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Copper and bismuth co-doped nano titanium dioxide photocatalyst and preparation and application thereof

A nano-titanium dioxide and photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, hydrocarbon production from carbon oxides, etc., can solve the problems affecting the effective utilization of sunlight and solar energy utilization. It can solve the problems of low and high carrier recombination rate, and achieve the effect of effective utilization and resource utilization, large application potential, and high photon efficiency.

Active Publication Date: 2014-07-30
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, as a photocatalytic material, TiO 2 It has a wide band gap (3.2 eV), has no response in the visible light range, can only absorb ultraviolet light with a wavelength less than 387 nm, and has a low utilization rate of solar energy (about 4%); the recombination rate of carriers is high, and the light quantum yield Low, resulting in low photocatalytic efficiency, these two defects affect its effective use of sunlight

Method used

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  • Copper and bismuth co-doped nano titanium dioxide photocatalyst and preparation and application thereof
  • Copper and bismuth co-doped nano titanium dioxide photocatalyst and preparation and application thereof
  • Copper and bismuth co-doped nano titanium dioxide photocatalyst and preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 2.0g nano-TiO 2 The powder was placed in 75 mL of 10mol / L KOH solution, and 0.05 g CuCl was added to it 2 with 0.2 g Bi(NO 3 ) 3 , stirred at room temperature for 20 min to obtain a mixed suspension, transferred the obtained mixed suspension to a 100 mL stainless steel reactor, placed the reactor in a microwave digestion apparatus, and reacted at a constant temperature of 120 °C for 6 h, cooled, poured off the supernatant, and used Wash with ionic water to neutrality, then wash with 0.1 mol / L nitric acid solution and deionized water, centrifuge filter and dry the obtained precipitate at 90 °C for 8 h to obtain a powder sample; calcinate the obtained powder sample at 400 °C for 2 h to obtain copper , bismuth co-doped nano-TiO 2 Photocatalyst, in terms of mole fraction, the doping amount of copper is 1.1%, the doping amount of bismuth is 2.4%, the crystal form is anatase type, the shape is nanotube, the length is about 200 nm, and the diameter is 8 nm.

[0031] Visibl...

Embodiment 2

[0033] 3.0g nano-TiO 2 The powder was placed in 80 mL of 12mol / L NaOH solution, and 0.02 g Cu(NO 3 ) 2 with 0.12 g Bi(Ac) 3 , stirred at room temperature for 30 min to obtain a mixed suspension, which was transferred to a 100 mL stainless steel reactor, and the reactor was placed in a microwave digestion apparatus at a constant temperature of 130 °C for 8 h. Wash with water until neutral, then wash with 0.05 mol / L hydrochloric acid solution and deionized water, centrifuge and dry at 80 °C for 10 h to obtain a powder sample; calcinate the obtained powder sample at 500 °C for 1 h to obtain copper and bismuth co-doped Nano TiO 2 Photocatalyst, in mole fraction, wherein the doping amount of copper is 0.3%, the doping amount of bismuth is 0.8%, the crystal form is anatase type, the shape is nanobelt, the length is about 500 nm, and the diameter is 6 nm.

[0034] Add 100 mL of 0.01 mol / L Na to the reactor 2 CO 3 solution and 0.1 g of the copper-bismuth co-doped nano-TiO prepar...

Embodiment 3

[0036] 5.0gTiO 2 The colloid was placed in 100 mL of 15mol / L KOH solution, and 0.08 g CuSO 4 with 0.66 g BiCl 3 , stirred at room temperature for 15 min to obtain a mixed suspension, which was transferred to a 150 mL stainless steel reactor, and the reactor was placed in a microwave digestion apparatus at a constant temperature of 150 °C for 5 h. Wash with water until neutral, then wash with 0.2 mol / L nitric acid solution and deionized water, centrifuge and dry at 95 °C for 7 h to obtain a powder sample; calcinate the obtained powder sample at 450 °C for 1.5 h to obtain copper and bismuth co-doped Nano TiO 2 Photocatalyst, in mole fraction, wherein the doping amount of copper is 0.5%, the doping amount of bismuth is 3.4%, the crystal form is anatase type, the shape is nanowire, the length is about 1.0 μm, and the diameter is 5 nm.

[0037] Add 100 mL of 0.01 mol / L Na to the reactor 2 CO 3 solution and 0.1 g of the copper-bismuth co-doped nano-TiO prepared above 2 Photoca...

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Abstract

The invention belongs to the technical field of a nano titanium dioxide photocatalyst, and particularly relates to a copper and bismuth co-doped nano titanium dioxide photocatalyst and preparation and application thereof. In the photocatalyst, in molar fraction, the doping amount of copper is 0.2-3.0%, and the doping amount of titanium is 0.5-5.0%. The copper and bismuth co-doped nano titanium dioxide photocatalyst disclosed by the invention is in an anatase type, is used for the reaction for preparing methane, methanol, and the like by photocatalytic reduction CO2, has the advantages that the photon efficiency is high, specific surface area is large, and CO2 adsorption ability is strong, and simultaneously, has visual photocatalytic activity and high sunlight utilization rate.

Description

technical field [0001] The invention belongs to the technical field of nano-titanium dioxide catalysts, and in particular relates to a copper-bismuth co-doped nano-titanium dioxide photocatalyst and its preparation and application. Background technique [0002] In recent decades, the environmental pollution caused by waste discharge has gradually attracted the attention of the world, such as CO 2 Global warming caused by excessive emissions of greenhouse gases. Humans emit 24 billion tons of CO every year 2 to the atmosphere, of which 22 billion tons are due to the burning of fossil fuels. Currently, reducing CO 2 There are two main development trends: one is to reduce CO2 from the source 2 emissions, such as the use of hydrogen, electricity and other green energy; the second is the CO 2 captured and converted into carbon-containing organic matter. According to the current technology level, it is more difficult to develop green energy than the latter, so how to effecti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/843C07C9/04C07C1/02C07C31/04C07C31/08C07C29/159
CPCY02P20/52
Inventor 杨娟戴俊张会菊
Owner HENAN POLYTECHNIC UNIV
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