Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Visible light responsive g-C3N4/PDI photocatalyst, and preparation method and application thereof

A photocatalyst, g-c3n4 technology, applied in the field of photocatalytic materials, can solve the problems of low catalytic efficiency and lack of effective treatment technology, and achieve the effect of simple preparation method, low price and low price

Inactive Publication Date: 2018-09-25
HUAZHONG UNIV OF SCI & TECH
View PDF4 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and improvement needs of the prior art, the present invention provides a visible light responsive g-C 3 N 4 / PDI photocatalyst, its preparation method and application, its purpose is to pass the g-C of low degree of polymerization 3 N 4 (melem) is compounded with PMDA to obtain a photocatalytic performance much higher than that of g-C 3 N 4 Catalyst (g-C 3 N 4 / PDI), and apply it to the conversion of As(III) and Cr(VI) in water, thereby solving the existing visible light catalyst g-C 3 N 4 The low catalytic efficiency of As(III) and Cr(VI) in water, and the lack of effective treatment technology for As(III) and Cr(VI) in water

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Visible light responsive g-C3N4/PDI photocatalyst, and preparation method and application thereof
  • Visible light responsive g-C3N4/PDI photocatalyst, and preparation method and application thereof
  • Visible light responsive g-C3N4/PDI photocatalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The invention provides a visible light responsive g-C 3 N 4 / PDI photocatalyst preparation method, g-C 3 N 4 / PDI is abbreviated as gCP in the accompanying drawings of the description of the invention; it includes the following steps:

[0034] (1) Preparation of precursor melem: melamine is fired at 400°C to 520°C, preferably at 400°C to 500°C, more preferably at 425°C for 2 to 5 hours, and then washed with water to remove impurities to obtain melem; melem Here it is g-C with a low degree of polymerization fired at a temperature of 400°C to 520°C 3 N 4 .

[0035] (2) Mix the melem obtained in step (1) with PMDA according to the mass ratio of 1:(1~5), under a non-oxygen atmosphere at 300°C~350°C, preferably 310°C~330°C, more preferably 325°C Composite for 200min to 300min, after washing and drying, powdered g-C can be obtained 3 N 4 / PDI photocatalyst. The non-oxygen atmosphere is nitrogen or rare gas, preferably nitrogen.

[0036] The visible light-responsive g...

Embodiment 1

[0042] (1) Preparation of precursor

[0043] Put 3g of melamine in a muffle furnace and burn it at high temperature for 4 hours to polymerize the melamine at high temperature to form melem, a semiconductor material with a wide band gap, and then wash and dry to remove impurities in the system;

[0044] (2) Preparation of g-C 3 N 4 / PDI composite material

[0045] Mix and grind the material obtained in (1) with 1.2g PMDA, put it into a tube furnace, and carry out compounding under nitrogen gas at 325°C, then wash the compounded material for 3 times, and dry it to obtain g-C 3 N 4 / PDI photocatalyst.

[0046] Carry out result analysis according to the catalyst prepared in embodiment 1:

[0047] (1) Oxidation of As(III) and reduction of Cr(VI) under visible light

[0048] g-C 3 N 4 / PDI visible light catalytic activity test: with NaAsO 2 As a source of As(III), K 2 Cr 2 o 7 As a Cr(VI) source, under the irradiation of a 300W xenon lamp (filtering light below 420nm), t...

Embodiment 2

[0068] Figure 7 It is the graph showing the quenching experiment results of As(III) oxidation and Cr(VI) reduction under visible light. Among them, benzoquinone (BQ) is a superoxide radical quencher, ethylenediaminetetraacetic acid (EDTA) is a hole quencher, tert-butanol (TBA) is a hydroxyl radical quencher, and there is no quencher (No scavenger) as a control. By quenching these active substances, it can be seen that the active substances that oxidize As(III) include superoxide radicals, holes and hydroxyl radicals. The initial concentrations of As(III) and Cr(VI) were both 100 μmol / L, the solution volume was 50 mL, the catalyst concentration was 1.0 mg / L, and the pH of the solution was adjusted to 4.0. Before the experiment, it was adsorbed in the dark for 30 minutes, and after the adsorption equilibrium was reached, it was illuminated. The concentration of As(III) was detected by liquid chromatography-fluorescence spectrometer, and the concentration of Cr(VI) was detecte...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the field of photocatalytic materials, and more particularly relates to a visible light responsive type g-C3N4 / PDI photocatalyst, a preparation method thereof and applicationthereof. By combining g-C3N4 having a low polymerization degree with PMDA, the catalyst (g-C3N4 / PDI) with far higher photocatalytic performance than g-C3N4 is obtained and is applied to conversion ofAs(III) and Cr(VI) in water. The catalyst can selectively reduce oxygen to H2O2. The catalyst itself can convert the As(III) and Cr(VI), and a product produced by the catalyst can further convert theAs(III) and Cr(VI), and therefore, technical problems of the prior art that visible light photocatalyst g-C3N4 has low catalytic efficiency for treatment of As(III) and Cr(VI) in water in a water body, and As(III) and Cr(VI) in water bodies at present lack effective treatment methods are solved.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, more specifically, relates to a visible light responsive g-C 3 N 4 / PDI photocatalyst, its preparation method and application. Background technique [0002] Heavy metal complex pollution in acid wastewater has been a difficult problem for environmental scientists and engineers for decades. If not treated properly, wastewater rich in heavy metal ions, such as lead, nickel, copper, arsenic or chromium, may flow into surface water or seep into groundwater, posing a great threat to aquatic organisms and drinking water sources. Therefore, it is very necessary to remove heavy metals before they are released into the environment. [0003] As the priority pollutants, arsenic and chromium are highly toxic and often coexist with highly acidic wastewater (such as mine acid drainage). The valence state of arsenic and chromium has a decisive influence on the toxicity of the environment. For exampl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J27/24B01J35/00C02F1/30C02F1/70C02F1/72C02F101/10C02F101/22
CPCC02F1/30C02F1/70C02F1/725B01J27/24B01J31/0247C02F2305/10C02F2101/103C02F2101/22B01J35/19B01J35/39
Inventor 张延荣王钊
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com