Preparation method of maleic anhydride modified walnut shell adsorbent
A technology of maleic anhydride and walnut shell, which is applied in the field of preparation of walnut shell adsorbent, can solve the problems of low nickel ion adsorption capacity and grafting rate limitation
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Embodiment 1
[0015] Weigh 3 g of walnut shell raw material, 6.0 g of maleic anhydride and 35 mL of ethyl acetate into a three-neck flask, heat to 77 °C under stirring, react for 2 h, filter while hot, and wash with deionized water until the filtrate It is neutral; it is dried to constant weight at 90 ℃ to obtain the product P1.
[0016] Weigh about 40 mg of product P1 into a stoppered Erlenmeyer flask, and add 25 mL of 5.0 mmol L -1 Then shake the Erlenmeyer flask and place it in a constant temperature water bath at 25 °C for static adsorption experiments. After 48 hours of constant temperature adsorption, filter and collect the filtrate, and measure the Pb in the filtrate 2+ residual concentration. The carboxyl content that obtains product P1 is 3.62mmol / g, to Pb 2+ The adsorption capacity is 124.26 mg·g −1 , after 4 cycles of Pb 2+ The adsorption capacity is 109.33mg·g −1 .
Embodiment 2
[0018] Weigh 3 g of walnut shell raw material, 12.0 g of maleic anhydride and 45 mL of N-methylpyrrolidone into a three-neck flask, heat to 95 °C under stirring, react for 4 h, filter while hot, and wash with deionized water Until the filtrate is neutral; dry to constant weight at 90°C to obtain product P2.
[0019] Weigh about 40 mg of product P2 into a stoppered Erlenmeyer flask, and add 25 mL of 5.0 mmol L -1 Then shake the Erlenmeyer flask and place it in a constant temperature water bath at 25 °C for static adsorption experiments. After 48 hours of constant temperature adsorption, filter and collect the filtrate, and measure the Ni in the filtrate 2+ residual concentration. The carboxyl content that obtains product P2 is 4.90mmol / g, to Ni 2+ The adsorption capacity is 78.33 mg·g −1 , after 4 cycles of Ni 2+ The adsorption capacity is 68.93mg·g −1 .
Embodiment 3
[0021] Weigh 3 g of walnut shell raw material, 3.0 g of maleic anhydride and 30 mL of acetonitrile into a three-necked flask, heat to 80 °C under stirring, react for 1 h, filter while hot, and wash with deionized water until the filtrate is neutral. properties; dried to constant weight at 90 °C to obtain the product P3.
[0022] Weigh about 40 mg of product P3 into a stoppered Erlenmeyer flask, and add 25 mL of 5.0 mmol L -1 Then shake the Erlenmeyer flask and place it in a constant temperature water bath at 25 °C for static adsorption experiments. After 48 hours of constant temperature adsorption, filter and collect the filtrate, and measure the Pb in the filtrate 2+ residual concentration. The carboxyl content that obtains product P3 is 3.15mmol / g, to Pb 2+ The adsorption capacity is 110.97 mg·g −1 , after 4 cycles of Pb 2+ The adsorption capacity is 97.73mg·g −1 .
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Abstract
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