P-25 TiO_2�Ľṹ��͹�߻��

ժҪ ��XRD��TEM��BET��UV-Vis��շ��Ը��¶ȱ��յ�P-25 TiO2��˱��,��ù�߻��ⱽ�ӵķ�Ӧ,�о��˱��¶ȶ�P-25 TiO2��ṹ��Ӱ��Լ��ṹ��߻��֮��Ĺ�ϵ��,�ȴ��ɵ��TiO2�ľ��ṹ��500�決��ʱ,TiO2Ϊ��ѿ��ʯ��Լ70��30�Ļ쾧,��߻��ⱽ�ӻ��ߡ�P-25 TiO2��߻��Եĸߵ��侧��ṹ��ء�

	Service

	�ѱ��Ƽ��
	��ҵ��
	��ù��
	Email Alert
	RSS
	��
	��
	�δ�ƽ
	��
	�ַ��
	��

�ؼ���� ߻� �� ṹ ��߻��

Abstract�� A series of TiO_2 samples with different ratios of anatase and rutile phases were prepared by calcination.A systematic characterization of these samples was conducted by XRD,TEM,BET and UV-Vis diffuse reflectance spectroscopy.Photocatalytized phenol oxidation was used to discuss the effect of calcination temperature on the crystal phase structure of TiO_2 and to show the relationship between the crystal phase structure of TiO_2 and its photocatalytic activity.The results indicated that treatment transferred the crystal phase structure of TiO_2.Compared with raw P-25 TiO_2(anatase-to-rutile ratio of about 81 to 19),the P-25 TiO_2 sample calcined at 500 ��,with anatase-to-rutile ratio of about 70 to 30,shows higher activity for phenol degradation.The photocatalytic activity of P-25 TiO_2 changes with the crystal phase structure of anatase and rutile crystallites.

Keywords��

Received 2006-03-15; published 2006-03-15

��ñ��:

��;�δ�ƽ;��;�ַ��;��;.P-25 TiO_2�Ľṹ��͹�߻��[J]. ��ѧ��ҵ�빤��, 2006,23(2): 106-109

LIU Jian-jun,HE Dai-ping,CAI Duo-chang,LIN Fa-rong,YU Xiao-peng.Crystal Phase Transfer and Photocatalytic Activity of P-25 TiO_2[J]. Chemcial Industry and Engineering, 2006,23(2): 106-109

[1]	��,��Ⱥ.TiO2-SnO2��Ĥ��Ʊ��߻��ױ��Ļ��[J].�߻�ѧ��,2003,24(4):243-247.
[2]	WANG J A,LIMAS-BALLESTEROS R,L PEZ T,et al.Quantitative determination of titanium lattice defects andsolid-state reaction mechanism in iron-doped TiO2photocatalysts[J].The Journal of Physical Chemistry B,2001,105:9 692-9 698.
[3]	DING Z,LU G Q,GREENFIELD P F.Role of the crystallitephase of TiO2in heterogeneous photocatalysis for phenoloxidation in water[J].The Journal of Physical Chemistry B,2000,104:4 815-4 820.
[4]	SDAFANI A,PALMISANO L,SCHIAVELLO M.Influence ofthe preparation methods of titanium dioxide on thephotocatalytic degradation of phenol in aqueous dispersion[J].Journal of Physical Chemistry.1990,94(2):829-832
[5]	�ﾲ,��,��.�Ʊ��й�߻��ԵĽ��ʯ��ѷ��[J].��ѧѧ��,2003,61(1):74-77.
[6]	BACSA R R,KIWI J.Effect of rutile phase on thephotocatalytic properties of nanocrystalline titania during thedegradation of p-coumaric acid[J].Applied Catalysis B.1998,16:19-29
[7]	BICKLEY R I,GONZALEZ-CARRENO T,LEES J.Astructural investigation of titanium dioxide photocatalysts[J].Journal of Solid State Chemistry.1991,92:178-190
[8]	TADA H,HATTORI A,TOKIHISA Y,et al.A patterned-TiO2/SnO2bilayer type photocatalyst[J].The Journal ofPhysical Chemistry B,2000,104:4 585-4 587.
[9]	�ž��,��,��ά��.��ٽ��﷨�Ʊ��TiO2-ZnO2��ϴ߻��Ա��ӽ��Ĺ�߻��[J].�߻�ѧ��,2003,24(11):831-834.
[10]	CHARY K V R,BHASKAR T,SEELA K K,et al.Characterization and reactivity of molybdenum oxidecatalysts supported on anatase and rutile polymorphs oftitania[J].Applied Catalysis A.2001,208(1-2):291-305