Preparation method of TiO2/g-C3N4 composite visible-light photocatalyst

A visible light and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of operator safety and hidden danger operation requirements, and achieve high photocatalytic degradation rate , simple process, and more photocatalytic active centers

Active Publication Date: 2017-06-13
JIANGSU UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

The ammonium fluoride used in the preparation process of the preparation method is a highly toxic substance, which poses a safety hazard to operators and requires high operating requirements

Method used

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  • Preparation method of TiO2/g-C3N4 composite visible-light photocatalyst
  • Preparation method of TiO2/g-C3N4 composite visible-light photocatalyst
  • Preparation method of TiO2/g-C3N4 composite visible-light photocatalyst

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Embodiment 1）

[0035] This embodiment prepares TiO 2 / g -C 3 N 4 The method for composite visible light catalyst comprises the following steps:

[0036] ① Precursor preparation. 20mL Ti(OBu) 4 and 20g of melamine in 500mL of ethanol at 20°C were uniformly dispersed, and then added to the Ti(OBu) containing Ti(OBu) 4 Add 50 mL of water dropwise to ethanol containing melamine to obtain a mixed material; evaporate the mixed material to dryness in a water bath at 70° C. to 85° C. (80° C. in this embodiment) under stirring to obtain a precursor.

[0037] ② Transfer the precursor prepared in step ① to a muffle furnace, and calcinate it at 520 °C for 2 hours in the muffle furnace to obtain TiO 2 / g -C 3 N 4 Composite visible light catalyst.

[0038] Characterize the product obtained in this embodiment: the transmission electron microscope (TEM) used for the characterization is the transmission electron microscope of the JEOL 2010 model of JEOL Corporation; the X-ray diffractometer is the X-...

Embodiment 2）

[0044] This embodiment prepares TiO 2 / g -C 3 N 4 The method all the other of composite visible photocatalyst is identical with embodiment 1, and difference is: step 1. in Ti(OBu) 4 The addition amount of the solution is 5mL, the temperature of ethanol is 25°C, and the temperature of the water bath is 85°C.

[0045] Detected by X-ray diffractometer, the product of the present embodiment is g-C 3 N 4 , Anatase TiO 2 and rutile TiO 2 The mixture of crystals shows that this embodiment has successfully produced TiO 2 / g -C 3 N 4 Composite visible light catalyst.

[0046] TiO prepared in this embodiment 2 / g -C 3 N 4 The TEM spectrum of the composite visible photocatalyst reveals nano-TiO 2 The particles are evenly distributed in the graphite flake g-C 3 N 4 middle.

[0047] Detected by the ultraviolet-visible spectrometer, the TiO synthesized in this embodiment 2 / g -C 3 N 4 The visible light absorption region of the composite visible light catalyst is from 390 ...

Embodiment 3）

[0050] This embodiment prepares TiO 2 / g -C 3 N 4 The method all the other of composite visible photocatalyst is identical with embodiment 1, and difference is: step 1. in Ti(OBu) 4 The addition amount of water is 100mL, the dropwise addition amount of water is 1000mL, and the temperature of the water bath is 85°C.

[0051] Detected by X-ray diffractometer, the product of the present embodiment is g-C 3 N 4 , Anatase TiO 2 and rutile TiO 2 The mixture of crystals shows that this embodiment has successfully produced TiO 2 / g -C 3 N 4 Composite visible light catalyst.

[0052] TiO prepared in this embodiment 2 / g -C 3 N 4 The TEM spectrum of the composite visible photocatalyst reveals nano-TiO 2 The particles are evenly distributed in the graphite flake g-C 3 N 4 middle.

[0053] Detected by the ultraviolet-visible spectrometer, the TiO synthesized in this embodiment 2 / g -C 3 N 4 The visible light absorption region of the composite visible light catalyst is f...

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Abstract

The invention discloses a preparation method of a TiO2 / g-C3N4 composite visible-light photocatalyst. The preparation method comprises the following steps: a Ti source and an N source are uniformly dispersed in ethyl alcohol, then water is added dropwise to the ethyl alcohol, and a mixed material is obtained; a precursor is obtained by evaporating the mixed material in a stirring state to dryness; the prepared precursor is transferred into a muffle furnace and calcined in the muffle furnace at 300-800 DEG C for 0.5-12 h, and the TiO2 / g-C3N4 composite visible-light photocatalyst is obtained. The TiO2 / g-C3N4 composite visible-light photocatalyst is prepared during preparation of TiO2 and g-C3N4, and synthesis of TiO2 and g-C3N4 and preparation of the composite catalyst are realized in one step; the process is simple, and industrial production is easy to realize. The composite visible-light photocatalyst has many photocatalytic activity centers and is higher in light absorptivity, photocatalytic activity and rate of photocatalytic degradation of organic matter.

Description

[0001] This application is the application number 201410621237.1, the application date is November 6, 2014, and the name of the invention is "TiO 2 / g -C 3 N 4 A divisional application of the invention patent application of "Preparation Method of Composite Visible Light Catalyst". technical field [0002] The invention relates to a preparation method of a visible light catalyst, in particular to a TiO 2 / g -C 3 N 4 Preparation method of composite visible light catalyst. Background technique [0003] Semiconductor photocatalysts have attracted much attention in the past few decades. Because it is widely used in direct hydrolysis to obtain renewable energy hydrogen and environmental protection of organic polluted wastewater. [0004] Among many semiconductors, TiO 2 Due to its non-toxicity, low cost, high stability and excellent photocatalytic ability, it has become the most researched and most promising semiconductor material. However, due to its large energy gap (suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/02C02F1/30C02F101/30
CPCC02F1/30B01J27/24C02F2305/10C02F2101/308C02F2101/30C02F2101/40C02F2101/38B01J35/00B01J35/30B01J35/39Y02W10/37
Inventor 张春勇郑纯智文颖频张国华舒莉程洁红马迪
Owner JIANGSU UNIV OF TECH
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