Preparation method and application of a hollow fiber ceramic membrane with double persulfate activation function

Abstract

The invention provides a method for preparing a hollow fiber ceramic membrane with double persulfate activation function, comprising the following steps: using Al 2 o 3 、TiO 2 and CuO powder as ceramic raw materials, the solution spinning method is used to obtain the hollow fiber ceramic support layer precursor, and the hollow fiber ceramic support layer is obtained after sintering, and then the active catalytic material is attached to the surface of the hollow fiber ceramic support layer by dipping and pulling method, After calcining, a surface-active catalytic layer with persulfate activation function is formed and loaded on the hollow fiber ceramic support layer to obtain the target product. The hollow fiber ceramic membrane of the invention has good organic pollutant degradation ability, anti-pollution ability and high bending strength.

Description

technical field [0001] The invention belongs to the field of drinking water purification and waste water treatment, and in particular relates to a preparation method and application of a hollow fiber ceramic membrane with double persulfate activation function. Background technique [0002] Membrane separation is a physical filtration process that does not undergo phase change and can be carried out at room temperature. It has the advantages of low energy consumption, high separation efficiency, short process flow, convenient operation, and no secondary pollution. It is used in drinking water purification and sewage It has a wide range of applications in the field of wastewater treatment and recycling. In recent years, with the maturity of inorganic ceramic membrane preparation technology and the rapid development of low-cost ceramic membrane materials, the application of ceramic membranes in drinking water and sewage treatment has received more and more attention. Compared ...

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Problems solved by technology

[0003] However, hollow fiber ceramic membranes also have their own problems in practical engineering applications: first, the ability to remove soluble toxic organic pollutants in water is poor, and hollow fiber ceramic membranes are generally used as ultrafiltration or microfiltration in the field of water treatment. Its pore size ranges from a few nm to hundreds of nm, and the molecular weight of most dissolved toxic organic compounds is only a few hundred Daltons. It is difficult for hollow fiber ceramic membranes to effectively remove them through sieving and retention, and it still needs to be combined with other processes such as oxidation, The combined use of adsorption and other methods can ensure the water treatment effect; second, hollow fiber ceramic membranes have membrane pollution problems in practical applications. For example, hollow fiber ceramic membranes will be polluted by natural organic matter in surface water treatment, especially during long-term operation. Irreversible membrane fouling will still occur; third, the hollow fiber ceramic membrane itself is brittle, and it is easy to break during the packaging process of the module or under other external pressures. At present, due to Al 2 o 3 With excellent chemical stability, thermal stability and easy availability, most hollow fiber ceramic membranes use Al 2 o 3 As the main material, powder is prepared by a combination of phase inversion and sintering technology, but due to the 2 o 3 With a strong Al-O ionic bond, a higher sintering temperature (generally above 1500°C) is required to make the hollow fiber membrane reach the usable bending strength, resulting in higher preparation costs

The above three problems are the main reasons that restrict the large-scale application of hollow fiber ceramic membranes in the field of water treatment

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