Method for removing antibiotics by mixing zero-valent iron with pyrite
A technology of pyrite and zero-valent iron, which is applied in the field of environmental management, can solve the problems of non-degradable antibiotics, harsh reaction conditions and high processing costs, and achieves the effects of good effect, mild reaction conditions and low energy consumption
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Embodiment 1
[0045] Zero-valent iron / pyrite mixed to remove metronidazole (concentration is 100ppm, pH 5), proceed as follows:
[0046] (1) The zero-valent iron is crushed and screened, and the particle size is 300-400 mesh iron powder, and the surface particles are washed away by pure water before use. The pyrite is crushed and sieved, the particle size is 300-400 mesh, and the surface particles are washed with pure water before use.
[0047] (2) Weigh 1g of zero-valent iron, 2g of pyrite, and 3g of zero-valent iron / pyrite mixture after processing in step (1), and the mixing ratio is 1:2, and add them to 100mL of metronidazole-containing wastewater , the initial pH is 5.0.
[0048] (3) React for 360 minutes in a shaker at 25° C. with a rotating speed of 150 r / min. Sampling after reaction finishes, sample is filtered through 0.22 μm filter membrane, by high performance liquid chromatography (mobile phase is acetonitrile: water=20:80, measuring wavelength is 318nm, and flow velocity is 1ml / ...
Embodiment 2
[0051] Zero-valent iron / pyrite mixed to remove metronidazole (concentration is 100ppm, pH 7), proceed as follows:
[0052] (1) The zero-valent iron is crushed and screened, and the particle size is 300-400 mesh iron powder, and the surface particles are washed away by pure water before use. The pyrite is crushed and sieved, the particle size is 300-400 mesh, and the surface particles are washed with pure water before use.
[0053] (2) Weigh 1g of zero-valent iron, 4g of pyrite, and 5g of zero-valent iron / pyrite mixture treated in step (1), and the mixing ratio is 1:4, and add them to 100mL of metronidazole-containing wastewater , the initial pH is 7.0.
[0054] (3) React for 360 minutes in a shaker at 25° C. with a rotating speed of 150 r / min. Samples were taken after the reaction, and the samples were filtered through a 0.22 μm filter membrane, and the concentration of residual metronidazole in the samples was determined by high performance liquid chromatography.
[0055] ...
Embodiment 3
[0057] Zero-valent iron / pyrite mixed to remove metronidazole (concentration is 100ppm, pH 9), proceed as follows:
[0058] (1) The zero-valent iron is crushed and screened, and the particle size is 300-400 mesh iron powder, and the surface particles are washed away by pure water before use. The pyrite is crushed and sieved, the particle size is 300-400 mesh, and the surface particles are washed with pure water before use.
[0059] (2) Weigh 1g of zero-valent iron, 1g of pyrite, and 2g of zero-valent iron / pyrite mixture treated in step (1), and the mixing ratio is 1:1, and add them to 100mL of metronidazole-containing wastewater , the initial pH was 9.0.
[0060] (3) React for 360 minutes in a shaker at 25° C. with a rotating speed of 150 r / min. Sampling after reaction finishes, sample is filtered through 0.22 μm filter membrane, by high performance liquid chromatography (mobile phase is acetonitrile: water=20:80, measuring wavelength is 318nm, and flow velocity is 1ml / min) m...
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