GC3N4氧化铝基异质结合成及其可见光催化活研究.docx

河北科技大学硕士学位论文 11 万方数据  Abstract ===§===≈==============≈=；====；自=≈=；=；：= ： ： ==： Abstract With the ever-increasing deterioration of environmental associated with economic growth，semiconductor photocatalysis technique has aroused much attention in degrading pollutants due to its potential utilization for clean,safe，and inexhaustible solar energY in the past few decades．The development of visible-light-driven photocatalysts is an essential prerequisite for practical application．Recently,graphite carbon nitfide(g．C3N4) has attacked great interest because of its inexpensive and relative narrow band gap of 2．70 eV．However,similar to other narrow-band-gap semiconductors，g．C3N4 also suffers from high recombination rate of photo—induced charge carriers and low quantum yieId．In。rder to enhance the photocatalytic ability of pristine g-C3N4，many strategies have been employed．Among these methods，coupling g-c3N4 with other semiconductors is aIl effective measure． A new photocatalyst of MgAl204 nanopowders containing amorphous parts Was developed by solution combustion method．Then，coupled g．c3N4 with amorphoUS MgAl204 via one-step combustion method．he photocatalytic performances of the composites are evaluated by the degradation of rhodamine B咖)and methylene blue (MB)． Based Oll the principle of amorphous MgA[204 AI．O bond length is shortened，and forbidden band width is reduced．Mesoporous amorphous Y．A1203 with high surface area(1 59 m2／g)is prepared via precipitation method．The as．synthesized A1203 exhibits optical absorption ability in ultraviolet region．A1203 defect sites call transfer photo。generated electrons and is used as active component to be combined with g-C3N4 to form effective heterostructured photocatalysts．Tllis heterojunction structure is contirmed by XRD，SEM，element map，TEM，HRTEM，FT-IR,and XPS measurements，The resuIts confirmed its heterostructures．The photocatalytic performances of the composites ale evaluated by the degradation of rhodamine B(RhB)