Abstract

An exceedingly facile green approach that produces a reliable adsorbent of transition metal such as Iron (Fe) using Mangifera Indica leaf extract at room temperature is described, acquires more significance nowadays. A single pot method used for synthesis with no capping agents, surfactants or other templates. The main intention of this study is to synthesize iron nanoparticles from leaf extract (Mangifera Indica) and examine its degradation potential for photo-catalytic removal of dyes (Congo red & brilliant green) from waste water. Characterization of synthesized nanoparticles was executed by pHpzc, SEM & FTIR studies and results confirms the presence of iron Nano-sheets with biomolecules. All photo-catalytic experimental results were discussed by SSE and Simple linear regression (SLR) R2 with dye concentration, pH, contact time and dose rate as dependent and independent variables. Adsorption experimental data was verified by kinetics and isothermal models. Results proposed that Langmuir and Pseudo-2nd order model give best fitness towards photo-catalytic adsorption procedure. Thermodynamics revealed that adsorption mechanism is endothermic described by the values of Gibbs free energy (ΔG), enthalpy (ΔH) with entropy (ΔS) and said to be chemisorption with spontaneous processes. Overall photo-catalytic adsorption execution of synthesized iron nanoparticles and simple biomass of Mangifera Indica gives satisfactory results for treating dyes waste water.

HIGHLIGHTS

  • Mangifera Indica extract was put to use for green synthesization of FeNPs by a single pot method. Fe-NPs and powdered biomass of Mangifera Indica was adapted for photo-catalytic degradation of synthetic dyes. Green Synthesized FeNPs form dense nano-sheets with thickness of about 20–50 nm and size. Maximum % photo-catalytic degradation was for Congo red (72.6, 80.87%) and Brilliant green (72.88, 82%) with biomass & NPs.

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