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Iron-manganese-magnesium-loading layered hydroxide composite semicoke and preparation method thereof

A hydroxide and semi-coke technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as large head loss, small particles, affecting the effect of phosphorus removal from wastewater, and achieve low cost. , The effect of overcoming difficult recovery and high-efficiency adsorption and removal characteristics

Pending Publication Date: 2020-08-14
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, metal layered hydroxides can absorb phosphorus in wastewater. However, due to the shortcomings of small metal layered hydroxide particles, large pressure head loss, and difficulty in recycling, there are still many shortcomings in the actual operation process. Directly Affected the effect of deep phosphorus removal in wastewater

Method used

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  • Iron-manganese-magnesium-loading layered hydroxide composite semicoke and preparation method thereof
  • Iron-manganese-magnesium-loading layered hydroxide composite semicoke and preparation method thereof
  • Iron-manganese-magnesium-loading layered hydroxide composite semicoke and preparation method thereof

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Embodiment 1

[0023] see Figure 1-3 , a layered hydroxide composite semi-coke loaded with iron, manganese and magnesium, including biomass pyrolysis semi-coke with internal pores and electron binding characteristics, and the inner and outer surfaces of biomass pyrolysis semi-coke are immobilized with layered structure Layered hydroxides of iron, manganese and magnesium.

[0024] In this example, the pore diameter of the biomass pyrolysis semi-coke is 10-500nm, and the biomass pyrolysis semi-coke with good pore distribution and huge specific surface area is used as a carrier, and the Fe 3+ , Mn 2+ , Mg 2+ The ions are introduced into the inner and outer surfaces of the biomass pyrolysis semi-coke through ion diffusion; then through the co-precipitation reaction, the Fe 3+ , Mn 2+ , Mg 2+ Ions precipitate on the inner and outer surfaces of biomass pyrolysis semi-coke to form layered hydroxides of iron, manganese and magnesium with a lamellar structure, and the size of the layered hydrox...

Embodiment 2

[0027] A method for preparing iron-manganese-magnesium layered hydroxide composite semi-coke, comprising the following steps:

[0028] S1. Add 2-10 g of biomass pyrolysis semi-coke into 50-150 ml of water, and add 5-15 ml of ethanol into it at the same time, stir for 20-40 min, and filter and wash to obtain sample 1;

[0029] S2. Configure 150-200ml containing FeCl 3 , MnCl 2 , MgCl 2 The mixed solution, FeCl in the mixed solution 3 , MnCl 2 , MgCl 2 The concentration of the total substance is 2mol / L, and 15-25ml of hydrochloric acid with a mass fraction of 37% is added to the mixed solution, 2-10g of sample 1 is added to the mixed solution, stirred for 2-6h, and mixed sample 2 is obtained The addition of hydrochloric acid can keep the mixed solution in an acidic state during the stirring process, preventing the occurrence of hydroxide precipitation in the mixed solution, which is beneficial to Fe 3+ , Mn 2+ , Mg 2+ The ions are evenly dispersed in the mixed solution. ...

Embodiment 3

[0032] A method for preparing iron-manganese-magnesium layered hydroxide composite semi-coke, comprising the following steps:

[0033] S1. Take 5 g of biomass pyrolysis semi-coke with good pore distribution and stable skeleton into a three-necked flask, add 10 ml of ethanol and 100 ml of water, stir for 30 min, and repeat suction filtration and washing 3 times to obtain sample 1.

[0034] S2, transfer gained sample 1 in the three-neck flask, add the concentrated hydrochloric acid of 10ml 37%, 190ml FeCl 3 / MnCl 2 / MgCl 2 mixed solution, where FeCl 3 : MnCl 2 : MgCl 2 The ratio of the amount of the substance is 1:1:2, stirred for 4h, and mixed sample 2 was obtained;

[0035]S3. Under the protection of nitrogen atmosphere, under the condition of continuous stirring, add 2mol / L NaOH dropwise to the prepared mixed sample 2, adjust the pH value to 10, continue stirring for 2h after the dropwise addition, suction filtration, washing, and then Freeze-drying at -40°C and 40Pa fo...

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Abstract

The invention relates to the technical field of wastewater treatment and discloses iron-manganese-magnesium-loading layered hydroxide composite semicoke and a preparation method thereof. The preparation method comprises the following steps: by taking biomass pyrolytic semicoke with good pore channel distribution and a huge specific surface area as a carrier, introducing Fe<3+>, Mn<2+> and Mg<2+> ions into the inner and outer surfaces of the biomass pyrolytic semicoke through an ion diffusion effect, then precipitating Fe<3+>, Mn<2+> and Mg<2+> ions on the inner and outer surfaces of the biomass pyrolysis semi-coke through a coprecipitation reaction to generate layered hydroxide, and finally washing and freeze-drying to obtain the iron-manganese-magnesium-loading layered hydroxide compositesemi-coke. According to the method, the Donan pre-enrichment effect of the biomass pyrolysis semicoke on inorganic anion pollutants in the water and the efficient removal of phosphorus in the wastewater by the iron-manganese-magnesium layered hydroxide are combined into a whole, the defects that the iron-manganese-magnesium layered hydroxide is difficult to recycle, small in particle, large in pressure head loss and the like are overcome, the rapid and efficient adsorption removal characteristic on phosphorus in the wastewater is achieved, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to an iron-manganese-magnesium layered hydroxide composite semi-coke and a preparation method thereof. Background technique [0002] Semi-coke is the pyrolysis product of coal at a lower temperature (600-700°C). Its specific surface area is smaller than that of activated carbon, but because it has not been pyrolyzed completely, it contains more hydrogen and oxygen inside and has richer pores. And surface structure, so chemical modification is relatively easy, and the price is relatively low; semi-coke will become a new type of adsorbent with great market appeal. [0003] Layered hydroxides, commonly known as hydrotalcites, have the characteristics of adjustable chemical composition and corresponding physical and chemical properties. In recent years, layered hydroxides have become a research hotspot, thanks to their wide application in catalysis, ion exchange materials,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/10
CPCB01J20/20B01J20/041B01J20/06C02F1/281C02F1/283C02F2101/10C02F2101/105
Inventor 周宏光杨来淑闫金龙杨延梅谭友淋
Owner CHONGQING JIAOTONG UNIVERSITY
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