Heavy metal adsorption material and preparation method and application thereof

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...

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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