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Carbon dot-modified carbon nitride/stannic oxide composite photocatalyst, and preparation method and application thereof

A technology of tin dioxide and carbon nitride, which is applied in the field of photocatalytic materials, can solve the problems of high recombination rate, low toxicity and high stability of photogenerated carriers, and achieve the effects of improving catalytic ability, inhibiting recombination, and improving photocatalytic efficiency

Active Publication Date: 2020-05-22
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphitized carbon nitride (CN), as a new type of non-metal semiconductor material, has been widely used in the field of photocatalytic degradation of organic pollutants due to its high stability, low toxicity and visible light response. However, a single carbon nitride There are many limitations, such as high recombination rate of photogenerated carrier, low utilization rate of visible light, small specific surface, etc., which seriously restrict its photocatalytic activity.

Method used

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  • Carbon dot-modified carbon nitride/stannic oxide composite photocatalyst, and preparation method and application thereof
  • Carbon dot-modified carbon nitride/stannic oxide composite photocatalyst, and preparation method and application thereof
  • Carbon dot-modified carbon nitride/stannic oxide composite photocatalyst, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. First add 5g of guanidine hydrochloride into a covered alumina crucible, put it into a muffle furnace, heat up to 550°C for 4 hours at a rate of 2°C / min in an air environment, anneal to room temperature, and grind to obtain carbon nitride Powder: Dissolve 2.1g of tin tetrachloride pentahydrate in 70mL of ultrapure water, transfer to stainless steel lined with polytetrafluoroethylene after ultrasonic heating, heat in an oven at 180°C, wash several times with deionized water and ethanol, and collect The white product is SnO 2 .

[0037] 2. Dissolve 3g of citric acid and 1g of urea in 10mL of ultrapure water for ultrasonication, transfer to a polytetrafluoroethylene-lined stainless steel reactor, heat in an oven at 180°C, cool to room temperature, centrifuge at 10,000r / min for 30min, and collect The clear solution was dissolved in deionized water to obtain CDs stock solution.

[0038] 3. Dissolve 0.32g of carbon nitride and 0.08g of tin dioxide in ethanol solution, ul...

Embodiment 2

[0041] 1. First add 5.0g of guanidine hydrochloride into a covered alumina crucible, put it into a muffle furnace, heat up to 550°C for 4 hours at a heating rate of 2.5°C / min in an air environment, anneal to room temperature, and grind to obtain Carbon nitride powder; Dissolve 2.3g of tin tetrachloride pentahydrate in 70mL of ultrapure water, and transfer it into a polytetrafluoroethylene-lined muffle furnace after ultrasonication for 1h. After heating at 180°C, use deionized water and ethanol centrifuged several times, the collected white product is SnO 2 .

[0042] 2. Dissolve 2.5g of citric acid and 1.3g of urea in 10mL of ultrapure water for ultrasonication, transfer to a polytetrafluoroethylene inner stainless steel reaction kettle, heat in an oven at 180°C, cool to room temperature, centrifuge at 10,000r / min for 30min, and collect The supernatant was dissolved in 100 mL deionized water to obtain CDs stock solution.

[0043] 3. Dissolve 0.32g of carbon nitride and 0.08g...

Embodiment 3

[0046] 1. First add 4.5g of guanidine hydrochloride into a covered alumina crucible, put it into a muffle furnace, heat up to 550°C for 4 hours at a rate of 2°C / min in an air environment, anneal to room temperature, and grind to obtain nitriding Carbon powder: Dissolve 2.1g of tin tetrachloride pentahydrate in 70mL of ultrapure water, transfer to a Teflon-lined muffle furnace after ultrasonication for 1h, heat in an oven at 180°C, and centrifuge with deionized water and ethanol After washing several times, the white product is collected as SnO 2 .

[0047] 2. Dissolve 2.8g of citric acid and 1.2g of urea in 10mL of ultrapure water and sonicate for 1h, then transfer to a polytetrafluoroethylene-lined stainless steel reactor, heat in an oven at 180°C, cool to room temperature, and centrifuge at 10,000r / min for 30min , the collected supernatant was dissolved in 100 mL deionized water to obtain CDs stock solution.

[0048] 3. Dissolve 0.32g of carbon nitride and 0.08g of tin dio...

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Abstract

The invention belongs to the technical field of photocatalytic materials, and discloses preparation and application of a carbon dot-modified carbon nitride / tin dioxide composite photocatalyst. The photocatalyst is prepared through the following steps: calcining guanidine hydrochloride at 500-550 DEG C, and carrying out grinding to obtain carbon nitride powder; dissolving tin tetrachloride pentahydrate in ultrapure water, carrying out heating at 140-160 DEG C, and performing centrifugal cleaning to obtain tin dioxide; dissolving citric acid and urea in ultrapure water, carrying out ultrasonic treatment, conducting heating at 160-180 DEG C, performing centrifuging, collecting a supernatant, and dissolving the supernatant in deionized water to obtain a CDs stock solution; dissolving carbon nitride powder and stannic oxide in ethanol, carrying out heating in a water bath at 60-70 DEG C, calcining the obtained solid at 350-400 DEG C, dissolving the obtained CN / SnO2 and CDs stock solution inethanol, carrying out ultrasonic treatment, performing heating in a water bath at 60-70 DEG C, and calcining the obtained solid at 280-300 DEG C to obtain the photocatalyst. The photocatalyst provided by the invention effectively improves the light absorption performance of a CN / SnO2 photocatalytic material.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a carbon dot modified carbon nitride / tin dioxide composite photocatalyst and its preparation method and application. Background technique [0002] As a non-steroidal anti-inflammatory drug, indomethacin was widely used in anti-inflammatory drugs in the 1970s because it can inhibit the synthesis of cyclooxygenase necessary for prostaglandins and other steroids to exert Anti-inflammatory and analgesic effects, and its chemical properties are stable. Although the concentration of indomethacin anti-inflammatory drug in the natural environment is very low, the traditional sewage treatment process lacks effective degradation of it, making its content in natural water bodies show a cumulative increase, which has great potential for the water body environment and human health threaten. Therefore, the development of efficient water treatment technology for t...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCB01J27/24C02F1/30C02F2305/10C02F2101/38B01J35/39Y02W10/37
Inventor 刘国光钟嘉鹏李达光黄加兴吕文英
Owner GUANGDONG UNIV OF TECH
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