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SEM images of zinc oxide/biochar hybrids prepared by using the pretreatment method (a) pyrolysis of biomass impregnated with zinc chloride (adapted with permission from ref (56)), (b, c) thermolysis of zinc acetate impregnated biomass (adapted with permission from ref (17)), (d, e) impregnation of biochar by mechanical mixing (adapted with permission from ref (52)), and (f) post-treatment impregnation with zinc nitrate (adapted with permission from ref (53)).
