Best utilization of biomass for wastewater treatment. Removal of brilliant green dye from aqueous solutions using activated carbon derived from guava seeds and date pits

      Аннотация: A single-stage batch adsorber was designed for the adsorption of brilliant green dye by activated carbons prepared from guava seeds (AGSC) and date pits (ADPC) based on optimum isotherm. Experimental work was carried out by studying contact time (5 – 65 min), dosage (0.01 – 0.08 g), temperature (25 – 95?), pH (3 – 10), and initial dye concentration (10 – 100 ppm) parameters. Some adsorption isotherm models were applied, for instance, Langmuir where the maximum adsorption capacities of AGSC and ADPC were found to be 80.5 and 77.8 mg/g respectively, Freundlich, Temkin, and Dubinin-Radushkevich; In addition to some adsorption kinetics models for example, Pseudo-first order, Pseudo-second order, Elovich, and Intra-particle diffusion model. The process efficiency was assessed by Fourier Transform Infrared Spectroscopy, Scanning Electron Microscope, Energy-Dispersive X-ray Spectroscopy, and Brunauer-Emmett-Teller where the latter showed that the specific surface area of AGSC and ADPC are 605.1 and 311.4 m2/g respectively. The thermodynamic study proved that brilliant green adsorption on AGSC and ADPC were physiosorptive and spontaneous at high and low temperatures.

Ключевые слова: Wastewater treatment, adsorption, activated carbon, Brilliant green dye, Biomass utilization