Optimisation of phosphate loading on graphene oxide-Fe(iii) composites-possibilities for engineering slow release fertilisers

Ivan B. Andelkovic, Shervin Kabiri, Rodrigo C. Da Silva, Ehsan Tavakkoli, Jason K. Kirby, Dusan Losic, Michael J. Mclaughlin

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Current commercially available phosphorus (P) fertilisers, which are highly soluble salts, are susceptible to surface runoff to waterways, and leaching to groundwaters where soils are light/medium textured. Here, we report the synthesis of a graphene oxide (GO)/iron (GO-Fe) composite, a promising carrier for loading P. The GO-Fe carriers loaded with P acted as slow release fertilisers with tunable loading/release properties. The amount of P loaded onto the GO-Fe composite was 15%, similar to commercial products. Investigation of the morphology and spectroscopic and chemical analysis revealed a complex loading mechanism of Fe onto GO. Iron, as an active center for P sorption, could interact with the oxygen functional groups at the edge of GO sheets as well as the π-electron system of the aromatic part of GO. Column perfusion studies, visualisation of P diffusion in soils and chemical analysis of soils after diffusion showed the composites to have slow-release properties. Pot experiments using wheat and our composites resulted in the same yield as using highly soluble commercial fertiliser.

Original languageEnglish
Pages (from-to)8580-8589
Number of pages10
JournalNew Journal of Chemistry
Volume43
Issue number22
Early online date13 May 2019
DOIs
Publication statusPublished - 14 Jun 2019

Fingerprint Dive into the research topics of 'Optimisation of phosphate loading on graphene oxide-Fe(iii) composites-possibilities for engineering slow release fertilisers'. Together they form a unique fingerprint.

  • Cite this