一种生态友好粉煤灰基地质聚合物的合成及光催化性能

以乌洛托品为孔形成剂,制备出孔结构可调控的粉煤灰基地质聚合物;通过半导体耦合设计,合成出In_2O_3和NiO双负载粉煤灰基地质聚合物催化剂;采用XRF、TGA/DSC、FESEM、XRD、FT-IR、UV-Vis等对催化剂的组成、结构及性能进行表征,考查了该催化剂体系对模拟印染废水的光催化降解活性、降解机理及反应动力学。结果表明:孔形成剂的掺入能够显著地改善地质聚合物的孔结构,调变BET比表面积及介孔体积;双负载5%In_2O_3及1%NiO的粉煤灰基地质聚合物催化剂对碱性品绿染料的最高降解率(95.65%),归因于In_2O_3与NiO形成的p-n结半导体耦合体系以及In_2O_3与PAFAG载体之间产生强相互作用,改善了光生电子-空穴对的分离效率,从而提高了光催化染料降解活性。

An Eco-friendly Fly Ash-Based Geopolymer: Synthesis and Photocatalytic Properties

The fly ash-based geopolymer with regulable pore structure was firstly synthesized by using urotropine as pore forming agent. Meanwhile, a kind of In₂O₃ and NiO co-loaded fly ash-based geopolymer was firstly synthesized by the coupling design of semiconductors. The composition, structure and properties of catalysts were characterized by XRF, TG/DSC, FESEM, XRD, FT-IR and UV-Vis. Furthermore, degradation activities of simulated dyeing wastewater, mechanism and reaction dynamics were studied. The results indicated that the pore structure, BET specific surface area and mesopore volume of geopolymer were remarkably improved by adding pore forming agent. The highest degradation rate (95.65%) of magenta green crystals over the 5% In₂O₃ and 1% NiO co-loaded catalyst should ascribe to the semiconductor coupling system of p-n junction generated from In₂O₃ and NiO as well as strong interaction produced between In₂O₃ and PAFAG so that the separation efficiencies of photogenerated electron-hole pairs were improved and the photocatalytic degradation activities of dye were enhanced.