A preparation method of silane-modified attapulgite and its application in the removal of pesticide residues in Chinese herbal medicine
A technology of silane modification and Chinese herbal medicine, applied in chemical instruments and methods, other chemical processes, ion exchange, etc., can solve problems such as complex methods and difficult operation
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Embodiment 1
[0036] Put the attapulgite and water in a beaker at a ratio of 1:20, stir at room temperature for 2 days, and let it stand for 2 days. After precipitation, take the middle layer and put it in another beaker. After replenishing water to the original volume, repeat the above steps 2-3 Second-rate. Finally, take the middle layer and place it in an oven at 105°C for drying, weighing, and grinding. Mix purified attapulgite with 1 mol·L -1 Acidify with hydrochloric acid at a ratio of 1:20, stir at room temperature for 2 days, let stand for 2 days, wash the clay solid in the lower layer with distilled water several times, filter with suction, dry, grind, pass through a 150-mesh sieve, and acidify the attapulgite. Take 10g of acidified attapulgite and 100mL of toluene in a 250mL three-necked flask, add 0.7g of KH-792, 1mL of triethylamine, stir magnetically, and heat to reflux for 24 hours. After the reaction, the attapulgite is washed repeatedly with ethanol until the coupling agent...
Embodiment 2
[0039] Put the attapulgite and water in a beaker at a ratio of 1:40, stir at room temperature for 2 days, and let it stand for 2 days. After precipitation, take the middle layer and put it in another beaker. After replenishing water to the original volume, repeat the above steps 2-3 Second-rate. Finally, take the middle layer and place it in an oven at 105°C for drying, weighing, and grinding. Mix purified attapulgite with 1 mol·L -1Acidify with hydrochloric acid at a ratio of 1:25, stir at room temperature for 2 days, let stand for 2 days, wash the lower clay solid with distilled water several times, filter with suction, dry, grind, pass through a 150-mesh sieve, and acidify the attapulgite. Take 10g of acidified attapulgite and 80mL of methanol-water into a 250mL three-necked flask, add 0.5g of KH-550 and 0.8mL of triethylamine, stir magnetically, and heat to reflux for 24 hours. After the reaction, attapulgite is washed repeatedly with ethanol until even The joint agent w...
Embodiment 3
[0042] Put the attapulgite and water in a beaker at a ratio of 1:50, stir at room temperature for 2 days, and let it stand for 2 days. After precipitation, take the middle layer and put it in another beaker. After replenishing water to the original volume, repeat the above steps 2-3 Second-rate. Finally, take the middle layer and place it in an oven at 105°C for drying, weighing, and grinding. Mix purified attapulgite with 1 mol·L -1 Acidify with hydrochloric acid at a ratio of 1:30, stir at room temperature for 2 days, let stand for 2 days, wash the clay solid in the lower layer with distilled water several times, filter with suction, dry, grind, pass through a 150-mesh sieve, and acidify the attapulgite. Take 10g of acidified attapulgite and 120mL of ethanol-water into a 250mL three-necked flask, add 1g of KH-1161 and 1.2mL of triethylamine, stir magnetically, and heat to reflux for 24 hours. After the reaction, the attapulgite is washed repeatedly with ethanol until coupli...
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