Enhanced removal of nitrate from water using amine-grafted agricultural wastes
Highlights
•
Ground coconut copra and corn cob particles surfaces are readily amine-grafted.
•
Amine-grafting reversed the particles' surface charge from negative to positive.
•
Amine-grafting of the waste particles increased nitrate adsorption capacity.
•
Nitrate adsorption capacity reduced by co-ions; sulphate > chloride > phosphate.
•
Fixed-bed nitrate adsorption data fitted well to Thomas and plug-flow models.