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Improved charcoal-based phosphorous removal adsorbent and preparation method thereof

A Technology for Improving Biochar and Phosphorus Adsorbents

Active Publication Date: 2014-06-25
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, purely using rare earth elements as adsorbents has high cost and low efficiency, making it difficult to popularize and apply

Method used

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  • Improved charcoal-based phosphorous removal adsorbent and preparation method thereof
  • Improved charcoal-based phosphorous removal adsorbent and preparation method thereof
  • Improved charcoal-based phosphorous removal adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] An improved biochar-based phosphorus removal adsorbent, the preparation method of which comprises the following steps:

[0032] 1) Preparation of biochar raw material A0: Break natural air-dried corn stalks (or other common crop stalks) into pieces with a length of about 0.1-0.5 cm, and wash them repeatedly with deionized water until the washing leachate meets molybdenum. Ammonium acid and ascorbic acid do not appear blue; put the washed straw in an oven at 60-100°C for 6-12 hours, then use a pulverizer to crush it, and pass it through a 60-mesh sieve. The obtained material is the raw material of biochar A0 .

[0033] 2) Preparation of the mixture A1 of biochar raw material A0 and cerium compound: first add cerium chloride (CeCl3 7H2O) into distilled water to fully dissolve, then add the aforementioned A0 material, and the addition ratio (mass volume ratio) is A0 mass (g ): Volume of cerium chloride solution (mL) = 1:10 (g / mL). At the same time, by controlling the con...

Embodiment 1

[0038] In order to obtain the adsorption performance, especially the parameters of the adsorption capacity, of the adsorption material for phosphorus removal prepared in the present invention, an isothermal adsorption test was carried out in this embodiment.

[0039] The preparation method of an improved biochar-based phosphorus removal adsorbent (namely the aforementioned A2) is the same as before.

[0040] The isothermal adsorption test is as follows: Potassium dihydrogen phosphate solution is used to prepare simulated wastewater containing different concentrations of phosphate (between 20-350mg / L), and then mixed with the prepared phosphorus removal adsorbent A2 at 25°C to keep the adsorbent The dosage is 2g / L, shake overnight under the condition of 200rpm, and test the phosphate content in the supernatant after the adsorption equilibrium is reached, and the test method is the molybdenum blue colorimetric method. The phosphate concentration was equilibrated by the supernata...

Embodiment 2

[0045] This example investigates the adsorption process of phosphate radicals by an improved biochar-based phosphorus removal adsorbent produced in the present invention. The preparation method of the phosphorus removal adsorbent in this example is the same as the preparation method of A2 above. The dosage of adsorbent is 2g / L, the shaking speed is 200rpm, and the pH is kept at the original state. The phosphate test method is the molybdenum blue colorimetric method.

[0046] figure 1 The adsorption process curves of the phosphorus removal adsorbent prepared by the present invention under the conditions of different initial concentrations of phosphate are shown. It can be found that under the test conditions, the phosphorus removal adsorbent produced by the present invention can achieve adsorption equilibrium in about 60 minutes, and the adsorption speed is relatively fast, which provides favorable conditions for future applications. Table 2 shows pseudo-first-order and pseu...

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Abstract

The invention discloses an improved charcoal-based phosphorous removal adsorbent and a preparation method of the improved charcoal-based phosphorous removal adsorbent. The method comprises the following steps: loading light rare earth elements to charcoal under optimized conditions, and preparing a high-efficiency environment-friendly charcoal-based phosphorous removal adsorbent; impregnating the cleaned and dried plant powder by using a cerium chloride solution with a certain concentration, and regulating a mass ratio of the original material of charcoal to Ce element to be 5-15 percent; adding an alkaline solution to control the pH value of the system to be more than 10, stirring, washing by using ethanol, centrifuging and drying; putting the prepared material into a muffle furnace, performing temperature programming and pyrolysis under anoxic conditions through the sealing measure, and controlling the pyrolysis temperature and pyrolysis time; washing the material by using distilled water after the pyrolysis is ended and cooling is performed, centrifuging, drying, screening, and obtaining the final product. The phosphorous removal adsorbent prepared in the invention has excellent adsorptive property on phosphate radical, the adsorptive property can reach 77.52mg / g, and a charcoal-based material which is environment-friendly and excellent in adsorptive property is provided for adsorbing and purifying phosphorous-containing wastewater.

Description

technical field [0001] The invention relates to an improved biochar-based phosphorus removal adsorbent and a preparation method thereof. Background technique [0002] Nutrient elements such as nitrogen and phosphorus enter natural water bodies in large quantities, resulting in eutrophication, which has a serious impact on people's production and life and ecological security. According to statistics, among the major lakes in my country, eutrophication caused by nitrogen and phosphorus pollution accounts for as much as 56% of the statistical lakes. Studies on eutrophication of water bodies have shown that although nitrogen and phosphorus are important nutrients necessary for organisms, aquatic organisms such as algae are more sensitive to phosphorus in many cases. The famous limnologist Vollenweider believes that the concentration of total phosphorus in water exceeds 0.02mg / L is eutrophication. The United States Environmental Protection Agency (USEPA) conducted a survey of 8...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
Inventor 冯彦房杨林章薛利红刘杨戴敏何世颖
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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