Details

Autor(en) / Beteiligte

• Gerard, Neeraj
• Santhana Krishnan, Raghunandan
• Ponnusamy, Senthil Kumar
• Cabana, Hubert
• Vaidyanathan, Vinoth Kumar

Titel

Adsorptive potential of dispersible chitosan coated iron-oxide nanocomposites toward the elimination of arsenic from aqueous solution

Ist Teil von

• Process safety and environmental protection, 2016-11, Vol.104, p.185-195

Ort / Verlag

Rugby: Elsevier B.V

Erscheinungsjahr

2016

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •High potential magnetic nanosorbent for sequestration of As(III) was developed.•Direct removal of more toxic As(III) species without oxidizing it to As(V).•Adsorption capacity of CIN using Langmuir isotherm was found to be 267.2mg/g.•Only a meagre loss of 13% over its initial adsorptive potential after 5 cycles. The present study investigates elimination of the arsenic [As(III)] spiked in water via adsorption using chitosan coated iron-oxide nanocomposites (CINs) as a robust adsorbent. The synthesized adsorbent exploits the magnetic nature of iron oxide for the separation of saturated CINs from the aqueous solution upon completion of treatment process. The optimum conditions for adsorption of As (III) using CINs were found to be pH 6.0, adsorbent dosage of 2.0g/L and contact time of 30min. The maximum monolayer adsorption capacity (qm) calculated using Langmuir model was found to be 267.2mg of As(III) per gram of CINs. The separation factor (RL) was found to lie within 0–1, predicting that the adsorption of As(III) onto CINs is a reversible process. Based on the calculated heterogeneity parameter from Freundlich isotherm (n=2.236), the process is highly favorable physisorption while the kinetics of the process was best explained by pseudo-second order rate equation. The regeneration of the saturated CINs could be performed using a simple acid–base treatment using 0.1N HCl and NaOH. Upon recycling the adsorbent for 5 batches of repeated adsorption studies, only a meagre 13% loss over its initial adsorption capacity was observed.