Metal ion imprinted amino functionalized mesoporous silicon adsorbent and preparation method thereof
A technology of metal ion imprinting and amine-based functions, which is applied in the fields of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., and can solve the problem of weak anti-interference ability of coexisting ions, poor selective adsorption capacity, etc. problems, to achieve the effects of environmental protection, good regeneration performance, and simple preparation process
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[0056] Example 1: The adsorbent adopts the sol-gel method to synthesize metal ion-imprinted amine functionalized mesoporous silica sol under alkaline conditions. During the evaporation of solvent ethanol, the sol is gradually hydrolyzed and polycondensed to form a mesoscopic structure. After solvent volatilization, crystallization, template removal, filtration, washing, drying and other steps, the metal ion imprinted amine functionalized mesoporous silica adsorbent is finally obtained.
[0057] The metal ion imprinted amine group functionalized mesoporous silica sol is a synthetic sol, and the substance type and molar ratio of the synthetic sol are amine group-containing silane coupling agent: orthosilicate: surfactant: HCl: quaternary ammonium base :H 2 O:ethanol:metal ion=(0.04-0.35):1:(0.03-0.25):(0.01-0.10):(0.04-0.30):(4.55-10.50):(27-54):(0.01-0.35) ;
[0058] At 25°C, 2.32g of bishexadecyldimethylammonium bromide was dissolved in 40g of ethanol, and stirred at 400 rpm...
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[0059] Example 2: At 40 ° C, 3.73 g of dodecyl glycoside (mass concentration 50%) was dissolved in 20 g of ethanol, and sonicated for 1.0 hour (ultrasonic power 300 W); at the same time, 1.37 g of N-β-aminoethyl- γ-Aminopropyltrimethoxysilane was dissolved in 30g of ethanol, under the condition of ultrasonic power of 500W, 0.86g of copper nitrate was added, and 3.14g of 15% tetraethylammonium hydroxide aqueous solution was added dropwise. The pH value of the 10 mol / L hydrochloric acid solution was adjusted to 12. After 1.0 hours, the above two solutions were mixed, and 4.34 g of methyl orthosilicate was added dropwise under the condition that the stirring speed was 300 rpm. After 1.5 hours, the prepared silica sol was placed in a constant temperature and humidity box until the solvent was completely volatilized (humidity 30% RH, temperature 40°C). The product was microwave crystallized at 100°C for 2 hours (microwave power 300W), extracted with a mixed solution of ethanol and ...
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[0060] Example 3: At 50°C, dissolve 2.00g of polyethylene glycol 2000 in 30g of ethanol, and ultrasonicate for 2.0 hours (ultrasonic power 400W); dissolve 1.98g of γ-diethylenetriaminopropylmethyldimethoxysilane In 40g of ethanol, under the condition that the stirring speed is 500 rev / min, add 1.38g of zinc nitrate, dropwise add 2.88g of tetramethylammonium hydroxide aqueous solution with a mass concentration of 10%, adjust with 10mol / L of hydrochloric acid solution The pH of the system was 13.5, and the mixture was stirred for 2 hours. The above two solutions were mixed, and under the condition of ultrasonic power 400W, 7.85g propyl orthosilicate was added dropwise. After 2 hours, the prepared silica sol was placed in a constant temperature and humidity box until the solvent was completely evaporated (humidity 25% RH, temperature 30°C). The product was hydrothermally crystallized at 110°C for 2 days, and then the mixture of the product and acidic ethanol was extracted by mic...
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