Preparation Of CdSe@NPC From ZIF-8 And Its Photocatalytic Activity

In recent years,three-dimensional porous carbon material because of its large surface area,high porosity,chemical stability,very good conductivity and other advantages to attract people's research interests.In this paper,ZIF-8 was used as a precursor to synthesize porous carbon material with uniform pore size and specific surface area.The traditional semiconductor photocatalyst CdSe was loaded on this material to form CdSe @ NPC,a heterogeneous structure.And its morphology was characterized by the degradation of organic dye molecules rhodamine B(RhB).Firstly,ZIF-8 was synthesized by room temperature synthesis and calcined at 500 ?under an inert atmosphere to obtain nano-porous carbon(NPC).This new type of NPC material can keep the original skeleton of ZIF-8 unchanged,and has a large specific surface area,Structural stability and so on.EV-W-CdSe@NPC,EV-WE-CdSe @ NPC,EV-E-CdSe@NPC,and EV-W-CdSe @NPC were obtained by using different volume of CdSe and NPC,and then CdSe@NPC composites were obtained by equal volume impregnation method.HEV-W-CdSe@NPC,HEV-E-CdSe@NPC,QEV-W-CdSe@NPC,QEV-WE-CdSe @NPC,QEV-E-CdSe @NPC.Secondly,the content of cadmium selenide in CdSe @ NPC composites was determined by inductively coupled plasma atomic emission spectrometry(ICP-AES).X-ray powder diffraction(XRD),physical adsorption(BET)and TEM Characterization of the structure and morphology of the characterization and found that cadmium selenide and nano-porous carbon was successfully assembled together,and NPC materials always maintain the original shape of the same.Finally,the photocatalytic degradation of rhodamine B with CdSe@NPC composites showed that the content and dispersion of CdSe were two important factors affecting the photocatalytic performance of the composites: the degradation effect of EV-WE-CdSe@NPC on rhodamine B Preferably,30 mL of 0.02 mmol RhB in 20 mg of catalyst was completely degraded for 60 min,and the photocatalytic activity was still good after four cycles of cycling.In this photocatalytic system,we added the different capture agents to explore the mechanism of photocatalytic degradation of the system.It is believed that the superoxide radical(O2-.)and the hole(h+)are the main active substances.In rhodamine B photocatalytic degradation plays a decisive role.