CeO_2负载多孔碱激发钢渣基催化剂的制备及其光催化性能

固体废弃物高附加值利用是资源可持续发展的重要途径之一,创新性的提出了以丙烯酸树脂乳液为孔形成剂,对碱激发钢渣基胶凝材料的孔结构进行调变,制备出新型多孔碱激发钢渣基胶凝材料,采用初湿浸渍法合成了一种新型的CeO_2负载的多孔钢渣基催化剂。利用XRF,XRD,BET,UV-Vis DRS等手段对光催化剂的组成、结构及光谱性能进行了表征,评价了其光催化分解水制氢活性。结果表明:孔形成剂的加入,改变了碱激发钢渣基胶凝材料的孑L结构,其介孔体积增加了70.27%,负载8 Wt%CeO_2的光催化剂介孔体积增加了144.14%。在模拟太阳光源辐照6 h后,负载8 Wt%CeO_2的光催化剂的最高产氢活性(7 653μmol·g~(-1))和产氢速率[1 275.5μmol·(g·h)~(-1)]归因于介孔体积增加了水分子的传质速率以及高分散的CeO_2活性组分与载体中FeO形成的耦合半导体促进了光生电子-空穴对的高效分离。

Preparation and Photocatalytic Activity of CeO2 Loaded Porous Alkali-Activated Steel Slag-Based Catalyst

High value-added utilization of solid wastes is one of the important ways of sustainable development .A novel pore size-controlled alkali-activated steel slag-based cementitious material (PASSCM) was synthesized by adjusting the content of pore forming agent of acrylic resin emulsion .Meanwhiel,a new type of porous steel slag-based catalyst loaded CeO2 was prepared via incipient wetness impregnation method in the paper .The composition,structure and optical properties of photocatalysts were characterized with XRF,XRD,BET and UV-Vis DRS .Meanwhile,the photocatalytic performance of hydrogen production from water was e valuated .The results showed that adding pore-forming agent changed the pore structure and the mesoporous volume increased by 70.27％ of alkali-activated steel slag-based cementitious material .The mesoporous volume increased by 144.14％ in photocatalyst loaded 8 Wt％ CeO2 .In the simulated solar source irradiat ion for 6 h,the photocatalyst loaded 8wt％CeO2 exhibiting the highest photocatalytic hydrogen production activity (7 653 μmol·g-1) and hydrogen generation rate [1 2755 μmol·(g·h)-1],which were attributed to mesoporous volume increases the mass transfer rate of the water molecules,and in the formation of the coupled semiconductors,the high dispersion of the CeO2 active component and the FeO in the carrier promoted the high efficiency separation o f the photogenerated electron-hole pairs .