Box-behnken design 2 COD reduction 2 Chitosan 2 Glyoxal 2 Kaolin 2 Remazol brilliant blue R AQUEOUS-SOLUTION 1 AZO-DYE 1 Adsorption capacities 1 BIOMASS 1 Biopolymers 1 Clay 1 Color 1 Composite biosorbents 1 Cross linked chitosan 1 Crystallinity 1 Dyes 1 ENHANCED ADSORPTION 1 KINETICS 1 Langmuir and Freundlich isotherm models 1 METAL-IONS 1 Morphology 1 NANOCOMPOSITE 1 Parametric optimization 1 Potentiometric titrations 1 RESPONSE-SURFACE METHODOLOGY 1 Remazol Brilliant Blue R 1 Response surface methodology 1 SORPTION 1 Stripping (dyes) 1