Hollow spherical carbon nitride photocatalyst, and preparation method and application thereof

A catalyst and spherical technology, applied in the field of photocatalysis, can solve the problems of high hole-electron pair recombination rate, low visible light absorption efficiency, hindering practical application, etc., and achieve the effect of improving catalytic ability, high application prospect, and wide use of space

Pending Publication Date: 2019-11-08
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Problems such as small specific surface area, few active sites, low visible light absorption efficiency, and high hole-electron pair recombination rate have greatly hindered its practical application.

Method used

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  • Hollow spherical carbon nitride photocatalyst, and preparation method and application thereof
  • Hollow spherical carbon nitride photocatalyst, and preparation method and application thereof
  • Hollow spherical carbon nitride photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a g-C 3 N 4 The preparation of hollow sphere (HCNS) photocatalyst comprises the following specific steps:

[0036] 1. Measure 4ml of ammonia water, add 75ml of ethanol and 10ml of ultrapure water into it, and after ultrasonic stirring, add 5ml of tetraethoxysilane (TEOS) into the solution, react for 1 hour, and keep stirring at a constant speed.

[0037] 2. A mixture of 5ml TEOS and 2ml n-octadecyltrimethoxysilane was added dropwise to the mixed solution prepared above, and stood at room temperature for 2h. The solution was centrifuged to obtain a solid, which was then calcined at a high temperature of 500°C. After cooling to room temperature, grind and sieve to obtain a silica sphere template.

[0038] 3. Add 5 g of cyanamide to 1 g of silica template, mix and stir, and calcinate the obtained mixture at 550° C. in a nitrogen atmosphere.

[0039] 4. Add 1M ammonium bifluoride to the obtained powder to remove the template and obtain hollow carbon nitride sphere powde...

Embodiment 2

[0045] a g-C 3 N 4 The preparation of hollow sphere photocatalyst comprises the following specific steps:

[0046] 1. Measure 4ml of ammonia water, add 75ml of ethanol and 10ml of ultrapure water into it, and after ultrasonic mixing, add 6ml of tetraethoxysilane (TEOS) into the solution, react for 1h, and keep stirring at a constant speed.

[0047] 2. A mixture of 6ml TEOS and 3ml n-octadecyltrimethoxysilane was added dropwise to the mixed solution prepared above, and stood at room temperature for 4h. The solution was centrifuged to obtain a solid, which was then calcined at a high temperature of 550°C. After cooling to room temperature, grind and sieve to obtain a silica sphere template.

[0048] 3. 7 g of cyanamide was added to 1 g of silica template, mixed and stirred, and the obtained mixture was calcined at 550° C. in a nitrogen atmosphere.

[0049] 4. Add 1.5M ammonium bifluoride to the obtained powder to remove the template and obtain hollow carbon nitride sphere po...

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Abstract

The invention belongs to the technical field of photocatalysts and discloses a hollow spherical carbon nitride photocatalyst, and a preparation method and application thereof. The photocatalyst is prepared by the following steps: mixing ethanol, ammonia water and ultrapure water, adding tetraethoxysilane, and carrying out stirring at a constant speed to obtain a solution A; dropwise adding a mixedsolution B of tetraethoxysilane and n-octadecyl trimethoxysilane into the solution A, carrying out standing at room temperature, and calcining a solid obtained by centrifugation at 500-550 DEG C to obtain a silicon dioxide sphere template; mixing the silica sphere template and cyanamide at a temperature of 60-80 DEG C, and calcining the obtained mixture at a temperature of 500-550 DEG C in the nitrogen atmosphere to obtain powder C; and adding an ammonium bifluoride solution into powder C to remove the template, carrying out washing with water, and carrying out drying. The synthesis process is simple, and the obtained hollow porous photocatalyst presents morphology of spheres with uniform sizes, has good physical and chemical stability and huge specific surface area, has good catalytic performance, and has basic conditions for practical application.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and more specifically relates to a hollow spherical carbon nitride photocatalyst and its preparation method and application. Background technique [0002] The pollution of aquatic environments by pharmaceuticals and personal care products (PPCPs) has received extensive attention in recent years. Due to its high chemical stability, it is difficult to remove it effectively by traditional water treatment processes. Long-term exposure to PPCPs water environment will bring harm to the ecosystem and even human health. Therefore, it is urgent to develop technologies for the efficient removal of PPCPs in water. Photocatalytic degradation technology uses sunlight as energy, has the advantages of high treatment efficiency, low cost, green and pollution-free, and provides a new way for treating wastewater and removing toxic substances in the environment. [0003] Graphitized carbon nitride (g-C 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/08B01J35/10B01J37/00C02F1/30C02F101/36C02F101/34C02F101/38
CPCB01J27/24B01J35/004B01J35/08B01J35/1014B01J35/1061B01J37/0018C02F1/30C02F2101/34C02F2101/36C02F2101/38C02F2305/10
Inventor 巫健清刘国光王枫亮吴昱亮王盈霏吕文英
Owner GUANGDONG UNIV OF TECH
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