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UV–vis absorption spectra of MB degradation with Ag@biochar at different reaction times and different MB concentrations of 10 (a), 25 (b), and 50 ppm (c); photodegradation of MB (25 ppm) using pristine biochar, (d) photodegradation of MB (25 ppm) using only UV irradiation, (e) kinetics of photocatalytic degradation of MB (25 ppm) using Ag@biochar, and (f) recycling of Ag@biochar against MB (25 ppm) (g).
