preprint · Research Square (Research Square)
Abstract Experimental and theoretical investigations related to the adsorptive removal of Basic blue 9 (BB9) onto γ-nanoAl 2 O 3 have been done in the present work. Batch tests were carried out varying some processing parameters namely initial dye concentration (5 - 50 mg/L), adsorbent dose (0.5 - 5 g/L), initial pH (1 - 12) and contact time (0 - 30 min). Under conditions of C 0 = 50 mg/L; pH = 11; dose = 1g/L and t = 15 min, more than 83.6% of the BB9 molecules were removed. The pseudo-second order and the Langmuir models fit well the experimental data with highest R 2 values of 0.99 and 0.91 respectively and lowest values of χ 2 . This suggests a two- step mechanism on a homogeneous distribution of active sites on the adsorbent surface. The adsorption mechanism first involved electrostatic interactions between the negatively charged γ-nanoAl 2 O 3 surface in basic medium and secondly electrophilic-nucleophilic interactions. Compared to other adsorbents, γ-nanoAl 2 O 3 of this work is a good alternative for treatment water containing dye BB9.
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DOI: 10.21203/rs.3.rs-3827286/v1
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