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C3N4-BiVO4 catalyst with visible-light catalytic activity and preparation method thereof

A C3N4, composite catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of complicated composite methods, less research on composite reaction conditions, and long time consumption. Efficient photocatalytic degradation performance, easy mass synthesis, low equipment requirements

Inactive Publication Date: 2017-06-09
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing compound methods are all more loaded down with trivial details, are in g-C 3 N 4 and BiVO 4 It takes a long time to compound under the premise that they are all prepared, and uses a large amount of methanol and other solvents, which is harmful to the health of experimenters.
Moreover, methods including the hydrothermal method have been less researched on the reaction conditions of compounding. Generally, only the compounding ratio is considered, and important factors such as reaction temperature, time and pH are not systematically considered.

Method used

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  • C3N4-BiVO4 catalyst with visible-light catalytic activity and preparation method thereof
  • C3N4-BiVO4 catalyst with visible-light catalytic activity and preparation method thereof
  • C3N4-BiVO4 catalyst with visible-light catalytic activity and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] C 3 N 4 -BiVO 4 The preparation process of photocatalytic materials is as follows:

[0027] 1) get a certain amount of analytically pure dicyandiamide (C 2 h 4 N 4) into a 50mL ceramic crucible, cover it, roast at 520°C for 2h, grind, and dissolve 1g in distilled water with ultrasonic stirring to obtain C 3 N 4 suspension;

[0028] 2) Weigh Bi(NO 3 ) 3 ·5H 2 O, NH 4 VO 3 and cetyltrimethylammonium bromide (CTAB), the weighed Bi(NO 3 ) 3 ·5H 2 O and NH 4 VO 3 respectively dissolved in 10.0mL 2.0mol / L HNO 3 and 10.0mL2.0mol / L NaOH solution, magnetically stirred at room temperature for 1h to obtain BiVO 4 Dispersions;

[0029] 3) C configured in step 1 3 N 4 Add the suspension and the CTAB weighed in step 2 to the BiVO configured in step 2 4 In the dispersion liquid, ultrasonically disperse for 30 minutes to obtain the precursor liquid, in which BiVO 4 and C 3 N 4 The mass ratio is 1:5—1:20 (the specific mass ratios are 1:5, 1:6.7, 1:10, 1:20);

...

Embodiment 2

[0039] In order to test the pH value of the precursor solution to C 3 N 4 -BiVO 4 The influence of visible light activity, in addition to the pH value of the precursor solution, other reaction conditions such as hydrothermal temperature of 180 ℃, hydrothermal time of 6h, BiVO 4 with C 3 N 4 The mass ratio of 1:6.7, 80 ℃ of drying temperature etc. are all identical with embodiment 1. The results show that when the pH value of the current flood solution is 6.00, C 3 N 4 -BiVO 4 The total decolorization rate of methyl orange is the highest, the catalyst prepared under the neutral pH of the precursor solution is 7.00, the decolorization effect is second, and the decolorization effect is poor under the condition of the precursor solution pH of 8.00. When the pH of the precursor solution is 6.00, C 3 N 4 -BiVO 4 The total decolorization rate of methyl orange is 98.14%; when the pH of the precursor solution is 7.00, C 3 N 4 -BiVO 4 The total decolorization rate of methyl...

Embodiment 3

[0041] To examine the effect of hydrothermal temperature on C 3 N 4 -BiVO 4 The influence of visible light activity, in addition to the hydrothermal temperature, other reaction conditions such as the pH of the precursor solution is 6.00, the hydrothermal time is 6h, BiVO 4 with C 3 N 4 The mass ratio of 1:6.7, 80 ℃ of drying temperature etc. are all identical with embodiment 1. The results showed that the decolorization rate of methyl orange was the highest when the hydrothermal temperature was 180°C. When the hydrothermal temperature is 180°C, C 3 N 4 -BiVO 4 The total decolorization rate of methyl orange is 98.14%; when the hydrothermal temperature is 200°C, C 3 N 4 -BiVO 4 The total decolorization rate of methyl orange is 94.81%; when the hydrothermal temperature is 120°C, C 3 N 4 -BiVO 4 The total decolorization rate of methyl orange is 87.79%; when the hydrothermal temperature is 150°C, C 3 N 4 -BiVO 4 The total decolorization rate of methyl orange is 85.9...

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Abstract

The invention relates to a C3N4-BiVO4 composite catalyst. The C3N4-BiVO4 composite catalyst is obtained by adding C3N4 suspension after ultrasonic cavitation into a BiVO4 solution, performing ultrasonic stirring for 30 minutes and hydrothermally treating for 2-18 hours at a temperature of 100-180 DEG C. The C3N4-BiVO4 composite catalyst provided by the invention has the benefit that the C3N4-BiVO4 composite catalyst with high stability and high catalytic activity is synthesized by lower cost and a simple preparation method. The invention discloses the preparation method of the C3N4-BiVO4 composite catalyst.

Description

technical field [0001] The invention relates to synthetic catalysts with visible light catalytic activity, in particular to C 3 N 4 -BiVO 4 Composite catalyst. Background technique [0002] Photocatalytic technology uses light and catalysts to act together to produce photochemical reactions, which has certain advantages for the removal of organic substances that are difficult to biodegrade. Today's social and economic development is rapid, but it is followed by many problems such as excessive exploitation of natural resources and energy crisis, and the environmental burden is increasing day by day. Therefore, issues such as developing new energy sources and alleviating environmental pressure have been put on the agenda. Under this trend, semiconductor photocatalytic oxidation technology has many advantages and broad application prospects, and has gradually become one of the hot spots in the field of environmental governance research. [0003] C 3 N 4 and BiVO 4 Both ...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30
CPCC02F1/30B01J27/24B01J35/39
Inventor 雷明雨陈建林方琴黄珍
Owner NANJING UNIV
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