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Preparation method of magnetic nano-modified walnut shell adsorbent and application of magnetic nano-modified walnut shell adsorbent in treatment of hexavalent chromium in soil

A magnetic nanometer and walnut shell technology, which is applied in the restoration of polluted soil, chemical instruments and methods, and other chemical processes, etc., can solve the problems of easy agglomeration of nanometer zero-valent iron, small adsorption capacity of heavy metal ions, and low removal rate, etc. To achieve the effect of strong reducing ability, low price and high reactivity

Pending Publication Date: 2022-04-19
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology

The invention can not only solve the problem that nanometer zero-valent iron is easy to agglomerate, but also solve the problems of small adsorption capacity and low removal rate of walnut shells to heavy metal ions

Method used

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  • Preparation method of magnetic nano-modified walnut shell adsorbent and application of magnetic nano-modified walnut shell adsorbent in treatment of hexavalent chromium in soil
  • Preparation method of magnetic nano-modified walnut shell adsorbent and application of magnetic nano-modified walnut shell adsorbent in treatment of hexavalent chromium in soil
  • Preparation method of magnetic nano-modified walnut shell adsorbent and application of magnetic nano-modified walnut shell adsorbent in treatment of hexavalent chromium in soil

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Embodiment 1

[0023] Such as figure 1 As shown, the preparation method of the magnetic nano-modified walnut shell adsorbent with efficient repair performance of the present invention comprises the following steps:

[0024] S101: Select walnut shell powder with a particle size of 0.075-0.150mm, wash it with deionized water to remove surface impurities, dry it at 80°C, grind it through a 100-mesh sieve, and record it as WSP;

[0025] S102: Add 100 mL of deionized water into a 500 mL three-necked flask, and feed N into it under mechanical stirring at 600 rpm. 2 After 30min to remove dissolved oxygen in the solution, 1.12gWSP and 2.78gFeSO 4 ·7H 2 O was added to the above solution and stirred for 2h, then 100mL of absolute ethanol was added to the above mixed solution and stirred for 30min, and then 25mL of 1.2mol L -1 NaBH 4 Add the solution dropwise into the above mixed solution, and continue to stir for 30 minutes after the dropwise addition is completed. During the whole preparation pro...

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Abstract

The invention provides a preparation method of a magnetic nano-modified walnut shell adsorbent and application of the magnetic nano-modified walnut shell adsorbent in treatment of hexavalent chromium in soil. The preparation method comprises the following steps: 1, providing clean walnut shell powder; 2, adding the clean walnut shell powder and ferrous sulfate into deionized water without dissolved oxygen, then adding absolute ethyl alcohol, then adding a sodium borohydride solution, and finally separating out a black precipitate; and washing and drying the black precipitate to obtain the magnetic nano-modified walnut shell adsorbent. Compared with the effect of removing hexavalent chromium in soil by pure nano zero-valent iron, the magnetic nano modified walnut shell adsorbent has the advantages of high removal rate and good stability; compared with the original effect of removing hexavalent chromium in soil by walnut shells, the method has the advantages of high removal rate, large adsorption capacity and the like.

Description

technical field [0001] The invention relates to the technical field of soil remediation treatment, in particular to a preparation method of a magnetic nano-modified walnut shell adsorbent and its application for treating hexavalent chromium in soil. Background technique [0002] In recent years, with the rapid development of my country's industrialization and modernization, the construction of high-pollution industrial enterprises is in full swing. Due to the extensive management of some enterprises, the situation of soil pollution has become increasingly serious. In the chromium salt industry, every 1 ton of chromium salt produced will bring 3-5 tons of chromium slag, and the storage of chromium slag heaps has huge environmental risks. Once chromium pollutants are discharged into the soil, they enter the human body through direct contact or through the food chain, ranging from allergies to cancer. The remediation of chromium pollution in soil is mainly divided into two cat...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30B09C1/08
CPCB01J20/24B01J20/28009B09C1/08
Inventor 鲁秀国陈晶
Owner EAST CHINA JIAOTONG UNIVERSITY
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