2.3. Fabrication of NST-GO membranes
The reduced GO membranes were fabricated by directly filtering 5 mL GO nanosheets dispersion onto the polycarbonate substrate, followed by the hydrazine reduction. Similarly, the reduced Ni(OH)2@GO membranes were fabricated by reduction after directly filtering Ni(OH)2@GO nanosheets dispersion onto the polycarbonate substrate. Afterwards, the hydrochloric acid aqueous solution (pH 2, 10 mL) was filtered across the reduced Ni(OH)2@GO membranes to dissolve Ni(OH)2 nanosheets for forming the nanosheet-templated channels. The obtained membranes were the expected NST-GO membranes. Besides, for comparison, parts of NST-GO membranes were reduced by hydrazine to fabricate the reduced NST-GO membranes.