Method for degrading polycyclic aromatic hydrocarbon wastewater based on layered titanium lanthanum niobate as catalyst

A polycyclic aromatic hydrocarbon and catalyst technology, which is applied in the fields of industrial catalysis and ecological environment protection, can solve the problems of easy agglomeration of particles and weak adsorption of organic substances, and achieves the effects of high degree of reaction, high dispersibility, and reduced use cost.

Active Publication Date: 2019-10-22
GUANGXI ACAD OF SCI
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it encounters water, it rapidly hydrolyzes, generates heat, and generates titanic acid, and then sinters at high temperature to form titanium dioxide (TiO 2 ), TiO 2 With the advantages of high photosensitivity and photostability, non-toxic and cheap, it is widely used as a photocatalytic material in the fields of wastewater treatment and gas purification, but TiO 2 The shortcomings of particles such as easy agglomeration, weak ability to adsorb organic matter, and high recombination rate of photogenerated electrons and holes limit its photocatalytic performance. 2 Photocatalyst modification helps to improve photocatalytic effect

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
  • Method for degrading polycyclic aromatic hydrocarbon wastewater based on layered titanium lanthanum niobate as catalyst
  • Method for degrading polycyclic aromatic hydrocarbon wastewater based on layered titanium lanthanum niobate as catalyst
  • Method for degrading polycyclic aromatic hydrocarbon wastewater based on layered titanium lanthanum niobate as catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for degrading polycyclic aromatic hydrocarbon wastewater based on layered lanthanum niobate-titanium catalyst, comprising the following steps:

[0026] (1) Disperse 0.005mol of lanthanum carbonate, 0.01mol of niobium hydroxide and 0.005mol of tetra-n-butyl titanate in 100mL of absolute ethanol at a stirring speed of 1200r / min, and slowly add 120mL of Deionized water, continue to stir and react for 240 minutes to fully hydrolyze the titanate, put it in an oven and dry it at 105°C for 10 hours to obtain the catalyst precursor;

[0027] (2) Press the above catalyst precursor into a cylindrical shape under the pressure of 30MPa, put it into a vacuum ceramic tube furnace, and raise the temperature to 1050°C at a rate of 5°C / min in the air atmosphere and keep it warm for 180min, then cool After grinding and crushing, the layered titanium lanthanum niobate catalyst is obtained;

[0028] (3) Add 0.01g of layered titanium lanthanum niobate to 150mL of naphthalene-conta...

Embodiment 2

[0030] A method for degrading polycyclic aromatic hydrocarbon wastewater based on layered lanthanum niobate-titanium catalyst, comprising the following steps:

[0031] (1) Disperse 0.005mol of lanthanum carbonate, 0.01mol of niobium hydroxide and 0.005mol of isopropyl titanate in 100mL of absolute ethanol at a stirring speed of 1200r / min. After heating up to 60°C, slowly drop 120mL to remove Ionized water, continue to stir and react for 240 minutes to fully hydrolyze the titanate, put it in an oven and dry it at 105°C for 10 hours to obtain the catalyst precursor;

[0032] (2) Press the above catalyst precursor into a cylindrical shape under the pressure of 30MPa, put it into a vacuum ceramic tube furnace, and raise the temperature to 1050°C at a rate of 5°C / min in the air atmosphere and keep it warm for 180min, then cool After grinding and crushing, the layered titanium lanthanum niobate catalyst is obtained;

[0033](3) Add 0.02g of layered titanium lanthanum niobate to 150...

Embodiment 3

[0035] A method for degrading polycyclic aromatic hydrocarbon wastewater based on layered lanthanum niobate-titanium catalyst, comprising the following steps:

[0036] (1) Disperse 0.005mol lanthanum hydroxide, 0.01mol niobium hydroxide and 0.005mol tetra-n-butyl titanate in 100mL absolute ethanol at a stirring speed of 1200r / min, raise the temperature to 60°C, and slowly add 120mL of deionized water, continue stirring for 240min to fully hydrolyze the titanate, put it in an oven at 105°C and dry for 10h to obtain the catalyst precursor;

[0037] (2) Press the above catalyst precursor into a cylindrical shape under the pressure of 30MPa, put it into a vacuum ceramic tube furnace, and raise the temperature to 1050°C at a rate of 5°C / min in the air atmosphere and keep it warm for 180min, then cool After grinding and crushing, the layered titanium lanthanum niobate catalyst is obtained;

[0038] (3) Add 0.05g of layered titanium lanthanum niobate to 150mL of acenaphthylenene-con...

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

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for degrading polycyclic aromatic hydrocarbon wastewater based on layered titanium lanthanum niobate as a catalyst. Precursors such as a lanthanum salt, niobium hydroxide and a titanate are uniformly dispersed, and are calcined at a high temperature to obtain the layered titanium lanthanum niobate catalyst. The degradation of polycyclic aromatic hydrocarbons such as naphthalene, acenaphthene, acenaphthylene and fluorenes in wastewater is efficiently catalyzed under the action of ultraviolet light and the catalyst. The method provided by the invention has the advantages of simple process, high catalysis efficiency and low energy consumption, and provides reliable technical support for promoting pollutant treatment and environmental restoration.

Description

technical field [0001] The invention relates to a method for catalyzing the degradation of polycyclic aromatic hydrocarbons in waste water under the action of ultraviolet light, belonging to the fields of industrial catalysis and ecological environment protection. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) refer to organic compounds containing two or more benzene ring structures. They are the most diverse among volatile organic compounds. According to the National Institute of Standards and Technology (NIST), they have listed naphthalene, anthracene , phenanthrene, pyrene and other 922 chemical structures of PAHs. PAHs are mainly derived from coal and oil combustion, waste incineration and motor vehicle exhaust emissions, etc., together with fine particles in the air to form smog, and then washed to the ground by rainwater to form PAHs wastewater, which is a ubiquitous environmental organic pollutant . PAHs have the characteristics of high toxici...

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): C02F1/32B01J23/648C02F101/30
CPCC02F1/32B01J23/6484C02F2101/30C02F2305/10B01J35/39
Inventor 黎演明吴光严少敏龙思宇师德强
Owner GUANGXI ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap