abstract |
A polyvinyl alcohol hydrogel has a surface layerncomprising a net-like structure formed by entanglement ofnfiber-like articles having a diameter of 0.1 to 50 µm. Thisngel has a large surface area and high capability of adheringnmicroorganisms and permeating liquid, thereby exhibitingnexcellent purifying function. Processes for producing thenabove hydrogel are also provided. |