A modified nano-adsorption material and its preparation method
A nano-adsorption material and nano-material technology, applied in the field of modified nano-adsorption materials and its preparation, can solve the problems of easy aggregation of nanoparticles and achieve the effect of large surface area, stable chemical properties and uniform size
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Embodiment 1
[0042] Example 1. Preparation of modified nano adsorption material
[0043] The preparation of the modified nano adsorbent material includes the following steps:
[0044] 1. Using solvothermal method to prepare ZnFe 2 O 4 Nano materials: a certain amount of FeSO 4 ·7H 2 O and ZnCl 2 Add to a certain volume of ethylene glycol and water mixed solution, mix well under mechanical stirring; after stirring for 10 minutes, add 2 mL of ammonia water (mass fraction 25%) dropwise to it, continue stirring for 1 hour, the mixed solution Transfer to an autoclave, encapsulate, and cool at 180°C for 24 hours. Take out the product in the autoclave and wash it with water and ethanol 4 times. Finally, put the resulting product in an oven, dry at 60°C for 12 hours, and grind for use. The resulting sample is ZnFe with a hydrated particle size of 10-70 nm. 2 O 4 nanomaterials. Among them, FeSO 4 ·7H 2 O and ZnCl 2 The molar ratio is 2:1; the volume ratio of ethylene glycol and water in the mixed solut...
Embodiment 2
[0047] Take 20mL of the 50mg / L MB solution and place it in a stoppered conical flask, and accurately weigh 10mg of the ZnFe prepared in Example 1 of the present invention. 2 O 4 Sample and SDS-ZnFe 2 O 4 The samples were added to the methylene blue solution (natural pH 6-7), placed in a constant temperature oscillator, and oscillated at a speed of 250 rpm / min at a temperature of 25 °C. After a period of time, a part of the solution was taken out and used UV-visible spectrophotometry Method to test the concentration of residual methylene blue. Then, repeat the operation, the effect of adsorption time on adsorption capacity and its kinetic analysis are shown in figure 2 with image 3 .
[0048] Such as figure 2 As shown, (1) As time goes by, the adsorption capacity q t Shows an increasing trend. After reaching a certain long adsorption time, the adsorption capacity tends to stabilize. (2) In the whole process, the SDS-ZnFe of the present invention 2 O 4 The adsorption capacity o...
Embodiment 3
[0050] Under the condition of 25℃, with pH as a variable, investigate the effect of pH on the adsorbent ZnFe 2 O 4 Sample and SDS-ZnFe 2 O 4 The influence of sample adsorption capacity. First, weigh the SDS-ZnFe prepared in Example 1 of the present invention 2 O 4 Add 10 mg of the sample to the MB dye solution with a concentration of 50 mg / L (natural pH is 6-7), adjust the pH of the solution with HCl or NaOH to make them 2, 4, 6, 8, 10, 12, respectively Placed in a constant temperature oscillator, oscillated at 250 rpm / min for 12 hours at 25°C, separated the precipitate, and tested the concentration of residual methylene blue by ultraviolet-visible spectrophotometry. The result is Figure 4 Shown.
[0051] Such as Figure 4 As shown, as the pH value increases, the adsorption capacity of the adsorbent also increases, which is mainly related to the negative charge on the surface of the adsorbent. The higher the pH value, the more negative charges on the surface of the adsorbent, a...
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