Optimisation of phosphate loading on graphene oxide-Fe(iii) composites - possibilities for engineering slow release fertilisers 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
New Journal of Chemistry
年/卷/期
2019 / 43 / 22
页码
8580-8589
ISSN号
1144-0546
作者单位
Univ Adelaide, Sch Agr Food & Wine, PMB 1,Waite Campus, Glen Osmond, SA 5064, Australia;Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;Univ Adelaide, Sch Agr Food & Wine, PMB 1,Waite Campus, Glen Osmond, SA 5064, Australia;Univ Adelaide, Sch Agr Food & Wine, PMB 1,Waite Campus, Glen Osmond, SA 5064, Australia;CSIRO Land & Water, Environm Contaminant Mitigat & Biotechnol Program, PMB 2, Glen Osmond, SA 5064, Australia;Univ Adelaide, Sch Chem Engn, Adelaide, SA 5005, Australia;Univ Adelaide, Sch Agr Food & Wine, PMB 1,Waite Campus, Glen Osmond, SA 5064, Australia;
作者
Andelkovic, Ivan B.;Kabiri, Shervin;da Silva, Rodrigo C.;Tavakkoli, Ehsan;Kirby, Jason K.;Losic, Dusan;McLaughlin, Michael J.;
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.
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