Product
My research is "Surface modification of cellulose nanofibers using ozone and its application".Cellulose nanofibers (CeNF) have a certain structure without depending on the raw material wood.Moreover, since it has high strength, enormous specific surface area and other characteristics, it can be expected to be used in various fields such as adsorbent and reaction field.Cellulose has the property of adsorbing metal ions on the basis of the hydroxyl group present on the surface, but since CeNF has a high specific surface area, it is considered that extremely many metal ions can be attached.However, since CeNF tends to form moisture bonds between fibers, the amount of adsorbed metal ions decreases. For that purpose, we aim to control metal adsorption capacity by adsorption of metal ions by surface modification using ozone for CeNF. In addition, as an application thereof, attempt was made to realize conductivity.
Describe
First of all, we will explain surface treatment first.NaOH turbidity was added so that the CeNF dispersion became 0.125 wt%, and it was tested with a homogenizer for 10 minutes. Then keep the temperature at 5 ° C for 3 h, ozone with concentration 18 g / m 3 was exposed for 30 minutes at a flow rate of 5.0 L / min, ozone oxidation treatment of CeNF was carried out, and a mat was made by suction filtration. The mat was impregnated with 2-propanol for 1.0 h and then dried.
The dried mat was impregnated with 10,000 ppm copper acetate for 1 to 10 hours.Next, the mat was impregnated in 50 ml of a 20 g / L sodium β-sodium hydroxide solution for 5 minutes.Fourier transform infrared spectroscopy (FTIR), scanning electron microscope SEM), differential heat flow measurement (DTG), and X ray diffraction (XRD) were performed.
Results
We conducted surface treatment of cellulose nanofibers and applied them, and as a result we got the following conclusions.
1 Preparation of surface treated cellulose nanofiber mat
1.1 The concentration of the NaOH aqueous solution is suitably 3 wt% to 5 wt%, and when the concentration is 7 wt% to 10 wt%, it becomes a film.
1.2 Modification of cellulose nanofiber surface can be carried out by exposing cellulose nanofiber to ozone, impregnating 2-propanol after exposure to ozone.
2 Preparation of Conductive Cellulose Nanofiber Mat
2.1 Increase of impregnation time in copper acetate aqueous solution can increase adsorption amount of copper ion and precipitation amount of copper sulfide.
2.2 There was no significant difference in decomposition behavior regardless of the presence or absence of surface treatment, and the residual ratio increased as the impregnation time in the copper acetate aqueous solution increased.
2.3 Based on the XRD results, the peak of copper sulfide strongly appeared in the one surface-treated and impregnated for 10 h.
My research is "Surface modification of cellulose nanofibers using ozone and its application".Cellulose nanofibers (CeNF) have a certain structure without depending on the raw material wood.Moreover, since it has high strength, enormous specific surface area and other characteristics, it can be expected to be used in various fields such as adsorbent and reaction field.Cellulose has the property of adsorbing metal ions on the basis of the hydroxyl group present on the surface, but since CeNF has a high specific surface area, it is considered that extremely many metal ions can be attached.However, since CeNF tends to form moisture bonds between fibers, the amount of adsorbed metal ions decreases. For that purpose, we aim to control metal adsorption capacity by adsorption of metal ions by surface modification using ozone for CeNF. In addition, as an application thereof, attempt was made to realize conductivity.
Describe
First of all, we will explain surface treatment first.NaOH turbidity was added so that the CeNF dispersion became 0.125 wt%, and it was tested with a homogenizer for 10 minutes. Then keep the temperature at 5 ° C for 3 h, ozone with concentration 18 g / m 3 was exposed for 30 minutes at a flow rate of 5.0 L / min, ozone oxidation treatment of CeNF was carried out, and a mat was made by suction filtration. The mat was impregnated with 2-propanol for 1.0 h and then dried.
The dried mat was impregnated with 10,000 ppm copper acetate for 1 to 10 hours.Next, the mat was impregnated in 50 ml of a 20 g / L sodium β-sodium hydroxide solution for 5 minutes.Fourier transform infrared spectroscopy (FTIR), scanning electron microscope SEM), differential heat flow measurement (DTG), and X ray diffraction (XRD) were performed.
Results
We conducted surface treatment of cellulose nanofibers and applied them, and as a result we got the following conclusions.
1 Preparation of surface treated cellulose nanofiber mat
1.1 The concentration of the NaOH aqueous solution is suitably 3 wt% to 5 wt%, and when the concentration is 7 wt% to 10 wt%, it becomes a film.
1.2 Modification of cellulose nanofiber surface can be carried out by exposing cellulose nanofiber to ozone, impregnating 2-propanol after exposure to ozone.
2 Preparation of Conductive Cellulose Nanofiber Mat
2.1 Increase of impregnation time in copper acetate aqueous solution can increase adsorption amount of copper ion and precipitation amount of copper sulfide.
2.2 There was no significant difference in decomposition behavior regardless of the presence or absence of surface treatment, and the residual ratio increased as the impregnation time in the copper acetate aqueous solution increased.
2.3 Based on the XRD results, the peak of copper sulfide strongly appeared in the one surface-treated and impregnated for 10 h.