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Heavy metal adsorption material and preparation method and application thereof

A technology for adsorbing materials and heavy metals, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve the problems of heavy metals with large specific surface area, difficult to put into mass production, and large heavy metal content, etc., to achieve preparation The method is simple, convenient for large-scale mass production, and has no secondary pollution effect

Inactive Publication Date: 2019-08-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there is a very serious problem in my country's agricultural planting soil, which is the heavy metal content in the soil, especially in chemical plants and mining areas, such as heavy metals such as hexavalent chromium and lead ions, and the straw has a rough surface, porous interior, and a large specific surface area. It is beneficial to the physical adsorption of heavy metals. In the prior art, the cellulose and hemicellulose contained in the straw are often modified to make it contain multiple functional groups such as hydroxyl and carboxyl to absorb heavy metal ions in the soil; Specifically, the whole straw is crushed, and organic matter is added to modify the cellulose and hemicellulose in the straw to be acidic or alkaline to treat the soil, but the processing method is complicated and difficult to produce in batches; at the same time, it is used for modification The organic matter in the straw may also cause pollution when processing straw; at the same time, the processing process requires heating, which will consume a lot of energy and is not easy to put into mass production

Method used

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preparation example Construction

[0026] A kind of preparation method of heavy metal adsorption material of the present invention comprises the following steps:

[0027] A preparation method for a heavy metal adsorption material, characterized in that it comprises the following steps:

[0028] Step 1, peeling the straw to obtain the inner core of the straw; cutting the inner core of the straw to a small section of the inner core with a length of 2-3 cm; the straw is one of corn straw, wheat straw or sorghum straw;

[0029] Step 2, take reclaimed water, and adjust the pH to 5-7; preferably, reclaimed water is reclaimed water from domestic sewage sources,

[0030] Step 3. Soak the small section of the inner core in medium water, the soaking temperature is 25-30°C, and the soaking period is 35-40 days; when the TOC value of the soaking solution is greater than 40, filter to obtain straw humus and straw residue, straw The humic fluid is the heavy metal adsorption material.

Embodiment 1

[0032] A preparation method for a heavy metal adsorption material, characterized in that it comprises the following steps:

[0033] Step 1, peeling off the outer layer of the corn stalk to obtain the inner core of the corn stalk, and cutting the inner core of the corn stalk into 3 cm inner core segments;

[0034] Step 2, taking the water in the domestic sewage source, and adjusting the pH of the water in the domestic sewage source to 5;

[0035] Step 3. Soak the small section of the inner core in medium water. When the TOC value in the soaking solution is greater than 60, filter to obtain the straw humus solution and straw residue. The straw humus solution is the heavy metal adsorption material; the soaking temperature is 25°C Under conditions, the immersion period is 40 days.

Embodiment 2

[0037] A preparation method for a heavy metal adsorption material, characterized in that it comprises the following steps:

[0038] Step 1, peeling off the outer layer of the wheat straw to obtain the inner core of the wheat straw, and cutting the inner core of the wheat straw into small pieces of the inner core of 2.5 cm;

[0039] Step 2, taking reclaimed water from the domestic sewage source, and adjusting the pH of the reclaimed water to 6;

[0040] Step 3. Soak the small section of the inner core in reclaimed water. When the measured TOC value in the reclaimed water is greater than 50, filter to obtain the straw humus solution and straw residue. The straw humus solution is the heavy metal adsorption material; the soaking temperature is 27°C Under conditions, the immersion period is 38 days.

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Abstract

The invention discloses a heavy metal adsorption material and a preparation method and application thereof. The preparation method comprises the following steps: firstly taking a straw inner core, andshearing the straw inner core into small inner core sections; taking recycled water, and regulating a pH value in the recycled water to 5-7; and then soaking the small inner core sections into water,and filtering to obtain straw humus solution when a TOC value of the soak solution is greater than 40mg / L, namely the heavy metal adsorption material. Through the preparation method disclosed by theinvention, the straw inner core is soaked by adopting the recycled water so as to obtain the heavy metal adsorption material; the preparation process is free from heating and consuming energy; the production process is free from adding any organic matter and producing chemical pollution; the preparation method is simple, easy to operate, and convenient for batch production in large scale; the recycled water and the straw are used as the raw material, the raw material is low in cost and easy to obtain, safe and environmentally friendly, and free from secondary pollution; the cyclic utilizationof the recycled water is realized; and the heavy material adsorption material is used for treating heavy metal ions in soil, and the operation method is simple and strong in practicability.

Description

technical field [0001] The invention belongs to the technical field of heavy metal pollution control, in particular to a heavy metal adsorption material and its preparation method and application. Background technique [0002] At present, there is a very serious problem in my country's agricultural planting soil, which is the heavy metal content in the soil, especially in chemical plants and mining areas, such as heavy metals such as hexavalent chromium and lead ions, and the straw has a rough surface, porous interior, and a large specific surface area. It is beneficial to the physical adsorption of heavy metals. In the prior art, the cellulose and hemicellulose contained in the straw are often modified to make it contain multiple functional groups such as hydroxyl and carboxyl to absorb heavy metal ions in the soil; Specifically, the whole straw is crushed, and organic matter is added to modify the cellulose and hemicellulose in the straw to be acidic or alkaline to treat the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B09C1/02C02F101/20
CPCB01J20/20B09C1/02B01J2220/4825C02F2101/20
Inventor 范春辉王宇飞苏哲杨晨蔺龙健
Owner SHAANXI UNIV OF SCI & TECH
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