A kind of nano-silver composite material and preparation method for drinking water disinfection
A composite material and nano-silver technology, applied in botany equipment and methods, chemicals for biological control, disinfectants, etc., can solve the problem of inability to provide nano-confined space, difficulty in effectively exerting bactericidal effect, and difficulty in forming nanoparticles and other problems, to achieve the effect of stable load, light texture, preventing excessive growth and agglomeration
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Embodiment 1
[0025] Put 1 g of dried PP cotton (with an average pore size of 5 μm and a porosity of 80%) into 250 mL of 0.03 mol / LAgNO 3 and 20% CTAB solution, mix evenly and stir for 24 hours; take out and dry at 60°C and add 250 mL of 1% NaBH 4 solution, take it out after reacting for 12 hours; wash it with deionized water until no bubbles are produced in the effluent, then dry it.
[0026] After the acidification and digestion of the obtained nano-silver composite material, the loading amount of silver was measured by inductively coupled plasma mass spectrometry (ICP-MS) to be 0.5wt%, and it was found by scanning electron microscope-X-ray energy spectrometer (SEM-EDS) that the nano-silver was in the The PP cotton is evenly distributed, and the particle size of the silver nanoparticles in the obtained composite material is 5-80 nm observed by a transmission electron microscope.
Embodiment 2
[0028] The nano-silver composite material obtained in Example 1 was transferred to a jacketed glass adsorption column (Φ32×360 mm), and the water body was polluted by simulated microorganisms (the pH of the water body was about 7, and the concentration of Escherichia coli for 10 2 CFU / mL) through the composite material bed at a flow rate of 40ml / h, the continuous treatment capacity is 1000 bed volume (BV), no E. coli (<1 CFU / mL) can be detected in the effluent, and the silver in the water can be detected by ICP-MS The content of ions is less than 10 μg / L.
Embodiment 3
[0030] Put 1 g of dried PP cotton (with an average pore size of 5 μm and a porosity of 80%) into 250 mL of 0.03 mol / LAgNO 3 and 20% CTAB solution, mix evenly and stir for 24 hours; take out and dry at 60°C and add 250 mL of 1% NaBH 4 solution, take it out after reacting for 12 hours; wash it with deionized water until no bubbles are produced in the effluent, then dry it.
[0031] After acidification and digestion of the obtained nano-silver composite material, the loading amount of silver measured by ICP-MS is 0.5wt%. It is observed by SEM-EDS that the nano-silver is uniformly distributed in the PP cotton. The particle size is 5-80 nm.
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