Method for preparing carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts and application thereof

A technology of carbon quantum dots and composite light, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and water treatment of special compounds. It can solve the problems of no literature reports, etc., to promote transmission, shorten the preparation cycle, and improve visible light response. Effect

Active Publication Date: 2017-01-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, CQDs / CaIn 2 S 4 Preparation of composite photocatalyst and use it to degrade tetracycline hydrochloride under visible light, there is no literature report at home and abroad

Method used

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  • Method for preparing carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts and application thereof
  • Method for preparing carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts and application thereof
  • Method for preparing carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts and application thereof

Examples

Experimental program
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Effect test

example 1

[0025] (1) Measure 10 mL of absolute ethanol and 10 mL of secondary deionized water into a beaker, where the volume ratio of absolute ethanol to secondary deionized water is 1:1. Weigh out 0.011 g calcium chloride, 0.044 g indium chloride, and 0.030 g thiourea, and stir to dissolve to obtain a mixed solution.

[0026] (2) Measure 1 mL of an aqueous solution of carbon quantum dots (CQDs) with a concentration of 0.003 g / mL to the solution prepared in step (1), where the diameter of the CQDs is in the range of 3 to 6 nm; after ultrasound for 5 minutes, stir for 10 minutes and transfer to The reaction kettle was treated at 120℃ for 24h, cooled naturally to room temperature, centrifuged, washed with absolute ethanol and water several times, and vacuum dried at 50℃ for 6h to obtain a carbon quantum dot / flower-like indium calcium sulfide composite photocatalyst, carbon The proportion of quantum dots in the composite is 7.0%.

[0027] Visible light for 2h, the photocatalytic degradation e...

example 2

[0030] (1) Measure 20 mL of absolute ethanol and 60 mL of secondary deionized water into a beaker, where the volume ratio of absolute ethanol to secondary deionized water is 0.33:1. Weigh out 0.033 g calcium chloride, 0.132 g indium chloride, and 0.090 g thiourea, and stir to dissolve to obtain a mixed solution.

[0031] (2) Measure 2 mL of an aqueous solution of carbon quantum dots (CQDs) with a concentration of 0.002 g / mL to the solution prepared by step (1), where the diameter of CQDs is in the range of 3 to 6 nm; after sonicating for 10 minutes, stirring for 15 minutes, transfer to The reaction kettle was treated at 140℃ for 20h, cooled naturally to room temperature, centrifuged, washed with absolute ethanol and water several times, and vacuum dried at 40℃ for 8h to obtain a carbon quantum dot / flower-like indium calcium sulfide composite photocatalyst. The proportion of quantum dots in the composite is 3.2%.

[0032] Visible light for 2h, the photocatalytic degradation efficie...

example 3

[0035] (1) Measure 40 mL of absolute ethanol and 20 mL of secondary deionized water in a beaker, respectively, where the volume ratio of absolute ethanol to secondary deionized water is 1:0.5. Weigh out 0.055 g of calcium chloride, 0.22 g of indium chloride, and 0.150 g of thiourea, and stir to dissolve to obtain a mixed solution.

[0036] (2) Measure 2 mL of an aqueous solution of carbon quantum dots (CQDs) with a concentration of 0.005 g / mL to the solution prepared by step (1), where the diameter of CQDs is in the range of 3 to 6 nm; after 15 minutes of ultrasound, after stirring for 20 minutes, transfer to The reaction kettle was treated at 160℃ for 16h, cooled naturally to room temperature, centrifuged, washed with absolute ethanol and water several times, and vacuum dried at 60℃ for 5h to obtain a carbon quantum dot / flower-like indium calcium sulfide composite photocatalyst, carbon The proportion of quantum dots in the composite is 4.8%.

[0037] Visible light for 2h, the pho...

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Abstract

The invention discloses a method for preparing novel carbon quantum dot/flower-shaped indium and calcium sulfide (CQDs/CaIn2S4) composite photocatalysts, and belongs to the field of environmental protection. The method includes preparing the CQDs/CaIn2S4 composite photocatalysts by the aid of in-situ hydrothermal processes at certain temperatures. The CQDs/CaIn2S4 composite photocatalysts prepared by the aid of the method can be applied to catalytically degrading tetracycline hydrochloride solution under the sunlight or visible light. The method has the advantages that the method includes simple technologies, is free of pollutant discharge in preparation procedures and is short in preparation period and low in energy consumption and cost, is a green synthesis technique, and the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be prepared on a large scale; the visible light response and the adsorption capacity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be improved after CQDs (carbon quantum dots) are compounded, the service lives of electrons-holes can be prolonged, photoelectron transmission can be promoted, and the visible light photocatalytic activity of the carbon quantum dot/flower-shaped indium and calcium sulfide composite photocatalysts can be greatly improved.

Description

Technical field [0001] The invention belongs to the preparation of a photocatalytic nano composite material and its application in the field of environmental protection, and particularly relates to a preparation method and application of a carbon quantum dot / indium calcium sulfide nano composite photocatalyst. Background technique [0002] With the rapid development of industrialization and the rapid improvement of people's living standards, the problem of energy depletion and environmental problems caused by a large amount of industrial wastewater and domestic wastewater have become two major problems facing mankind, seriously hindering the sustainable development of the earth. Semiconductor photocatalysis technology is considered to be the most likely to be an effective way to solve the energy crisis and deal with environmental pollution problems. The photolysis water technology that converts solar energy into clean hydrogen energy will completely solve the crisis caused by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/30
CPCY02W10/37B01J27/04B01J35/004B01J35/08C02F1/30C02F2101/30C02F2305/10
Inventor 蒋银花李凡黄刚林彭志远刘佩佩张文莉
Owner JIANGSU UNIV
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