Methylene blue sorption by the chemically modified ocimum basilicum leaves powder

Abstract

Chemically modified Ocimum basilicum leaves powder (CMOBLP) adsorbent was used for the elimination of Methylene Blue (MB) from aqueous solutions. The morphology of CMOBLP was identified by microscopy of scanning electron and Fourier transform infrared technics. The porosity and surface area of the prepared CMOBLP have also been determined by applying a Brunauer– Emmett–Teller (BET) surface analyzer. The influences of MB primary concentration, temperature, sorption time, and solution pH were studied. The parameters of kinetics were evaluated, and the obtained results suggest that MB sorption by CMOBLP follows the model of the second-order. Thermodynamic outcomes pointed to that the MB sorption by CMOBLP is exothermic and spontaneous. Isotherm models of Langmuir, Freundlich, and Temkin were applied, and the experimental data were fitted well with the model of Langmuir, proposing monolayer sorption. The present study strongly reveals that CMOBLP is a very effective adsorbent. The sorption capacities of 714.29, 666.67, 625.00, and 555.56 mg/g were obtained at 20°C, 30°C, 40°C, and 50°C, respectively.