A B S T R A C TThe study tries to determine the optimal condition to achieve the maximum Cr(VI) removal in the biosorption process from aqueous solution using acid-treated date palm fiber as the biosorbent. Three factors including initial pH, initial Cr(VI) concentration, and biosorbent dosage were optimized using response surface methodology. Maximum Cr(VI) removal was 95% at the optimum condition of initial pH 3.3, initial Cr(VI) concentration 180 (mg/L), and biosorbent dosage of 0.8% (w/v). The kinetic study was done to acquire a deeper understanding of the mechanism of biosorption process and its results showed that the pseudosecond-order models controlled the process. Isotherm study showed that Langmuir model described the experimental data thoroughly.
A B S T R A C TThis work aimed to determine the optimum conditions in order to reach the maximum remazol brilliant blue (RBB) removal and maximum adsorption capacity (uptake) in the sorption process from aqueous solution using multi-walled carbon nanotube (MWCNT). Three factors including initial RBB concentration, initial pH, and initial amount of MWCNTs were optimized using response surface methodology at equilibrium time 15 min. Optimized conditions were RBB concentration 8 × 10 −2 mmol/L, initial pH 4.3, and 250-mg MWCNTs. The maximum values for the RBB removal and uptake were 69.06% and 1.1 × 10 −2 mM/g, respectively. Among the three used isotherm models including Langmuir, Freundlich and Temkin, the Langmuir isotherm was best fitted with the experimental data because of its higher coefficient value R 2 = 0.99.
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