高等学校化学学报
高等學校化學學報
고등학교화학학보
CHEMICAL JOURNAL OF CHINESE UNIVERSITIES
2015年
6期
1194-1201
,共8页
李卫兵%冯昌%岳继光%华方霞%补钰煜
李衛兵%馮昌%嶽繼光%華方霞%補鈺煜
리위병%풍창%악계광%화방하%보옥욱
分级结构TiO2%磷酸银%可见光催化%界面效应%异质结
分級結構TiO2%燐痠銀%可見光催化%界麵效應%異質結
분급결구TiO2%린산은%가견광최화%계면효응%이질결
Hierarchical TiO2%Ag3 PO4%Visible-light photocatalysis%Interface effect%Heterojunction
制备了具有分级结构的海胆状TiO2纳米材料,并通过原位沉积法将可见光响应的Ag3 PO4纳米颗粒沉积到TiO2的纳米分级结构上,合成了具有高效稳定可见光催化性能的系列TiO2分级结构/Ag3 PO4复合材料,对比测试了系列材料对罗丹明B( RhB)的光催化降解性能。结果表明, TiO2分级结构/Ag3 PO4复合材料光催化性能明显高于纯相的Ag3 PO4光催化剂,同时也明显优于TiO2( P25)/Ag3 PO4复合光催化剂,其中分级结构TiO2与Ag3 PO4摩尔比为1∶1的复合材料具有最强的光催化性能,在可见光照射6 min内可实现RhB的完全脱色。分析结果表明,与纳米颗粒TiO2相比,具有海胆状纳米结构的TiO2可为Ag3 PO4的负载提供更多的担载位点,增加TiO2和Ag3 PO4的接触面积,进而提升Ag3 PO4光激发产生的光生电子-空穴的分离效率。同时在光降解过程中, Ag3 PO4表面存在的少量Ag+会逐渐还原成单质Ag0,通过Ag0的等离子体共振效应,可增加对光子的吸收转换能力,从而进一步提高该复合材料光催化降解染料的性能。
製備瞭具有分級結構的海膽狀TiO2納米材料,併通過原位沉積法將可見光響應的Ag3 PO4納米顆粒沉積到TiO2的納米分級結構上,閤成瞭具有高效穩定可見光催化性能的繫列TiO2分級結構/Ag3 PO4複閤材料,對比測試瞭繫列材料對囉丹明B( RhB)的光催化降解性能。結果錶明, TiO2分級結構/Ag3 PO4複閤材料光催化性能明顯高于純相的Ag3 PO4光催化劑,同時也明顯優于TiO2( P25)/Ag3 PO4複閤光催化劑,其中分級結構TiO2與Ag3 PO4摩爾比為1∶1的複閤材料具有最彊的光催化性能,在可見光照射6 min內可實現RhB的完全脫色。分析結果錶明,與納米顆粒TiO2相比,具有海膽狀納米結構的TiO2可為Ag3 PO4的負載提供更多的擔載位點,增加TiO2和Ag3 PO4的接觸麵積,進而提升Ag3 PO4光激髮產生的光生電子-空穴的分離效率。同時在光降解過程中, Ag3 PO4錶麵存在的少量Ag+會逐漸還原成單質Ag0,通過Ag0的等離子體共振效應,可增加對光子的吸收轉換能力,從而進一步提高該複閤材料光催化降解染料的性能。
제비료구유분급결구적해담상TiO2납미재료,병통과원위침적법장가견광향응적Ag3 PO4납미과립침적도TiO2적납미분급결구상,합성료구유고효은정가견광최화성능적계렬TiO2분급결구/Ag3 PO4복합재료,대비측시료계렬재료대라단명B( RhB)적광최화강해성능。결과표명, TiO2분급결구/Ag3 PO4복합재료광최화성능명현고우순상적Ag3 PO4광최화제,동시야명현우우TiO2( P25)/Ag3 PO4복합광최화제,기중분급결구TiO2여Ag3 PO4마이비위1∶1적복합재료구유최강적광최화성능,재가견광조사6 min내가실현RhB적완전탈색。분석결과표명,여납미과립TiO2상비,구유해담상납미결구적TiO2가위Ag3 PO4적부재제공경다적담재위점,증가TiO2화Ag3 PO4적접촉면적,진이제승Ag3 PO4광격발산생적광생전자-공혈적분리효솔。동시재광강해과정중, Ag3 PO4표면존재적소량Ag+회축점환원성단질Ag0,통과Ag0적등리자체공진효응,가증가대광자적흡수전환능력,종이진일보제고해복합재료광최화강해염료적성능。
Urchin-like TiO2 nanomaterial with hierarchical structure(PTHSs) was prepared, then Ag3PO4 nanomaterial with visible-light response was deposited on the hierarchical TiO2 by simple deposition precipitation method, thus a series of PTHSs/Ag3 PO4 composites with efficient visible-light photocatalytic per-formance and stability was synthesized. The photocatalytic performance of the PTHSs/Ag3 PO4 composites for degrading Rhodamine B( RhB) was analyzed. The results show that the photocatalytic performance of PTHSs/Ag3PO4 composite is significantly superior to that of pure Ag3PO4 and that of TiO2(P25)/Ag3PO4 composite. The composite with a PTHSs/Ag3 PO4 molar ratio of 1∶1 showed the best photocatalytic performance and it could decolorize the RhB completely in 6 min under visible light illumination. This is because that the urchin-like TiO2 nanomaterial can provide more load sites than TiO2 nanoparticle for loading Ag3 PO4 . And the hierarchical TiO2 can also improve the contact between the surfaces of TiO2 and Ag3 PO4 so that the separated efficiency of photo-generated electrons-holes by Ag3 PO4 is improved. Meanwhile during the photodegradation process, a little Ag+ on the surface of Ag3 PO4 are gradually reduced to Ag0 , by the plasma resonace effect of which, the absorption and conversion capability of the composite for photon are enhanced and the photocataly-tic performance of the composite material for degrading dyes is further enhanced.
