• 文献标题:   Optimisation of phosphate loading on graphene oxide-Fe(iii) composites - possibilities for engineering slow release fertilisers
  • 文献类型:   Article
  • 作  者:   ANDELKOVIC IB, KABIRI S, DA SILVA RC, TAVAKKOLI E, KIRBY JK, LOSIC D, MCLAUGHLIN MJ
  • 作者关键词:  
  • 出版物名称:   NEW JOURNAL OF CHEMISTRY
  • ISSN:   1144-0546 EI 1369-9261
  • 通讯作者地址:   Univ Adelaide
  • 被引频次:   3
  • DOI:   10.1039/c9nj01641d
  • 出版年:   2019

▎ 摘  要

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 p-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.