Preparation of phosphorus-doped carbon quantum dots and activation of peroxymonosulfate for degradation of methylene blue
A phosphorus-doped carbon quantum dots(P-CQDs)method was reported,detailed characterization of P-CQDs was performed by infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and transmission electron mi-croscopy(TEM),and the results confirmed that phosphorus was successfully accessed CQDs.The introduction of phospho-rus could reduce the forbidden band width of CQDs,thus improving the absorption of light and promoting photogenerated electron transfer.Under visible light irradiation,the degradation of MB was 99%in 10 min at the PMS concentration of 0.4 mmol/L at the P-CQDs dosage of 0.5 g/L.The effects of P-CQDs dosage,PMS concentration and MB concentration on the system degradation efficiency of MB were investigated.Meanwhile,the mechanism of MB degradation by P-CQDs photo-catalytically activated PMS was investigated by free radical burst experiments,and the results showed that superoxide radi-cal(O2·-)was the main active substance.
carbon quantum dotsperoxymonosulfatecatalytic degradationmethylene blue