A kind of polyvinylidene fluoride phosphorus removal film doped with lanthanum carbon composite adsorbent and its preparation method and application

A polyvinylidene fluoride and carbon composite technology, used in chemical instruments and methods, adsorbed water/sewage treatment, membranes, etc., can solve the problems of lanthanum leakage of lanthanum-carbon composite adsorbents, improve surface characteristics, and reduce dissolution loss. , to avoid the effect of agglomeration

Active Publication Date: 2022-03-08
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the present invention, the lanthanum-carbon composite adsorbent is doped into the polyvinylidene fluoride membrane, and under the premise of ensuring high-purity water flux, it can not only solve the problem of lanthanum leakage of the lanthanum-carbon composite adsorbent, but also remove phosphorus, suspended material (SS) etc.

Method used

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  • A kind of polyvinylidene fluoride phosphorus removal film doped with lanthanum carbon composite adsorbent and its preparation method and application
  • A kind of polyvinylidene fluoride phosphorus removal film doped with lanthanum carbon composite adsorbent and its preparation method and application
  • A kind of polyvinylidene fluoride phosphorus removal film doped with lanthanum carbon composite adsorbent and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0041]At 4°C, add 0.81g of 4,4'-diaminobiphenyl into 300mL of hydrochloric acid diluent containing 0.73% concentrated hydrochloric acid (containing 36-37wt% HCl) by volume to facilitate its dissolution. After 15 minutes, add 90 mL of 0.76% nitrous acid solution, and react for 20 minutes to completely transform the amino group into diazonium salt. At this time, the solution turns from dark yellow to bright yellow. Then add 90 mL of a mixed solution containing 0.87% tannic acid and 1.67% sodium carbonate in mass fraction. After magnetic stirring for 10 h, a tan solid product was obtained, which was filtered, and the obtained product was freeze-dried for 24 h. Grind the product after drying, then press the resulting product with LaCl 3 Mass ratio 1:38 dispersed in LaCl 3 ·6H 2 O solution, adjusted to pH = 10 with NaOH solution, filtered, dried overnight at 60°C, carbonized in a tube furnace at 700°C in an inert atmosphere for 1 hour, and the carbonized material is the lanthanu...

Embodiment 2

[0048] The difference from Example 1 is that 0.1875 g of the lanthanum-carbon composite adsorbent prepared in Example 1 was added to the casting solution, and the rest of the conditions were the same to obtain a polyvinylidene fluoride phosphorus removal membrane doped with the lanthanum-carbon composite adsorbent. The mass ratio of polyvinylidene fluoride to lanthanum carbon composite adsorbent is 20:1.

Embodiment 3

[0050] The difference from Example 1 is that 0.25 g of the lanthanum-carbon composite adsorbent prepared in Example 1 was added to the casting solution, and the rest of the conditions were the same to obtain a polyvinylidene fluoride phosphorus removal membrane doped with the lanthanum-carbon composite adsorbent. The mass ratio of polyvinylidene fluoride to lanthanum carbon composite adsorbent is 15:1.

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Abstract

The invention discloses a polyvinylidene fluoride phosphorus removal membrane doped with a lanthanum-carbon composite adsorbent suitable for the field of water treatment. The composition includes a lanthanum-carbon composite adsorbent with a mass percentage of X and a polyvinylidene fluoride with a mass percentage of Y , 0<X≤30%, 70%≤Y<100%. The preparation method of the polyvinylidene fluoride phosphorus removal membrane comprises the steps: (a) adding polyvinylidene fluoride and lanthanum carbon composite adsorbent into N-methylpyrrolidone and fully stirring to obtain a uniform casting solution; (b) adding the polyvinylidene fluoride The casting solution is left to stand in a vacuum to remove air bubbles, and then scraped and coated on a glass plate, then placed in the air for 25-35 seconds, then immersed in an ethanol solution, solidified to form a film, and then peeled off from the glass plate.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a polyvinylidene fluoride phosphorus removal membrane doped with a lanthanum-carbon composite adsorbent and a preparation method and application thereof. Background technique [0002] Excessive concentration of nitrogen and phosphorus nutrients in the water body will lead to eutrophication of the water body, promote the proliferation of harmful algae, and form algal blooms. The occurrence of algal blooms poses a serious threat to drinking water supplies and the conservation of aquatic ecosystems. Reducing the input of nutrients, especially phosphorus, is an important part of eutrophication management. Among them, controlling the concentration of total phosphorus in sewage is an effective method. [0003] At present, sewage biological phosphorus removal technology is sensitive to changes in organic loads, toxic substances, and reactor operating parameters, and its phospho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00B01J20/20B01J20/30B01J20/28C02F1/44C02F1/28C02F101/10
CPCB01D71/34B01D71/021B01D71/022B01D69/02B01D67/0079B01J20/0207B01J20/20B01J20/28059C02F1/44C02F1/288B01D2325/12C02F2101/105
Inventor 黄宝成夏雯静俞琳倩朱晓燕熊金瑞王薛超金仁村
Owner HANGZHOU NORMAL UNIVERSITY
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