Nano-stephanoporate silicon dioxide-poly-m-phenylenediamine compound film for removing hydrargyrum and preparation method thereof
A technology of poly-m-phenylenediamine and silicon dioxide, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of easy fabrication, good mercury adsorption performance, and low cost
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Embodiment 1
[0026]Dissolve 0.1 mol (10.9 g) of m-phenylenediamine monomer in 200 mL of distilled water, and ultrasonicate at room temperature for 10 minutes to promote its full dissolution. 0.1 mol (22.8 g) of ammonium persulfate was dissolved in 100 mL of distilled water. The ammonium persulfate solution was added to the above monomer solution, reacted at room temperature for 36 hours, filtered with suction, and cleaned in a funnel with distilled water. The product was completely dried under vacuum at 60° C. to obtain poly-m-phenylenediamine powder with a yield of 86.2%. The poly-m-phenylenediamine powder is dissolved in N,N'-dimethylacetamide solvent to obtain a poly-m-phenylenediamine solution with a concentration of 5 mg / mL-500 mg / mL, which is ready for use.
[0027] In a 250mL four-necked flask equipped with a thermometer, a condenser, a stirrer, and nitrogen gas, add 100mL of absolute ethanol, stir at room temperature, add 5g of hydrochloric acid (0.1M) and 5mL of water, stir for 1...
Embodiment 2
[0030] Same as Example 1, but weighed 1.875g of poly-m-phenylenediamine powder, and its solution concentration also changed from 12.5mg / mL to 18.75mg / mL. According to the loss rate test, the loss rate of the nanoporous silicon dioxide-polym-phenylenediamine composite film is 3.2%. Detected by static adsorption method, the nanoporous silica-polym-phenylenediamine composite film has an initial concentration of 0.1g / L, 0.5g / L, 1g / L, 5g / L, 10g / L, 20g / L for 25mL Mercury nitrate was adsorbed for 45 minutes, and the measured residual mercury ion concentrations were 0.88mg / L, 7.1mg / L, 14.6mg / L, 54.3mg / L, 91.8mg / L, 112.6mg / L, and the adsorption capacities were respectively The removal rates were 99.1%, 98.6%, 98.5%, 98.9%, 99.1% and 99.4%.
Embodiment 3
[0032] Same as Example 1, but weighed 0.625g of poly-m-phenylenediamine powder, and its solution concentration also changed from 12.5mg / mL to 6.25mg / mL. According to the loss rate test, the loss rate of the nanoporous silicon dioxide-polym-phenylenediamine composite film is 1.8%. Detected by static adsorption method, the nanoporous silica-polym-phenylenediamine composite film has an initial concentration of 0.1g / L, 0.5g / L, 1g / L, 5g / L, 10g / L, 20g / L for 25mL Mercury nitrate was adsorbed for 45 minutes, and the measured residual mercury ion concentrations were 1.9mg / L, 11.5mg / L, 24.8mg / L, 88.2mg / L, 125.3mg / L, 196.6mg / L, and the adsorption capacities were respectively The removal rates were 98.1%, 97.7%, 97.5%, 98.2%, 98.7% and 99.0%.
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