Preparation method of modified walnut shell charcoal

Abstract

The invention provides a preparation method of modified walnut shell charcoal. According to the method, walnut shells, strong acid and strong alkali are used as raw materials; the steps of walnut shell pretreatment, oxygen isolation carbonization, acid modification, alkali modification, washing drying and the like are performed. The raw material sources are walnut shells; the raw materials are simple and can be easily obtained; the waste materials are changed into valuable materials; the problem of waste treatment of the walnut shells can be solved; the invention also provides an active carbonmaterial with high adsorption quantity on Cu<2+> and Cr<3+> in wastewater; the removal rate on single Cu<2+> solution in the wastewater can reach 98.1 percent; the removal rate on composite Cu<2+> solution can reach 98.1 percent; the removal rate on single Cr<3+> in the wastewater is 94.1 percent; the removal rate on composite Cr<3+> solution is 89.1 percent; the adsorption performance is good; the material stability is high; after the placement for one year under the normal temperature conditions, the adsorption performance on Cu<2+> and Cr<3+> is unchanged; the preparation method is simple;the implementation is easy; the method is worthy of being popularized and applied in the market.

Description

technical field [0001] The invention relates to the fields of resource utilization of organic agricultural and forestry waste and environmental pollution control, in particular to a preparation method of modified walnut shell biochar. Background technique [0002] The massive discharge of agricultural sewage irrigation, industrial wastewater, and domestic sewage has resulted in the fact that heavy metal elements seldom exist in a single form in the actual environment, and most of them are coexistence of two or more elements, that is, multiple heavy metal elements form composite pollution. In the field of science, there are too many adsorption studies on heavy metal single pollution. However, heavy metal pollutants come from a wide range of sources, have various forms, and have large content differences. Not only should a single pollution model be considered, but also multi-component heavy metal compound pollution in actual situations should be considered. [0003] There are ...

AI Technical Summary

Problems solved by technology

my country is a large agricultural country with abundant resources of agricultural and forestry wastes, which are usually burned directly, which not only fails to make rational use of resources, but also causes a series of environmental problems caused by the pollutants released by burning

[0005] After reviewing the patent literature, it is found that some straws, branches, fruit shells, and animal manures have been made into biochar and used in water to absorb heavy metals. However, the adsorption conditions are single and the adsorption effect is not ideal, especially for the adsorption of waste water. Copper ions and chromium ions, and the synchronous adsorption of copper ions and chromium ions in wastewater is even worse; on the other hand, traditional biochar still has high production costs and high sales prices, and the finished biochar still has Poor placement stability, leading to technical problems such as decreased adsorption performance