A graphene oxide-based composite membrane for radioactive wastewater treatment
A radioactive wastewater, graphene-based technology, used in radioactive purification, radioactive pollutants, water/sludge/sewage treatment, etc., can solve problems such as high operation and maintenance costs, high energy consumption by evaporation and concentration methods, and harsh operating environments. , to achieve the effect of stable separation performance, simple preparation process and improved retention rate
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Embodiment 1
[0029] A graphene oxide-based composite membrane is prepared on a flake-shaped porous anodized aluminum oxide support (AAO, with an average pore diameter of 20 nm) by the method of the present invention.
[0030](1) Soak the carrier in a 0.2mM γ-aminopropyltrimethoxysilane / ethanol solution at room temperature for 2 hours, then take out the porous carrier, heat-treat it at 120°C for 1 hour, and set aside.
[0031] (2) After stirring and dispersing graphene oxide in water, add 10 mM Tris-HCl buffer solution, adjust the pH value to 8.5, ultrasonically disperse for 1 hour, and finally form a uniform dispersion of graphene oxide at 0.5 mg / mL. Add dopamine hydrochloride solution (graphene oxide / dopamine=3, mass ratio) to the aforementioned dispersion liquid, stir and react at 50°C for 3 hours, and dry at 50°C after several centrifuges to obtain polydopamine / oxidized Graphene composite.
[0032] (3) Mix the above polydopamine / graphene oxide complex with water, and make a 0.1 mg / mL f...
Embodiment 2
[0037] Adopt the method of the present invention on tubular porous alumina carrier (Al 2 o 3 , with an average pore size of 1000 nm) to prepare graphene oxide-based composite membranes.
[0038] (1) Soak the carrier in a solution of γ-(2,3-glycidoxy)propyltrimethoxysilane / ethanol with a concentration of 0.2mM for 2 hours at room temperature, then take out the porous carrier, and heat it at 150°C Heat treatment under conditions for 0.5 hours, and set aside.
[0039] (2) After stirring and dispersing graphene oxide in water, add 10 mM Tris-HCl buffer solution, adjust the pH value to 8.5, ultrasonically disperse for 0.5 hours, and finally form a uniform dispersion of graphene oxide at 0.1 mg / mL. Add dopamine hydrochloride solution (graphene oxide / dopamine=5, mass ratio) to the aforementioned dispersion liquid, stir and react at 80°C for 2 hours, and dry at 40°C after several centrifuges to obtain polydopamine / dopamine Graphene composite.
[0040] (3) Mix the above polydopamin...
Embodiment 3
[0044] The graphene oxide-based composite membrane is prepared on a sheet-shaped porous polycarbonate carrier (average pore diameter: 200 nm) by using the method of the present invention. As described in Example 1, the preparation process is basically the same, only the mass ratio of graphene oxide / dopamine is adjusted to 1. Characterization methods such as XRD determined that the nanochannel size of the graphene oxide composite film was about 0.40 nm. The separation performance of the prepared composite membrane was tested, and the results showed that the permeation flux of the membrane was 5.8L / m for the wastewater solution containing radionuclide ion concentration of 0.1mg / L 2 h, where Cs + Ion rejection rate is 78.12%, Sr 2+ Ion rejection rate is 85.35%, Eu 3 + Ion rejection rate is 99.92%, Th 4+ The ion rejection rate is 99.95%.
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