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An amphiphilic nanotio 2 Powder catalyst and its preparation method and use method

An amphiphilic and catalyst technology, applied in physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve problems that do not involve photocatalytic reactions and applications, time-consuming, Difficulty in operation and other problems, to achieve the effect of practical operation, avoid falling off and self-degradation, and large contact area

Active Publication Date: 2017-10-31
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Chinese patent CN104016361 A uses a silane coupling agent to first modify the epoxy group on the surface of the nanoparticle, then use hexamethylenediamine and epoxy to further introduce the amino group, and finally add an appropriate amount of hydrochloric acid to neutralize it to form a new type of amphiphilic nanoparticle particles, this method can prepare a stable Pickering emulsion, but this patent involves multiple steps, takes a long time, is difficult to operate, and does not involve photocatalytic reactions and applications

Method used

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  • An amphiphilic nanotio <sub>2</sub> Powder catalyst and its preparation method and use method
  • An amphiphilic nanotio <sub>2</sub> Powder catalyst and its preparation method and use method
  • An amphiphilic nanotio <sub>2</sub> Powder catalyst and its preparation method and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Using unmodified nano-TiO 2 Treatment of simulated organic wastewater:

[0035] Take Degussa company P25 nanometer TiO 2 1g, the contact angle is 13°, figure 1 (a) and figure 2 (a) The particle size distribution and Fourier transform infrared spectrum of the powder in water are given respectively. The average particle size of the powder in water is 107.2nm, and the polydispersity index is 1.78. Prepare the suspension according to the mass ratio of powder: water = 1:20, ultrasonically disperse for 35 min, the ultrasonic frequency is 20 Hz, and the power is 950W, and then add organic pollutants into it according to the volume ratio of nitrobenzene: water = 1:20, The blend system was obtained by shearing and emulsifying for 3 minutes in a high-speed disperser with a rotating speed of 18000 r / min.

[0036] The oil-in-water wastewater emulsion was placed under simulated sunlight (300 W visible halogen lamp), reacted for 3 h, and the wastewater degradation rate was 32%. ...

Embodiment 2

[0038] Nano-TiO modified with salicylic acid 2 Treatment of simulated organic wastewater:

[0039] Dissolve 0.75 g salicylic acid in 30 mL ethanol, and then add 1.5 g Degussa P25 nano TiO 2 Add it to the above mixed solution, and react with ultrasound at 25°C for 10 minutes, ultrasonic frequency 20 Hz, power 950 W, then let it stand for 24 hours, vacuum filter, wash with ethanol 3 times to remove free acid on the surface, freeze-dry for 48 hours , to obtain modified nano-TiO 2 powder, test figure 1 (b) shows that the average particle size of the powder in water is 64nm, and the polydispersity index is 0.875. figure 2 (b) The stretching vibration peaks of the benzene ring appearing in the infrared spectrum (1683 and 1464 cm -1 ) and ester group characteristic peak (1713cm -1 ) confirmed the successful modification.

[0040] Modified TiO 2 Powder, prepare suspension according to the mass ratio of powder: water = 1:20, ultrasonically disperse for 30 min, ultrasonic freque...

Embodiment 3

[0043] Nano TiO modified by the method of the present invention 2 Treatment of simulated organic wastewater:

[0044] Dissolve 0.5 g salicylic acid in 10 mL ethanol, 0.5 g arginine in 5 mL water, then mix the two solutions, and add 2 g Degussa P25 nano TiO 2 Add it into the above mixed solution, and react with ultrasound at 15°C for 10 minutes, ultrasonic frequency 20 Hz, power 950 W, then stand still for 12 hours, vacuum filter, wash with ethanol 3 times to remove free acid on the surface, freeze-dry for 48 hours , to obtain amphiphilic nano-TiO modified by salicylic acid and arginine 2 Powder, the powder contact angle is 75°. figure 1 (c) shows that the average particle size of the powder in water is 36nm, and the polydispersity index is 0.425. figure 2 (c) The stretching vibration peaks of the benzene ring appearing in the infrared spectrum (1683 and 1464 cm -1 ), ester group characteristic peak (1713cm -1 ), -NH 2 Characteristic peaks (3074 and 3099cm -1 ) confirme...

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Abstract

Belonging to the technical field of catalyst preparation and application, the invention discloses an amphiphilic nano TiO2 powder catalyst, a preparation method and a use method thereof. According to the invention, liquid phase impregnation is firstly adopted for modification of TiO2, two surface modification substances are introduced to make the modified TiO2 have a contact angle of 75-85 degrees and an amphiphilic surface; then the amphiphilic catalyst powder is subjected to ultrasonic dispersion in high concentration organic wastewater so as to be more conducive to formation of a stable Pickering emulsion, and photocatalytic degradation of high concentration organic wastewater is carried out under simulated solar illumination to achieve the purpose of wastewater treatment. The amphiphilic nano TiO2 powder catalyst provided by the invention is practical and is convenient to operate, can reach efficient degradation of wastewater based on low treatment cost, and can reach a degradation rate up to 99%.

Description

technical field [0001] The invention relates to an amphiphilic nano TiO 2 The powder catalyst and its preparation method and use method belong to the technical field of catalyst preparation and application. Background technique [0002] Organic pollutants, especially aromatic pollutants have very little solubility in water, so high-concentration pollutants usually float on the water surface or sink to the bottom in the form of oil film, which is extremely harmful to water bodies and may flow into the food chain to threaten human health , has the characteristics of great harm, long residual time, and difficult to degrade. Among the many treatment methods that have been reported, physical methods are time-consuming and costly. Advanced oxidation technology has the characteristics of low cost, high efficiency, high degree of mineralization, and no secondary pollution. Especially the use of TiO 2 Photocatalytic technology, which can directly utilize solar energy, is a hotspot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/38C02F1/30
CPCY02W10/37
Inventor 张巧玲罗莹李磊刘有智祁贵生申红艳栗秀萍高璟
Owner ZHONGBEI UNIV
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