Visible light-assisted oxygen-doped graphite carbon nitride activated sulfite for degradation of bisphenol A in water
Endocrine disrupting chemical is a kind of environmental hormone,which interferes with the en-docrine system of animals and affects their reproductive development.Bisphenol A(BPA),a typical endo-crine disruptor,is defined as an emerging contaminant,with adverse impact on the environment and human health.Metal-free oxygen-doped graphite carbon nitride(O-C3N4)materials were prepared by a simple thermal synthesis method,and the microscopic morphology of the catalysts was characterized using high-resolution transmission electron microscopy(HRTEM).The kinetics of the degradation of BPA by the O-C3N4 synergistic visible light activate sulfite(O-C3N4/S(Ⅳ)/Vis)system,the influence of environmental factors and the contribution of the reactive oxygen species(ROS)in the system to the degradation of BPA were investigated.The effect of inorganic anions(Cl-,HCO3-,SO42-,NO3-)and natural organic matter on the reaction system was investigated.The O-doped materials are more fluffy and porous,which can provide more active sites for the reaction.The removal rate of 0.05 mmol/L BPA is 83.9％in 90 min with O-C3N4 at 0.2 g/L and S(Ⅳ)at 0.3 mmol/L,which is 4.23 times higher than that of the g-C3N4/S(Ⅳ)/Vis sys-tem and 4.82 times higher than that of the O-C3N4/S(Ⅳ)system.The removal of BPA increases with in-creasing amounts of O-C3N4 and S(Ⅳ)over a range of dosing.The system is able to remove BPA at an ini-tial pH value range of 3.0-9.0,with the best degradation effect under neutral conditions.SO5·-and sin-glet oxygen(1O2)in the reaction system play major roles in the degradation of BPA.
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