Nanoporous Biochar for Removal of Toxic Organic Compounds from Water
The samples of biochar have been synthesized by chemical carbonization of disaccharide (lactose) and polysaccharide (dextrin). The method excludes thermal treatment under high temperature. Porous structure of the low-cost adsorbents involves nanosized mesopores, a radius of which is 2 nm. They contribute to specific surface area and provide adsorption of large organic molecules, such as dyes and pesticides. The adsorbent produced from the polysaccharide is characterized by higher amount of functional groups comparing with that obtained from the disaccharide. The specific capacitance of a condenser, which involves the carbon electrodes, reaches 0.026 (lactose) and 0.072 F m−2. The degree of removal of toxic organic compounds from water is above 99%. In the case of epoxiconazole and carboxin, it is possible to decrease their content in water down to the maximal allowable concentration. Adsorption capacity was estimated as 79 and 120 mg g−1, respectively.
KeywordsNanopores Biochar Nanosized organic molecules Adsorption Electrode capacitance
The work was performed within the framework of the project entitled “Developments of materials and processes for removal of valuable and toxic components from the solutions of biogenic and technogenic origin” supported by the NAS of Ukraine.
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