Adsorption Behavior of Fe(II) and Fe(III) Ions on Polyaniline Coated Sawdust: Batch and Fixed–Bed Studies

Seyed Jamaledin Mansoor,Fatemeh Abbasitabar

doi:10.17344/acsi.2019.5121

Seyed Jamaledin Mansoor, Fatemeh Abbasitabar

Open Access

https://doi.org/10.17344/acsi.2019.5121

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Abstract

The aim of this study is to investigate the suitability of polyaniline coated-sawdust (SD/PAni) as an adsorbent for removal of Fe(II) and/or Fe(III) ions from aqueous solutions. The study includes batch and column tests. With column experiments, the influence of different experimental parameters on the adsorption behavior of Fe(II), Fe(III), and a mixture of both ions were studied and it was found that the optimum adsorption conditions for individual iron species and a mixture of them were similar. The optimal values for pH, flow rate, temperature, and adsorbent mesh size were found to be 4.0, 5.0 mL min-1, 25 °C, and 100 BSS mesh, respectively. Batch experiments were carried out to study the adsorption isotherms at ambient temperature. The results demonstrated that the adsorption isotherms for both iron species were best represented by the multilayer adsorption isotherm model. The adsorption-desorption stability performance of the adsorbent was evaluated and confirmed over 5 cycles.

Highlights

Water pollution by heavy metals remains a serious environmental problem
One of the most widely researched topics in environmental science which requires extensive study is the removal of heavy metals from aqueous solutions.[1]
World Health Organization (WHO) recommends that the iron concentration in drinking water should be less than 0.3 mg L−1.5,6 In anaerobic groundwaters, concentration of iron(II) is usually in the range of 0.5–10 mg L−1, but concentrations up to 50 mg L−1 are reported

Summary

Introduction

Water pollution by heavy metals remains a serious environmental problem. Their accumulation in numerous plant and animal organisms occurs . One of the most widely researched topics in environmental science which requires extensive study is the removal of heavy metals from aqueous solutions.[1] Iron is a nutrient element required by living cells.[2,3] Estimates of the minimum daily requirement for iron depend on sex, age, physiological status, and iron bioavailability, and is approximately 10 to 50 mg/day.[4] Presence of high levels of iron in drinking water is associated with some problems such as bad taste, discoloration, and high turbidity. Removal of iron species from aqueous media to allowable global limits is essential and has led to an increasing interest in developing efficient methods for this purpose.[8,9,10,11]

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