氢氧根调制氯氧化铋的表面结构及光催化活性
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摘要
使用NaOH溶液处理BiOCl合成了BiOCl/Bi_2O_3复合材料,并对其光催化性能进行了研究。分别用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见(UV-vis)吸收光谱、阻抗谱(IS)和光致发光(PL)光谱表征样品。以BiOCl/Bi_2O_3复合材料为催化剂,以氙灯为光源,对罗丹明B(RhB)溶液进行了光催化降解试验。研究结果表明:BiOCl/Bi_2O_3复合材料在350～500 nm有较强的吸收能力,其微观形貌由片状结构和棒状结构组成,有较快的电子转移速度和较低的PL强度。当NaOH溶液的浓度为10.00 mol/L时,35/65 Bi OCl/Bi_2O_3复合材料对RhB的降解率在光照50 min后为67.3%。
BiOCl/Bi_2O_3 composites were synthesized by the treatment of BiOCl with NaOH solution and its photocatalytic properties were studied. The samples were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),ultraviolet-visible( UV-vis) absorption spectroscopy,impedance spectroscopy( IS)and photoluminescence( PL) spectroscopy. The photocatalytic degradation of rhodamine B( Rh B) solution over BiOCl/Bi_2O_3 composite was studied by using high pressure xenon lamp as light source. The result shows that the BiOCl/Bi_2O_3 composite has strong obsorption in 350 ～ 500 nm. The composite has the micro morphology of lamellar-rod structure,the faster electron transfer rate and lower PL strength. When the concentration of NaOH solution is 10. 00 mol/L,the degradation rate of Rh B photocatalyzed by 35/65 BiOCl/Bi_2O_3 composite is 67.3% at 50 min.
BiOCl/Bi_2O_3 composites were synthesized by the treatment of BiOCl with NaOH solution and its photocatalytic properties were studied. The samples were characterized by X-ray diffraction( XRD),scanning electron microscopy( SEM),ultraviolet-visible( UV-vis) absorption spectroscopy,impedance spectroscopy( IS)and photoluminescence( PL) spectroscopy. The photocatalytic degradation of rhodamine B( Rh B) solution over BiOCl/Bi_2O_3 composite was studied by using high pressure xenon lamp as light source. The result shows that the BiOCl/Bi_2O_3 composite has strong obsorption in 350 ～ 500 nm. The composite has the micro morphology of lamellar-rod structure,the faster electron transfer rate and lower PL strength. When the concentration of NaOH solution is 10. 00 mol/L,the degradation rate of Rh B photocatalyzed by 35/65 BiOCl/Bi_2O_3 composite is 67.3% at 50 min.
引文
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[21]WANG L,SHANG J,HAO W,et al.A dye-sensitized visible light photocatalyst-Bi24O31Cl10[J].Scientific reports,2014,4(2):7384.
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[3]崔玉民.光催化技术在降解无机含氮污染物方面的应用[J].河南科技大学学报(自然科学版),2005,26(4):95-98.
[4]XIE H,LI Y Z,JIN S F,et al.Facile fabrication of 3D-ordered macroporous nanocrystalline iron oxide films with highly efficient visible light induced photocatalytic activity[J].The journal of physical chemistry c,2010,114(21):9706-9712.
[5]WANG X C,MAEDA K,THOMAS A,et al.A metal-free polymeric photocatalyst for hydrogen production from water under visible light[J].Nature materials,2009,8(1):76-80.
[6]XIA J X,YIN S,LI H M,et al.Self-assembly and enhanced photocatalytic properties of Bi OI hollow microspheres via a reactable ionic liquid[J].Langmuir,2011,27(3):1200-1206.
[7]XIA J X,YIN S,LI H M,et al.Improved visible light photocatalytic activity of sphere-like Bi OBr hollow and porous structures synthesized via a reactable ionic liquid[J].Dalton transactions,2011,40(19):5249-5258.
[8]XIA J X,ZHANG J,YIN S,et al.Advanced visible light photocatalytic properties of Bi OCl micro/nanospheres synthesized via reactable ionic liquids[J].Journal of physics and chemistry of solids,2013,74(2):298-304.
[9]GAO M C,ZHANG D F,PU X P,et al.Combustion synthesis of Bi OCl with tunable percentage of exposed{001}facets and enhanced photocatalytic properties[J].Journal of the American ceramic society,2015,98(5):1515-1519.
[10]GNAYEM H,SASSON Y.Hierarchical nanostructured 3d flowerlike Bi OClxBr1-xsemiconductors with exceptional visible light photocatalytic activity[J].ACS catalysis,2013,3(2):186-191.
[11]ETOGO A,HU E,ZHOU C,et al.Facile fabrication of mesoporous Bi OCl/(Bi O)2CO3/Bi2O3ternary flower-like heterostructured microspheres with high visible-light-driven photoactivity[J].Journal of materials chemistry a,2015,3:22413-22420.
[12]SUN J G,WU S J,YANG S Z,et al.Enhanced photocatalytic activity induced by sp3to sp2transition of carbon dopants in Bi OCl crystals[J].Applied catalysis b(environmental),2018,221:467-472.
[13]SUN M,ZHAO Q,DU C,et al.Enhanced visible light photocatalytic activity in Bi OCl/Sn O2:heterojunction of two wide band-gap semiconductors[J].RSC advance,2015,5:22740-22752.
[14]JIANG J,ZHAO K,XIAO X Y,et al.Synthesis and facet-dependent photoreactivity of Bi OCl single-crystalline nanosheets[J].Journal of the American chemical society,2012,134(10):4473-4476.
[15]WANG D H,GAO G Q,ZHANG Y W,et al.Nanosheet-constructed porous Bi OCl with dominant{001}facets for superior photosensitized degradation[J].Nanoscale,2012,4:7780-7785.
[16]CAO J,LI X,LIN H,et al.Low temperature synthesis of novel rodlike Bi5O7I with visible light photocatalytic performance[J].Materials letters,2012,76:181-183.
[17]AN H Z,DU Y,WANG T M,et al.Photocatalytic properties of Bi OX(X=Cl,Br,and I)[J].Rare metals,2008,27(3):243-250.
[18]JIANG H Y,LIU J,CHENG K,et al.Enhanced visible light photocatalysis of Bi2O3upon fluorination[J].Journal of physical chemistry c,2013,117:20029-20036.
[19]JIANG H Y,LIU G G,LI M,et al.Efficient organic degradation under visible light byα-Bi2O3with a Cu Ox-assistant electron transfer process[J].Applied catalysis b(environmental),2015,163:267-276.
[20]CHAI S Y,KIM Y J,JUNG M H,et al.Heterojunctioned Bi OCl/Bi2O3,a new visible light photocatalyst[J].Journal of catalysis,2009,262(1):144-149.
[21]WANG L,SHANG J,HAO W,et al.A dye-sensitized visible light photocatalyst-Bi24O31Cl10[J].Scientific reports,2014,4(2):7384.