A Novel Magnesium Slag-Based Cementitious Nano-Com- posite for Photocatalytic Degradation of Dye

摘要:

合成一种新型廉价的负载双金属氧化物NiO和CuO的碱激发镁渣基纳米复合胶凝材料(AMSCN)，并将其用于光催化甲基橙染料降解的探索性研究。FESEM结果表明：碱激发镁渣基胶凝材料具有大约30 nm的形貌特征；XRD结果表明：碱激发镁渣基胶凝材料主要是由水化硅酸钙等矿物相所组成，而纳米复合胶凝材料中的NiO以无定形的方式、CuO以大约15 nm大小的颗粒均匀地分散在碱激发镁渣基胶凝材料的基质上。10(NiO+CuO)/AMSCN 纳米复合胶凝材料高的光催化甲基橙染料降解活性归因于AMSCN载体与NiO及CuO活性相的协同作用，其光催化降解反应为一级反应动力学

Abstract:

A novel alkali-activated magnesium slag-based cementitious nanocomposite (AMSCN) was synthesized by co-loaded NiO and CuO, and employed as a photocatalyst for the degradation of methyl orange dye. The FESEM images reveal that the AMSCN has a nanostructural morphology with average size of about 30 nm. The XRD patterns show that the AMSCN is principally composed of mineralogical phase of calcium silicate hydrate (C-S-H). NiO active species are uniformly dispersed in the form of amorphous phase and CuO emerged nanophase with mean size of 15 nm on the surface of AMSCN. The 10(NiO+CuO)/AMSCN nanocomposite exhibits the highest photocatalytic degradation rate (93%) due to the synergistic effect between the AMSCN matrix and active species of NiO and CuO. The kinetics analysis indicates that the photocatalytic degradation of methyl orange follows the first order reaction kinetics