Composite sorbents based on waste from the crystalline silicon production and biochar

The aim of this paper was to create a composite porous material based on waste from the crystalline silicon production and biochar from agricultural waste for sorption wastewater purification from copper. In the paper, we proposed a method for pelletizing fine crystalline silicon (gas treatment waste) and biochar from agricultural waste using liquid glass. The choice of liquid glass is due to the fact that this substance has high adhesive properties for the formation of durable composites, as well as an excess of alkali, which contributes to the exothermic reaction and the evolution of hydrogen gas upon the addition of finely divided silicon, as a result of which the composite material acquires a porous structure. Using the optical emission research method, we found that the samples of the prepared sorbents mainly consist of both macropores and meso- and micropores, the dimension of which depends on the ratio of components. In the course of research, we identified the optimal ratios and studied the mechanical and sorption properties of composite materials.