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Iron-based quantum dot modified g-C3N4 visible light drive Fenton-like catalyst

A C3N4, g-c3n4 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low efficiency of oxidative degradation of organic matter, secondary pollution recovery cost, small particle size, etc. To solve the problem of iron-containing sludge, reduce the loss of iron species, and achieve the effect of small particle size

Inactive Publication Date: 2018-11-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the defects of low efficiency of oxidative degradation of organic matter in heterogeneous Fenton catalysts, secondary pollution caused by loss of iron ions and high recovery cost, and to provide an iron-based quantum dot modified g-C 3 N 4 Visible light-driven Fenton-like catalyst and its preparation method and application; the supported iron phase is amorphous, the particle size is small, and the required loading amount is small, realizing the full use of clean and pollution-free sunlight to promote Fenton advanced oxidation technology Treating Refractory Pollutants and Providing a New Fenton Catalyst for the Advanced Oxidation Field

Method used

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  • Iron-based quantum dot modified g-C3N4 visible light drive Fenton-like catalyst
  • Iron-based quantum dot modified g-C3N4 visible light drive Fenton-like catalyst
  • Iron-based quantum dot modified g-C3N4 visible light drive Fenton-like catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Prepare 5g / L ferric chloride hexahydrate-ethanol solution, draw 9.16ml of the solution into the volumetric flask, add the ethanol solution to make the volume to 50ml, stir magnetically to dissolve it completely; add the prepared g-C 3 N 4 3 g of solid was dispersed by ultrasonic for 10 min, 0.02 mg of ammonium bicarbonate powder was added, and magnetically stirred for 8 h in a fume hood. The solid sample was separated and collected, washed and filtered three times, and then vacuum-dried at 40°C to obtain a loaded 0.4% FeOOH / g-C 3 N 4 catalyst( figure 2 ),Depend on figure 2 It can be seen from the scanning electron microscope image that g-C 3 N 4 It is stacked in layers with a large surface area, and dispersed iron-based quantum dots appear on the layered support.

[0040] Change the amount of ferric chloride hexahydrate-ethanol solution and ammonium bicarbonate powder to 18.42ml, 0.02mg and 46.75ml, 0.20mg, respectively to obtain 0.9% FeOOH / g-C 3 N 4 Catalyst ...

Embodiment 2

[0044] In 50ml of methyl orange solution (25mg / L), add 50mg of 0.4% FeOOH / g-C 3 N 4 , 0.9% FeOOH / g-C 3 N 4 , 2.3% FeOOH / g-C 3 N 4 Catalyst samples, magnetically stirred for 30min to make the system adsorption equilibrium, then add 30μL of H 2 o 2 Solution (30wt%) is irradiated with a xenon lamp light source and starts to react. During the reaction, the temperature is kept at about 30° C., and the complete degradation time of methyl orange is respectively 90min, 60min, 90min ( image 3 ).

Embodiment 3

[0046] In 20ml phenol solution (50mg / L), add 0.4% FeOOH / g-C respectively 3 N 4 , 0.9% FeOOH / g-C 3 N 4 , 2.3% FeOOH / g-C 3 N 4 Catalyst 80mg, after magnetic stirring for 30min, add 30μL of H 2 o 2 (30wt%), irradiate with a xenon lamp light source and start to react, keep the reaction temperature between 30~33°C during the experiment, the gas phase sampling needle collects 500 μ L gas samples each time and injects them into the gas chromatograph (GC-7900) to detect the carbon dioxide concentration . Within 120min, the mineralization rates of phenol were 61%, 74%, 24% ( Figure 4 ).

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Abstract

The invention provides an iron-based quantum dot modified g-C3N4 visible light drive Fenton-like catalyst. The visible light drive Fenton-like catalyst is prepared by adopting g-C3N4 as a carrier andloading an iron-based quantum dot on the surface. A preparation method of the visible light drive Fenton-like catalyst is simple, and no toxic and harmful substances are produced during the middle process. The catalyst prepared through the invention can be used for quickly degrading methyl orange, phenol and persistent organic pollutants under the irradiation of hydrogen peroxide and visible light, and has favorable catalytic activity and stability. After the catalyst is reacted, the iron ion loss amount is small (when pH is 5, the loss amount is 0.005ppm which is far below a standard limitedvalue), so that the catalyst can solve the problems that according to a traditional heterogeneous Fenton catalyst, the iron sludge is produced due to the iron ion loss, and the catalytic efficiency ofthe pure g-C3N4 Fenton-like catalyst needs to be improved.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a g-C modified with iron-based quantum dots 3 N 4 Visible light-driven Fenton-like catalyst and its preparation method and application. Background technique [0002] In recent years, with the rapid development of textile printing and dyeing, petrochemical and other industries, the problem of water environmental pollution caused by the discharge of printing and dyeing wastewater and phenol-containing wastewater has become more and more serious. The light, heat and chemical properties of phenols and dye molecules are stable and anti-microbial attack, which is difficult to eliminate by conventional biological treatment processes. Advanced Oxidation Technology (AOPs) can use light, sound, electricity, magnetic and other physical and chemical processes to generate highly active intermediate hydroxyl radicals ( OH), which can quickly mineralize refractory organic pollutants. Fenton oxidation...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/72C02F101/34C02F101/30
CPCC02F1/722C02F1/725B01J27/24C02F2101/345C02F2101/308C02F2305/10C02F2305/026B01J35/39
Inventor 钱旭芳赵一新吴韵雯方梦媛岳东亭阚淼
Owner SHANGHAI JIAO TONG UNIV
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