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Acid orange 7 (AO7) is a monoazo acid dye currently used in paper and textile industries. The modelling and optimisation of AO7 adsorption to spent brewery grains (SBG), a by-product of the brewing process, was performed using response surface methodology (RSM). SBG was used dried or previously acid hydrolysed. Five central composite rotatable designs (CCRD), as a function of two variables, each,...
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