Method for collecting free-state Pb (II) ions in environment quantitatively in situ
A quantitative acquisition, free state technology, used in color/spectral property measurement, sampling devices, etc.
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Embodiment 1
[0024] Mix 0.01 mol of 3-aminopropyltrimethoxysilane and 0.01 mol of glyoxylic acid in ethanol solution and react at a constant temperature of 50°C to form silanes containing Schiff base functional groups; then silanes containing Schiff base functional groups are mixed with Pb( ) ions to form a chelate, and heated at 120°C for 24 h in a hydrothermal way to make it fully react; mix ethyl orthosilicate with water in a certain proportion, adjust the pH to 2 with hydrochloric acid, and form a uniform solution, mix with Pb( ) ion chelate silane solution, stirred for 20 min, added ammonia water to adjust the pH value in the range of 6-8, and formed a gel. After aging for 48 h, the product was filtered, washed with ethanol first, and then dissolved in 1 mol / L hydrochloric acid After stirring and soaking in the solution for a certain period of time, Pb was removed ( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water...
Embodiment 2
[0026] Mix 0.01 mol of 3-aminopropyltrimethoxysilane and 0.01 mol of glyoxylic acid in ethanol solution and react at a constant temperature of 50°C to form silanes containing Schiff base functional groups; then silanes containing Schiff base functional groups are mixed with Pb( ) ions to form a chelate, and heated at 120°C for 24 h in a hydrothermal way to make it fully react; mix ethyl orthosilicate with water in a certain proportion, adjust the pH to 2 with hydrochloric acid, and form a uniform solution, mix with Pb( ) ion chelate silane solution, stirred for 20 min, added ammonia water to adjust the pH value in the range of 6-8, and formed a gel. After aging for 48 h, the product was filtered, washed with ethanol first, and then dissolved in 1 mol / L hydrochloric acid After stirring and soaking in the solution for a certain period of time, Pb was removed ( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water...
Embodiment 3
[0028] Mix 0.01 mol of 3-aminopropyltrimethoxysilane and 0.01 mol of glyoxylic acid in ethanol solution and react at a constant temperature of 50°C to form silanes containing Schiff base functional groups; then silanes containing Schiff base functional groups are mixed with Pb( ) ions to form a chelate, and heated at 120°C for 24 h in a hydrothermal way to make it fully react; mix ethyl orthosilicate with water in a certain proportion, adjust the pH to 2 with hydrochloric acid, and form a uniform solution, mix with Pb( ) ion chelate silane solution, stirred for 20 min, added ammonia water to adjust the pH value in the range of 6-8, and formed a gel. After aging for 48 h, the product was filtered, washed with ethanol first, and then dissolved in 1 mol / L hydrochloric acid After stirring and soaking in the solution for a certain period of time, Pb was removed ( ) ions, filtered, with NaHCO 3 The solution was washed to pH=7, and then the solid was washed with distilled water...
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