Adsorption of Indigo Carmine Dye and Copper Ion by Kaolin from Bangka Island

Indigo Carmine (IC) is a synthetic dye that might promote irritations, vomiting, and diarrhea when orally consumed in high concentrations. Copper dangerous heavy metal tends to accumulate organisms' cells as pollutant. Hyperproduction of IC accumulation copper water could cause an environmental problem must be adequately addressed. Kaolin found abundant on Bangka Island. Based XRD analysis, Island from consists two important minerals, Kaolinite Rectorite. has chemical physical properties, which make it useful several applications, including adsorbent. This study aims evaluate how can adsorb ion acid wastewater (pH < 0.5) determine natural Kaolin's ability aqueous solution. Many factors, mixing time number doses Kaolin, influence absorb IC. The longer the stirring time, more absorbed. optimal temperature for adsorption 25˚C. kaolin dose 20% (m/v). concentration after application decrease, with at 25.09% (m/v) dosage 19.23% removal.