三维立体石墨烯/多孔黑色TiO_2复合材料的制备及其光催化性能
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摘要
采用水热还原法制备黑色多孔TiO_2(PBT)。以PBT和氧化石墨烯为原料,经一步水热合成三维立体石墨烯(RGO)/PBT。通过XRD、SEM、TEM、BET以及DRS等对复合材料的物相、颗粒粒径、形貌及比表面积进行了表征,研究了该复合材料在可见光下对罗丹明B(RhB)的光催化降解活性。结果表明,Ti~(3+)的存在大大提高了可见光的吸收;所制备的RGO/PBT复合材料的可见光催化活性均高于PBT;当RGO掺杂量为1%时制备的催化剂具有最高的光催化性能。
A facile hydrothermal approach has been developed to prepare porous black TiO_2(PBT)nanocrystals.Three-dimensional graphene composites(RGO)/PBT were synthesized by one-step hydrothermol method using graphene oxide and PBT as raw materials.The crystal structure,particle size,morphology and specific surface area of RGO/PBT composites were characterized by XRD,SEM,TEM,BET and DRS.The photocatalytic activity of the prepared composites was evaluated in terms of degradation of rhodamine B(RhB).The results showed that the presence of Ti~(3+) greatly enhanced the absorption efficiency of composites to visible light.The photocatalytic activity of RGO/PBT composites under visible light was higher than that of PBT.With RGO dosage of 1%,the derived composites had the highest photocatalytic activity.
A facile hydrothermal approach has been developed to prepare porous black TiO_2(PBT)nanocrystals.Three-dimensional graphene composites(RGO)/PBT were synthesized by one-step hydrothermol method using graphene oxide and PBT as raw materials.The crystal structure,particle size,morphology and specific surface area of RGO/PBT composites were characterized by XRD,SEM,TEM,BET and DRS.The photocatalytic activity of the prepared composites was evaluated in terms of degradation of rhodamine B(RhB).The results showed that the presence of Ti~(3+) greatly enhanced the absorption efficiency of composites to visible light.The photocatalytic activity of RGO/PBT composites under visible light was higher than that of PBT.With RGO dosage of 1%,the derived composites had the highest photocatalytic activity.
引文
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[2]ASAHI R,MIKAWA T,OHWAKI T,et al.Visible light photocatalysis in nitrogen-doped titanium oxides[J].Science,2001,293(5528):269-271.
[3]AMANO F,NAKATA M,YAMAMOTO A,et al.Effect of Ti 3+ions and conduction band electrons on photocatalytic and photoelectrochemical activity of rutile titania for water oxidation[J].Journal of Physical Chemistry C,2016,120(12):6467-6474..
[4]ZHANG Z K,BAI M L,SUO D Z,et al.Plasma electrolysis synthesis of TiO2nano/microspheres with optical absorption extended into the infrared region[J].Chemical Communications,2011,47(29):8439-8441.
[5]KUZNETSOV A I,KAMENEVA O,BITYURINN,et al.Laser-induced photopatterning of organicinorganic TiO2-based hybrid materials with tunable interfacial electron transfer[J].Physical Chemistry Chemical Physics,2009,11(8):1248-1257.
[6]LOANNIDOU E,LOANNIDI A,FRONTISTIS Z,et al.Correlating the properties of hydrogenated titania to reaction kinetics and mechanism for the photocatalytic degradation of bisphenol A under solar irradiation[J].Applied Catalysis B:Environment,2016,188:65-76.
[7]ZHANG H,LV X J,WANG Y,et al.P25-graphene composite as a high performance photocatalyst[J].ACS Nano,2010,4(1):380-386.
[8]YANG S,SUN Y,CHEN L,et al.Porous iron oxide ribbons grown on graphene for high-performance lithium storage[J].Scientific Reports,2012,2(22):427.