Adsorption And Photocatalytic Performance Of Red Phosphous For High Concentrations Of Organic Materials

Because of the excellent light absorption properties,elemental red phosphorus?RP?has gradually received attention and research in the field of photocatalysis.However,since the photocarriers of pure RP are easier to recombine,their photocatalytic activity is still at a relatively low level.In this paper,the commercial RP is treated by hydrothermal method to study its adsorption and photocatalytic performance for a series of organic pollutants.Based on the above consideration,we studied the degradation performance of Ag/RP on high-concentration of methyl orange?MO?and discussed the enhancement mechanism of Ag on RP activity through loading precious metal Ag.The main research contents and conclusions are as follows:?1?The commercial RP was hydrothermally treated at a certain temperature and showed excellent physical adsorption properties for the common methyl orange?MO?,rhodamine B?RhB?and methylene blue?MB?.At the same time,under the condition of visible light??>420 nm?,RP could also degrade high concentration of MO?50 mg/L?and RhB?20 mg/L?solutions.The results of dark adsorption experiments showed that RP had good adsorption characteristics for several organic solutions since it has a large specific surface area.The sufficient contact of RP and organic molecules facilitated to improve the photocatalytic activity under light irradiation.This experiment provides ideas for designing RP-based photocatalysts with good adsorption properties.?2?The Ag/RP composite photocatalyst was prepared by photoreduction method.Under visible light??>420 nm?,Ag/RP composite efficiently degraded high concentration of MO solution?50 mL,50 mg/L?.The excellent photocatalytic degradation activity was attributed to the effectively capture and transfer of the photogenerated electrons by nano-Ag,which greatly promoted the formation of strong oxidizing active species·O₂^-and accelerated the degradation rate of MO.This work has laid the foundation for the development of RP-based photocatalysts that efficiently degrade high-concentration of organic pollutants.