Preparation of Ni5P4/Ni Porous Composite Using Ni Foam As Skeleton and Its Application in Restoration of Large Volume Effluent with A High Concentration of 4-Nitrophenol at Room Temperature
In the present work, Ni5P4/Ni porous composite with Ni foam as skeleton was prepared through phosphorization calcination at 500 C. Meanwhile, the catalytic activity of the as-prepared Ni5P4/Ni porous composite was explored for the restoration of large volume effluent with a high concentration of 4-nitrophenol at room temperature. At last, the catalytic mechanism was discussed preliminarily. The results indicate that the Ni5P4/Ni porous composite possesses dramatic catalytic activity for the borohydride-assisted reduction of 4-nitrophenol. When the concentration of 4-nitrophenol is 1.0 10-3 mol L-1, the catalytic reduction efficiency of 4-nitrophenol is up to 99% within 13 min over the aforementioned sample. More interested, it is suitable for the restoration of large volume effluent with a high concentration of 4-nitrophenol. Almost 99% 4-nitrophenol (1.0 10-2 mol L-1, 100 mL) can be removed within 30 min. Even when 4-nitrophenol is near saturation in water (5.0 10-2 mol L-1), 4-nitrophenol can still be removed absolutely from water after 165 min reaction in the presence of Ni5P4/Ni porous composite. In the catalytic process, Ni5P4 would serve as active sites and accelerate the formation of hydrogen atoms from BH4-, meanwhile the Ni skeleton would make the electron transfer faster in the catalytic system. Besides, the macroporous structure of the sample also plays an important role in the catalysis process.