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Sodium alginate/dissimilar metal MOFs hollow nanocage hybrid membrane as well as preparation and application

A sodium alginate and heterometallic technology, applied in chemical instruments and methods, separation/purification of hydroxyl compounds, membrane technology, etc., can solve problems affecting membrane stability, poor interface interaction, easy to form defects, etc., and achieve good operation The effects of stability, high selectivity, and easy availability of raw materials

Inactive Publication Date: 2018-01-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface between polymers and inorganic particles is poor, and defects are easy to form, which affects the stability of the film.

Method used

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  • Sodium alginate/dissimilar metal MOFs hollow nanocage hybrid membrane as well as preparation and application
  • Sodium alginate/dissimilar metal MOFs hollow nanocage hybrid membrane as well as preparation and application
  • Sodium alginate/dissimilar metal MOFs hollow nanocage hybrid membrane as well as preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Preparation of sodium alginate / heterometallic MOFs hollow nanocage hybrid membrane, the steps are as follows:

[0018] Step 1. Preparation of a heterometallic MOFs hollow nanocage: Dissolve 1.2g iron acetylacetonate, 0.928g zinc nitrate hexahydrate and 0.192g terephthalic acid in a mixed solution of 512mL N,N-dimethylformamide and ethanol 4g of polyvinylpyrrolidone was added to it, and after magnetic stirring at room temperature for 10min, the reddish-brown solution was transferred to a hydrothermal kettle and reacted at 100°C for 3h to obtain an orange-red precipitate; the orange-red precipitate Sequentially wash with N,N-dimethylformamide and ethanol and dry in a vacuum oven at 40°C for 12 hours to obtain an orange powdery solid, which is a hollow nanocage of heterometallic MOFs, specifically, the radial size of the particle is about 150nm , Fe with a pore size of about 6.4 nm III -HMOF-5.

[0019] Step 2, film formation: Weigh 0.0102g of heterometallic M...

Embodiment 2

[0021] Example 2, preparation of sodium alginate / heterometallic MOFs hollow nanocage hybrid membrane, the steps are as follows:

[0022] The preparation process is basically the same as in Example 1, except that in step 2, the amount of heterometallic MOFs hollow nanocages dissolved in 25 mL of deionized water is changed from 0.0102 g to 0.0306 g; finally sodium alginate / heterometallic MOFs hollow nanocage hybrid membrane (membrane 2), the surface electron microscope image of membrane 2 is as follows figure 2 shown.

[0023] Membrane 2 is used for pervaporation ethanol dehydration, and the permeation flux is 1540g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 3423, such as Figure 5 shown.

Embodiment 3

[0024] Example 3, preparation of sodium alginate / heterometallic MOFs hollow nanocage hybrid membrane, the steps are as follows:

[0025] The preparation process is basically the same as in Example 1, except that in step 2, the amount of heterometallic MOFs hollow nanocages dissolved in 25 mL of deionized water is changed from 0.0102 g to 0.051 g; finally sodium alginate / heterometallic MOFs hollow nanocage hybrid membrane (membrane 3), the surface electron microscope image of membrane 3 is shown in image 3 shown.

[0026] Membrane 3 is used for pervaporation ethanol dehydration, and the permeation flux is 1380g / m under the conditions of 76°C and raw material concentration of 90 / 10wt% (ethanol / water) 2 h, the separation factor is 2215, such as Figure 5 shown.

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Abstract

The invention discloses a sodium alginate / dissimilar metal MOFs hollow nanocage hybrid membrane. The hybrid membrane comprises sodium alginate and dissimilar metal MOFs hollow nanocages according to amass ratio 100:2-10; wherein, dissimilar metal MOFs hollow nanocages are prepared by ferric acetylacetone, zinc nitrate hexahydrate and terephthalic acid according to a mass ratio 75:58:12. The preparation comprise the following steps: firstly dissimilar metal MOFs hollow nanocages are obtained; then, the dissimilar metal MOFs hollow nanocages are dispersed in deionized water, the material and sodium alginate are blended in order to prepare a casting solution, spin coating of the casting solution is carried out for a polyacrylonitrile basal membrane, drying, crosslinking and redrying are carried out in order to prepare the hybrid membrane. The product has the advantages of simple preparation process, good controllability, easily available raw materials, general methods, and the like. Thehybrid membrane is used for pervaporation of an ethanol-aqueous solution system, and has high permeation flux and high selectivity for water molecules, and at the same time, the hybrid membrane has good operation stability at a high temperature.

Description

technical field [0001] The invention relates to a sodium alginate / heterometallic MOFs hollow nanocage hybrid membrane and its preparation and application, belonging to the technical field of polymer-inorganic hybrid membranes. Background technique [0002] In recent years, with the rapid development of social economy and the rapid growth of world population, the world's energy consumption has increased significantly, and the energy crisis has become one of the five major issues worthy of global human attention. At present, the development of new renewable energy that can replace petroleum and other fossil energy is an effective means to alleviate the global energy shortage and achieve sustainable economic and social development. Fuel ethanol is a typical renewable liquid fuel, which has important advantages in environmental protection and energy saving. Ethanol dehydration is an important step in the production of environmentally friendly petroleum alternative fuel-fuel eth...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/02B01D67/00C07C29/76C07C31/08
Inventor 姜忠义程暄暄潘福生程小坡郭松杨昊
Owner TIANJIN UNIV
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