Adsorption of phosphate on UiO-66-NH2 prepared by a green synthesis method

In this study, a zirconium-based metal organic framework (UiO-66-NH2) was prepared with a green synthetic method for removal of phosphate from solution. Several characterization methods were performed and the adsorption property of UiO-66-NH2 toward phosphate was explored in batch mode. There was a good adsorption performance for phosphate with a wide range of pH (pH = 2-11) with a slight effect of salinity. The adsorption capacity was up to 43.9 mg.g(-1) at 303 K from experiments. The adsorption isotherms can be better described by Langmuir, Temkin, and Koble-Corrigan model while adsorption kinetics can be well fitted by Pseudo-secondorder, Double Constant and Elovich model. The process was spontaneous and exothermic and the major mechanism of phosphate adsorption was complexation. The spent adsorbent can be well regenerated using 0.01 mol.L-1 NaOH. The study shows that UiO-66-NH2 has the potential to remove phosphate from solution.

Automated summary

In this study, a zirconium-based metal organic framework (UiO-66-NH2) was prepared with a green synthetic method for removal of phosphate from solution. The material showed good adsorption performance for phosphate across a wide pH range and could be easily regenerated for repeated use.