Mesoporous bentonite and preparation method thereof

Abstract

The invention discloses mesoporous bentonite and a preparation method thereof. The mesoporous bentonite is prepared through adoption of bentonite as a raw material and operation of acid-base etching,and the preparation method of the mesoporous bentonite specifically comprises the steps: mixing the bentonite with an alkali solution for alkali etching, conducting washing until neutrality, performing drying so as to obtain alkali-etched bentonite, then mixing the alkali-etched bentonite with an acid solution for acid etching, conducting washing until neutrality, and performing drying, grinding and sieving so as to obtain the mesoporous bentonite. The mesoporous bentonite has the advantages of a high specific surface area, a large pore volume, more uniform pore size distribution, environmental friendliness and the like, and exhibits better immobilization performance as a carrier for fixation, and the preparation method of the mesoporous bentonite has the advantages of a simple preparationprocess, low preparation cost, mild reaction conditions, easy operation, easy large-scale preparation and the like.

Description

technical field [0001] The invention belongs to the field of preparing mesoporous materials by taking environmental mineral materials as raw materials and utilizing a template-free method, and relates to a mesoporous bentonite and a preparation method thereof, in particular to a mesoporous bentonite prepared by acid-base etching using bentonite as a raw material. Bentonite and its preparation method. Background technique [0002] Mesoporous materials have abundant mesoscopic pores and huge specific surface area, and have good application prospects in the treatment of pollutants in the environment, as various carriers, adsorption, and separation. Mesoporous materials are divided into ordered mesoporous materials and disordered mesoporous materials. Ordered mesoporous materials have a high dependence on the preparation process. At the same time, there are high costs and potential harm to the environment in the preparation process of ordered mesoporous materials. Disadvantages...

AI Technical Summary

Problems solved by technology

Mesoporous materials are divided into ordered mesoporous materials and disordered mesoporous materials. Ordered mesoporous materials have a high dependence on the preparation process. At the same time, there are high costs and potential harm to the environment in the preparation process of ordered mesoporous materials. Disadvantages such as large size, high energy consumption, relatively long production cycle, and many toxic and harmful reagents are used; however, disordered mesoporous materials have the problem of unsatisfactory performance, and most of the operating processes for preparing disordered mesoporous materials are the same as those of ordered mesoporous materials. The materials are similar, but there are also disadvantages such as high cost, potential harm to the environment, high energy consumption, relatively long production cycle, and the use of toxic and harmful reagents.

[0003] In response to the above shortcomings, researchers have made a lot of efforts. The improvement directions of ordered mesoporous materials mainly focus on the acquisition of cheap raw materials and the self-template method. In terms of process control in the early stage of preparation and the source of raw materials

Among them, in the improvement of ordered mesoporous materials, the acquisition of raw materials is mainly based on using cheap natural mineral resources or industrial waste as silicon or aluminum sources, which can reduce the cost of raw materials for preparing ordered mesoporous materials to a certain extent. But still need to use a certain amount of expensive templating agent

In the improvement of the preparation process of disordered mesoporous materials, similar to ordered mesoporous materials, a certain amount of expensive and harmful template agents, precursor agents, etc. are also used, which has high cost, great potential harm to the environment, and high energy consumption. , The production cycle is relatively long, the use of toxic and harmful reagents and other shortcomings

In terms of raw material sources, some researchers have used the properties of some mineral and non-mineral materials to prepare disordered mesoporous materials, such as ceramic materials, natural mineral kaolin, etc., which can reduce costs and reduce potential harm to the environment. However, using them as raw materials There are still deficiencies in the preparation process. For example, in the separation step of the preparation process using kaolin as raw material, the particles are fine, easy to agglomerate, and difficult to separate. Therefore, kaolin cannot be stably dispersed in the aqueous solution during the preparation process, which will affect the etching process. The mesoporization efficiency cannot guarantee the uniformity of the pore size distribution. The mesoporous material thus prepared has a relatively small scope of application as a carrier, and the immobilization performance is not ideal; similarly, the mesoporous material made of ceramic materials is When the material is used as a carrier, there is also the problem of unsatisfactory immobilization performance.

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