Nitric acid pretreated silica fume (2 g, SiO2) was added into 50 mL of ethanol and 50 mL of distilled water, ultrasonic dispersing 30 min, 4 mL of (3-Mercaptopropyl) triethoxysilane (MPTES) and 4 mL of ammonium hydroxide were added in dropwise.
The mixture was vigorous mechanically stirred in darkness for 12 h at 65 °C under nitrogen atmosphere.
Then, the crude product was further purified by washing with toluene (2× 50 mL) and distilled water (2×50 mL) and centrifugal separated.
APTES functionalized silica nanoparticles were synthesized according to our previous report .
Chloroacetyl chloride was synthesized based on Lee’s method.
APTES surface modified silica nanoparticles (2 g, SiO2-APTES) and 4 mL of triethylamide in 50 mL of DCM were mixed in a round flask for 2 h at 0 °C.
Then, 4 mL of chloroacetyl chloride was added in dropwise.
The mixture was vigorously mechanically stirred in darkness for 48 h at room temperature.
Chloroacetyl chloride modified SiO2-APTES was further purified by washing with toluene (2×50 mL) and acetonitrile (2×50 mL), thendispersed in acetonitrile.
Finally, 1,8- Diaminoaphalene (1 g), K2CO3(1 g) were added.
The mixture was refluxed for 12 h under nitrogen atmosphere with vigorous mechanical stirring. After reaction, the mixture was cooled down to room temperature and centrifugally separated. The 1,8- Diaminoaphalene functionalized silica nanoparticles were washed with DCM (2×50 mL) and ethanol (2×50 mL).
The chemical reaction is shown in Fig. 1.
Nitric acid pretreated silica fume (2 g, SiO2) was added into 50 mL of ethanol and 50 mL of distilled water, ultrasonic dispersing 30 min, 4 mL of (3-Mercaptopropyl) triethoxysilane (MPTES) and 4 mL of ammonium hydroxide were added in dropwise. The mixture was vigorous mechanically stirred in darkness for 12 h at 65 °C under nitrogen atmosphere. Then, the crude product was further purified by washing with toluene (2× 50 mL) and distilled water (2×50 mL) and centrifugal separated. APTES functionalized silica nanoparticles were synthesized according to our previous report . Chloroacetyl chloride was synthesized based on Lee’s method. APTES surface modified silica nanoparticles (2 g, SiO2-APTES) and 4 mL of triethylamide in 50 mL of DCM were mixed in a round flask for 2 h at 0 °C. Then, 4 mL of chloroacetyl chloride was added in dropwise. The mixture was vigorously mechanically stirred in darkness for 48 h at room temperature. Chloroacetyl chloride modified SiO2-APTES was further purified by washing with toluene (2×50 mL) and acetonitrile (2×50 mL), thendispersed in acetonitrile. Finally, 1,8- Diaminoaphalene (1 g), K2CO3(1 g) were added. The mixture was refluxed for 12 h under nitrogen atmosphere with vigorous mechanical stirring. After reaction, the mixture was cooled down to room temperature and centrifugally separated. The 1,8- Diaminoaphalene functionalized silica nanoparticles were washed with DCM (2×50 mL) and ethanol (2×50 mL). The chemical reaction is shown in Fig. 1.
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