Synthesised CM-β-CD-Fe₃O₄NPs: as an environmental friendly and effective adsorbent for elimination of boron from aqueous solutions

ABSTRACT

This in study, the applicability of CM-β-CD-Fe₃O₄NPs synthesis for eliminating boron from aqueous solutions. Identical techniques including BET, FT-IR, XRD and SEM has been utilised to characterise this novel material. The maximum adsorption efficiency of boron onto CM-β-CD-Fe₃O₄NPs was 98.0%, at optimum values of the pH, adsorbent dosage, boron concentration, and contact time were found to be 5, 0.3 g, 50 mg/L, and 60 min for boron onto CM-β-CD-Fe₃O₄NPs sorbent, respectively. The experimental equilibrium data was fitted to the conventional isotherm models and accordingly Langmuir isotherm has good applicability for the explanation of experimental data with maximum adsorption capacity (q_max) of the boron onto CM-β-CD-Fe₃O₄NPs were roughly 3.98 mgg⁻¹ respectively. Kinetics experiments were performed to investigate the adsorption kinetics, the pseudo- second-order kinetic coincided quite with the kinetic results. The Thermodynamic parameters of free energy (ΔG⁰), enthalpy (ΔH⁰) and entropy (ΔS⁰) of adsorption were determined using isotherms. ∆G⁰ = −6755.5 J/mol, ∆H⁰ = −80.86 J/mol and ∆S⁰ = −250.517 J/mol. K. The negative value of (ΔG^o, ΔH^o and ΔS^o) confirmed the sorption process was exothermic. The capability and usefulness of CM-β-CD-Fe₃O₄NPs for removing the boron from aqueous media was effectively proven. This method can not only adsorb harmful heavy metal elements, but also remove harmful substances, which has very high application value.

KEYWORDS:

• Boron
• CM-β-CD-Fe₃O₄NPs
• adsorption capacity
• kinetic
• thermodynamic

Acknowledgements

The authors gratefully acknowledge partial support of ‎this work by the Islamic Azad University, Branch of Omidiyeh, Iran.‎

Disclosure statement

The authors declare that they have no conflict of interest related to the publication of this article.