Effects of Calcination Condition on Photocatalytic Properties of Nano-TiO2/Opal Composite and Its Mechanism

doi:10.15541/jim20130575

Abstract

Abstract:

Nanocrystalline TiO₂ particles immobilized on opal by a hydrolysis precipitation method are used as a novel catalyst in photocatalysis. Effects of crystalline and size, BET specific surface area and porous properties on the photoactivity were investigated by characterizing samples obtained under various calcination temperatures and periods. Results reveal that there is still no evidence of rutile phase in XRD patterns when the calcination temperature increases to 800℃. This indicates that the opal support impedes the phase transformation. The photocatalytic reactivity of this nano-TiO₂/opal composite catalyst was evaluated by degrading Rhodamine B (RhB) under ultraviolet light. The sample calcined at 600℃ for 2 h exhibits the smaller crystalline size and larger specific surface area with a concomitant higher activity of 97.24% for RhB degradation by 4 h irradiation under 250 W Hg lamp.

Key words: opal, TiO2, calcination, photocatalysis

CLC Number:

TD98

WANG Bin, ZHENG Shui-Lin, WEN Ming, ZHANG Guang-Xin. Effects of Calcination Condition on Photocatalytic Properties of Nano-TiO₂/Opal Composite and Its Mechanism[J]. Journal of Inorganic Materials, 2014, 29(8): 795-800.

Figures/Tables 8

References 22

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Sample	Calcination	Crystalline size<br/>D₍₁₀₁₎/nm	Surface area S_BET/(m²•g^-1)	Pore diameter W/nm	Pore volume V_m/(cm³•g^-1)
	Temperature/℃	Time/h
TO-0	-	-	-	106.4	5.3	0.191
TO-5-2	500	2	12.412	73.8	6.6	0.166
TO-6-2	600	2	9.902	89.7	6.2	0.165
TO-7-2	700	2	13.316	73.8	6.5	0.146
TO-8-2	800	2	19.271	67.1	6.7	0.147

Sample	Calcination	Crystalline size<br/>D₍₁₀₁₎/nm	Surface area S_BET/(m²•g^-1)	Pore diameter W/nm	Pore volume V_m/(cm³•g^-1)
	Temperature/℃	Time/h
TO-0	-	-	-	106.4	5.3	0.191
TO-5-2	500	2	12.412	73.8	6.6	0.166
TO-6-2	600	2	9.902	89.7	6.2	0.165
TO-7-2	700	2	13.316	73.8	6.5	0.146
TO-8-2	800	2	19.271	67.1	6.7	0.147

Sample	Calcination	Crystalline size<br/>D₍₁₀₁₎/nm	Surface area S_BET/(m²•g^-1)	Pore diameter W/nm	Pore volume V_m/(cm³•g^-1)
	Temperature/℃	Time/h
TO-6-1	600	1	9.581	85.2	7.3	0.204
TO-6-2	600	2	9.902	89.7	6.2	0.165
TO-6-3	600	3	10.890	84.8	6.9	0.188
TO-6-4	600	4	9.872	86.5	7.4	0.211

Sample	Calcination	Crystalline size<br/>D₍₁₀₁₎/nm	Surface area S_BET/(m²•g^-1)	Pore diameter W/nm	Pore volume V_m/(cm³•g^-1)
	Temperature/℃	Time/h
TO-6-1	600	1	9.581	85.2	7.3	0.204
TO-6-2	600	2	9.902	89.7	6.2	0.165
TO-6-3	600	3	10.890	84.8	6.9	0.188
TO-6-4	600	4	9.872	86.5	7.4	0.211

Effects of Calcination Condition on Photocatalytic Properties of Nano-TiO₂/Opal Composite and Its Mechanism

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