Magnetic photocatalyst for efficiently reducing heavy metal ions under natural light and preparation method thereof

The invention discloses a preparation method of a magnetic photocatalyst capable of efficiently reducing heavy metal ions under natural light, the magnetic photocatalyst takes nano lignocellulose as a skeleton, the nano lignocellulose is subjected to ultrasonic treatment, then the surface of the nano lignocellulose is subjected to chemical Ni plating for one time and two times, nano composite graphene Fe3O4-coated Graphene is added in the second chemical Ni plating process, and then a magnetic hollow rod-shaped structure is formed; a sol-gel method is utilized, composite treatment is conducted, then high-temperature treatment is conducted under the nitrogen condition, and the Ni-NiO/Fe3O4-coated Graphene-TiO2 magnetic hollow rod-like material is successfully prepared. And finally, putting the photocatalytic material under natural light to photocatalyze heavy metal ions. 本发明公开了一种在自然光下高效还原重金属离子的磁性光催化剂的制备方法，磁性光催化剂以纳米木质纤维素为骨架，首先超声处理，然后其表面经过1次和2次化学镀Ni，第2次化学镀Ni过程中添加纳米复合石墨烯Fe3O4@Graphene，进而形成磁性中空棒状结构；利用溶胶-凝胶法，复合处理然后