Hydrotalcite like compound-kaolin composite material and preparation method thereof
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A composite material, kaolin technology, applied in chemical instruments and methods, silicon compounds, inorganic chemistry, etc., can solve the problems of poor orientation, easy to fall off, etc.
Inactive Publication Date: 2012-09-19
EAST CHINA NORMAL UNIV
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[0008] The present invention provides a hydrotalcite-like kaolin composite material, which innovatively uses kaolin as a matrix, overcomes the technical defects of poor hydrotalcite crystal orientation an...
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Embodiment 1
[0039] (1) Pretreatment of kaolin matrix: Kaolin raw powder was roasted in a muffle furnace at a heating rate of 1 °C / min to 830 °C for 2 h. XRD characterization results of samples before and after treatment were shown in figure 2 , figure 2 (a) shows the XRD pattern of raw kaolin powder; (b) shows the XRD pattern of pretreated kaolin powder.
[0040] (2) Weigh 1.017 g MgCl 2 ·6H 2 O and 3.003 g of urea were dissolved in 20 g of deionized water, 1 g of pretreated kaolin was added, stirred for 30 min, and placed in a stainless steel autogenous pressure crystallization kettle with polytetrafluoroethylene lining, and crystallized at 80 °C for 1 day. After the reaction, wash with deionized water for 3-5 times, filter, and dry in an oven at 80°C.
[0041] In the hydrotalcite-like kaolin composite material prepared in this example, the XRD and SEM characterization results of the hydrotalcite-like flakes are as follows Figure 3(a) , Figure 3 (b) shown.
Embodiment 2
[0043] (1) Pretreat the kaolin matrix according to the method used in Example 1.
[0044] (2) Weigh 1.017 g MgCl 2 ·6H 2 O and 1.802 g of urea were dissolved in 20 g of deionized water, 1 g of pretreated kaolin was added, stirred for 15 min, crystallized at 70 °C for 7 days, washed with deionized water after the reaction, filtered, and dried at 80 °C.
[0045] In the hydrotalcite-like kaolin composite material prepared in this example, the XRD and SEM characterization results of the hydrotalcite-like flakes are as follows Figure 4(a) , Figure 4 (b) shown.
Embodiment 3
[0047] (1) Pretreat the kaolin matrix according to the method used in Example 1.
[0048] (2) Weigh 0.509 g MgCl 2 ·6H 2 O and 0.903 g of urea were dissolved in 20 g of deionized water, 1 g of pretreated kaolin was added, stirred for 30 min, crystallized at 100 °C for 16 h, washed with deionized water and filtered, and dried at 100 °C.
[0049] In the hydrotalcite-like kaolin composite material prepared in this example, the XRD and SEM characterization results of the hydrotalcite-like flakes are as follows Figure 5(a) , as shown in Figure 5(b).
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Abstract
The invention discloses a hydrotalcite like compound-kaolin composite material which comprises a hydrotalcite like compound sheet and a kaolin substrate. The hydrotalcite like compound sheet grows on the kaolin substrate, an angle between the hydrotalcite like compound sheet and the the kaolin substrate is larger than 0 and smaller than 180 degrees. The invention further discloses a preparation method of the hydrotalcite like compound-kaolin composite material. The preparation method comprises the following steps of (1) conducting pretreatment on the kaolin substrate, and enabling kaolin raw materials or microballoons molded by atomizing to rise at temperature until a high temperature condition to roast; (2) enabling urea and soluble bivalence inorganic salt to be soluble in deionized water, adding the kaolin obtained in the step (1), stirring for warming crystallization at room temperature, using the deionized water to wash, then filtering, and drying to obtain the hydrotalcite like compound-kaolin composite material. The preparation method of the hydrotalcite like compound-kaolin composite material is simple in operation and soft in condition and has wide application prospect. The hydrotalcite like compound sheet in the hydrotalcite like compound-kaolin composite material prepared by using the preparation method has the advantages of being good in orientation, not easy to drop and the like.
Description
technical field [0001] The invention relates to the technical field of anionic layered structure functional materials, in particular to a hydrotalcite-like kaolin composite material and a preparation method thereof. Background technique [0002] Hydrotalcite-like Compound is an anionic inorganic layered material whose crystal belongs to the hexagonal crystal system. It is composed of positively charged metal hydroxide laminates and anions and neutral water molecules filled between the layers. . Its general chemical formula: ,in and are divalent and trivalent metal cations located on the laminates respectively, and x is The amount fraction of the substance, A n- is an interlayer anion, and m represents the number of interlayer crystal water. The metal cations in the hydrotalcite-like laminates can be isomorphously replaced by other metal cations with a similar radius, and the interlayer anions can also be exchanged by other anions, so the hydrotalcite-like materials...
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