The effectiveness of phosphate (P) removal from aqueous solutions was investigated by novel low-cost bioehars synthesized from vinasse and functionalized with calcined dolomite.The vinasse-derived biochar,synthesized via pyrolysis at different temperatures,showed easy preparation and a large surface area.The novel vinasse biochar nanocomposites were prepared by adding dolomite to the vinasse biochars with different weight percentages (10,20 and 30％).The characteristics of the prepared materials were identified for further understanding of the inherent adsorption mechanism between P ions and vinasse biochars.Vinasse-dolomite nanocomposite was very effective in the adsorption of P species from aqueous media.The effect of the operational factors on Vinasse-dolomite nanocomposite was explored by applying response surface methodology (RSM).According to RSM results,the optimum condition was achieved to be contact time 90 (min),250 (mg/L) of P concentration and pH 7.Thermodynamic isotherm and kinetic studies were applied on experimental data to understand the adsorption behavior.The Vinasse-dolomite nanocomposite revealed preferential P species adsorption in the presence of co-existing anions.The P species could be recovered by 1.0 M HC1 where the efficiency was not affected up to the fifth cycle.The P-loaded Vinasse-dolomite nanocomposite was successfully tested on a plant;it significantly improved its growth and proved its potency as a P-based fertilizer substitute.