Abstract
• KNO 3 pellets were encapsulated in graphene oxide (GO) films. • Separated GO sheets fuse together to form a shell on KNO 3. • GO-coated KNO 3 pellets exhibited slow-release behavior. A slow-release fertilizer was developed by encapsulating KNO 3 pellets with graphene oxide (GO) films. The material was then subjected to heat treatment, where adjacent GO sheets were soldered and reduced to reduced graphene oxide (re-GO) sheets by potassium. After the re-GO shell formed on KNO 3 pellets, the slow-release characteristics of the fertilizer dramatically improved. The process of releasing fertilizer was prolonged to 8 h in water. We believe that this new coating technology could hold great promise for the development of environmentally-benign controlled-release fertilizer for crop production.
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