LaNi_xFe_(1-x)O_3钙钛矿光催化降解碱性品红
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摘要
通过溶胶-凝胶法控制合成一系列掺杂型LaNi_xFe_(1-x)O_3(x=0. 1,0. 3,0. 5,0. 7,0. 9)钙钛矿材料,研究其在氙灯条件下对碱性品红降解的效果并解析其降解机理。结合X射线衍射(XRD)、扫描电镜(SEM)、光电子能谱(XPS)等分析测试与光催化降解评价结果,探究复合氧化物的结构性能与催化效能。研究发现,该LaNi_xFe_(1-x)O_3材料在降解碱性品红溶液时均具有良好效果,其中La Ni_(0. 9)Fe_(0. 1)O_3催化效果最好,当Ni的掺杂量较高时具有更大的比表面积,暴露更多的活性位点,催化剂表面含有更多吸附氧O~-/O_2~-物种,有利于降解碱性品红分子,降解率可达到97%,且有稳定高效的重复利用率。
A series of doped perovskite materials of LaNi_xFe_(1-x)O_3( x = 0. 1,0. 3,0. 5,0. 7,0. 9) were synthesized by sol-gel method. The effect of LaNi_xFe_(1-x)O_3 on the degradation of basic fuchsin under xenon lamp was studied and its degradation mechanism was analyzed. Combined with X-ray diffraction( XRD),scanning electron microscopy( SEM),photoelectron spectroscopy( XPS) and photocatalytic degradation evaluation results,the structural properties and catalytic performance of the composite oxide were investigated. It is found that the series of perovskite LaNi_xFe_(1-x)O_3 materials have certain catalytic effects when degrading basic fuchsin solution. La Ni_(0. 9)Fe_(0. 1)O_3 material has the best catalytic effect,the degradation rate can reach 97%,and it has a stable and efficient reuse efficiency. This is because when the doping amount of Ni is higher,the specific surface area is larger,and more active sites are exposed,and the catalyst surface contains more adsorbed oxygen O~-/O_2~-species,which is beneficial to the degradation of basic fuchsin molecules.
A series of doped perovskite materials of LaNi_xFe_(1-x)O_3( x = 0. 1,0. 3,0. 5,0. 7,0. 9) were synthesized by sol-gel method. The effect of LaNi_xFe_(1-x)O_3 on the degradation of basic fuchsin under xenon lamp was studied and its degradation mechanism was analyzed. Combined with X-ray diffraction( XRD),scanning electron microscopy( SEM),photoelectron spectroscopy( XPS) and photocatalytic degradation evaluation results,the structural properties and catalytic performance of the composite oxide were investigated. It is found that the series of perovskite LaNi_xFe_(1-x)O_3 materials have certain catalytic effects when degrading basic fuchsin solution. La Ni_(0. 9)Fe_(0. 1)O_3 material has the best catalytic effect,the degradation rate can reach 97%,and it has a stable and efficient reuse efficiency. This is because when the doping amount of Ni is higher,the specific surface area is larger,and more active sites are exposed,and the catalyst surface contains more adsorbed oxygen O~-/O_2~-species,which is beneficial to the degradation of basic fuchsin molecules.
引文
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[2]王欢.纳米掺杂Ti O2及碱性品红光催化氧化研究[D].成都:四川大学,2004.
[3]Hu J,Ma J,Wang L,et al.Synthesis and photocatalytic properties of La MnO3-graphene nanocomposites[J].Journal of alloys and compounds,2014,583:539-545.
[4]贾坤,魏长平,许洁,等.Sr掺杂对CaMnO3+δ基化合物高温电学性能的影响[J].化工进展,2011,30(5):1065-1068.
[5]Niu T,Liu G L,Chen Y,et al.Hydrothermal synthesis of graphene-La Fe O3composite supported with Cu-Co nanocatalyst for higher alcohol synthesis from syngas[J].Applied Surface Science,2016,364:388-399.
[6]Kumar R D,Thangappan R,Jayavel R.Facile preparation of La Fe O3/r GO nanocomposites with enhanced visible light photocatalytic activity[J].Journal of Inorganic and Organometallic Polymers and Materials,2017,27(4):892-900.
[7]Tang P,Tong Y,Chen H,et al.Microwave-assisted synthesis of nanoparticulate perovskite La Fe O3as a high active visible-light photocatalyst[J].Current Applied Physics,2013,13(2):340-343.
[8]Iervolino G,Vaiano V,Sannino D,et al.Production of hydrogen from glucose by La Fe O3based photocatalytic process during water treatment[J].International Journal of Hydrogen Energy,2016,41(2):959-966.
[9]谢立进,马峻峰,赵忠强,等.半导体光催化剂的研究现状及展望[J].硅酸盐通报,2005,24(6):80-84.
[10]Arandiyan H,Li J,Ma L,et al.Methane reforming to syngas over La NixFe1-xO3(0≤x≤1)mixed-oxide perovskites in the presence of CO2and O2[J].Journal of Industrial and Engineering Chemistry,2012,18(6):2103-2114.
[11]Pecchi G,Reyes P,Zamora R,et al.Surface properties and performance for VOCs combustion of La Fe1-yNiyO3perovskite oxides[J].Journal of Solid State Chemistry,2008,181(4):905-912.
[12]Maneerung,Thawatchai,Kus Hidajat,Sibudjing Kawi."Co-production of hydrogen and carbon nanofibers from catalytic decomposition of methane over La Ni1-xMxO3-αperovskite(where M=Co,Fe and x=0,0.2,0.5,0.8,1)."International Journal of Hydrogen Energy,2015,40(39):13399-13411.
[13]Young S L,Chen Y C,Chen H Z,et al.Effect of the substitutions of Ni3+,Co3+,and Fe3+for Mn3+on the ferromagnetic states of the La0.7Pb0.3MnO3manganite[J].Journal of applied physics,2002,91(10):8915-8917.
[14]Avdeeva L B,Kochubey D I,Shaikhutdinov S K.Cobalt catalysts of methane decomposition:accumulation of the filamentous carbon[J].Applied Catalysis A:General,1999,177(1):43-51.
[15]Li J,Zeng J,Jia L,et al.Investigations on the effect of Cu2+/Cu+redox couples and oxygen vacancies on photocatalytic activity of treated La Ni1-xCuxO3(x=0.1,0.4,0.5)[J].International Journal of Hydrogen Energy,2010,35(23):12733-12740.
[16]Xu L,Xie H,Pu Y,et al.Perovskite semiconductor La(Ni0.75W0.25)O3nanoparticles for visible-light-absorbing photocatalytic material[J].Journal of Nanoparticle Research,2017,19(1):2.