Modified halloysite composite material and application thereof
A composite material and halloysite nanotube technology, applied in the field of modified halloysite composite materials, can solve problems such as poor heavy metal adsorption effect, and achieve the effects of preventing condensation and increasing contact area.
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Embodiment 1
[0046] with attachedfigure 1 The shown process flow prepares the modified halloysite composite material, which specifically includes the following steps:
[0047] (1) Add 2.0 g of halloysite nanotubes (HNTs) into the reaction vessel, add 200 mL of deionized aqueous solution, and obtain a suspension by stirring and ultrasonication;
[0048] (2) Add 0.4 g of dopamine hydrochloride to the suspension obtained in step (1), adjust the pH value to 8.5 with Tris-HCl buffer, perform magnetic stirring at room temperature, and the stirring reaction time is 24h, and centrifugation after the reaction is completed ;
[0049] (3) Wash the solid sample obtained in step (2), dry it at 60° C. for 12 h, and grind it to prepare dopamine-modified halloysite nanotubes, which are denoted as P-HNTs;
[0050] (4) add 1.0g of P-HNTs in the container, add the mixed solution of 200mL deionized water and absolute ethanol, the volume ratio of water and absolute ethanol is 4:1, obtain suspension by stirrin...
Embodiment 2
[0058] The configuration of uranium standard solution and the determination method of uranium concentration are as follows:
[0059] Configuration of uranium standard solution: Accurately weigh 2.1095g of uranyl nitrate hexahydrate, dissolve it in a beaker with deionized water, fully dissolve it and transfer it to a 1L volumetric flask, and use 1% nitric acid to dilute to volume. Uranium solutions of different concentrations were obtained by diluting the stock solution.
[0060] The determination method of uranium concentration is as follows: trace amount of uranium is determined by spectrophotometry. The color is developed in a 10mL colorimetric tube; the maximum absorption wavelength is 651nm, the addition amount of the solution to be tested is 2mL, the addition amount of 0.1mol / L HCl is 500μL, the addition amount of 500mg / L arsine azo III is 2mL, the masking agent The amount of EDTA added was 1 mL.
[0061] Drawing of the standard curve: Take a part of the prepared mother...
Embodiment 3
[0072] The modified halloysite composite (P-HNTs@nZVI) prepared in Example 1 was used for uranium adsorption. The specific steps and results are as follows:
[0073] Take five groups of uranium-containing wastewater, adjust the pH of the uranium-containing wastewater to 6.0, the concentration of uranium in the wastewater to be 20 mg / L, and the volume of the uranium wastewater to be 50 mL, and add 0.005, 0.010, 0.015, 0.020, 0.025 g of P-HNTs@ nZVI, the mass concentration of the material is 0.1, 0.2, 0.3, 0.4, 0.5g / L, put it into a constant temperature oscillator, the speed is 180rpm, and the reaction is 5h. After shaking, it is quickly filtered. The filtrate is taken, and the concentration of uranium ions in the solution after adsorption is measured and calculated. , the results are shown in the appendix Image 6 .
[0074] like Image 6 As shown, with the increase of the dosage of P-HNTs@nZVI, the adsorption capacity gradually decreased. When the dosage was 0.1 g / L, the ad...
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