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Preparation method of visible light catalytic composite ultrafiltration membrane

A visible light and ultrafiltration membrane technology, applied in the field of photocatalysis, can solve the problems of easy loss and difficult recovery of powdered catalysts, and achieve the effects of improved physical and chemical properties, reasonable structure, and small powder particle size

Inactive Publication Date: 2017-05-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the powdery catalyst in the current suspension system is easy to lose, difficult to recover, and the pure physical interception in the membrane separation technology produces a concentrated solution, thereby providing a preparation method for a visible light catalyzed composite ultrafiltration membrane

Method used

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  • Preparation method of visible light catalytic composite ultrafiltration membrane
  • Preparation method of visible light catalytic composite ultrafiltration membrane
  • Preparation method of visible light catalytic composite ultrafiltration membrane

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specific Embodiment approach 1

[0020] Specific embodiment one: the preparation method of the visible light catalytic composite ultrafiltration membrane in this embodiment is realized according to the following steps:

[0021] 1. Weigh the transition metal nitrate and titanium dioxide powder with a molar ratio of 1:50~1:500, add them to 60 mL of deionized water, mix them evenly, pour them into a polytetrafluoroethylene reactor, and put them under the condition of 120~220 ℃ After reacting for 6-24 hours, cooling to room temperature, centrifuging and washing several times, vacuum drying at 70 °C, grinding and sieving through a 300-mesh sieve to obtain a metal-doped titanium dioxide visible light catalyst;

[0022] 2. Blend the photocatalyst obtained in step 1 with the polysulfone membrane material at a mass ratio of 0.05 to 0.3, and vigorously mechanically stir it in a water bath at 30°C for 24 hours to obtain a uniformly mixed casting solution. Degassing to obtain a uniform and bubble-free casting solution; ...

specific Embodiment approach 2

[0024] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the transition metal nitrate in step 1 is copper nitrate, iron nitrate, zinc nitrate or nickel nitrate. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0025] Embodiment 3: This embodiment is different from Embodiment 2 in that: in step 1, the transition metal nitrate is ferric nitrate. Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention discloses a preparation method of a visible light catalytic composite ultrafiltration membrane. The method comprises the following steps: 1, weighing transition metal nitrate and titanium dioxide powder, adding the transition metal nitrate and the titanium dioxide powder into deionized water, mixing uniformly, pouring a polytetrafluoroethylene reaction kettle to perform reaction, cooling to room temperature, centrifugally washing for many times, performing vacuum drying, grinding and sieving to obtain a metal doped titanium dioxide visible light catalyst; 2, blending the light catalyst and a polysulfone membrane material, intensely and mechanically stirring under the water bath condition, and defoaming under the ultrasonic condition to obtain a uniform and bubble-free casting membrane solution; 3, pouring the casting membrane solution at one end of a glass plate, scraping the membrane by a glass stick with two ends tied with copper wires, performing standing, putting into coagulation bath to form a membrane, taking out and soaking into deionized water to obtain the visible light catalytic composite ultrafiltration membrane. By the method, the problem that the powdered catalyst in the current suspension system is liable to lose and difficult to recycle, and the problem of concentrated liquid generated by pure physical interception in the membrane separation technology are solved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a preparation method of a photocatalysis membrane, in particular to a preparation method of a visible light catalysis composite ultrafiltration membrane. Background technique [0002] Photocatalytic technology is an effective method to remove refractory organic matter in water, and has the advantages of simple operation process, no chemical addition, mild reaction conditions, and no secondary pollution. The most widely studied photocatalytic material is still TiO 2 , its catalytic activity and photocorrosion resistance are good, and its performance is stable, low in price, non-toxic and harmless, but TiO 2 There are problems such as low solar energy utilization rate, low quantum efficiency, poor adsorption performance, and easy agglomeration. As a means of modification, transition metals, after being doped with photocatalysts, introduce impurity levels or defect levels int...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D67/00B01D61/14C02F1/30C02F1/44C02F101/34
CPCB01D71/68B01D61/145B01D67/0079B01D69/12B01D2311/2611B01D2311/2696B01D2325/10C02F1/30C02F1/444C02F2101/345C02F2305/023C02F2305/08C02F2305/10
Inventor 张广山王鹏王侨杨春燕
Owner HARBIN INST OF TECH
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