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Lanthanum-carbon composite adsorbent doped polyvinylidene fluoride phosphorus removal film as well as preparation method and application thereof

A polyvinylidene fluoride and carbon composite technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, membranes, etc., can solve the problems of lanthanum leakage of lanthanum-carbon composite adsorbents, improve surface properties, avoid agglomeration, The effect of improving dispersion

Active Publication Date: 2020-07-10
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Lanthanum-carbon composite adsorbent doped polyvinylidene fluoride phosphorus removal film as well as preparation method and application thereof
  • Lanthanum-carbon composite adsorbent doped polyvinylidene fluoride phosphorus removal film as well as preparation method and application thereof
  • Lanthanum-carbon composite adsorbent doped polyvinylidene fluoride phosphorus removal film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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 lanthanum-carbon composite adsorbent doped polyvinylidene fluoride phosphorus removal film, which is suitable for the field of water treatment, and comprises a lanthanum-carbon composite adsorbent with the mass percent of X and polyvinylidene fluoride with the mass percent of Y, X is more than 0 and less than or equal to 30 percent, and Y is more than or equal to 70 percent and less than 100 percent. The preparation method of the polyvinylidene fluoride phosphorus removal membrane comprises the following steps: (a) adding polyvinylidene fluoride and a lanthanum-carboncomposite adsorbent into N-methyl pyrrolidone, and fully stirring to obtain a uniform membrane casting solution; and (b) performing standing on the membrane casting solution, removing bubbles in vacuum, blade-coating a glass plate with the membrane casting solution, placing the glass plate in air for 25-35 seconds, immersing the glass plate in an ethanol solution, curing to form a membrane, and removing the membrane 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 Applications(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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