Preparation of oxygen-doped carbon nitride and its degradation performance on pesticide residues in farmland
[Aims]The aims of this study are constructing photocatalytic degradation technology for 4 frequently used pesticides including carbendazim in tobacco-rice rotation fields under visible light,clarifying the degradation mechanism and providing theoretical and technical support for alleviating the problem of excessive pesticide residues in crops during the harvest period.[Methods]Oxygen-doped carbon nitride nanomaterial was synthesized via polymerization at high temperature.The microstructure of the materials was analyzed by scanning electron microscopy and other characterization techniques.The materials with the best degradation performance were evaluated and screened through the photocatalytic degradation experiment,and the influence of complex factors on the degradation process was studied.[Results]The oxygen doping process of carbon nitride effectively improved the photocatalytic degradation performance for the investigated pesticides.The degradation rate of optimized material(OCN01)for carbendazim could surpass 94.6％just in 1 h under visible light.The contribution of each ROS was quantified in the following order:h+＞1O2＞·O2-,based on the results of trapping experiments.Apart from efficient degradation of the investigated pesticides in aqueous environment,the maximum of degradation efficiency for target pesticides in plant increased in the field conditions by 39.95％at 48 h after spraying the OCN01 material.[Conclusions]The OCN0.1 material can effectively reduce the level of pesticide residues in farmland environment and crops,and has a potential application prospect.
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