pH对植物还原法制备钯颗粒形貌的影响
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摘要
利用银杏叶提取液为还原剂,制备钯单质,考察了反应液不同pH对钯颗粒形貌的影响。首先,采用X射线衍射、透射电镜对制备的钯单质颗粒进行表征与分析,证明钯单质生成。其次,通过扫描电镜着重考察钯颗粒微米尺度的形貌情况。结果表明,改变反应液的pH可以调控钯颗粒的尺寸和形貌,生成的钯颗粒具有球状、线状、三角形等规则几何状形貌,并且pH为酸性时有利于制备线状钯颗粒,pH为碱性时有利于制备球状钯颗粒,pH为中性时有利于制备规则几何形状、尺寸较小的钯颗粒。
The effect of different pH value on the morphology of palladium particles was investigated by using Ginkgo biloba extract as reducing agent.Firstly,the prepared palladium simple particles were characterized by X-ray diffraction and transmission electron microscopy.Secondly,the morphology of particles was investigated by scanning electron microscopy.The results showed that the pH value of the reaction solution can control the size and morphology of particles.The results showed that the size and morphology can be controlled by changing the pH of the reaction solution.The formed palladium particles had spherical,linear,triangular and other regular geometric shapes.When the pH was acidic,it was advantageous to prepare linear particles.When the pH was alkaline,it was advantageous to prepare spherical particles.When the pH was neutral,it was advantageous to prepare regular shape and smaller size palladium particles.
The effect of different pH value on the morphology of palladium particles was investigated by using Ginkgo biloba extract as reducing agent.Firstly,the prepared palladium simple particles were characterized by X-ray diffraction and transmission electron microscopy.Secondly,the morphology of particles was investigated by scanning electron microscopy.The results showed that the pH value of the reaction solution can control the size and morphology of particles.The results showed that the size and morphology can be controlled by changing the pH of the reaction solution.The formed palladium particles had spherical,linear,triangular and other regular geometric shapes.When the pH was acidic,it was advantageous to prepare linear particles.When the pH was alkaline,it was advantageous to prepare spherical particles.When the pH was neutral,it was advantageous to prepare regular shape and smaller size palladium particles.
引文
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[2]Narayanan R,Elsayed M A.Changing catalytic activity during colloidal platinum nanocatalysis due to shape changes:electron-transfer reaction[J].Journal of the American Chemical Society,2004,126(23):7194-5.
[3]张立德.纳米材料和纳米结构[J].中国科学院院刊,2001,16(6):444-445.
[4]王大志.纳米材料结构特征[J].功能材料,1993(4):303-305.
[5]袁哲俊.纳米科学和技术的新进展[J].工具技术,2004,38(9):3-12.
[6]Semagina N,Renken A,Kiwi-Minsker L.Palladium nanoparticle size effect in 1-hexyne selective hydrogenation[J].The Journal of Physical Chemistry C,2007,111(37):13933-13937.
[7]Wilson O M,Knecht M R,Garcia-Martinez J C,et al.Effect of Pd nanoparticle size on the catalytic hydrogenation of allyl alcohol[J].Journal of the American Chemical Society,2006,128(14):4510-1.
[8]Dimitratos N,Porta F,Prati L.Au,Pd(mono and bimetallic)catalysts supported on graphite using the immobilisation method[J].Applied Catalysis A General,2005,291(1):210-214.
[9]Hou Z,Theyssen N,Brinkmann A,et al.Biphasic aerobic oxidation of alcohols catalyzed by poly(ethylene glycol)-stabilized palladium nanoparticles in supercritical carbon dioxide[J].Angewandte Chemie,2010,44(9):1346-1349.
[10]Beller M,Fischer H,Klaus Kühlein,et al.First palladium-catalyzed Heck reactions with efficient colloidal catalyst systems[J].Journal of Organometallic Chemistry,1996,520(1-2):257-259.
[11]Narayanan R,El-Sayed M A.Carbon-supported spherical palladium nanoparticles as potential recyclable catalysts for the Suzuki reaction[J].Journal of Catalysis,2005,234(2):348-355.
[12]Cheong S,Watt J D,Tilley R D.Shape control of platinum and palladium nanoparticles for catalysis[J].Nanoscale,2010,2(10):2045.
[13]Horinouchi S,Yamanoi Y,Yonezawa T,et al.Hydrogen storage properties of isocyanide-stabilized palladium nanoparticles[J].Langmuir,2006,22(4):1880-1884.
[14]Yamauchi M,Ikeda R,Kitagawa H,et al.Nanosize effects on hydrogen storage in palladium[J].Journal of Physical Chemistry C,2016,112(9):3294-3299.
[15]Mubeen S,Zhang T,Yoo B,et al.Palladium nanoparticles decorated single-walled carbon nanotube hydrogen sensor[J].Journal of Physical Chemistry C,2007,111(17):6321-6327.
[16]Tobiska P,Hugon O,Trouillet A,et al.An integrated optic hydrogen sensor based on SPR on palladium[J].Sensors and Actuators B(Chemical),2001,74(1-3):168-172.
[17]倪星元.纳米材料的理化特性与应用[M].北京:化学工业出版社,2006.
[18]徐云龙.纳米材料学概论[M].上海:华东理工大学出版社,2008.
[19]Luo J Y,Wang Y G,Xiong H M,et al.Ordered mesoporous spinel LiMn2O4by a soft-chemical process asa cathode material for lithium-ion batteries[J].Chemistry of Materials,2007,19(19):4791-4795.
[20]Lim B,Jiang M J,Tao J,et al.Shape-Controlled synthesis of Pd nanocrystals in aqueous solutions[J].Advanced Functional Materials,2010,19(2):189-200.
[21]Huang X,Tang S,Mu X,et al.Freestanding palladium nanosheets with plasmonic and catalytic properties[J].Nature Nanotechnology,2011,6(1):28-32.
[22]Huang X,Zheng N.One-pot,high-yield synthesis of 5-fold twinned Pd nanowires and nanorods[J].Journal of the American Chemical Society,2009,131(13):4602-4603.
[23]Huang X,Tang S,Zhang H,et al.Controlled formation of concave tetrahedral/trigonal bipyramidal palladium nanocrystals[J].Journal of the American Chemical Society,2009,131(39):13916-13917.
[24]Xiong Y,Mclellan J M,Chen J,et al.Kinetically controlled synthesis of triangular and hexagonal nanoplates of palladium and their SPR/SERS properties[J].Journal of the American Chemical Society,2005,127(48):17118.
[25]Xiong Y,Cai H,Wiley B J,et al.Synthesis and mechanistic study of palladium nanobars and nanorods[J].Journal of the American Chemical Society,2007,129(12):3665-75.
[26]Mohanty A K,Misra M,Vivekanandhan S,et al.Soybean(glycine max)leaf extract based green synthesis of palladium nanoparticles[J].Journal of Biomaterials &Nanobiotechnology,2011,03(1):6.
[27]孙道华,李清彪,贾立山,等.贵金属纳米颗粒及其催化剂的生物还原制备技术[J].现代化工,2009,29(2):32-35.
[28]张锋,傅吉全.芳樟叶提取液还原制备钯纳米颗粒的研究[J].化工新型材料,2014(1):45-47.
[29]张锋,傅吉全.银杏叶提取液还原制备钯纳米颗粒的研究[J].化工新型材料,2013,41(8):52-55.
[30]秦聪丽.植物还原法制备金属纳米颗粒的研究[D].北京:北京服装学院,2016.
[31]高艺羡.银纳米线的植物还原法制备及其还原—保护成分的研究[D].厦门:厦门大学,2012.