Preparation method and application of modified charcoal adsorbent based on lanthanum ferrite

A technology of biochar and lanthanum ferrite, which is applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal compounds, etc., can solve the problems of less application of lanthanum ferrite, achieve fast response time, easy recycling, magnetic stable effect

Inactive Publication Date: 2017-02-01
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that lanthanum oxides have good adsorption capacity for inorganic anions, but lanthanum ferrite is rarely used in the field of environmental governance

Method used

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  • Preparation method and application of modified charcoal adsorbent based on lanthanum ferrite
  • Preparation method and application of modified charcoal adsorbent based on lanthanum ferrite
  • Preparation method and application of modified charcoal adsorbent based on lanthanum ferrite

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Effect test

Embodiment 1

[0032] S1. Preparation of biochar: put agricultural waste into a muffle furnace, pyrolyze it at 400°C for 6 hours, then cool it and pass it through a 10-mesh sieve to obtain biochar;

[0033] S2. Modification treatment: after constant volume of lanthanum nitrate hexahydrate, the molar concentration is 1mol / L, after constant volume of ferric nitrate nonahydrate, the molar concentration is 1mol / L, and the lanthanum nitrate solution and ferric nitrate solution are mixed in a three-necked flask for the first stirring , to obtain a mixed solution, wherein the molar concentration ratio of lanthanum nitrate solution and ferric nitrate solution is 1: 0.1, the stirring speed for the first time is 50 rpm, and the stirring time for the first time is 1 min; then add biochar to the mixed solution, wherein the biological The ratio of charcoal to the mixed solution is 1g:5mL, and the second stirring is carried out, the stirring speed of the second stirring is 50 rpm, and the stirring time is ...

Embodiment 2

[0036] S1. Preparation of biochar: put agricultural waste into a muffle furnace, pyrolyze it at 600°C for 7 hours, then cool it and pass it through a 50-mesh sieve to obtain biochar;

[0037] S2. Modification treatment: after constant volume of lanthanum nitrate hexahydrate, the molar concentration is 1mol / L, after constant volume of ferric nitrate nonahydrate, the molar concentration is 1mol / L, and the lanthanum nitrate solution and ferric nitrate solution are mixed in a three-necked flask for the first stirring , to obtain a mixed solution, wherein the molar concentration ratio of lanthanum nitrate solution and iron nitrate solution is 1: 1, the stirring speed for the first time is 150rpm, and the stirring time for the first time is 15min; The ratio with the mixed solution is 1g:25mL, stir for the second time, the stirring speed of the second stirring is 200rpm, and the stirring time is 30min; the ammoniacal liquor added is stirred for the third time to allow it to fully reac...

Embodiment 3

[0040] S1. Preparation of biochar: put agricultural waste into a muffle furnace, pyrolyze it at 700°C for 8 hours, then cool it and pass it through a 100-mesh sieve to obtain biochar;

[0041] S2. Modification treatment: after constant volume of lanthanum nitrate hexahydrate, the molar concentration is 1mol / L, after constant volume of ferric nitrate nonahydrate, the molar concentration is 1mol / L, and the lanthanum nitrate solution and ferric nitrate solution are mixed in a three-necked flask for the first stirring , to obtain a mixed solution, wherein the molar concentration ratio of lanthanum nitrate solution and ferric nitrate solution is 1: 10, the first stirring speed is 200rpm, and the first stirring time is 1h; then add biochar to the mixed solution, wherein biochar The ratio with the mixed solution is 1g: 30mL, stir for the second time, the stirring speed of the second stirring is 300rpm, and the stirring time is 1h; the ammoniacal liquor added is stirred for the third t...

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Abstract

The invention discloses a preparation method and application of a modified charcoal adsorbent based on lanthanum ferrite. The preparation method comprises the following steps: S1, preparing charcoal; S2, performing modification treatment; and S3, performing finished product treatment. According to the method, low-cost and sufficient-source crop straws are adopted as a raw material; by virtue of a chemical coprecipitation method, the surface of the charcoal obtained by pyrolysis of the straws is modified with the lanthanum ferrite, so that the modified charcoal adsorbent has a favorable removal effect on pollution by phosphate anions in a water body, especially low-concentration phosphorus; furthermore, the adsorbent is favorable and stable in magnetism and convenient to recycle; in addition, the preparation method is simple to operate and high in preparation yield, and has potential application prospect in the field of inorganic wastewater treatment.

Description

technical field [0001] The invention relates to a preparation method and application of a modified biochar adsorbent based on lanthanum ferrite, and belongs to the technical field of wastewater treatment. Background technique [0002] Eutrophication of water bodies has become a major environmental problem today. When phosphorus in water body is the key factor that causes water body eutrophication, controlling the concentration of phosphorus is an important means to control water body eutrophication. Phosphorus removal by adsorption is to use the adsorption affinity of certain solid substances to phosphate ions in water to achieve the process of phosphorus removal. Phosphorus removal by adsorption has gradually attracted attention due to its advantages of high efficiency, low consumption, stable and fast operation. [0003] Biochar is the product of thermal cracking of biomass under anoxic conditions. It is mostly a black fluffy solid with fine particles and light texture. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/58
CPCB01J20/20B01J20/0229B01J20/28009C02F1/288
Inventor 杨梖薛利红杨林章何世颖俞映倞段婧婧薛利祥
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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