The Preparation And Properties Of BiPO₄/Graphene Composites

Graphene as a magical material possesses a lot of properties, such as large specific surface area, excellent mechanical property and efficient thermal conductivity. Therefore it has great potential in future source of energy, environment, catalyst, battery and so on.3D graphene hydrogel is made based on graphene layers, possessing three-dimensional structure and pore structure and inheriting the good performance of graphene. The 3D graphene hydrogel also owns unique properties.The 3D graphene hydrogel is used for the adsorption of BPA. Different reaction contact time, different temperatures and different p H have been studied. It is proved that3 D graphene hydrogel has very good adsorption capacity for BPA. Temperature experiment proves that the adsorption reaction is an exothermic process. Different p H experiment indicate that the adsorption capacity remains firm under acidic condition and neutral condition. The adsorption fits the pseudo-second-order kinetic model and Langmuir model indicating that adsorption is mainly by hydrophobic interaction and π-πinteractions between 3D graphene and BPA molecule. The saturated adsorption capacity at 302.15 K is 250 mg/g. This paper also studied the adsorption of BPA with very low concentration by solid phase extraction techniques, indicating that 3D graphene hydrogel cannot adsorb completely at low concentration through static adsorption, therefore dynamic adsorption is used to study the adsorption capacity. The 3D graphene hydrogel is filled into the adsorption tube and make the water flow through the adsorption tube thus can receive the clean water. It is significance for water pollution.Bi PO4 has more effective photocatalytic activity than P25. Graphene is an excellent carrier for electron. Synthesis of Bi PO4 is by hydrothermal method and add graphene to synthesis Bi PO4/RGO composite. Bi PO4 can play a supporting role to support the graphene layers and prevent agglomeration to increase adsorption capacity and graphene can promote the electronic transmission to enhance photocatalytic activity. The composite can play a synergistic effect between adsorption and photocatalysis.