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Metal element improved biochar-based nitrate radical adsorbent and preparation method thereof

A technology for improving biochar and metal elements, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve problems such as poor adsorption performance

Inactive Publication Date: 2015-01-07
JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of poor anion adsorption performance of original biochar, and provide a metal element-improved biochar-based nitrate adsorbent with strong nitrate adsorption and its preparation method

Method used

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  • Metal element improved biochar-based nitrate radical adsorbent and preparation method thereof
  • Metal element improved biochar-based nitrate radical adsorbent and preparation method thereof
  • Metal element improved biochar-based nitrate radical adsorbent and preparation method thereof

Examples

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preparation example Construction

[0043] A method for preparing a metal element-improved biochar-based nitrate adsorbent, characterized in that it comprises the following steps:

[0044] 1) Preparation of straw material: crush 50-250g of straw, pass through a 40-100 mesh sieve, soak in deionized water for 24 hours, and then wash repeatedly with deionized water until the supernatant is colorless. The cleaned straw powder is placed in an oven, and dried at 80°C-120°C for 12-24h.

[0045] 2) Preparation of mixture A1 of straw material and metal salt solution

[0046] Prepare 50-250 mL of metal salt solution with a molar concentration of 0.5-2.0 mol / L, including but not limited to magnesium chloride, calcium chloride, and aluminum chloride solutions. The straw powder prepared above is mixed with the metal salt solution, soaked for 1h-4h, centrifuged to remove the supernatant, and dried in an oven at 60-80°C for 12-24h. Let the impregnated straw material obtained at this time be A1.

[0047] 3) Preparation of me...

Embodiment 1

[0049] Embodiment 1 isothermal adsorption test

[0050] In order to obtain the adsorption performance of the adsorption material prepared by the present invention on nitrate, especially the parameters of the adsorption capacity, an isothermal adsorption test was carried out in this embodiment.

[0051] The preparation method of the adsorbent (that is, the aforementioned A2) is the same as before, using wheat straw as a precursor to prepare metal element-improved biochar. In order to determine the maximum adsorption capacity of biochar on nitrate nitrogen and related parameters, the Langmuir model and Freundlich model were used in this example to fit the isothermal adsorption data.

[0052] From the parameters obtained by fitting the two equations, it can be found that the adsorption process conforms to the assumption of the Langmuir model, that is, the adsorption process is monomolecular layer adsorption; the adsorbate is adsorbed on a specific adsorption site on the surface o...

Embodiment 2

[0054] Embodiment 2 adsorption kinetics test

[0055] Under isothermal conditions, the adsorption kinetic curve of modified wheat straw to nitrate nitrogen was studied. The experimental results are shown in figure 2 . It can be seen from the figure that the adsorption process of various biochars can be roughly divided into three stages. The first stage is rapid adsorption (0-60min). The adsorbate quickly passes through the water film to reach the surface of the adsorbent, causing the adsorption amount to rise sharply. This stage should be a fast physical process; the second stage is the stage of decreasing adsorption speed (60 minutes). -120min), the adsorption amount increases slowly with time at this stage, and the adsorbate diffuses in the pores; the third stage is the adsorption equilibrium stage (120-240min), the adsorption reaches equilibrium, and the adsorption amount no longer increases with time. The saturated adsorption capacities of the three kinds of biochars wh...

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Abstract

The invention discloses a metal element improved biochar-based nitrate radical adsorbent and a preparation method thereof. Straws are used as raw materials, and metal ions are impregnated, pyrolyzed and washed under certain conditions, so a metal ion improved cbiochar is prepared. According to the metal element improved biochar-based nitrate radical adsorbent and the preparation method thereof disclosed by the invention, by using adsorption research on nitrate radical waste water and comparing the adsorption effect of the biochar before and after improvement, the improved biochar prepared by the preparation method disclosed by the invention has good adsorption effect for potassium nitrate, wherein Mg<2+> improved wheat straw biochar has optimal adsorption effect for nitrate nitrogen; compared with the unmodified biochar, the Mg<2+> improved biochar prepared under the optimizing conditions has the advantages that the adsorption performance is improved by 10 times, and the adsorption equilibrium can be realized in a shorter time. The modified biochar adsorbent is a green adsorbent with application potential and can be used for effectively removing the nitrate nitrogen in a water body; besides, the effects of fixing carbon, reducing discharge and relieving the non-point source pollution are achieved.

Description

technical field [0001] The invention relates to a metal element-improved biochar-based nitrate adsorbent and a preparation method thereof, belonging to the fields of solid waste recycling and non-point source pollution control. 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. [0003] With the gradual control of industrial point source pollution, agricultural non-point source pollution has become the main factor causing environmental pollution in my country, especially water pollution. According to the first national survey of pollution sources, among the main pollutants discharged in my country, the amount of maj...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/041B01J20/08B01J20/20C02F1/281C02F1/283C02F1/288C02F2101/163
Inventor 冯彦房何世颖梁晨薛利红杨林章陈玉东
Owner JIANGSU ACADEMY OF AGRICULTURAL SCIENCES
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