A method for removing organic pollutants in water by carboxymethyl β-cyclodextrin modified titanium nanotubes
A technology of organic pollutants and titanium nanotubes, applied in water pollutants, organic compounds/hydrides/coordination complex catalysts, water/sewage treatment, etc. The problem of high hole recombination rate, to achieve the effect of promoting mass transfer and improving photocatalytic effect
Active Publication Date: 2021-06-25
EAST CHINA UNIV OF SCI & TECH
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TiO 2 As a traditional semiconductor material, it has good chemical and thermal stability and excellent light absorption performance, but TiO 2 High electron-hole recombination rate, industrial nanoscale TiO 2 The defects such as too small particle size and difficult separation make TiO 2 applications are restricted
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[0032] The present invention will be described in more detail through specific examples below, but the protection scope of the present invention is not limited to these examples.
[0033] material preparation
[0034] (1) Carboxymethyl β-cyclodextrin
[0035] Taking carboxymethyl β-cyclodextrin as an example, the preparation scheme is introduced.
[0036] Use an electronic balance to weigh 6.000g of analytically pure β-cyclodextrin solid and add it to a 250mL clean beaker filled with 100mL of ultrapure water, use an ultrasonic cleaner to ultrasonically disperse and dissolve; add 20mL of pre-prepared sodium hydroxide with a concentration of 7mol / L Buffer solution; Weigh 4.890g of analytically pure chloroacetic acid solid, add it to the above mixed solution, and use concentrated hydrochloric acid to adjust pH=4; transfer the above mixed solution to a single-necked round bottom flask, and use a collector type constant temperature heating magnetic stirrer Reflux in an oil bath a...
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Abstract
The invention provides a method for removing organic pollutants in water by modifying titanium nanotubes with carboxymethyl β-cyclodextrin. Commercial titanium dioxide (titanium dioxide P25) is used as a precursor to prepare a nanotube with a large specificity by hydrothermal self-assembly method. Nanotubular materials with surface area—titanium dioxide nanotubes (TNT), the chemical bond formed by cyclodextrin and titanium dioxide can promote electron transfer and mass transfer at the photocatalyst-solution interface; due to the unique hydrophobic cavity of cyclodextrin, it can specifically Adsorbs organic pollutants, provides an organized microenvironment for photocatalytic oxidation, and acts as a pollutant "cage" to increase the local concentration of organic matter at the photocatalytic reaction interface; in addition, its hydrophobic cavity can contain nano-microbubbles, the oxygen Bubbles react with photogenerated electrons to generate highly oxidative superoxide radicals (·O 2 ‑ ), of; therefore, the surface modification of cyclodextrin can effectively improve the photocatalytic effect of TNT.
Description
technical field [0001] The invention relates to a method for removing organic pollutants in water by modifying titanium nanotubes with carboxymethyl beta-cyclodextrin. Background technique [0002] In recent years, reactive oxygen species (ROS)-based heterogeneous photocatalysis has been shown to be a promising method for the removal of various organic pollutants in water. Active oxygen species mainly include hydroxyl radicals ( OH ), superoxide radicals ( O 2 - ) and other free radicals, they are mainly produced by the reaction of photogenerated electrons and holes with water or oxygen. Therefore, in order to obtain higher photooxidation efficiency, it is not only necessary to have a high concentration of photogenerated electron-holes at the catalytic interface of the photocatalyst, but also to provide water and oxygen that can generate free radicals at the reaction interface. TiO 2 As a traditional semiconductor material, it has good chemical and thermal stability and ...
Claims
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IPC IPC(8): C02F1/32C02F1/72B01J31/06B01J21/06C02F101/34C02F101/36C02F101/38
CPCC02F1/32C02F1/725B01J31/069B01J21/063C02F2305/10C02F2101/38C02F2101/40C02F2101/345C02F2101/36C02F2101/34B01J35/39
Inventor 周彦波周易何洁陆建王健宇段成玉李霞刘琪凯
Owner EAST CHINA UNIV OF SCI & TECH