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Schematic diagram for the synthesis procedures of curcumin intercalated bentonite (50 mL bentonite suspension ((4.4 g) + 50 mL water) + 50 mL curcumin extract (3.7 g of curcumin + 100 mL of ethanol (60%)) and ZnO@CU/BE composite (100 mL bentonite/zinc nitrate mixture (4.4 g bentonite + 2.2 g of Zn(NO3)2.6H2O + 100 mL water) + 100 mL curcumin extract (3.7 g of curcumin + 100 mL of ethanol (60%)).
