Modified graphene oxide composite material as well as preparation method and application thereof
A technology of composite materials and nano-composite materials, applied in antibacterial modified graphene oxide composite materials, modified graphene oxide composite materials and their preparation, and preparation fields, can solve the problems of limited adsorption capacity and antibacterial effect, and achieve Significant antibacterial activity, improved adsorption capacity, and the effect of avoiding secondary pollution
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Embodiment 1
[0043] A preparation method of modified graphene oxide composite material, comprising the following steps:
[0044] 1) 9.4g FeCl 3 ·6H 2 O and 3.5 g FeCl 2 4H 2 O was ultrasonically dissolved in 140 mL of distilled water, and under nitrogen protection, 20 mL of NH 4 · OH (25%, v / v), the solution was mechanically stirred at 80° C. for 30 min. After the reaction was complete, the mixture was cooled to room temperature, and the magnetic material was separated from the solution with a magnet. The obtained solid was washed three times with distilled water, and dried at 60° C. to obtain iron ferric oxide nanoparticles.
[0045] 2) Take by weighing 0.8g chitosan and be dissolved in 40mL 2% acetic acid aqueous solution, 0.4g step 1) the iron ferric oxide nano-particle that obtains and 0.2g graphene oxide are dispersed in wherein, add 3mL glutaraldehyde under stirring, and Adjust the pH to 9, react at 80 °C for 5 h, separate the product by an external magnetic field, and wash wit...
Embodiment 2
[0054] Weigh multiple portions of 0.01g of the above dithiocarbamate-functionalized magnetic chitosan graphene oxide nanocomposites, and then add them to 50mL containing 150μg·mL -1 Cu 2+ solution and 50mL containing 150μg·mL -1 Pb 2+ In the solution, adjust the pH of the heavy metal solution to 2, 3, 4, 5, 6 respectively, shake at 150rpm at room temperature for 80min, take the adsorbed solution and pass it through a 0.45μm filter membrane, and use an atomic absorption spectrometer to measure the concentration of heavy metal ions. During the adsorption process of heavy metal ions, the adsorption amount of the two ions varies with pH as follows: Figure 5 As shown in (a), it can be seen that Cu 2+ , Pb 2+ The adsorption reached its maximum at pH 6, and the calculated dithiocarbamate-functionalized magnetic chitosan graphene oxide to 150 μg mL -1 Cu 2+ The adsorption capacity is about 272.6mg·g -1 , for 150μg·mL -1 Pb 2+ The adsorption capacity is about 321.5mg·g -1 .
Embodiment 3
[0056] Weigh multiple portions of 0.01g of the above dithiocarbamate-functionalized magnetic chitosan graphene oxide nanocomposites, and then add them to 50mL containing 150μg·mL -1 Methylene blue solution and 50mL containing 150μg·mL -1 In the crystal violet solution, adjust the pH of the dye solution to 3, 4, 5, 6, 7, 8 respectively, shake at 150rpm for 120min at room temperature, take the adsorbed solution and pass it through a 0.45μm filter membrane, and use a UV-visible spectrophotometer for dyeing. concentration determination. During the dye adsorption process, the adsorption amount of the two dyes varies with pH as Figure 5 As shown in (b), it can be seen that the adsorption of methylene blue and crystal violet reaches the maximum when the pH is 8, and the calculated effect of dithiocarbamate-functionalized magnetic chitosan graphene oxide on 150 μg·mL -1 The adsorption amount of methylene blue is about 356.3 mg·g -1 , for 150μg·mL -1 The adsorption capacity of cry...
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