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Preparation methods for CQDs/TNS composite photocatalyst and SiQDs/TNS composite photocatalyst

A technology of catalyst and composite light, which is applied in the field of photocatalysis, can solve the problems of catalyst separation and recovery and the practicality of recyclable performance constraints, and achieve the effect of stable composite photocatalyst, good degradation effect and low production cost

Inactive Publication Date: 2017-09-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In practical applications, the separation, recovery and recyclability of catalysts are bottlenecks restricting their practical application.

Method used

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  • Preparation methods for CQDs/TNS composite photocatalyst and SiQDs/TNS composite photocatalyst
  • Preparation methods for CQDs/TNS composite photocatalyst and SiQDs/TNS composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] CQDs / TNS mass ratio is 2.5%

[0021] (1) using gelatin as a carbon source, hydrothermal treatment to obtain a carbon quantum dot solution;

[0022] (2) The initially obtained CQDs solution is modified by polyethylene glycol reflux to obtain uniformly dispersed carbon quantum dots;

[0023] (3) adopt tetrabutyl titanate as titanium source, hydrothermal treatment obtains TNS;

[0024] (4) Mix CQDs and TNS in an ethanol solution with a mass ratio of 2.5%, adjust the pH to 3-4 with HCl, reflux for 5 hours, then wash and dry to obtain a CQDs / TNS composite photocatalyst.

Embodiment 2

[0026] CQDs / TNS mass 7.5%

[0027] (1) using gelatin as a carbon source, hydrothermal treatment to obtain a carbon quantum dot solution;

[0028] (2) The initially obtained CQDs solution is modified by polyethylene glycol reflux to obtain uniformly dispersed carbon quantum dots;

[0029] (3) adopt tetrabutyl titanate as titanium source, hydrothermal treatment obtains TNS;

[0030] (4) Mix CQDs and TNS in an ethanol solution with a mass ratio of 7.5%, adjust the pH to 3-4 with HCl, reflux for 5 hours, then wash and dry to obtain a CQDs / TNS composite photocatalyst. Its XRD collection of illustrative plates and and photocatalytic activity curve are shown in the appendix of specification sheet figure 1 and figure 2 .

Embodiment 3

[0032] CQDs / TNS mass ratio is 12.5%

[0033] (1) using gelatin as a carbon source, hydrothermal treatment to obtain a carbon quantum dot solution;

[0034] (2) The initially obtained CQDs solution is modified by polyethylene glycol reflux to obtain uniformly dispersed carbon quantum dots;

[0035] (3) adopt tetrabutyl titanate as titanium source, hydrothermal treatment obtains TNS;

[0036] (4) Mix CQDs and TNS in an ethanol solution with a mass ratio of 12.5%, adjust the pH to 3-4 with HCl, reflux for 5 hours, then wash and dry to obtain a CQDs / TNS composite photocatalyst.

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Abstract

The invention relates to preparation methods for a CQDs / TNS(carbon quantum dots / titanium dioxide nano-sheet) composite photocatalyst with visible light activity and a SiQDs / TNS(silicon quantum dots / titanium dioxide nano-sheet) composite photocatalyst with visible light activity. The methods comprise the following steps: (1) gelatin is used as a carbon source, and a hydrothermal method is adopted, so that a solution containing the carbon quantum dots (CQDs) is obtained, and 3-amino-propyl-trimethoxysilane is used as a silicon source, and a hydrothermal method is adopted, so that a solution containing the silicon quantum dots (SiQDs) is obtained; (2) the initially obtained solution containing the CQDs is subjected to polyethylene glycol refluxing and modification, so that the uniformly dispersed carbon quantum dots are obtained; (3) tetrabutyl titanate is adopted as a titanium source, and hydrothermal treatment in a HF aqueous solution is allowed to conduct, so that the titanium dioxide nano-sheets (TNS) are obtained; and (4) the CQDs and the SiQDs are separately mixed with the TNS according to different mass rates in an ethanol solution, the pH value is adjusted to 3-4 by HCl, refluxing treatment is allowed to conduct for 5h, and then washing and drying are allowed to conduct, so that the CQDs / TNS composite photo catalyst and the SiQDs / TNS composite photo catalyst are separately obtained. The obtained composite visible light catalysts have strong visible light catalytic degradation activity on rhodamine B, and can be recycled for a plurality of times. The preparation technologies of the catalysts are simple and easy to adjust and control, raw materials are easy to get, and the production cost is low.

Description

technical field [0001] The invention relates to a group IV quantum dot (C, Si) and TiO with visible light activity 2 Preparation method of nanosheet (TNS) composite photocatalyst. It belongs to the technical field of photocatalysis. Background technique [0002] Compared with traditional II-IV and III-V quantum dots, Group IV carbon quantum dots (CQDs), silicon quantum dots (SiQDs), etc., have good photostability, low toxicity, and unique up-conversion fluorescence properties and photoinduced electron transfer properties, and the preparation of carbon and silicon quantum dots has a wide range of raw materials and various preparation methods, and has received extensive attention in the fields of biomarkers and photocatalysis. [0003] In terms of photocatalysis, composite photocatalysts of quantum dots and many other materials have been extensively studied. Due to the up-conversion performance of CQDs and strong absorption in the visible light range, the CQDs / TNS composite...

Claims

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Application Information

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IPC IPC(8): B01J27/22B01J21/06C02F1/30C02F1/72C02F1/74C02F101/34C02F101/38
CPCC02F1/30C02F1/725C02F1/74B01J21/063B01J27/22C02F2101/38C02F2101/34C02F2305/10B01J35/39
Inventor 刘建军段冬兰左胜利
Owner BEIJING UNIV OF CHEM TECH
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