Preparation method of humic acid modified Fe2O3 nanomaterial and application thereof to removal of estradiol
A technology of humic acid and estradiol, which is applied in the field of environmental functional material preparation, can solve the problems of high cost, secondary pollution, cumbersome steps and the like, and achieve the effects of large specific surface area, high removal efficiency, and fast and simple preparation method.
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Embodiment 1
[0019] Humic acid modified nano Fe 2 o 3 The specific preparation method of the material is as follows:
[0020] (1) Weigh 40g of Fe(NO 3 ) 3 9H 2 Dissolve O in 500mL of deionized water preheated to 90°C, add 300mL of 1mol / L KOH solution preheated to 90°C, add 50mL of 1mol / L NaHCO preheated to 90°C 3 , Covered and maintained at 90°C for 48h in a water bath.
[0021] (2) Pour the supernatant, separate the precipitate, and remove excess OH - and NO 3 - ,dry.
[0022] (3) Weigh 25g of the obtained solid and place it in a beaker, add 500mL of humic acid solution and mix, its solid-to-liquid ratio is 1:20, adjust the pH value to 8.0 with 0.1mol / L NaOH solution or HCl solution, Shake at a constant temperature of 25°C for 48h, and then centrifuge at 4000r / min for 15min.
[0023] (4) Pour off the supernatant, and repeatedly centrifuge and rinse the solid with deionized water until the concentration of organic carbon in the supernatant no longer changes significantly. Freeze-...
Embodiment 2
[0026] The humic acid modified nano-Fe prepared by embodiment 1 2 o 3 The material is applied to remove 17β-estradiol, the specific method is as follows:
[0027] (1) Prepare a 17β-estradiol solution with a concentration gradient of 0.025-1 mg / L.
[0028] (2) Weigh 0.05g of humic acid modified nano-Fe 2 o 3 Put the materials into a brown glass bottle, add 10 mL of the above-mentioned 17β-estradiol solutions of different concentrations, and shake at a constant temperature at 25°C for 48 hours.
[0029] (3) After adsorption equilibrium, the suspension was taken for centrifugation, passed through a 0.22 μm glass filter membrane and added to a 1 mL sample bottle, and the concentration of the solution after the reaction was measured by LC-MS. The results are shown in Table 1:
[0030] Table 1: Adsorption amount under different initial conditions of 17β-estradiol
[0031] Initial concentration (mg / L)
[0032] As can be seen from Table 1, the humic acid modified nano-...
Embodiment 3
[0034] The humic acid modified nano-Fe prepared by embodiment 1 2 o 3 The material is applied to remove 17β-estradiol, the specific method is as follows:
[0035] (1) Weigh 0.05g of humic acid modified nano-Fe 2 o 3 Materials As for the conical flask, add 100mL of 0.1mg / L 17β-estradiol solution, shake at 25°C for 48h.
[0036] (2) Take the suspension at different time intervals from 0 to 250 min for centrifugation, then pass through a 0.22 μm glass filter membrane and add it to a 1 mL sample bottle, and use LC-MS to measure the concentration of the solution after the reaction.
[0037] The results of the adsorption capacity at different times are as follows: figure 2 shown by figure 2 It can be seen that the humic acid modified nano-Fe 2 o 3 The adsorption capacity of the material to 17β-estradiol increased with time. Between 0-120min, the adsorption capacity increased rapidly, and gradually reached saturation after 120min.
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