Preparation method for composite activated biochar capable of adsorbing heavy metal ions in sewage

Abstract

The invention discloses a preparation method for composite activated biochar capable of adsorbing heavy metal ions in sewage. According to the preparation method, a saponification-modified orange peelbio-adsorbent, an obtained pine needle-based carbon material, puffed rice husks, a chestnut shell activated carbon material and walnut green husk biochar are uniformly mixed so as to obtain the composite activated biochar. The preparation method has the advantages that pine needles serve as a carbon source, alkali treatment is carried out, then carbonizing is carried out, so that the pine needle-based carbon material with developed pore channel structures and high nitrogen content is successfully prepared, by means of the developed pore channel structures and rich nitrogen-contained functional groups, and the prepared pine needle-based carbon material shows good adsorption performance on the metal ions and has good repeated use performance; chestnut shells serve as a raw material, activated carbon is prepared by adopting a ZnCl2 activation method, the chestnut shell activated carbon is an amorphous carbon material with more pores; and biological waste orange peels serve as a raw material, and ethanol and sodium hydroxide treatment are carried out so as to obtain the modified orange peel biological adsorbent.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a preparation method of composite activated biochar capable of absorbing heavy metal ions in sewage. Background technique [0002] The rapid development of modern industry produces a large amount of wastewater containing heavy metals, and heavy metals are a type of pollutant that is extremely harmful to the ecological environment. Because they cannot be biodegraded after entering the environment, they often participate in the food chain cycle and eventually accumulate in the organism, destroying The normal physiological and metabolic activities of organisms endanger human health. How to eliminate the hazards of heavy metals and effectively recover precious metals is a prominent problem facing environmental protection today. With the deepening of economic globalization and the rapid development of our society, the pollution of heavy metal ions has become a killer that ...

AI Technical Summary

Problems solved by technology

In order to better develop and utilize the chestnut shells of agricultural and forestry wastes, and promote energy conservation and emission reduction, domestic and foreign research on chestnut shells has involved the use of chestnut shells for sewage treatment, but chestnut shells are directly used for heavy metal ion adsorption, and the adsorption capacity is low. Low, needs further improvement