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Preparation of Cu2O/TNTs (TiO2 nanotubes) heterojunction nano composite material and CO2 photoreduction method

A nanocomposite material and heterojunction technology, which is applied in the field of preparation of Cu2O/TNTs heterojunction nanocomposite materials, can solve the problems of low photocatalytic efficiency and unutilized visible light, and achieve low preparation cost and good photoreduction. The ability of CO2, the effect of simple materials

Inactive Publication Date: 2013-07-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006]However, TiO2 has a wide band gap (Eg=3.0-3.2 eV) which determines that it can only be This part of light energy only accounts for 3-4% of the total energy, and about 40% of visible light has not been utilized
At the same time, the recombination of photogenerated electrons and holes in the catalyst is also the reason for the low photocatalytic efficiency of TiO2

Method used

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  • Preparation of Cu2O/TNTs (TiO2 nanotubes) heterojunction nano composite material and CO2 photoreduction method
  • Preparation of Cu2O/TNTs (TiO2 nanotubes) heterojunction nano composite material and CO2 photoreduction method
  • Preparation of Cu2O/TNTs (TiO2 nanotubes) heterojunction nano composite material and CO2 photoreduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1) Pretreatment of titanium sheet

[0045] A titanium sheet with a size of 3 cm × 3 cm was ultrasonicated in acetone and ethanol solutions for 15 min, air-dried, and then immersed in HF:HNO 3 :H 2 O = 1:4:5 (volume ratio) mixed acid for 30 s, then diluted with water and removed the mixed acid solution, and finally cleaned with deionized water. Put the treated titanium sheet in air to dry, the surface of the treated titanium sheet is clean and bright without impurities.

[0046] 2), using one-step anodic oxidation method to prepare TiO 2 nanotube array

[0047] Titanium sheets and graphite electrodes are respectively connected to the positive and negative poles of the DC stabilized power supply, glycerol, 1wt% NH 4 F (mass fraction) and 15vol% H 2 O (volume fraction) solution is the electrolyte, and a DC voltage of 25V is applied. After 2 h of reaction, the sample was calcined in a tube furnace at 450 °C for 3 h and then cooled to room temperature to obtain TiO 2 ...

Embodiment 2

[0053] 1), pretreatment of titanium sheet (same as embodiment 1)

[0054] 2), using one-step anodic oxidation method to prepare TiO 2 Nanotube array (same as embodiment 1)

[0055] 3) Preparation of Cu by electrochemical deposition 2 O / TNTs Heterojunction Nanocomposites

[0056] at 3 mol L ?1 Dissolve 0.4 mol·L in the lactic acid solution ?1 CuSO 4 And adjust the pH to 11.0 to obtain the electrolyte. In the three-electrode system with TNTs as the working electrode, control the electrochemical deposition parameters: the temperature is 25 ℃, the deposition potential is -0.8 V, the deposited charge is 1.0 C, and Cu 2 O nanoparticles were electrodeposited into TNTs. After the reaction, wash with deionized water, dry, and anneal at 200 °C for 10 min to obtain Cu 2 O / TNTs heterojunction nanocomposites.

[0057] 4), Cu 2 Photoreduction of CO by O / TNTs Heterojunction Nanocomposite 2 gas

[0058] in CO 2 Cu at 1.0 C in 100 mL of distilled water at 50 PSI 2 The O / TNTs heter...

Embodiment 3

[0060] 1), pretreatment of titanium sheet (same as embodiment 1)

[0061] 2), using one-step anodic oxidation method to prepare TiO 2 Nanotube array (same as embodiment 1)

[0062] 3) Preparation of Cu by electrochemical deposition 2 O / TNTs Heterojunction Nanocomposites

[0063] at 3 mol L ?1 Dissolve 0.4 mol·L in the lactic acid solution ?1 CuSO 4 And adjust the pH to 11.0 to obtain the electrolyte. In the three-electrode system with TNTs as the working electrode, control the electrochemical deposition parameters: the temperature is 25 ℃, the deposition potential is -0.8 V, the deposited charge is 1.5 C, and the Cu 2 O nanoparticles were electrodeposited into TNTs. After the reaction, wash with deionized water, dry, and anneal at 200 °C for 10 min to obtain Cu 2 O / TNTs heterojunction nanocomposites.

[0064] 4), Cu 2 Photoreduction of CO by O / TNTs Heterojunction Nanocomposite 2 gas

[0065] in CO 2 Cu at 1.5 C in 100 mL of distilled water at 50 PSI 2 The O / TNTs h...

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Abstract

The invention discloses preparation of a Cu2O / TNTs (TiO2 nanotubes) heterojunction nano composite material and a CO2 photoreduction method. The preparation comprises the following specific steps: preparing TNTs through an anodic oxidation method; in electrolyte of lactic acid containing copper sulfate, controlling electrochemical deposition parameters and performing electrodeposition to deposit Cu2O nanoparticles into the TNTs; and after the reaction is finished, cleaning, drying, and performing annealing treatment to obtain the Cu2O / TNTs heterojunction nano composite material. CO2 gas is converted into methanol through photoreduction by putting the composite material in distilled water and taking high-power pulse laser having a wavelength of 355nm as a light source, the maximum conversion efficiency is about 1.66%, and the maximum photon efficiency of the methanol conversion is about 6.63%. The invention is simple in required equipment, easy to operate, suitable for industrial production and convenient to perform recovery.

Description

technical field [0001] The invention belongs to the field of photocatalytic reduction materials, and specifically designs CO 2 Photoreduced Cu 2 Preparation method of O / TNTs heterojunction nanocomposite. Background technique [0002] In the 21st century, human beings are facing two very serious problems of energy and environment. On the one hand, the excessive combustion of hydrocarbon fuels will cause energy shortages; on the other hand, the CO 2 Emissions are large and increasing year by year, CO 2 The significant increase in emissions has broken the balance of the carbon cycle in nature and caused many environmental pollution problems such as the "greenhouse effect" and acid rain. Therefore, in order to realize the sustainable development of human beings, the effective reduction of CO 2 Concentration and development of new energy sources are major challenges facing mankind. [0003] How to effectively reduce CO 2 The content in the atmosphere has become a new resea...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D9/04B01J23/72B01J21/06B01J37/03B01D53/86B01D53/62
Inventor 姬广斌汪俊逸刘有松
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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