Development of Biomass-Based Anion Exchanger for the Removal of Trace Concentration of Phosphate from Water

  • Bhoj Raj Poudel Tribhuvan University, Kirtipur Kathmandu, Nepal
  • Ram Lochan Aryal Tribhuvan University, Kirtipur Kathmandu, Nepal
  • Lokjan Bahadur Khadka Tribhuvan University, Kirtipur Kathmandu, Nepal
  • Kedar Nath Ghimire Tribhuvan University, Kirtipur Kathmandu, Nepal
  • Hari Paudyal Tribhuvan University, Kirtipur Kathmandu, Nepal
  • Megh Raj Pokhrel Tribhuvan University, Kirtipur Kathmandu, Nepal
Keywords: Mango waste, phosphate anion, Al (III) loading, elemental analysis, adsorption capacity

Abstract

Aluminum loaded saponified Mango Waste i.e. Al (III)–SMW adsorbent, which functions as anion exchanger, was developed by loading Al (III) onto lime treated Mango waste biomass. The characterization of adsorbent was done by an Energy Dispersive X-ray (EDX) spectroscopy and chemical analysis techniques.  Elemental analysis showed an exchange of Ca (II) or K (I)  from SMW with Al (III) during loading reaction via cation exchange mechanism. Phosphate adsorption is strongly pH-dependent and maximum adsorption occurs at pH around 7– 9. The maximum uptake capacity of Al (III)–SMW for phosphate was found to be 3.28 mg/g from the Langmuir isotherm model. The residual concentration of phosphate was sharply decreased by increasing the amount of Al (III)–SMW and reached less than 0.07 mg/L (from 9.7 mg/L) with the use of only 6 g/L of Al (III)–SMW whereas higher than 7 g/L successfully removed 100% of phosphate from water. The adsorbed phosphate was successfully desorbed and the adsorbent was regenerated using dilute alkali solution. Therefore, the Al (III)–SMW adsorbent investigated in this research work is expected to be a potential material for the treatment of water polluted with a trace amount of phosphate from aqueous solution.

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Author Biographies

Bhoj Raj Poudel, Tribhuvan University, Kirtipur Kathmandu, Nepal

Central Department of Chemistry and Department of Chemistry, Tri-Chandra Multiple Campus, Tribhuvan University, Kathmandu, Nepal

Ram Lochan Aryal, Tribhuvan University, Kirtipur Kathmandu, Nepal

Central Department of Chemistry

Lokjan Bahadur Khadka, Tribhuvan University, Kirtipur Kathmandu, Nepal

Central Department of Chemistry

Kedar Nath Ghimire, Tribhuvan University, Kirtipur Kathmandu, Nepal

Central Department of Chemistry

Hari Paudyal, Tribhuvan University, Kirtipur Kathmandu, Nepal

Central Department of Chemistry

Megh Raj Pokhrel, Tribhuvan University, Kirtipur Kathmandu, Nepal

Central Department of Chemistry

Published
2020-08-05
How to Cite
Poudel, B., Aryal, R., Khadka, L., Ghimire, K., Paudyal, H., & Pokhrel, M. (2020). Development of Biomass-Based Anion Exchanger for the Removal of Trace Concentration of Phosphate from Water. Journal of Nepal Chemical Society, 41(1), 56-63. https://doi.org/10.3126/jncs.v41i1.30488
Section
Articles