Spherical silicon-based organic-inorganic hybrid boron adsorbent and preparation method thereof
A spherical silicon, adsorbent technology, applied in inorganic chemistry, chemical instruments and methods, adsorbed water/sewage treatment, etc., can solve the problems of uncontrollable group density, poor mechanical properties, mass transfer effects, etc., to facilitate industrial application , good mechanical properties, good stability
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Embodiment 1
[0054] (1) Preparation of precursor: Mix meglumine as a polyhydroxy functional compound with γ-(2,3-epoxypropoxy)propyltrimethoxysilane at a molar ratio of 1:1, add N,N-dimethyl Dissolve the base formamide solvent until it is completely dissolved, stir the reaction at 80°C for 4 hours, import the reacted solution into a rotary evaporator, and remove the solvent at 60°C at 200r / min for 20min, and extract the residue by Soxhlet (Using methanol as the reflux extraction solution, extracting at 70°C) After 48 hours, a precursor containing boron-selective functional groups was obtained;
[0055] (2) Preparation of sol: Take 0.5 g of the precursor prepared in step (1) and 2.0 g of tetramethoxysilane, dissolve them in 10 ml of 50% methanol aqueous solution, add hydrochloric acid to adjust the pH to 2, and store the resulting mixture at 80°C The reaction was carried out for 12 hours, and the sol was obtained after the end of the reaction;
[0056] (3) Preparation of spherical silicon-...
Embodiment 2
[0060] (1) Preparation of precursor: Meglumine is used as a polyhydroxy functional compound, mixed with γ-(2,3-glycidoxy)propyltrimethoxysilane at a molar ratio of 1:1, and N,N-di Methylformamide is dissolved in a solvent until it is completely dissolved, and the reaction is stirred at 80°C for 4 hours, and the reacted solution is introduced into a rotary evaporator, and at 60°C, 200r / min rotary evaporator for 20min to remove the solvent, and the residue is subjected to Soxhlet After 48 hours of extraction (using methanol as the reflux extraction solution at 70°C), a precursor containing boron-selective functional groups was obtained;
[0061] (2) Preparation of sol: Take 1.0 g of the precursor prepared in step (1) and 1.0 g of tetramethoxysilane, dissolve them in 10 ml of 50% methanol aqueous solution, add hydrochloric acid to adjust the pH to 2, and store the resulting mixture at 80°C Reacted for 12 hours, and the sol was obtained after the reaction;
[0062] (3) Preparatio...
Embodiment 3
[0065] (1) Preparation of precursor: Meglumine was used as a polyhydroxy functional group compound, and γ-(2,3-glycidoxy)propyltrimethoxysilane was dissolved in N,N-dimethoxysilane at a molar ratio of 1:1. In methylformamide solvent, stirred and reacted at 80°C for 4 hours, introduced the reacted solution into a rotary evaporator, and at 60°C, 200r / min rotary evaporator for 20min to remove the solvent, and the residue was extracted by Soxhlet (with methanol After 48 hours, the precursor containing boron-selective functional groups was obtained;
[0066] (2) Preparation of sol: Take 2.5 grams of the precursor prepared in step (1) and 0.5 grams of tetramethoxysilane, dissolve them in 10 ml of 50% methanol aqueous solution, add hydrochloric acid to adjust the pH to 2, and store the resulting mixture at 80°C Reacted for 12 hours, after the reaction ended, a sol was obtained;
[0067] (3) Preparation of spherical silicon-based boron adsorbent: Add the sol prepared in step (2) into...
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