A kind of nano-titanium dioxide photocatalytic degradation agent and preparation method thereof
A technology of nano-titanium dioxide and nano-silicon dioxide, which is applied in the field of nano-titanium dioxide photocatalytic degradation agent and its preparation, can solve the problems of degradation and unsatisfactory water purification effect, achieve mild and easy-to-control preparation conditions, increase contact area, improve efficiency effect
Active Publication Date: 2019-05-10
东北大学秦皇岛分校
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Problems solved by technology
[0004] However, the existing titanium dioxide is used as a photocatalytic degradation agent, and its degradation effect and water purification effect are not ideal.
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Embodiment 1
[0038] A preparation method of nano titanium dioxide photocatalytic degradation agent, comprising the following steps:
[0039] S1, preparation of nano-silica modified phenolic resin:
[0040] S1.1. Take 90g of silica sol in a 500ml beaker, add 80mL of absolute ethanol, then stir until a gel is formed, centrifuge to obtain a precipitate, put the precipitate in an oven to dry, and obtain nano-silica;
[0041] S1.2. Put a three-necked flask in a water bath, put 2.8g NaOH, 188g phenol and 10mL water into the three-necked flask, and stir mechanically for 30min at 50°C;
[0042] S1.3. Take 292g of formaldehyde solution with a mass fraction of 37%, put 90g of nano silicon dioxide prepared in S1.1 into it, and stir evenly with magnetic force;
[0043] S1.4. Raise the temperature of the water bath to 60°C, and add the formaldehyde mixture obtained in S1.3 three times every 10 minutes; after adding the formaldehyde mixture, keep the temperature at 60°C and react for 4 hours;
[0044]...
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The invention belongs to the technical field of wastewater treatment, and specifically discloses a nano-titanium dioxide photocatalytic degradation agent and a preparation method thereof. Its structure is: nano-titanium dioxide particles are evenly distributed on the surface of phenolic resin hollow microspheres. The preparation method includes the following steps: S1, under alkaline conditions, use nano-silica, phenol, and formaldehyde to undergo condensation polymerization to prepare nano-silica-modified phenolic resin; S2, prepare nano-silica-modified phenolic resin prepared in S1 Resin and nano-titanium dioxide compound; after compounding, add sodium hydroxide solution until the silicon dioxide is completely dissolved, separate, dry, and finally sinter at 450-550°C for 12-48 hours under nitrogen atmosphere to obtain nano-titanium dioxide photocatalytic degradation agent . The obtained nano-titanium dioxide photocatalytic degradation agent has good photodegradation efficiency; the preparation method is easy to operate.
Description
technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a nano-titanium dioxide photocatalytic degradation agent and a preparation method thereof. Background technique [0002] In recent years, the total amount of wastewater discharge in the country has shown a trend of increasing year by year, causing serious damage to the ecological environment and threatening the safety of water for people's survival. In-depth optimization to reduce the COD, BOD and chromaticity value of wastewater will greatly improve the overall situation. [0003] Titanium dioxide, a semiconductor with a wide bandgap, has attracted extensive attention from researchers for its excellent photoelectric, photochemical and other properties, as well as its simple preparation process. Due to its high Fermi energy level, strong oxygen adsorption capacity and hydroxylation, and stable chemical properties, it has photocatalytic oxidation performa...
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IPC IPC(8): B01J31/38C02F1/30
CPCC02F1/30B01J31/38C02F2305/10B01J35/39B01J35/40B01J35/51
Inventor 李轩王海旺李颖魏新芳唐嘉玮杨佩涛靳凯沈鑫圆李秋林
Owner 东北大学秦皇岛分校