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Modified hydrotalcite, preparation method and applications thereof

A technology for modifying water and hydrotalcite, which is applied in the field of soil pollution control, can solve the problems of lack of reports, etc., and achieve the effects of enhancing dispersion, strong ion exchange capacity, and promoting ion exchange reactions

Inactive Publication Date: 2020-01-17
SICHUAN UNIV
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  • Description
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Problems solved by technology

In recent years, modified hydrotalcites are mostly used to remove anions in water bodies, but there is a lack of relevant reports on soil anion passivation restoration.

Method used

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  • Modified hydrotalcite, preparation method and applications thereof
  • Modified hydrotalcite, preparation method and applications thereof
  • Modified hydrotalcite, preparation method and applications thereof

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Embodiment Construction

[0026] The specific technical solutions of the present invention are described in conjunction with the examples.

[0027] The test soil in this embodiment is sandy loam in Shuangsheng Town, Shifang City, Sichuan Province, and the land use type is cultivated land. Shifang's long-term open combustion of high-fluorine coal and a large number of phosphorus chemical industries have caused Shifang soil fluorine pollution, making Shifang an endemic fluorosis area. After the soil was collected, it was air-dried and passed through 10-mesh, 60-mesh, and 100-mesh sieves for use. The physical and chemical properties of the soil were measured in Table 1. Magnesium aluminum hydrotalcite was purchased from Shandong Youso Chemical Co., Ltd.

[0028] Table 1 Basic physical and chemical properties of the tested soil

[0029]

[0030] The preparation method of modified hydrotalcite:

[0031] Put the aluminum-magnesium hydrotalcite into a muffle furnace, the molar ratio of aluminum and magn...

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Abstract

The invention provides a modified hydrotalcite preparation method, which comprises: putting aluminum-magnesium hydrotalcite into a muffle furnace, heating to 480 DEG C at a heating rate of 5 DEG C.min<-1>, and roasting for 5 h; grinding, and screening with a 200-mesh sieve to obtain roasted modified hydrotalcite; and carrying out intercalation modification on the roasted modified hydrotalcite by using sodium dodecyl benzene sulfonate or diethyltriaminepentaacetic acid. According to the invention, the hydrotalcite is properly modified, so that the agglomeration can be reduced, and the dispersity is enhanced; and the interlayer ions are changed, so that the ion exchange reaction is promoted, and the high ion exchange capacity is achieved.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a modified hydrotalcite and its preparation method and application. Background technique [0002] Usually, the fluorine in groundwater, drinking water and food comes from soil, so the research on remediation of fluorine pollution in soil has received extensive attention. At present, the remediation technology of fluorine-contaminated soil is concentrated on chemical passivation remediation, soil leaching remediation, electric remediation and phytoremediation technology, etc. Among them, chemical passivation remediation technology is widely used due to its advantages of simple operation, low cost and high adsorption efficiency. Clay minerals as passivators to remediate fluorine pollution in soil have received widespread attention. [0003] Clay minerals are the main minerals that make up soil and widely exist in soil. Its special layered structure and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00B01J20/08B01J20/30C09K17/40
CPCB01J20/08C09K17/40C01F7/785
Inventor 杨金燕付钰涵于雅琪
Owner SICHUAN UNIV
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