically activated coal (CAC) can be used as an effective, low-cost adsorbent to remove fluoride from groundwater. The buffering capacity of adsorbents monitored during sorption induces a pH increase to nearly neutral, after sorption, which may be an important asset in real applications.

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“…Hydrated oxides of iron are particularly important in the latter cases, which occur very widely as colloidal materials in natural waters or as coatings on the surfaces of detrital minerals [11,12]. Goethite is the most common iron (hydro) oxide in soils, and have good adsorption capacity for both As(V) and Cd, therefore have already been used widely to remove such toxic materials in water treatment [13,14].…”

Section: Introductionmentioning

confidence: 99%