Preparation method and application of multifunctional biomass-based composite hydrogel
A composite hydrogel, multi-functional technology, applied in botany equipment and methods, gel preparation, chemicals for biological control, etc., can solve the problems of difficult and complex wastewater environmental treatment, high cost, and complicated operation, etc. Achieve the effects of high practical value and application prospect, low cost and simple preparation method
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[0033] The preparation method of multifunctional biomass-based composite hydrogel comprises the following steps:
[0034] 1) Synthesis of metal-organic frameworks (MOFs) by hydrothermal method,
[0035] Take by weighing Fe series metal powder and 0.68g trimesic acid (H 3 BTC), mix according to a certain molar ratio, add 10~25ml deionized water and stir. Measure 150~200µL hydrofluoric acid (HF 48%) and 90-150µL nitric acid (HNO 3 65%) was added dropwise to the above solution, and magnetic stirring was continued for 15-30min.
[0036] 2) Transfer the above solution to a hydrothermal reaction kettle, add a certain proportion of crystallization reagent, continue to stir for 10~20min; continue to react at 100~150℃ for 12~24h; naturally cool to room temperature after the reaction, at 4000rpm Centrifuge for 5 minutes, wash with ethanol for 3 to 6 times, dry in vacuum at 100°C for 12 hours, and collect the product;
[0037] The Fe-based metal powder used is reduced Fe powder, fer...
Embodiment 1
[0046] Take by weighing 0.27g reduced Fe powder and 0.68g trimesic acid (H 3 BTC), add 10ml deionized water and stir, measure 150µL hydrofluoric acid (HF 48%) and 90µL nitric acid (HNO 3 65%) was added dropwise in the above solution, and continued magnetic stirring for 15min;
[0047] Transfer the above solution to a hydrothermal reaction kettle, add 0.35g crystallization reagent cetyltrimethylammonium bromide (CTAB), continue to stir for 15min, and continue to react at 120°C for 12h; naturally cool to room temperature after the reaction , centrifuged at 4000rpm for 5min, washed with ethanol three times, dried in vacuum at 100°C for 12h, and collected the product;
[0048] Add 0.5g MOFs into the mixed solution of 150ml ethanol and water (the volume ratio of ethanol and water is 1:2), weigh 170mg silver nitrate and add it into the mixed solution (concentration is 10mM), stir well, and then transfer to the quartz bottle, Access to N 2 Exclude the air in the bottle, and then ...
Embodiment 2
[0051] Take by weighing 1.98g ferric sulfate and, 0.86g trimesic acid (H 3 BTC), add 20ml deionized water and stir, measure 170µL hydrofluoric acid (HF 48%) and 120µL nitric acid (HNO 3 65%) was added dropwise in the above solution, and continued magnetic stirring for 20min;
[0052] Transfer the above solution to a hydrothermal reaction kettle, add 0.85g crystallization reagent cetyltrimethylammonium bromide (CTAB), continue to stir for 10min, and continue to react at 100°C for 18h; naturally cool to room temperature after the reaction , centrifuged at 4000rpm for 5min, washed with ethanol for 5 times, dried in vacuum at 100°C for 12h, and collected the product;
[0053] Add 1.2g MOFs into the mixed solution of 225ml ethanol and water (the volume ratio of ethanol and water is 1:2), weigh 0.95g silver fluoride and add it into the mixed solution (concentration is 50mM), stir well, and then transfer to a quartz bottle Among them, pass N 2 Exclude the air in the bottle, and t...
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