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Synthesis and characterization of gum ghatti grafted chelating copolymer for an effective removal of uranyl ions

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Abstract

In this report, we intended to synthesize chelating grafted copolymer of gum ghatti with acrylonitrile (Gg-g-An) by gamma irradiation as proficient and influential adsorbent for removal of uranyl ions. These grafted and modified copolymers were characterized using different techniques viz. FTIR, Elemental analysis, TGA and FESEM. Maximum grafting was accomplished with 5% gum ghatti solution and 1:3 ratio of acrylonitrile to backbone at 25 kGy total radiation dose. Surface area of grafted copolymer was calculated by BET analysis. Adsorption experiments reveal the adsorption capacity was effectively influenced at pH 6 with maximum adsorption 94% which substantiated Gg-g-AO surface engross excellent potential as chelating agent for adsorption of uranyl ions. Uptake of uranyl ions by Gg-g-AO was confirmed using spectroscopic and EDX analysis. The result showed that the pseudo second order reaction and Langmuir adsorption isotherms had remarkable conformity through linear fit statistics with r2 0.998 and 0.978 respectively. Furthermore, the thermodynamic parameters illustrated that the uranyl ions adsorption process by Gg-g-AO was endothermic and spontaneous. Desorption studies of Gg-g-AO confirmed the reusability up to three cycles in 0.1 M HCl. This study substantiated that the synthesized Gg-g-AO has impending use in environmental remediation.

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Abbreviations

An:

Acrylonitrile

AO:

Amidoximation

DMF:

Dimethyl formamide

FTIR:

Fourier Transform Infrared Spectroscopy

TGA:

Thermogravimetric analysis

BET:

Brunauer–Emmett–Teller

FESEM:

Field Emission Scanning Electron Microscopy

EDX:

Energy dispersive X-ray Analysis

Gg:

Gum ghatti

Gg-g-An:

Gum ghatti grafted acrylonitrile

Gg-g-AO:

Amidoximated Gum ghatti grafted acrylonitrile

%GE:

Percent grafting efficiency

%GY:

Percent grafting yield

%C:

Percent conversion

%H:

Percent homopolymer

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Acknowledgments

The authors thank Department of Chemistry, SPPU for providing laboratory amenities. Authors are also thankful to SAIF, IIT Bombay, Powai, Mumbai and SAIF, SPPU, Pune for providing characterization facilities.

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Authors and Affiliations

  1. Department of Chemistry, Savitribai Phule Pune University, Pune, Maharashtra, India

    Gauri Shelar-Lohar & Satyawati Joshi

  2. Department of Chemistry, Fergusson College, Shivajinagar Pune, Maharashtra, India

    Gauri Shelar-Lohar

Authors
  1. Gauri Shelar-Lohar
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  2. Satyawati Joshi
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Correspondence to Satyawati Joshi.

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Highlights

• Gg-g-An copolymer was synthesized by γ –irradiation method.

• Grafting of An onto Gg and modification to amidoximation Gg-g-AO were evidenced by FTIR, TGA and FESEM studies.

• Chelating Gg-g-AO has potential competence to recover uranyl ions from aqueous solution.

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Shelar-Lohar, G., Joshi, S. Synthesis and characterization of gum ghatti grafted chelating copolymer for an effective removal of uranyl ions. J Polym Res 26, 179 (2019). https://doi.org/10.1007/s10965-019-1781-x

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