摘要
Developing an excellent photocatalysis system to remove pesticides from water is an urgent problem in current environment purification field.Herein,a Z-scheme WO_(3)/g-C_(3)N_(4) photocatalyst was prepared by a facile in-situ calcination method,and the photocatalytic activity was investigated for degradation of nitenpyram(NTP)under visible light.The optimal Z-scheme WO_(3)/g-C_(3)N_(4) photocatalyst displayed the highest rate constant(0.036 min-1),which is about 1.7 and 25 times higher than that of pure g-C_(3)N_(4) and WO_(3),respectively.The improvement of photocatalytic performance is attributed to fast transfer of photogene rated carriers in the Z-scheme structure,which are testified by electron spin resonance(ESR)experiments,photocurrent and electrochemical impedance spectra(EIS)measurements.Moreover,the effects of typical water environmental factors on the degradation NTP were systematically studied.And the possible degradation pathways of NTP were deduced by the intermediates detected by highperformance liquid chro matography-mass spectrometry(HPLC-MS).This work will not only contribute to understand the degradation mechanism of pesticides in real water environmental condition,but also promote the development of new technologies for pesticide pollution control as well as environmental remediation.
基金
financially supported by the National Science Funds for Creative Research Groups of China(No.51421006)
National Natural Science Foundation of China(No.51679063)
the Key Program of National Natural Science Foundation of China(No.91647206)
the National key Plan for Research and Development of China(No.2016YFC0502203)
A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(No.51479064)。
