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Method for preparing lanthanum-loaded charcoal used for purifying phosphorus polluted water

A biochar and phosphorus pollution technology, applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., to achieve the effects of strong phosphorus removal, reduced environmental risks, and low preparation costs

Inactive Publication Date: 2014-05-14
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem to be solved: In order to make full use of the advantages of lanthanum oxide and biochar and overcome their shortcomings, the present invention loads lanthanum on biochar to form lanthanum-loaded biochar. The preparation method of lanthanum-loaded biochar for purifying phosphorus-polluted water bodies is feasible, low in cost, fully utilizes straw waste, and can be reused

Method used

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  • Method for preparing lanthanum-loaded charcoal used for purifying phosphorus polluted water
  • Method for preparing lanthanum-loaded charcoal used for purifying phosphorus polluted water
  • Method for preparing lanthanum-loaded charcoal used for purifying phosphorus polluted water

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preparation example Construction

[0024] In the preparation method (process) of the biochar loaded with lanthanum according to the present invention, the ratio of lanthanum element to corn stalk, i.e. w(La) / w (straw), residence time and pyrolysis temperature are all within their respective variation ranges. It may have an important impact on the phosphate removal rate of the final biochar, so the response surface method is used to optimize the preparation process in order to obtain the preparation parameters that can remove phosphate to the greatest extent and reduce the production cost to a certain extent.

[0025] Embodiments 1, 2, and 3 carry out single-factor experiments in the scope involved in the preparation method respectively, so as to determine the variables involved in the response surface method and their scope, so as to improve the fitting degree of the model, and make the optimization result have a higher Credibility and representativeness.

Embodiment 1

[0027]A preparation method of lanthanum-loaded biochar for purifying phosphorus-contaminated water bodies. One of the factors that mainly affects the phosphorus removal effect during the production process is the addition ratio of lanthanum. Phosphate removal effect of the prepared lanthanum-loaded biochar. Its specific implementation is as follows:

[0028] 1) Preparation of biochar raw material A 0 : the same technical scheme as mentioned above;

[0029] 2) Preparation of biochar raw material and lanthanum mixture A 1 : first lanthanum chloride (LaCl 3 ·7H 2 O) add to distilled water, then add A 0 , and its addition ratio is: A 0 The mass volume ratio with distilled water is 1:10 (g / mL), and the mass ratio with lanthanum is 5%, 10%, 15%; while stirring the above mixed solution, add 6M NaOH dropwise until the solution is pH ≥ 10, Continue to stir for 1 hour, then centrifuge at 5000rpm for 5 minutes, pour off the supernatant, wash the remaining solid with ethanol for 3 ...

Embodiment 2

[0033] A preparation method of lanthanum-loaded biochar for purifying phosphorus-contaminated water bodies. One of the factors that mainly affect the adsorption effect during the production process is the roasting temperature of biochar. This example measures the biochar prepared under different roasting temperature conditions. Phosphate removal effect of lanthanum-loaded biochar. Its specific implementation is as follows:

[0034] 1) Preparation of biochar raw material A 0 : the same technical scheme as mentioned above;

[0035] 2) Preparation of biochar raw material and lanthanum mixture A 1 : the same technical scheme as mentioned above;

[0036] 3) Preparation of lanthanum-supported biochar A 2 : put A 1 Crush it and place it in a crucible, then put it into a muffle furnace for 300°C, 400°C, 500°C, 600°C and roast for 60 minutes, cool to room temperature, take it out, and wash the material that has passed through a 60-mesh sieve by centrifugation with distilled water ...

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Abstract

The invention discloses a method for preparing lanthanum-loaded charcoal used for purifying phosphorus polluted water. The method comprises the following steps: adding maize straws which pass through a 60-100-mesh sieve into a lanthanum solution, regulating the pH of the solution to be not less than 10 by using 4-6M of NaOH or ammonium hydroxide, centrifuging, removing supernatant, and cleaning by using 95% ethanol; drying and mashing cleaned solids, and performing pyrolysis in a muffle furnace; cooling a pyrolysis product to room temperature, grinding the materials which pass through the 60-100-mesh sieve, repeatedly cleaning the materials to be pH of below 8 by using distilled water, and drying to obtain products, wherein the product which passes through the 60-100-mesh sieve is the lanthanum-loaded charcoal. The prepared lanthanum-loaded charcoal has the high phosphorus removal efficiency, the preparation process is simple and feasible, the preparation cost is low, straw wastes are fully utilized, the environmental pollution caused by straw incineration is reduced, the lanthanum-loaded charcoal is reutilized for returning to field, and the carbon pool and the phosphorus pool of soil are increased.

Description

technical field [0001] The invention belongs to the technical field of purification of nutrient-rich water bodies, and in particular relates to a cheap, efficient and reusable method for preparing lanthanum-loaded biochar for purifying phosphorus-polluted water bodies. Background technique [0002] Water eutrophication is a common environmental protection problem in all countries in the world, and our country is no exception. With the rapid development of our country's social economy, water eutrophication presents a general and increasingly serious development trend. The so-called eutrophication of water body refers to the phenomenon of water quality pollution caused by the excessive content of plant nutrients such as nitrogen and phosphorus. Among the nitrogen and phosphorus factors that cause water eutrophication, phosphorus is regarded as the limiting factor. Therefore, how to remove phosphorus in eutrophic water has always been the focus of attention and research hotspo...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
Inventor 王建国戴敏巢军委
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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