Exploring the use of melon husk an agriculture waste for the removal of dye molecules from aqueous solution Chionyedua T. Onwordi 1 , Ridwan A. Borokinni 1 , Oluwapelumi Y. Cole, Cosmas C. Uche 2 , Ibrahim O. Adetunji and Olawale L. Osifeko 1 . 1 Department of Chemistry, Lagos State University, Lagos Nigeria, 2 Department of Environmental Technology , Federal University of Technology, Owerri, Nigeria. Environmental violations caused by poorly treated textile effluents have caused major problem towards aquatic life and the stability of the aquatic ecosystem in rivers or lakes. The use of beans husk in the abatements of hazardous contaminants such as dye and treatment of synthetic industrial wastewater is largely unexplored. Methylene blue dye is a cationic dye found frequently in industrial and urban sewage. SDG 6.3 targets on improve water quality by reducing pollution; hence this research is designed to remove methylene blue dye using bean husk by adsorption batch process. Effect of pH, adsorbent dosage, dye concentration, contact time and temperature were explored. The adsorption experimental data were fitted using Langmuir, Freundlich and Temkin isotherms. Kinetic studies using pseudo-first-order and pseudo-second order were determined. Thermodynamics studies (entropy, enthalpy and Gibb's free energy) were conducted to elucidate the adsorption mechanisms. The results for the experiment for % removal and adsorption capacity show that the optimal pH is 10 with 93.8% and 0.83 mg/g. The optimal dosage is 1.2 g/l with 82.95% and 0.64 mg/g. The optimal concentration is 30 mg/L with 85.26% and 0.612 mg/g. The optimal contact time is 60 minutes with 74.82% and 0.296 mg/g. The optimal temperature is 45°C with 81.75% and 0.551 mg/g. Experimental data showed a good fit with Langmuir isotherm having R 2 = 0.8856. The bean husk adsorption kinetics is best fit to the pseudo-second-order model having R 2 = 0.995. Thermodynamics parameters indicate that the adsorption process of methylene blue dye unto bean husk is spontaneous, feasible and endothermic reaction in nature. Overall, the results suggest that beans husk may be employed as a low cost, effective and environmentally acceptable adsorbent for the removal of methylene blue dye from synthetic wastewater. References 1. Jalali, K., Pajootan, E. and Bahrami, H.“(2019), “Elimination of hazardous methylene blue from contaminated solutions byelectrochemically magnetized graphene oxide as a recyclable adsorbent,”” Advanced Powder Technology, 30, 2352-2362. 2. Hu, N., Zhang, K., Zhao, Y., Zhang, Z. and Li, H. (2020), "Flotation-based dye removal system: Sweet potato protein fabricated from agro-industrial waste as a collector and frother, 269Gemici, B.T.; Ozel, H.U.; Ozel, H.B. (2021), “Removal of methylene blue onto forest wastes: Adsorption isotherms, kinetics and thermodynamic analysis.” Environmental Technology & Innovation, 22, 101-501
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