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High-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and preparation method thereof

A high-stability nanobelt technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low catalytic activity improvement ratio and ternary composite material stability to be improved

Active Publication Date: 2019-08-23
YUNNAN MINZU UNIV
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  • Abstract
  • Description
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Problems solved by technology

Although these three components have been combined into composite materials, on the one hand, the prepared ternary composites are relative to the g-C 3 N 4 -TiO 2 or TiO 2 -The increase in the catalytic activity of GR is not high, the main reason is that the ternary material belongs to the disordered assembly hybrid material
On the other hand, the stability of the prepared ternary composites needs to be improved

Method used

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  • High-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and preparation method thereof
  • High-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and preparation method thereof
  • High-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) In the first step, first weigh 5 g of P25 and suspend it in 25 mL of 10 M NaOH aqueous solution, stir for 1 h, transfer to a hydrothermal reaction kettle, stir at 400 rpm, 180 o C reacted in an oil bath for 72 h, cooled, washed with water to pH = 7, then washed with 1 M HCl solution for 1 h, filtered and washed 3 times with water, and dried at 50 for 24 h to obtain TiO 2 nanobelt;

[0029] (2) In the second step, accurately pipette 1mL of a 2mg / mL graphene oxide solution (the volume ratio of water and ethanol is 2:1 as a mixed solvent), and then add 29mL of a mixed solvent of water and ethanol (V water: V ethanol = 2:1), sonicated for 0.5 h, and 0.2 g TiO was added under vigorous stirring 2 Nanobelts were ultrasonically dispersed for 10 min, stirred at room temperature for 2 h, and then the suspension was transferred to a polytetrafluoroethylene high-temperature and high-pressure reactor at 220 o C for 7 h, naturally cooled to room temperature, centrifuged, washed...

Embodiment 2

[0034] (1) In the first step, first weigh 5 g of P25 and suspend it in 25 mL of 10 M NaOH aqueous solution, stir for 1 h, transfer to a hydrothermal reaction kettle, stir at 400 rpm, 180 o C reacted in an oil bath for 72 h, cooled, washed with water to pH = 7, then washed with 1 M HCl solution for 1 h, filtered and washed 3 times with water, and dried at 50 for 24 h to obtain TiO 2 nanobelt;

[0035] (2) In the second step, accurately pipette 1mL of a 2mg / mL graphene oxide solution (the volume ratio of water and ethanol is 2:1 as a mixed solvent), and then add 29mL of a mixed solvent of water and ethanol (V water: V ethanol = 2:1), sonicated for 0.5 h, and 0.2 g TiO was added under vigorous stirring 2 Nanobelts were ultrasonically dispersed for 10 min, stirred at room temperature for 2 h, and then the suspension was transferred to a polytetrafluoroethylene high-temperature and high-pressure reactor at 220 o C for 7 h, naturally cooled to room temperature, centrifuged, washed...

Embodiment 3

[0040] (1) In the first step, first weigh 5 g of P25 and suspend it in 25 mL of 10 M NaOH aqueous solution, stir for 1 h, transfer to a hydrothermal reaction kettle, stir at 400 rpm, 180 o C reacted in an oil bath for 72 h, cooled, washed with water to pH = 7, then washed with 1 M HCl solution for 1 h, filtered and washed 3 times with water, and dried at 50 for 24 h to obtain TiO 2 nanobelt;

[0041] (2) In the second step, accurately pipette 5mL of 2mg / mL graphene oxide (the volume ratio of water and ethanol is 2:1 as a mixed solvent) solution, and then add 25mL of a mixed solvent of water and ethanol (V water: V ethanol = 2:1), sonicated for 0.5 h, and 0.5 g TiO was added under vigorous stirring 2 Nanobelts were ultrasonically dispersed for 10 min, stirred at room temperature for 2 h, and then the suspension was transferred to a polytetrafluoroethylene high-temperature and high-pressure reactor at 220 o C for 7 h, naturally cooled to room temperature, centrifuged, washed 3...

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Abstract

The invention provides a high-stability TiO2 nanobelt-RGO-porous carbonitride composite photocatalyst, and a preparation method thereof. The preparation method comprises following steps: firstly, 0.2to 10g of P25 is weighed, and is added into 10 to 50ml of a 10M NaOH solution, stirring is carried out for 0.5 to 1h, at 200 to 600rpm stirring conditions, hydro-thermal reaction is carried out for 24to 72h at 120 to 180 DEG C, cooling is carried out, washing with 1 to 3M HCl is carried out for 0.5 to 1h, washing with water is carried out for 3 to 5 times until pH value is 7, drying is carried out for 12 to 24h at 50 to 80 DEG C so obtain TiO2 nanobelt; then 1 to 10ml of 2mg / ml oxidized graphene solution is added into 20 to 29ml of a mixed solvent of water and ethanol (V water : V ethanol=2:1), ultrasonic treatment is carried out for 0.5 to 1h, stirring is carried out and 0.1 to 0.5g of the TiO2 nanobelt is added, ultrasonic treatment is carried out for 5 to 20min, stirring is carried outfor 1 to 3h, hydro-thermal reaction is carried out for 5 to 10h at 150 to 250 DEG C, cooling and centrifugation are carried out, water washing is carried out for 3 to 5 times, drying is carried out for 12 to 24h at 50 to 80 DEG C to obtain TiO2 nanobelt-RGO; 5 to 10g of urea is subjected to roasting for 1 to 4h at 400 to 600 DEG C with 0.5 to 1.2ml / min nitrogen gas introduction, grinding is carried out to obtain Pg-C3N4; and at last, 0.02 to 0.5g of TiO2 nanobelt-RGO and 0.1 to 0.3g Pg-C3N4 are weighed and grinded to be uniform, and roasting is carried out for 1 to 4h at 400 to 600 DEG C with0.5 to 1.2ml / min nitrogen gas introduction to prepare the TiO2 nanobelt-RGO-Pg-C3N4.

Description

technical field [0001] The invention belongs to the field of semiconductor photocatalysts, in particular to a highly stable TiO 2 Preparation method of nanobelt-RGO-porous carbon nitride composite photocatalyst. Background technique [0002] Photocatalytic technology is one of the most promising "environmentally friendly" water treatment technologies, which can degrade organic pollutants into non-toxic carbon dioxide and water under the action of sunlight [1] . Although conventionally used TiO 2 Photocatalyst has the characteristics of stable physical and chemical properties, low cost, non-toxicity and high catalytic activity, but it can only absorb ultraviolet light, and photogenerated electrons-holes are easy to recombine, and the quantum efficiency is low. limitations. Therefore, the research and development of stable, low-cost, and highly active photocatalysts that respond to visible light is the focus and hotspot in the field of photocatalysis. In the present inven...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J37/10B01J37/34B01J37/08C02F1/30C02F101/34
CPCB01J27/24B01J37/10B01J37/343B01J37/082C02F1/30C02F2101/34C02F2305/10C02F2101/305B01J35/613B01J35/39
Inventor 罗利军石苗夏丽红李俊红王红斌龙俊宏
Owner YUNNAN MINZU UNIV
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