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Novel photocatalytic material and dual-photocatalytic electrode self-biasing pollution control system

A photocatalytic material and pollution control technology, which can be used in catalyst activation/preparation, water pollutants, light water/sewage treatment, etc. Separation from holes, efficient power generation, and the effect of expanding the Fermi level difference to drive electron transfer

Active Publication Date: 2018-04-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] TiO 2 It is the most widely used typical n-type semiconductor photocatalyst, which has stable chemical properties, simple synthesis and low price; but its bandgap width is 3.2eV, it can only be excited by ultraviolet light, and the recombination probability of photogenerated holes and electrons is high, resulting in Reduced photocatalytic efficiency

Method used

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  • Novel photocatalytic material and dual-photocatalytic electrode self-biasing pollution control system
  • Novel photocatalytic material and dual-photocatalytic electrode self-biasing pollution control system
  • Novel photocatalytic material and dual-photocatalytic electrode self-biasing pollution control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] g-C 3 N 4 -Fe 0 -TiO 2 Photocatalytic powder preparation:

[0024] (1) Fe 0 / TiO 2 Preparation: according to Fe 0 with TiO 2 The mass ratio of 0.5% to TiO 2 Add FeSO to the powder 4 ·7H 2 Add O to 50ml of deionized water, ultrasonically disperse for 30min, then pass nitrogen gas for 30min, then add 0.0136g of NaBH 4 Restore under nitrogen atmosphere for 30 minutes, centrifuge and wash several times, and dry at 60°C for later use.

[0025] (2)g-C 3 N 4 / Fe 0 / TiO 2 Preparation: melamine was calcined at 550°C for 4 hours to obtain g-C 3 N 4 Powder, take 1.00g g-C 3 N 4 Add the powder to HCl (18.5wt%) and ultrasonically disperse it fully for 4 hours, add 500ml of deionized water to dilute, centrifuge and wash several times until neutral, then dry at 105°C to obtain g-C 3 N 4 Nanosheets. Weigh the above g-C 3 N 4 The nanosheet powder was dissolved in deionized water, and the concentration was controlled at 1 mg / mL for 6 hours to obtain a uniform g-C ...

Embodiment 2

[0027] With the g-C prepared in embodiment 1 3 N 4 -Fe 0 -TiO 2 The photocatalytic powder and silica sol were mixed and ultrasonically dispersed at a ratio of 1 mg:1 μL to form a uniform suspension, which was evenly coated on the surface of the pretreated stainless steel mesh and then dried naturally.

[0028] Self-bias system WO 3 The preparation method of the photocatalytic cathode is as follows: configure 50ml of 0.34mol / L sodium tungstate aqueous solution, add about 2ml of 3mol / L hydrochloric acid solution and continue to stir until no precipitation occurs, and leave it for 24h to form a gel. Add 15ml 0.15mol / L CTAB to the above gel, ultrasonically disperse for 40min, centrifuge, wash and dry, then bake at 600°C for 2h to prepare WO 3 The powder is ground and passed through a 120-mesh sieve for later use. The prepared catalyst powder and silica sol 1 mg: 1 μL were mixed and ultrasonically dispersed to form a uniform suspension, which was evenly coated on the surface o...

Embodiment 3

[0031] The composition of the reaction system described in Example 2 is the same, and the electric potential is recorded with a computer connected to a data collector under visible light and dark conditions respectively during operation. Figure 5 They are the power generation of the system at pH 2, 5, 7, and 10 respectively. Under neutral conditions, the battery potential is 0.7V. In acidic and alkaline solutions, the power generation effect of the system is further improved to about 0.9V; the reactor battery The potential diagram of the battery under the condition of avoiding light under the condition of pH 2-10 is maintained at about 0.5V, and the stability is better during the operation of pH=2 and 7 ( Image 6 ).

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Abstract

The invention provides a novel photocatalytic material and a dual-photocatalytic electrode self-biasing pollution control system, and belongs to the technical field of sewage disposal and energy source recycling. The ternary composite g-C3N4-FeO-TiO2 photocatalyst with excellent synthesis performance is synthesized with low-price materials, and the absorption of visible light is improved; the heterojunction can promote electronic hole separation and further improve the photocatalytic performance. The g-C3N4-FeO-TiO2 is used as an anode of a photocatalytic self-biasing system and the WO3 photocatalyst is used as a cathode; the structured dual-electrode enlarges the Fermi energy grade difference between electrodes and promote the power generation performance of the photocatalytic self-biasing system. The novel photocatalytic material and the dual-photocatalytic electrode self-biasing pollution control system have the advantages that the novel ternary heterojunction photocatalyst is usedas the anode, the cathode is reasonably matched, the Fermi energy grade difference is enlarged, the self-biasing system with high power generation performance is constructed, treatment of refractory organic wastewater is achieved, and electric energy is efficiently output in a wide pH scale.

Description

technical field [0001] The invention belongs to the technical field of energy and sewage treatment, and relates to a novel ternary heterojunction photocatalytic material applied to a dual photocatalytic electrode self-bias pollution control system to drive and realize electron transfer, and to process refractory organic wastewater while operating in a wide pH range. High-efficiency electric energy output can be realized inside. Background technique [0002] Photocatalytic technology is an environmental treatment technology that combines high efficiency, energy saving, easy operation and many other advantages. The photocatalytic fuel cell developed in recent years is a new type of fuel cell system, which connects the photocatalytic anode and photocatalytic cathode with wires to form a closed circuit. Under the action of light, the semiconductor anode photocatalytic material of the system generates electrons and holes, and the photogenerated holes oxidize and degrade the poll...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J23/30B01J37/16B01J37/08B01J37/03B01J37/02C02F1/30C02F101/34C02F101/36C02F101/38
CPCC02F1/30B01J23/30B01J27/24B01J37/0221B01J37/036B01J37/082B01J37/084B01J37/16C02F2101/308C02F2101/38C02F2101/36C02F2101/34C02F2305/10B01J35/23B01J35/39
Inventor 柳丽芬拉贝张艺臻
Owner DALIAN UNIV OF TECH
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