An Adsorption Membrane for Simultaneous Immobilization of Multiple Antibiotics under Seawater Conditions
A technology of adsorption membrane and antibiotics, which is applied in the fields of adsorbing water/sewage treatment, water pollutants, water/sewage treatment, etc. It can solve the problems that seawater cannot be applied and the performance of adsorption membrane is reduced, and achieves high specific surface area and strong adsorption capacity. , the effect of easy preparation process
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Embodiment 1
[0022] The preparation process is as follows:
[0023] Step 1, preparing XDA-1 functionalized resin powder
[0024] (1) Dry the XDA-1 macroporous resin and grind it with a pulverizer;
[0025] (2) The resin powder after grinding is sieved twice, and the middle part is retained;
[0026] Step 2: Activate the XDA-1 resin powder sieved in Step 1 with methanol, and rinse it with ultrapure water;
[0027] Step 3, mix the resin, agarose powder, and ultrapure water after activation and washing in step 2 at a ratio of 10 (mass): 1.5 (mass): 100 (volume) to obtain a gel-making solution;
[0028] Step 4: Place the mixed solution obtained in Step 3 on a magnetic stirrer, heat and stir until it is clear and transparent, pour it into a preheated (50°C) glass mold with a thickness of 0.5mm in the inner space while it is hot, and lay it flat for about 30- Cool to room temperature after 40 min.
[0029] In step five, the cooled gel film obtained in step four is cut into discs with a diame...
Embodiment 2
[0033] The adsorption membrane prepared by the present invention was placed in 10 mL of antibiotic simulated seawater solution with different concentrations, and the concentration gradient was set to 10, 20, 50, 100, 150, 200 μg / L, and the shaking table was shaken for 24 hours. The concentration of antibiotics in the solution before and after adsorption was measured by ultra-high performance liquid chromatography tandem mass spectrometry, and used to calculate the adsorption ratio (%) of the antibiotics on the adsorption film. It can be seen from Table 1 that for most antibiotics, the adsorption ratio of the adsorption film prepared by the present invention is higher than 90%, and the adsorption effect is excellent, indicating that it is applicable to the feasibility of DGT determination of antibiotics in seawater.
[0034] Table 1 The adsorption film prepared by the present invention is to the adsorption ratio (%) of antibiotic in different concentration solutions
[0035] ...
Embodiment 3
[0038] The DGT containing the adsorption membrane prepared by the present invention is applied to the determination of antibiotics in actual seawater. Submerge DGT in seawater for 8 hours, take out the adsorption membrane, use 5mL of methanol containing 0.1% formic acid to elute the adsorption membrane twice, then blow the eluent nitrogen to nearly dry, reconstitute with the initial mobile phase, and finally use ultra-high efficiency Quantitative analysis by liquid chromatography tandem mass spectrometry. During passive sampling, active sampling was performed simultaneously as a control. The results showed that the antibiotic levels measured by passive sampling and traditional active sampling had good consistency.
[0039] Table 2 contains the DGT of the prepared adsorption film of the present invention and the antibiotic assay result of active sampling in actual seawater
[0040]
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