“…Adsorption of mixture of cationic and non-ionic surfactants on a negatively charged alumina [1,69,124], silica [128], limestone [129], teflon [130] and on kaolinite [125]. In case of adsorption of cationic and non-ionic surfactant on negatively charged alumina from their mixture, similar to anionic and non-ionic surfactant mixture onto positively charged solid, the adsorption of tetradecyl-trimethyl-ammonium chloride (TTAC) and pentadecylethoxylated-nonyl-phenol (NP-15) on alumina from their mixture have been studied [1].…”