Preparation method and application of nano zero-valent iron intercalated montmorillonite-supported hydrogel
A technology of intercalated montmorillonite and nano-zero valent iron, applied in chemical instruments and methods, water pollutants, adsorbed water/sewage treatment, etc., can solve the uneven diffusion of nZVI, adverse reactions, and reduce the degradation of nZVI to pollutants Speed and capacity, etc., to achieve the effect of improving the degree of order and dispersibility, increasing the reaction rate, improving the reactivity and service life
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Embodiment 1
[0037] Add 1 g of montmorillonite (cation exchange capacity of 90 cmol / kg, particle size of 1 μm) to 20 mL of 0.06 mol / L FeCl 3 ·6H 2 O solution, shake well and then centrifuge, and vacuum dry at 30°C for 10 h to obtain Fe 3+ Intercalated montmorillonite particles. Then 1g of the prepared Fe 3+ Intercalated montmorillonite was added to 50mL of 0.5mol / L HCl, under N 2 Under protection, 96mL of 0.05mol / L NaBH 4The solution was added to the acidified solution and continued to stir for 1 h to complete the reaction. Centrifuge after the reaction, then wash with absolute ethanol for 3 times, then rinse with anaerobic deionized water for several times, and finally place it in a vacuum oven and dry at 60°C for 12 hours to obtain black nanometer zero-valent iron intercalated montmorillonite earth. Dissolve 5g of NaOH and 10g of urea in a 250mL volumetric flask and record it as NaOH / urea solution. Dissolve 0.5 g of microcrystalline cellulose in 10 mL of NaOH / urea solution, freeze...
Embodiment 2
[0039] Add 1 g of montmorillonite (cation exchange capacity of 90 cmol / kg, particle size of 2 μm) to 20 mL of 0.09 mol / L FeCl 3 ·6H 2 O solution, shake well and then centrifuge, and vacuum dry at 35 °C for 11 h to obtain Fe 3+ Intercalated montmorillonite particles. Then 1g of the prepared Fe 3+ Add 60mL of 0.5mol / L HCl to the intercalation montmorillonite, under N 2 Under protection, quickly put 144mL of 0.05mol / L NaBH 4 The solution was added to the acidified solution and continued to stir for 1 h to complete the reaction. Centrifuge after the reaction, then wash with absolute ethanol for 3 times, then rinse with anaerobic deionized water for several times, and finally place it in a vacuum oven and dry at 60°C for 12 hours to obtain black nanometer zero-valent iron intercalated montmorillonite earth. Dissolve 6g of NaOH and 11g of urea in a 250mL volumetric flask and record it as NaOH / urea solution. Dissolve 0.8 g of microcrystalline cellulose in 16 mL of NaOH / urea so...
Embodiment 3
[0041] Add 1 g of montmorillonite (cation exchange capacity of 90 cmol / kg, particle size of 3 μm) to 20 mL of 0.12 mol / L FeCl 3 ·6H 2 O solution, shake well and then centrifuge, and vacuum dry at 40°C for 12h to obtain Fe 3+ Intercalated montmorillonite particles. Then 1g of the prepared Fe 3+ Intercalated montmorillonite was added to 50mL of 1mol / L HCl, under N 2 Under protection, 96mL of 0.1mol / L NaBH 4 The solution was added to the acidified solution and continued to stir for 1 h to complete the reaction. Centrifuge after the reaction, then wash with absolute ethanol for 3 times, then rinse with anaerobic deionized water for several times, and finally place it in a vacuum oven and dry at 60°C for 12 hours to obtain black nanometer zero-valent iron intercalated montmorillonite earth. Dissolve 7g of NaOH and 12g of urea in a 250mL volumetric flask and record it as NaOH / urea solution. Dissolve 0.6 g of microcrystalline cellulose in 12 mL of NaOH / urea solution, freeze at...
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