Preparing process and application of composite biolipid/cellulose acetate membrane
A technology of cellulose acetate and cellulose acetate, which is applied in the application of pre-enrichment and removal, the preparation of biological ester/cellulose acetate composite membrane, and the regeneration of the above-mentioned composite membrane, can solve the problem of reducing enrichment efficiency, Problems such as slow enrichment rate of lipophilic organic pollutants and inability to purify
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Embodiment 1
[0017] Embodiment 1: cellulose acetate-trioleate composite film (wherein trioleate content 0.5%)
[0018] The formula of the film used in the experiment is as follows: the weight of each component is 18 g of cellulose acetate, 10 g of dioxane, 70 g of acetone, 2 g of magnesium perchlorate, and 1.5 g of neutral fat. Film-making process: L-S phase inversion method; evaporation time is 60 seconds, and the temperature of the cold dipping solution is 23-24°C. figure 1 It is the scanning electron micrograph of the front, back and cross-section of the composite membrane. Table 1 is the basic physical and chemical properties of the composite membrane prepared.
[0019] Mechanical strength (kg)
Embodiment 2
[0020] Embodiment 2: Utilize the cellulose acetate-trioleate (1.5%) composite membrane material of making to enrich the organochlorine pesticide in water
[0021] About 0.1 g of the above-mentioned composite membrane material was put into flowing water prepared in the laboratory, in which the concentration of each of the five organochlorine pesticides was 2 μg / L. During the experiment, samples were taken at intervals of 0.5, 1, 2, 4, 8, 14, and 20 days, and were dialyzed through hexane for 24 hours. The concentration of organochlorine pesticides in hexane was analyzed by GC / ECD, and converted into the concentration of pesticides in the cellulose acetate composite film. content. The chromatographic analysis conditions are: HP5890GC / ECD detector, HP-5 type 60m×0.32m×0.25um quartz capillary column, carrier gas: high-purity N 2 ;Initial temperature: 85°C, rise to 180°C at 10°C per minute, stay for 15 minutes; rise to 280°C at 20°C per minute, stay for 20 minutes. Injection port ...
Embodiment 3
[0025] Embodiment 3: Utilize the cellulose acetate-trioleate (1.5%) composite membrane material that makes to purify organochlorine slightly polluted water body
[0026] Six organochlorine pesticides in water were simulated in the laboratory, namely trifluralin, lindane, heptachlor, aldrin, dieldrin, and DDT, and the initial concentration was set to 10 μg / L. Take 50ml of simulated water and 0.1g of membrane material into a 100ml Erlenmeyer flask at the same time, shake at a low speed on a shaker. After 1, 2, 4, 8, 12, 24, 48, and 96 hours, remove the triangular flask, take out the membrane carefully, blot the moisture on the membrane with soft paper, weigh and record immediately. The membrane was dialyzed in 20 ml of hexane in the dark. After 24 hours, the membrane dialysis was complete, and 5 ml of the dialysate was concentrated to 0.2 ml for analysis.
[0027] Add recovery indicators 2,4,5,6-tetrachloro-m-xylene and PCB-209 to the simulated water in the triangular flask, e...
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