华中农业大学在稻田农药残留去除及病害绿色防控方面取得新进展

　　近日，华中农业大学植物科学技术学院农药毒理团队研究成果以“Magnetic MXene based metal organic frameworks composites: synthesis, characterization and application”为题在Journal of Environmental Chemical Engineering上发表。该研究合成了一种既可抑制稻瘟病病菌（Magnaporthe grisea Barr.）又可以吸附去除稻田残留农药的磁性MOF复合材料。

 

　　研究人员结合二维无机化合物MXene和金属有机骨架Zn-MOF-74合成了一种兼具吸附及抗菌能力的多功能磁性复合材料Fe3O4@MXene@MOF-74。经FT-IR，TEM，SEM，XRD，VSM，BET，TG等一系列表征分析，证实该材料具有稳定的化学结构，表面富含大量的官能团，可以快速分散在水环境中。基于该材料建立了稻田生态系统中4中三唑类杀菌剂多残留的去除方法，在取自三个省市的稻田水样加标实验中，对目标药剂去除效率高达90 %以上。重复利用性实验证实，该材料连续五次吸附-解吸循环后，仍可以保持稳定的结构，对目标杀菌剂仍具有较高的去除率。此外，在复合材料生物活性研究方面发现，该材料对稻瘟病菌病菌表现出明显的抑制作用，表明该材料对稻田常见病害的防治具有较好的潜力。该研究对稻田生态系统中农药残留净化去除以及多功能吸附剂的开发具有重要意义。

 

　　植物科学技术学院硕士研究生卢志衡为该论文第一作者，杨中华副教授为通讯作者，国家地质实验测试中心教授级高级工程师田芹也参与了该研究。该研究得到国家重点研发计划项目（2019YFD1002103）、国家自然科学基金（21507032）、湖北省自然科学基金（2020CFB528）和中国农业科研系统专项资金（CARS-31-31）资助。

 

　　【英文摘要】

 

　　Triazole fungicides are the most frequently used in preventing and controlling rice blast due to their high efficacy, broad spectrum and long effective duration. However, serious environmental problems might be posed by these agricultural chemical's residues. In this work, a novel magnetic composite （Fe3O4@MXene@MOF-74） was synthesized by a facile strategy and applied to remove triazole fungicides. Specifically, the morphology and property of this prepared material was analyzed by a series of characterizations. The adsorption performances were systematically investigated, and the maximum adsorption capacity towards epoxiconazole and tebuconazole were 120.96 and 108.26 mg g?1, respectively. The adsorption process could be described by pseudo-second-order kinetic model and Langmuir isotherm model, and the adsorption mechanism was predominantly determined by hydrogen bonding, covalent bonding and π-π stacking, along with electrostatic and physical interaction. In actual application, the satisfactory removal performances were obtained in paddy field water samples. Finally, it is worth mentioning that Fe3O4@MXene@MOF-74 was proved to have antibacterial activity, and the effective concentration for 50% inhibition （EC50） value against mycelium growth of Magnaporthe grisea Barr. was 0.70 g L?1. Consequently, bi-functional properties of excellent adsorption performance and antibacterial activity make Fe3O4@MXene@MOF-74 a great potential in paddy field applications.

 

　　论文链接：https://www.sciencedirect.com/science/article/pii/S2213343722009101?dgcid=author