Novel ceramic nanofiltration membrane preparation method

A ceramic nanofiltration membrane, ceramic ultrafiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of membrane cracking, high process requirements, complicated operation, etc. Craftsmanship requires simple effects

Active Publication Date: 2016-07-20
NANJING UNIV OF TECH
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Problems solved by technology

[0005] The present invention provides a novel method for preparing ceramic nanofiltration membranes in order to avoid the deficiencies in the existing ceramic nanofiltration membrane preparation technology, aiming to solve the problems of high technological requirements and complicated operations in the preparation process of ceramic nanofiltration membranes. problem, to avoid the occurrence of cracking of the film layer

Method used

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  • Novel ceramic nanofiltration membrane preparation method
  • Novel ceramic nanofiltration membrane preparation method

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Embodiment 1

[0022] Using ceramic ultrafiltration membranes with an average pore size of about 5, 10 and 20nm as the carrier, the corresponding molecular weight cut-offs are 10, 50 and 250kDa, and the corresponding pure water fluxes are 40, 120 and 310L m -2 h -1 · bar -1 . Titanium isopropoxide is used as a precursor, and isopropanol is used as a solvent. A 20wt% precursor solution was prepared, and a ceramic ultrafiltration membrane dried at 200°C was immersed in it so that it was completely infiltrated by the solution under capillary force. Take it out after soaking at room temperature for 10 hours, and dry it in a ventilated place at room temperature. Then, the samples were transferred to an oven at 60 °C for 20 h to dry. Finally, the samples were calcined in a muffle furnace at 600 °C for 0.5 h with a heating rate of 0.1 °C / min. After the sample is cooled with the furnace, TiO 2 Nanofiltration. The TiO 2 The pore diameters of nanofiltration membranes are about 1.4, 1.6 and 2.2...

Embodiment 2

[0024] With three kinds of TiO obtained in embodiment 1 2 Nanofiltration membrane as carrier. Titanium isopropoxide is used as a precursor, and a mixture of isopropanol and ethanol with a mass ratio of 2:1 is used as a solvent. Prepare a 0.1wt% precursor solution and dry TiO at 150°C 2 The nanofiltration membrane is immersed in it so that it is completely wetted by the solution under capillary force. Take it out after immersing at room temperature for 1 hour, and dry it in a ventilated place at room temperature. Subsequently, the samples were dried in an oven at 180 °C for 0.5 h. Finally, the sample was calcined at 450 °C for 1 h in a muffle furnace with a heating rate of 1 °C / min. After the sample is cooled with the furnace, TiO 2 Nanofiltration. TiO with an average pore size of approximately 1.4, 1.6 and 2.2 nm 2 Nanofiltration membrane is used as the carrier to obtain TiO with smaller pore size 2 The pore diameters of nanofiltration membranes are about 1.2, 1.4 and ...

Embodiment 3

[0026] Al with an average pore size of about 5 nm 2 o 3 、TiO 2 and ZrO 2 The ultrafiltration membrane is used as the carrier, the corresponding molecular weight cut-off is about 10kDa, and the corresponding pure water fluxes are 40, 62 and 54L m -2 h -1 · bar -1 . A mixture of titanium isopropoxide and zirconium isopropoxide at a molar ratio of 1:1 is used as a precursor, and isopropanol is used as a solvent. A 10wt% precursor solution was prepared, and a ceramic ultrafiltration membrane dried at 110°C was immersed in it so that it was completely infiltrated by the solution under capillary force. Take it out after soaking at room temperature for 20 hours, and dry it in a room temperature ventilated place. Then, the samples were transferred to an oven at 70 °C for 2 h to dry. Finally, the samples were calcined in a muffle furnace at 350 °C for 4 h with a heating rate of 5 °C / min. After the sample is cooled with the furnace, a series of ZrO 2 -TiO 2 Composite nanofilt...

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Abstract

The invention relates to a novel ceramic nanofiltration membrane preparation method. The method includes: dissolving a precursor into an organic solvent to obtain a precursor solution; drying to-be-treated ceramic ultrafiltration membranes; impregnating the dried ceramic ultrafiltration membranes into the precursor solution until complete impregnation is realized, taking out, airing, drying and calcining to obtain ceramic nanofiltration membranes. By addition of active components to pore passages of the ceramic ultrafiltration membranes and in-situ hydrolysis reaction of the active components, ceramic nanoparticles are obtained in the pore passages of the membranes after thermal treatment, and accordingly regulation of membrane pore diameters can be realized; by control of precursor types, precursor concentration, solvents, thermal treatment process and the like, continuous regulation of the pore diameters of the ceramic ultrafiltration membranes can be realized. Due to freeness of new membrane layers formed on the surfaces of the ceramic ultrafiltration membranes, the problem of proneness to cracking of the membrane layers in preparation of the ceramic nanofiltration membranes is avoided, and a series of ceramic nanofiltration membranes different in material and microstructure can be obtained. The novel ceramic nanofiltration membrane preparation method is a novel method for preparing the ceramic nanofiltration membranes.

Description

technical field [0001] The invention relates to a preparation method of a novel ceramic nanofiltration membrane, belonging to the technical field of membrane material preparation. Background technique [0002] Membrane separation refers to the process of separating, grading, purifying and enriching two-component or multi-component mixed gas or liquid with the help of selective osmosis of membrane and external energy or chemical potential difference as the driving force. Membrane technology with membrane materials as the core is a new type of high-efficiency separation technology. With its energy saving and environmental friendliness, it has become one of the common technologies to solve major problems in the fields of energy, water resources, and environment faced by human beings. It plays an important role in economic development, national technological progress and enhancement of international competitiveness, and is increasingly valued by the government. Nanofiltration (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0039B01D71/02
Inventor 范益群陈献富邱鸣慧张云
Owner NANJING UNIV OF TECH
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