Preparation method and application of biomass cellulose-based detection material
A cellulose-based, material-detecting technology, which is applied in the direction of chemical reaction of materials for analysis, analysis of materials, chemical instruments and methods, etc. problem, to achieve the effect of excellent selective recognition, fast detection speed, and lower detection limit
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Embodiment 1
[0028] Example 1: Biomass Cellulose-Based Cu 2+ Preparation of test materials
[0029] (1) First put the TEMPO-containing oxidation system (TEMPO / NaBr / NaClO oxidation system) and cellulose in 200mL aqueous solution according to the mass ratio of TEMPO:NaBr:NaClO:cellulose is 1:1:10:20, and the oxidation reaction 0.5h, the reaction temperature is 30°C, and the carboxylated nanocellulose is obtained after high-pressure homogenization.
[0030] (2) Ultrasonic dispersion of carboxylated nanocellulose, and then placed in aqueous solution with polyethyleneimine at 120 ° C for reflux reaction for 5 hours, centrifuged and washed to obtain modified nanocellulose; the carboxylated nanofibers The mass ratio of element, polyethyleneimine and water is 1:2:300.
[0031] (3) Put the modified nanocellulose obtained in step S2 with lysine and water in a mass ratio of 1:4:50 in a flask for reflux reaction at 120°C for 5 hours, and freeze-dry to obtain biomass cellulose Cu-based 2+ Test mate...
Embodiment 2
[0032] Example 2: Biomass Cellulose-Based Cu 2+ Preparation of test materials
[0033] (1) First place the TEMPO-containing oxidation system (TEMPO / NaBr / NaClO oxidation system) and cellulose in a 200mL aqueous solution according to the ratio of TEMPO:NaBr:NaClO:cellulose mass ratio of 1:1:10:20, The oxidation reaction was carried out for 16 hours, the reaction temperature was 60° C., and the carboxylated nanocellulose was obtained after high-pressure homogenization.
[0034] (2) Ultrasonic dispersion of carboxylated nanocellulose, and then placed in aqueous solution with polyethyleneimine at 120 ° C for reflux reaction for 5 hours, centrifuged and washed to obtain modified nanocellulose; the carboxylated nanofibers The mass ratio of element, polyethyleneimine and water is 1:2:300.
[0035](3) Put the modified nanocellulose obtained in step S2 with aspartic acid and water in a mass ratio of 1:4:50 in a flask for reflux reaction at 120°C for 5 hours, and freeze-dry to obtain t...
Embodiment 3
[0036] Example 3: Biomass Cellulose-Based Ag + Preparation of test materials
[0037] (1) First place the TEMPO-containing oxidation system (TEMPO / NaBr / NaClO oxidation system) and cellulose in a 200mL aqueous solution according to the ratio of TEMPO:NaBr:NaClO:cellulose mass ratio of 1:1:10:20, The oxidation reaction was carried out for 24 hours, the reaction temperature was 80° C., and the carboxylated nanocellulose was obtained after high-pressure homogenization.
[0038] (2) Ultrasonic dispersion of carboxylated nanocellulose, and then placed in aqueous solution with polyethyleneimine at 120 ° C for reflux reaction for 5 hours, centrifuged and washed to obtain modified nanocellulose; the carboxylated nanofibers The mass ratio of element, polyethyleneimine and water is 1:2:300.
[0039] (3) Put the modified nanocellulose obtained in step S2 with cysteine and water in a mass ratio of 1:4:50 in a flask for reflux reaction at 120°C for 5 hours, and freeze-dry to obtain biom...
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