Surface-modified inorganic matrix and method for preparation thereof

A matrix, inorganic technology, applied in chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of negative impact of phosphorus environment, limitation, sensitivity to nucleophilic attack, etc., to achieve a high degree of functionalization, improve stability, improve The effect of stability

Active Publication Date: 2015-04-08
VLAAMSE INSTELLING VOOR TECHNOLOGISCH ONDERZOEK NV VITO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, depending on the type of solvent used and at high flux rates, leaching of organic functional groups can also be a problem due to the complex's susceptibility to nucleophilic attack
Additionally, phosphorus is known to have a negative impact on the environment
Also, the amount of organic functional groups available on phosphonic acids is limited
[0009] In view of the above, although methods for the surface modification of ceramic membranes exist in the prior art, these methods are limited in various ways, for example, for modification with different types, numbers of organic functional groups, methods practicality, etc.
[0010] Furthermore, the surface-modified ceramic membranes that can be obtained with the above methods sometimes show insufficient thermal and / or hydrothermal stability
More specifically, an important problem with prior art modified ceramic membranes is that they sometimes exhibit considerable release (leakage) of bound organic functional groups, especially under harsh operating conditions

Method used

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  • Surface-modified inorganic matrix and method for preparation thereof
  • Surface-modified inorganic matrix and method for preparation thereof
  • Surface-modified inorganic matrix and method for preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0148] Example 1: Modified unsupported TiO according to the invention 2 Film layer preparation

[0149] As commonly used to prepare TiO with a pore size of 3 to 5 nm 2 As in the top layer of the membrane, unsupported TiO was produced by preparing a sol 2 film layer. Recipes for such preparations are known in the art and can be found, for example, in the following publications T. Van Gestel, C; Vandecasteele, A. Buekenhoudt, C. Dotremont, J. Luyten, R. Leysen, B. Van der Bruggen, G. Maes, J. Membr. Sci, 207, 2002, pp. 73-89. Specifically, for this example, titanium tetraisopropoxide (Ti(OC 3 h 7 ) 4 ) (TTI, supplied by Acros Organics) to prepare the sol. Use HNO 3 Peptization of the sol is obtained. Then, as in the preparation of real TiO 2 In the case of the mesoporous membrane top layer the same amount of additional solvent and binder was added. However, instead of dip-coating the porous membrane support with the sol-containing diluted binder as is done in membrane...

Embodiment 2

[0152] Example 2: Powdered unsupported TiO modified according to the invention 2 Characterization of the film layer

[0153] Untreated TiO was prepared as described in Example 1 2 Powder, BuOH pretreated TiO 2 powder, and C1-modified TiO after BuOH pretreatment 2 powder. figure 1 A shows untreated TiO 2 Powder, BuOH pretreated TiO 2 C1 modified TiO after powder and BuOH pretreatment 2 Thermogravimetric analysis (TGA) of the powder, figure 1 B shows the corresponding differential temperature gradient (DTG). These results show weight loss over different temperature intervals. Alcohol pretreatment resulted in weight loss from 230 °C to 430 °C due to the formation of weak Ti-O-C bonds. After modification with methylorganomagnesium compounds, a weight loss above 430 °C was measured due to metal-carbon covalent bonding (at M 1 -C in the case of Ti-C).

[0154] Untreated TiO was prepared as described in Example 1 2 Powder and BuOH pretreated TiO 2 powder. In a similar m...

Embodiment 3

[0157] Example 3: Powdered unsupported TiO modified according to the invention using different solvents 2 Film layer preparation and characterization

[0158] In this example, powdered unsupported TiO 2 The film layer material is modified, the difference is that different solvents are used for the reaction with the alkyl organic magnesium bromide in step d. The reaction was carried out in diethyl ether (DEE), tetrahydrofuran (THF) and cyclopentyl methyl ether (CPME) by the method described. MeOH was used as the alcohol for pretreatment, and octylorganomagnesium bromide was used as the organomagnesium compound. These modified unsupported TiO 2 The TGA results of the films showed weight loss above 430 °C, indicating the formation of M in all solvents 1 -C covalent bond. The PAS-IR spectra of these materials are in Figure 4 The stretching vibrations of the C–H bonds of the octyl functional groups of all powders are given and shown in .

[0159] Also the modified TiO 2 Th...

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Abstract

The present invention relates to a method for the modification of metal hydroxide and / or metal oxide surfaces of an inorganic matrix with an organometallic reagent for obtaining an organic functionalized matrix suitable for filtration processes. The method involves the direct covalent binding of organic functional groups by allowing a pre-treated matrix to react with organometallic reagents in the present of a suitable solvent. The present invention further relates to an organic functionalized matrix obtainable or obtained by carrying out a method according to the invention. The invention also provides various uses of a surface-modified matrices as described herein in various industrial applications, including for instance in filtration and / or adsorption and / or separation processes, or as support, e.g. for catalyst systems or for enzyme systems.

Description

technical field [0001] The present invention relates to the field of surface modification of metal hydroxide and / or oxide surfaces of inorganic substrates. In particular, the present invention provides methods for modifying metal hydroxide and / or metal oxide surfaces of inorganic substrates with organometallic reagents to obtain organic functionalized substrates suitable for use in filtration processes. The present invention involves the direct covalent bonding of one or more different organofunctional moieties to the surface of said substrate through the application of organometallic chemistry. The invention also relates to surface-modified inorganic substrates and various industrial uses of the surface-modified substrates according to the invention. Background technique [0002] Ceramic membranes are made from inorganic materials such as alumina, titania, and zirconia (including mixtures thereof) and have benefits due to their properties, especially over polymeric membran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D2323/04B01D69/12B01D67/0093B01D2323/38B01D67/00B01D69/02B01D71/02
Inventor 阿妮塔·比肯霍德特肯尼·温斯韦拉·梅嫩贝尔特·梅斯彼吉耶·库尔
Owner VLAAMSE INSTELLING VOOR TECHNOLOGISCH ONDERZOEK NV VITO
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