A kind of aminated humic acid-nano silica composite material and its preparation method and application
A composite material and humic acid technology, which is applied in the field of aminated humic acid-nano-SiO2 composite material and its preparation, can solve the problems of increasing the content of active functional groups, enhancing the water solubility of humic acid, and limiting the content of active groups, so as to increase the activity The effect of group content, improvement of chemical reactivity, and excellent adsorption performance
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Embodiment 1
[0045] (1) Accurately weigh 1.0 g of humic acid (HA) and 30 mL of deionized water, add them to a 100 mL three-necked bottle in turn, and stir slowly at room temperature for 30 min. Add 15% sodium hydroxide solution dropwise to adjust the pH of the solution to be between 9 and 12. 2After stirring for 10 min under protection, 5.32 mL of formaldehyde solution was slowly added dropwise, the temperature was raised to 85° C., and the temperature was pre-reacted for 1 h. Then add 5.35mL diethanolamine, then raise the temperature to 95°C, stop the reaction after 2.5h, cool to room temperature, adjust the pH to between 4 and 5 with sulfuric acid, reheat to 98°C for 4.5h, filter after the reaction, and Dry in a vacuum oven at 50°C for 48 hours to obtain diethanolamine-modified aminated humic acid (HA-D).
[0046] (2) Weigh 1.5g of aminated humic acid and 1.0g of nano-SiO 2 , placed in a three-necked bottle with a capacity of 100mL, sequentially added 10mL of deionized water and 30mL o...
Embodiment 2
[0051] Compared with Example 1, the only difference is that in step (1), the ligand used is triethylenetetramine, and the remaining conditions and steps are the same as in Example 1.
[0052] What this embodiment obtains is triethylenetetramine-modified aminated humic acid (HA-T) and triethylenetetramine-aminated humic acid-nanometer SiO 2 Composite material (HA-T-S).
[0053] Humic acid (HA), aminated humic acid (HA-T) and aminated humic acid-nanometer SiO prepared by FTIR 2 The three materials of the composite material (HA-T-S) were measured and characterized, and the infrared spectrum is shown in Figure 6 . It can be seen that in HA-T, 2960.93cm -1 and 2806.94cm -1 Stretch vibration peak attributed to C-H, 1655.31cm -1 A strong characteristic absorption peak appears, while at 1730cm -1 None nearby, and at 1127.71cm -1 and 1034.88cm -1 The absorption peak generated at is mainly the stretching vibration of C-N-C, indicating that humic acid passes through formaldehyde...
Embodiment 3
[0057] Compared with Example 1, the only difference is that in step (1), the ligands used are 3-amino-5-hydroxypyrazole, 4-amino-1,2,4-triazole, 4-aminoanti Pyrine, 5-aminobenzimidazolone, ethylenediamine, 2,6-diaminopyridine and D-Asparagine (D-Asparagine), the rest of the conditions and steps are the same as in Example 1, to explore the ligand pair amine Humic Acid-Nano SiO 2 Effect of nitrogen content in composites.
[0058] The prepared aminated humic acid-nanometer SiO was analyzed by Vario EL III elemental analyzer 2 The N element content in the composite material is measured, and the nine kinds of aminated humic acid-nano-SiO prepared in Examples 1-3 2 The elemental analysis results of the composite materials are shown in Table 1.
[0059] Table 1 Nine kinds of aminated humic acid-nano-SiO 2 Elemental Analysis Results of Composite Materials
[0060]
[0061] As can be seen from Table 1, the diethanolamine aminated humic acid-nanometer SiO synthesized after the m...
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