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Adsorption-catalysis composite material and application thereof to pollutant treatment

A composite material, adsorption and catalysis technology, applied in the field of photocatalytic materials, can solve the problem of low absorption, achieve excellent adsorption performance, wide range of visible light response frequency, and good removal effect

Pending Publication Date: 2020-02-07
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its low absorption of light and the easy recombination of photogenerated electron-hole pairs, choosing a suitable semiconductor and recombining it to form a heterojunction can improve its photoelectric performance.

Method used

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  • Adsorption-catalysis composite material and application thereof to pollutant treatment
  • Adsorption-catalysis composite material and application thereof to pollutant treatment
  • Adsorption-catalysis composite material and application thereof to pollutant treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The preparation method of the copper selenide-polydopamine-graphite phase carbon nitride adsorption catalytic composite material of the present invention comprises the following specific steps:

[0026] 1) Preparation of copper selenide materials

[0027] 2.52g of sodium sulfite and 0.79g of selenium powder were added to a round-bottomed flask containing 200mL of deionized water, heated in a water bath at 70°C with constant stirring, filtered after 3 hours of reaction, and the filtrate was stored in the dark. The filtrate was sodium selenite (Na 2 SeO 3 ). Weigh 6.25g of copper sulfate pentahydrate and dissolve it in 250mL of deionized water, add 25% ammonia water to the solution dropwise, stop adding when the resulting blue precipitate disappears, and obtain tetraammine copper sulfate (Cu(NH) 3 ) 4 SO 4 ).

[0028] Measure 40mL of ethylene glycol and add it to the reaction flask, add the prepared sodium selenite (Na 2 SeO 3 ) and tetraammine copper sulfate (Cu(N...

Embodiment 2

[0037] An automatic specific surface area and pore size analyzer was used to record the adsorption-desorption isotherm of the composite material for nitrogen, and the specific surface area of ​​the adsorption catalytic composite was 186.6m obtained by the specific surface area analysis method. 2 ·g -1 , with an average pore size of 3.2 nm and a pore volume of 0.151 cm 3 ·g -1 . The adsorption catalytic material has a larger specific surface area and better adsorption performance.

[0038] figure 2 This is the nitrogen adsorption-desorption isotherm of the copper selenide-polydopamine-graphite carbon nitride adsorption catalytic composite material prepared in Example 1.

Embodiment 3

[0040] Experiment on the adsorption and catalytic degradation effect of the adsorption catalytic composite material obtained in Example 1 on methylene blue

[0041]1) Weigh 0.05g of composite adsorption catalytic material into a test tube, add 50mL to a concentration of 6.0×10 -5 mol / L methylene blue solution is put into the photochemical reactor, the stirring is turned on, the dark reaction is carried out first, and then the light source is turned on to carry out the photocatalytic reaction. Take a sample every ten minutes, measure its absorbance at the maximum absorption wavelength of methylene blue at 664 nm with a UV-Vis spectrophotometer, and calculate the concentration of methylene blue.

[0042] 2) The photodegradation rate D of methylene blue is calculated according to the following formula:

[0043]

[0044] C 0 : initial concentration; C t : Concentration at time t. The experimental results obtained are as image 3 shown.

[0045] from image 3 It can be se...

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Abstract

The invention discloses a copper selenide-polydopamine-graphite phase carbon nitride adsorption-catalysis composite material, and a preparation method and application thereof to pollutant treatment, and belongs to the technical field of photocatalytic materials. Copper selenide is a good semiconductor material, and because of a wide band gap of the copper selenide, sunlight can be better absorbed.Graphite phase carbon nitride has good thermal stability, stable chemical and optical properties, and a large specific area, and the adsorption performance of the graphite phase carbon nitride is increased. The polydopamine has a large number of hydrophilic hydroxyl and amino functional groups, surface charge of the polydopamine can be regulated by protonation and deprotonation, the hydrophilia and an abundant pi electronic system of the polydopamine easily form strong pi-pi accumulation with a benzene ring, and has high adsorption on a compound containing aromatic nucleus, and meanwhile, andthe polydopamine can accelerate separation and transfer of photo-induced electrons and protons, reduce electron-hole recombination and improve the efficiency of a catalytic reaction. Under the same conditions, the copper selenide-polydopamine-graphite phase carbon nitride adsorption-catalysis composite material exhibits higher photocatalytic adsorption property than the copper selenide and copperselenide-polydopamine nanomaterials.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a copper selenide-polydopamine-graphite phase carbon nitride adsorption and catalytic composite material, a preparation method thereof, and an application in pollutant treatment. Background technique [0002] Photocatalysis and adsorption technologies have attracted extensive attention and exploration as currently recognized fast and effective methods for treating pollutants. Photocatalytic technology can use sunlight as an energy source for material transformation, which can remove and degrade pollutants. The excellent adsorption effect of the adsorption catalyst on pollutants is also combined with the excellent degradation ability of photocatalysts on pollutants, which can achieve efficient and continuous adsorption and degradation. [0003] Copper selenide (CuSe) is a good semiconductor material, because of its wide band gap, it is conducive to be...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J20/26B01J20/30C02F1/30C02F1/28C02F101/30
CPCB01J31/069B01J20/0262B01J20/0237B01J20/262B01J20/0259C02F1/28C02F1/30C02F2305/10C02F2101/308B01J35/39
Inventor 万均白卯娟徐成成李玲玲
Owner QINGDAO UNIV OF SCI & TECH
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