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Nano-lanthanum hydroxide modified lignin porous carbon as well as preparation method and application thereof

A technology of lanthanum hydroxide and porous carbon is applied in the field of water treatment, which can solve the problems of low phosphorus removal adsorption capacity, low acid and alkali resistance, limited effective active adsorption sites, etc., and achieves improved water treatment efficiency and low price. , the effect of significant adsorption effect

Active Publication Date: 2019-03-08
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved: Aiming at the defects that lanthanum hydroxide has limited effective active adsorption sites, low phosphorus removal adsorption capacity, and low acid and alkali resistance, a lignin porous carbon modified by nanometer lanthanum hydroxide and Its preparation method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Step 1. Dissolve 40.0 g of lignin acetate in 200 mL of 2.0 mol / L potassium hydroxide solution, stir evenly, and dry the solid mixture. The solid mixture is heated to 700 ° C in a nitrogen atmosphere, and after carbonization for 2 h, the natural Cool down to room temperature, wash with water until neutral, and dry in vacuum to obtain acetic acid lignin porous carbon, denoted as AALPC. Under the same conditions, the acetic acid lignin charcoal obtained without adding potassium hydroxide is denoted as AALC.

[0020] Step 2. Add 3.0 g of the lignin acetate porous carbon obtained in step 1 to a mixed solution of 200 mL of absolute ethanol and distilled water (v / v=1:5), add 5.57 g of lanthanum chloride heptahydrate, and take 1.0 mol / L of sodium hydroxide solution to adjust the pH to 10.0~11.0, react at 60°C for 2 hours, and then continue to react at room temperature for 24 hours. Make AALPC-La. Under the same conditions, acetic acid lignin is used instead of acetate lignin...

Embodiment 2

[0022] The nano-lanthanum hydroxide-modified acetate lignin porous carbon AALPC-La synthesized in Example 1 was used as an adsorbent to adsorb and treat phosphorus-containing water. The specific adsorption process is as follows: Static adsorption is carried out in a 40 mL EPA bottle with a polytetrafluoroethylene gasket. The mass ratio of the adsorbent to the phosphate-containing water can be selected from a range of 1: (800~2000). In this example The selected ratio is 1:2000, pH=6.0±0.2, the initial phosphorus concentration is 105.16 mg P / L, the water does not contain NaCl, the adsorption temperature is 25°C, and the adsorption time is 24h. After adsorption equilibrium, it was filtered through a 45 μL aqueous filter head, and the concentration of phosphorus in the filtrate was measured at 700 nm by molybdenum blue colorimetry. The measured adsorption capacity (calculated as phosphorus) was 60.30 mg P / g.

Embodiment 3

[0024] The acetic acid lignin porous carbon AALPC in Example 1 was used as an adsorbent to adsorb and treat phosphorus-containing water. The adsorption conditions are the same as in Example 2, and the final adsorption amount of phosphorus is 0.45 mg P / g. It can be seen that the loading of active component lanthanum hydroxide can effectively improve the removal effect of phosphorus in water.

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Abstract

The invention discloses nano-lanthanum hydroxide modified lignin porous carbon as well as a preparation method and application thereof. The preparation method comprises the following steps: preparingacetic acid lignin porous carbon: dissolving acetic acid lignin into a strong alkaline solution according to the ratio of 1 g to 5 mL, uniformly mixing and then drying to constant weight; carbonizinga dried solid mixture in an inert atmosphere, cooling to room temperature and then washing to neutral; carrying out vacuum drying to constant weight to obtain the acetic acid lignin porous carbon; preparing the nano-lanthanum hydroxide modified lignin porous carbon: adding the acetic acid lignin porous carbon into an ethanol aqueous solution of lanthanum chloride heptahydrate for uniformly mixing,adjusting a pH value of the solution, raising the temperature, fully reacting, sufficiently washing a reaction product and carrying out vacuum drying to constant weight to obtain the nano-lanthanum hydroxide modified lignin porous carbon. Highly-dispersed lanthanum hydroxide nanoparticles retain on the surface of the lanthanum hydroxide modified lignin porous carbon prepared by the preparation method disclosed by the invention; the absorption experiment shows that the modified acetic acid lignin porous carbon has a remarkable adsorbing effect on phosphorus, which is remarkably improved as compared with unmodified acetic acid lignin porous carbon.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for efficiently removing orthophosphate in a water body, in particular to a lignin porous carbon modified by nanometer lanthanum hydroxide and its preparation method and application. Background technique [0002] With the rapid development of the economy and the continuous improvement of the degree of industrialization, the extensive use of various phosphorus-rich detergents and chemical fertilizers and pesticides has caused the sewage containing a large amount of nutrients to flow into closed waters such as lakes, so that the phosphorus content in the water body is too high. high and cause eutrophication of water bodies. Eutrophication of the water body will cause algae and other plankton to multiply rapidly, reduce the dissolved oxygen in the water body, cause a large number of fish or other organisms to die, deteriorate the water quality, accelerate the declin...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/10
CPCB01J20/0207B01J20/20B01J20/28054B01J2220/46B01J2220/4825C02F1/281C02F2101/105
Inventor 刘晓欢宗恩敏胡伟杰宋平安
Owner ZHEJIANG FORESTRY UNIVERSITY
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