Abstract
Novel low-cost bark-based magnetic iron oxide particles (BMIOPs) were synthesized and investigated for the removal of As(III) in drinking water. The synthesized BMIOP had a saturation magnetization value of 38.62 emug−1 which was found to be enough for the magnetic separation of exhausted BMIOP after As(III) adsorption. Parameters like agitation speed, adsorbent dosage, contact time, pH, temperature, and initial concentration were thoroughly investigated. Langmuir, Freundlich, and Dubinin–Radushkevich isotherms were used for the modeling of experiments and observed a maximum adsorption (19.61 mg g−1) of As(III) by Langmuir isotherm. Kinetics of As(III) sorption were well correlated with the coefficients in pseudo-first-order than the pseudo-second-order rate equation. Thermodynamic parameter investigation revealed that As(III) sorption process is endothermic, feasible, and spontaneous. BMIOP emerged as less expensive adsorbent for the abatement of arsenic ion from the drinking water. BMIOP showed 13.58 mg g−1 adsorption capacity when As(V) alone is present, while it is 9.43 and 7.04 mg g−1 for As(V) and As(III), respectively, when present together in the water.
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Acknowledgements
We thank Director, CSIR-NERRI Nagpur for providing facilities to carry out the research work. Dr. M. Pratap Reddy thanks CSIR, New Delhi, in granting the Pool Scientist (SRAship) award. We thankfully acknowledge Sophisticated Analytical Instrument facilities, IIT Chennai for VSM test. We also thankfully acknowledge Dr. K. R. Patil, Scientist from Center for Materials characterization, National Chemical Laboratory, for X-ray Photoelectron Spectroscopy.
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Highlights
• Batch study was performed on BMIOP to remove As(III) from water.
• BMIOP has magnetic property (38.62 emug−1), easily removed by conventional magnet.
• BMIOP has adsorption capacity of 19.61 mg g−1.
• Adsorption capacity of BMIOP is more than reported adsorbents.
• Drinking water quality parameters were satisfied after treatment with BMIOP.
Novelty statement
BMIOP is prepared by template method, which has potential to remove As(III) from water having pH (6.5–8.5). After treatment, it also fulfills the requirement of drinking water parameters. BMIOP has significant magnetic property (38.62 emug−1) to remove arsenic loaded or exhausted BMIOP without touching to it from water by conventional magnet. BMIOP has 19.61 mg g−1 adsorption capacity, which is significantly higher than many reported adsorbents for the concentration of 1.0 mg L−1 of As(III). BMIOP also has capacity to remove As(V) alone and together with As(III) from water. It has regeneration property with 1% of NaOH.
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Dhoble, R.M., Maddigapu, P.R., Bhole, A.G. et al. Development of bark-based magnetic iron oxide particle (BMIOP), a bio-adsorbent for removal of arsenic (III) from water. Environ Sci Pollut Res 25, 19657–19674 (2018). https://doi.org/10.1007/s11356-018-1792-x
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DOI: https://doi.org/10.1007/s11356-018-1792-x