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A symmetrical bifunctional photocatalyst, a dual-chamber photoreactor and a method for photocatalytic reduction of carbon dioxide

A technology of photocatalyst and photoreactor, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical/physical chemical processes that apply energy, etc., can solve the problems of energy input increase, energy loss, etc., and achieve enhanced ability, reduce energy consumption, and facilitate direct application

Active Publication Date: 2018-01-19
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also in this invention, due to the existence of the external circuit, even if the energy input of the whole reaction increases, energy loss may occur in the process of electron transfer

Method used

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  • A symmetrical bifunctional photocatalyst, a dual-chamber photoreactor and a method for photocatalytic reduction of carbon dioxide
  • A symmetrical bifunctional photocatalyst, a dual-chamber photoreactor and a method for photocatalytic reduction of carbon dioxide
  • A symmetrical bifunctional photocatalyst, a dual-chamber photoreactor and a method for photocatalytic reduction of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Symmetrical bifunctional Cu 2 Preparation of O / G / TNA Film Photocatalyst

[0027] A symmetrical bifunctional photocatalyst, including double-sided TiO prepared from pure titanium by two-step anodic oxidation 2 Nanotube array (TNA) film substrate, the surface of the substrate is electrodeposited with a graphene layer, and the thickness of the graphene deposition layer is changed by adjusting the electrochemical parameters, thereby regulating the electron transport in the composite symmetrical bifunctional photocatalyst and improving the photoelectron-hole on the recombination probability; then deposit narrow-bandgap semiconductor nanoparticles on the graphene layer as a photosensitizer, and its preparation process is as follows figure 1 shown, including the following steps:

[0028] (1) Preparation of TNA film substrate: After physical grinding and ultrasonic cleaning, the pure titanium foil was soaked in chemical pickling solution for chemical polishing; then the ti...

Embodiment 2~5

[0036] Embodiment 2,3,4,5 The method for preparing TNA film substrate is the same as embodiment 1, prepares G / TNA substrate and Cu 2 The process of O / G / TNA substrate refers to embodiment 1, and concrete process parameter is shown in Table 1, and corresponding Cu 2 The O / G / TNA substrates are labeled as sample 2, sample 3, sample 4, and sample 5 in sequence.

[0037] Sample 2, sample 3, sample 4, sample 5 are respectively clamped in the middle of the connection port 6 of the double-chamber photoreactor of embodiment 2, 3, 4, 5, and the type of electrolyte solution injected in the anode reaction pool A and the cathode reaction pool B See Table 1.

[0038] Example 2, 3, 4, 5 photocatalytic reduction of CO 2 The process of preparing methanol experiment is the same as in Example 1.

[0039] The technological parameter table of table 1 embodiment 1~5

[0040]

Embodiment 6

[0042] The preparation process of the G / TNA film substrate is the same as that of Example 1.

[0043] CdS is deposited on the surface of G / TNA by hydrothermal precipitation method. The process is: respectively prepare cadmium chloride aqueous solution and thiourea aqueous solution with a concentration of 0.004mol / L, according to cadmium chloride aqueous solution: thiourea aqueous solution (mass ratio ) in a ratio of 1:3 and mixed evenly. The G / TNA membrane substrate was placed vertically in a high-pressure reactor, and a mixed solution of cadmium chloride and thiourea was added, and the sealed reactor was placed in an oven at 170 °C for 6 h. After the reaction, the sample was taken out, washed with distilled water, and then heat-treated at 400 °C for 3 h in an Ar atmosphere to prepare a CdS / G / TNA film substrate.

[0044] The CdS / G / TNA film substrate is clamped in the middle of the connection port 6 of the double-chamber photoreactor, and the photocatalytic reduction of CO 2 ...

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Abstract

The invention discloses a symmetrical dual-function photocatalyst and a corresponding dual-chamber photoreactor, belonging to the technical field of comprehensive utilization of carbon dioxide, wherein the symmetrical dual-function photocatalyst comprises a graphene intermediate electron transport layer deposited on a double-sided TiO2 nanotube array substrate, Redeposited narrow bandgap semiconductor nanoparticles as photosensitizers. The symmetric photocatalyst provided by the present invention extends the photoresponse of the ternary composite photocatalyst to the visible light region through the introduction of the electron transport layer and the photosensitizer component, simultaneously promotes the effective separation of photogenerated electron-hole pairs, and enhances the photoresponse of the composite catalyst. The ability to catalyze CO2 reduction; the double-sided symmetrical ternary composite catalyst is matched with a dual-chamber photoreactor, so that the photocatalytic water oxidation and CO2 reduction reactions are carried out in independent regions, reducing the occurrence of reverse reactions and further improving photocatalytic CO2 recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of carbon dioxide, and in particular relates to a symmetrical double-function photocatalyst, a double-chamber photoreactor and a method for photocatalytically reducing carbon dioxide. Background technique [0002] Energy shortages and carbon dioxide (CO 2 ) caused by the greenhouse effect has become a major threat to social development and people's daily life, but at the same time, because of the abundant reserves of CO 2 It is also an important chemical raw material, how to transform and utilize it efficiently and extensively poses challenges and opportunities for people. However, due to CO 2 Chemically stable in nature, additional energy input is required to activate and convert them into useful compounds. Solar energy is a clean, cheap, and widely distributed renewable energy source, using solar photocatalytic technology to convert CO 2 Reverting to solar fuel is of great ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72B01J27/04B01J23/06B01J23/14C25B1/00C25B3/04B01J19/12C07C31/04C07C29/154C07C29/153C25B3/25
CPCB01J19/122C07C29/153C07C29/154B01J23/06B01J23/14B01J23/72B01J27/04B01J35/004C25B1/55C25B3/25C07C31/04Y02P20/52
Inventor 张丽曹少魁李飞徐慎刚刘应良石军
Owner ZHENGZHOU UNIV
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