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

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Problems solved by technology

[0004] In practical applications, the separation, recovery and recyclabil

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

Example Embodiment

[0019] Example 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.

Example Embodiment

[0025] Example 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 .

Example Embodiment

[0031] Example 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 a preparation method of CQDs/TNS and SiQDs/TNS composite photocatalyst with visible light activity. The steps of the present invention are (1) using gelatin as a carbon source, 3-amino, propyl-trimethoxysilane as a silicon source, and hydrothermal treatment to obtain carbon quantum dots (CQDs) and silicon quantum dots (SiQDs) solutions respectively; ( 2) The initially obtained CQDs solution was modified by polyethylene glycol reflux to obtain uniformly dispersed carbon quantum dots; (3) Tetrabutyl titanate was used as the titanium source, and TNS was obtained by hydrothermal treatment in HF aqueous solution; (4) CQDs and SiQDs were mixed with TNS in different mass ratios in ethanol solution, adjusted to pH 3-4 with HCl, refluxed for 5 h, then washed and dried to obtain CQDs/TNS and SiQDs/TNS composite photocatalysts. The composite visible light catalyst obtained by the invention has strong visible light catalytic degradation activity for rhodamine B, and can be recycled for many times. The preparation process of the catalyst is simple and easy to control, the raw materials are easy to obtain, 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
CPCB01J27/22B01J21/063B01J35/004C02F1/30C02F1/725C02F1/74C02F2101/34C02F2101/38C02F2305/10
Inventor 刘建军段冬兰左胜利
Owner BEIJING UNIV OF CHEM TECH
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