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Two-dimensional anatase TiO2/g-C3N4 composite material, as well as preparation method and application thereof

A technology of composite materials and anatase, which is applied in the field of two-dimensional anatase TiO2/g-C3N4 composite materials and its preparation, can solve the problems of inability to exert photocatalytic performance, poor photocatalytic performance, and enlarged band gap , to achieve high-efficiency photocatalytic hydrogen production and photodegradation of organic matter performance, excellent stability, and large lateral size

Active Publication Date: 2017-12-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when applied in the field of photocatalysis, due to factors such as the increase of the forbidden band width caused by the quantum confinement effect and the reduction of light absorption, good photocatalytic performance cannot be exerted; and the two-dimensional TiO reported by the current technology 2 The nanosheets basically belong to the Bronze phase (B phase), which is far inferior to the anatase phase TiO in terms of photocatalytic performance. 2

Method used

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  • Two-dimensional anatase TiO2/g-C3N4 composite material, as well as preparation method and application thereof
  • Two-dimensional anatase TiO2/g-C3N4 composite material, as well as preparation method and application thereof
  • Two-dimensional anatase TiO2/g-C3N4 composite material, as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] A two-dimensional anatase TiO 2 / g -C 3 N 4 The manufacturing process of composite materials is as follows: figure 1 shown, including the following steps:

[0049] 1) Using melamine as the precursor of carbon-nitrogen compounds, calcining at 550°C in an air atmosphere to obtain bulk g-C 3 N 4 ; 100 mg block g-C 3 N 4 , after ultrasonic protonation in 0.5M hydrochloric acid for 6h, add to 40mL ethylene glycol and ultrasonically stir until uniformly dispersed;

[0050] 2) Add 0.2mL of surfactant P123 into 4mL of ethanol and stir for 15min;

[0051] 3) Add 1 mL of tetraisopropyl titanate (TTIP) to 0.6 mL of concentrated hydrochloric acid under ice-water bath and magnetic stirring, then continue to stir for 15 min, and add the obtained solution to ethanol containing surfactant obtained in step 2). solution, continue to stir for 30min;

[0052] 4) Add the product obtained in step 3) to the solution obtained in step 1), stir it evenly with ultrasonic waves, then tran...

Embodiment 2

[0058] A two-dimensional anatase TiO 2 / g -C 3 N 4 The preparation of composite material, method is with embodiment 1, difference is:

[0059] In step 1), melamine is calcined twice to obtain flake g-C 3 N 4 , and the sheet g-C 3 N 4 The dosage is 240mg;

[0060] Step 4) React 24h in the hydrothermal reactor; Get the TiO of 200mg gained Bronze phase 2 / g -C 3 N 4 The composite powder was calcined in a muffle furnace at 450 °C for 4 h to obtain anatase phase two-dimensional TiO 2 / g -C 3 N 4 composite material.

Embodiment 3

[0062] A two-dimensional anatase TiO 2 / g -C 3 N 4 The preparation of composite material, method is with embodiment 1, difference is:

[0063] In step 1), melamine is calcined twice to obtain flake g-C 3 N 4 , and the sheet g-C 3 N 4 The dosage is 140mg;

[0064] Step 4) react 20h in the hydrothermal reactor; The TiO of Bronze phase 2 / g -C 3 N 4 The composite powder was calcined in a muffle furnace at 420 °C for 4 h to obtain anatase phase two-dimensional TiO 2 / g -C 3 N 4 composite material.

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Abstract

The invention discloses a two-dimensional anatase TiO2 / g-C3N4 composite material. The material is a two-dimensional lamellar structure, and is obtained by compounding g-C3N4 and a TiO2 precursor through a surfactant. The composite material has a thickness of 2 to 20nm, a lateral dimension of 100nm to 2[mu]m and a specific surface area of 88 to 110m<2>*g<-1>. According to the composite material, an ethylene glycol modified Ti-O hydrate-surfactant-g-C3N4 sandwich structure is assembled under hydrophobic and hydrophilic actions, oxygen vacancies in TiO2(B) are supplied by air calcination, and the two-dimensional anatase TiO2 / g-C3N4 composite material is finally obtained to realize close and homogeneous compounding of two ultrathin nanosheets, so that a large-area heterogenous interface is formed, the electron transport rate is increased and light-generated electron home recombination is suppressed; the composite material has very high photocatalytic hydrogen production performance and photocatalytic organic matter degradation activity.

Description

technical field [0001] The invention relates to the technical fields of two-dimensional semiconductor composite materials and photocatalysis. More specifically, it relates to a two-dimensional anatase TiO 2 / g -C 3 N 4 Composite materials and their preparation methods and applications. Background technique [0002] Energy shortage and environmental problems are two major problems that plague the sustainable development of human beings. Semiconductor photocatalytically decomposes water to produce hydrogen and photocatalytically degrades organic pollutants, and converts solar energy into chemical energy. It has outstanding advantages such as low energy consumption, easy operation, and environmental friendliness. It provides an effective way to solve environmental and energy problems. TiO 2 Due to the advantages of low cost, strong oxidation ability, stable chemical properties, and no secondary pollution, it has attracted much attention. It is currently one of the most wid...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00B01J35/10C01B3/04B82Y30/00B82Y40/00C02F1/30C02F101/30C02F101/34C02F101/38
CPCB82Y30/00B82Y40/00C01B3/042C02F1/30B01J27/24C01B2203/1088C02F2101/30C02F2101/38C02F2101/34C02F2305/10B01J35/613B01J35/615B01J35/39Y02E60/36
Inventor 王超谷文丽吴敏黄勇
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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