Each group needs:

• 8 clear plastic 2-oz. cups with lids
• methyl orange solution; 3 ml for each sample and 3 ml for the control (equivalent to 1 full pipette, approx. 12 ml); 30 ml for $4.50 from Home Science Tools
• methylene blue solution; 3 ml for each sample and 3 ml for the control (equivalent to 1 full pipette, approx. 12 ml); 30 ml for $4.50 from Home Science Tools
• titanium dioxide (TiO₂) sample solution (prepared by teacher using 5 g TiO₂); enough for both dye samples (3 drops = 1 sample); 100 g of TiO₂ nanopowder for $64 from SkySpring Nanomaterials
• magnesium oxide (MgO) sample solution (prepared by teacher using 5 g MgO); enough for both dye samples (3 drops = 1 sample); 25-g MgO nanopowder for $43 from SkySpring Nanomaterials
• zinc oxide (ZnO) sample solution (prepared by teacher using 5 g ZnO); enough for both dye samples (3 drops = 1 sample); 100-g ZnO nanopowder for $50 from SkySpring Nanomaterials
• 220 ml distilled water
• stopwatch
• 6 plastic pipettes
• 50-ml graduated cylinder, to measure distilled water
• black permanent marker pen, to label samples
• safety equipment: lab apron, safety goggles, gloves

To share with the entire class:

• Photocatalysis Presentation, Microsoft® PowerPoint® file
• Titanium dioxide (TiO₂) smart coat photocatalyst YouTube video
• computer with internet connection and projector, to show the slide presentation and online video
• access to outside; sunlight is the UV light necessary for photocatalytic reactions