PHOTOCATALITIC EFFECTIVENESS OF TiO2 COMPOSITED WITH ACTIVATED CARBON AND PRECIPITATED CALCIUM CARBONAT FOR REDUCTION OF CHROMIUM FROM ELECTROPLATING INDUSTRY - Naimah, Siti; Balai Besar Kimia dan Kemasan, Kementerian Perindustrian Jl. Balai Kimia No 1. Pekayon - Pasar Rebo, Jakarta (BATAN, 2013)