The synthesis of triamine-bearing porous silica for the effective adsorption of nitrate and phosphate ions

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Phuoc T. Phan
Thai A. Nguyen
Nhat H. Nguyen
Long G. Bach
Phuoc S. Le
Trung T. Nguyen


This work focuses on determining the effect of material synthesis conditions and studying on kinetic, isothermal and thermodynamic parameters of nitrate and phosphate adsorption by triamine-bearing porous silica (TRI-P- ) material. The innovation of this study is to improve the surface of  through chemical corrosion reaction with hydrofluoric acid (HF) before grafting with triamine silane. In the suitable condition of synthesis including 5% of HF concentration, and a ratio of 3 mL/g between the volume of Triamine-Silane and the weight of P- , the uptake rates of nitrate and phosphate adsorption are 33.4 and 10.8 mg/g, respectively. Moreover, the adsorption data of these ions are highly compatible with Pseudo-second-order kinetics in which values ​​of the correlation coefficients (r2) are greater than 0.99. Moreover, these adsorption processes have been well described by Langmuir and Freundlich isotherm models (r2>0.96). The nitrate and phosphate adsorption capacities are 125.0 and 112.4 mg/g, respectively. Along with the good resulting adsorption, the large number of adsorption cycles also highlight the usefulness of this material. In general, this material can be used to remove nitrate and phosphate ions in advanced feedwater and wastewater treatment processes.


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