氧化石墨烯(GO)及复合物制备及其对汞吸附特性的研究

Fabrication of Graphene Oxide(GO)Based Nano-composites and the Applications in Hg^0 Adsorption

以石墨粉(G)为原料,通过化学方法制备了氧化石墨烯(GO)、纳米Fe_3O_4负载石墨烯复合材料(MGO)、纳米Ag颗粒修饰磁性氧化石墨烯(GO-Ag/MGO-Ag)四种吸附材料,对材料进行了表征并考察了氧化石墨烯及其复合物对烟气中汞的吸附作用。研究表明四种石墨烯基吸附剂可被成功合成和表征;GO在100-150℃时对Hg^0表现出优异的吸附性能,Ag-NPs修饰GO能有效提升吸附剂对汞的吸附能力,MGO-Ag复合吸附剂对汞的吸附能力最佳;MGOAg在150~200℃时表现出优异的汞吸附能力,在反复循环之后吸附性能几乎不变;以MGO-Ag为代表的可再生磁性石墨烯基复合吸附剂在中低温条件下对Hg^0具有优异的吸附性能,且能有效与飞灰进行分离,具有良好的工业应用前景。

Nano-composites including graphene oxide（GO）, fbrriferrous oxide nano particles （Fe-NPs） loading graphene oxide （MOO）, nano silver particles （Ag-NPs） decorated GO and MGO （GO-Ag/MGO-Ag） were fabricated via facile chemical methods. All the four kinds of nano-composites were well characterized by advanced instruments, and were tested for their capability of Hg0 adsorp- tion in flue gas. The results indicated that the four kinds of nano-composites can be synthesized successfully by the facile chemical methods. GO show a good Hg0 adsorption performance when the temperature is range from 100℃ to 150℃, the Ag-NPs decorated GO can greatly enhance the Hg0 adsorption capability. MGO-Ag performances best of all the four composites on Hg0adsorption. The optimum working temperature for MGO-Ag on Hg0 adsorption are about 150℃-200℃, and the MGO-Ag can be recycled after successive adsorption and desorption without any significance loss in adsorption performance. The recyclable nano-composites of MGO-Ag can be served as an excellent candidates for Hg0 adsorption under medium-low temperatures （100-200℃） . Further, the decoration of Fe-NPs helps for the separation of the materials and the fly ash in a real case of coal-fired power plants, which provides great advantages in practical applications.