A nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol hydrogel fluorescent probe and its preparation method and application
A technology of salicylaldehyde thiosemicarbazone and nanocellulose, which is applied in the field of polymer composite materials, can solve the problems of lack of mechanical properties, and achieve the effects of increasing mechanical properties, being easy to carry, having biocompatibility and easy degradability
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Embodiment 1
[0069] Example 1 Preparation of nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol composite hydrogel fluorescent probe
[0070] PB-TOCN-SHAT-I (TOCN concentration 0.5wt%, SHAT 0.001g)
[0071] Step 1, the cellulose is prepared into TOCN through chemical and mechanical treatment, and the specific method steps include:
[0072] (1) Chemical treatment method:
[0073] 1) Weigh 0.033g of TEMPO, add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C; after TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder;
[0074] 2) Stir vigorously until the cellulose is uniformly dispersed, then add 21.27 g of NaClO solution to the system, and continuously drop 0.5 mol L-1 NaOH solution to control the pH of the reaction system at about 10 to obtain an oxidized cellulose suspension;
[0075] 3) After reacting for 6 hours, filter the oxidized cellulose suspension, and wash...
Embodiment 2
[0087] Example 2 Preparation of nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol composite hydrogel fluorescent probe
[0088] PB-TOCN-SHAT-Ⅱ (TOCN concentration 0.5wt%, SHAT 0.005g)
[0089] Step 1, the cellulose is prepared into TOCN through chemical and mechanical treatment, and the specific method steps include:
[0090] (1) Chemical treatment method:
[0091] 1) Weigh 0.033g of TEMPO, add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C; after TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder;
[0092] 2) Stir vigorously until the cellulose is uniformly dispersed, then add 21.27 g of NaClO solution to the system, and continuously drop 0.5 mol L-1 NaOH solution to control the pH of the reaction system at about 10 to obtain an oxidized cellulose suspension;
[0093] 3) After reacting for 6 hours, filter the oxidized cellulose suspension, and wash...
Embodiment 3
[0105] Example 3 Preparation of nanocellulose-salicylaldehyde thiosemicarbazone-polyvinyl alcohol composite hydrogel fluorescent probe
[0106] PB-TOCN-SHAT-Ⅲ (TOCN concentration 0.5wt%, SHAT 0.01g)
[0107] Step 1, the cellulose is prepared into TOCN through chemical and mechanical treatment, and the specific method steps include:
[0108] (1) Chemical treatment method:
[0109] 1) Weigh 0.033g of TEMPO, add 0.33g of NaBr into 400mL of deionized water in turn, and stir the above mixture fully with a magnetic stirrer at 10°C; after TEMPO and NaBr are completely dissolved, add 2g of crushed bleached wood pulp fiber powder;
[0110] 2) Stir vigorously until the cellulose is uniformly dispersed, then add 21.27 g of NaClO solution to the system, and continuously drop 0.5 mol L-1 NaOH solution to control the pH of the reaction system at about 10 to obtain an oxidized cellulose suspension;
[0111] 3) After reacting for 6 hours, filter the oxidized cellulose suspension, and wash ...
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