Abstract
Adsorption in biomass has proven to be a cost-effective option for treatment of wastewater containing dyes and other pollutants, as it is a simple and low cost technique and does not require high initial investments. The present work aimed to study the adsorption of methylene blue dye (MB) using sugarcane bagasse (SCB). The biomass was characterized by scanning electron microscopy (SEM). Adsorption studies were conducted batchwise. Kinetics, adsorption isotherms, and thermodynamics were studied. The results showed that SCB presented a maximum adsorption capacity of 9.41 mg g−1 at 45 °C after 24 h of contact time. Adsorption kinetics data better fitted the pseudo-second order model, indicating a chemical process was involved. The Sips’s three-parameter isotherm model was better for adjusting the data obtained for the adsorption isotherms, indicating a heterogeneous adsorption process. The process showed to be endothermic, spontaneous, and feasible. Therefore, it was concluded that SCB presented as a potential biosorbent material for the treatment of MB-contaminated waters.
Highlights
With increasing technological development, the world is changing
Verifying the availability of the sugarcane bagasse (SCB) raw material and its characteristics, as well as the demand for alternative wastewater treatment processes, this work aimed to study the removal of methylene blue dye (MB) in aqueous solution using SCB as a low-cost biosorbent
For the kinetics adsorption experiments, performed in duplicate, 100 mg of SCB was added to 50 mL of MB solution (5 mg/L)
Summary
The world is changing. Consequences of rapid growth include environmental disturbances and pollution problems. Dyes are an important class of industrial pollutants in fields involving paper, leather tanning, food processing, plastics, cosmetics, rubber, printing, dye manufacturing, and textiles They are organic compounds that have a complex aromatic molecular structure that connect themselves to surfaces to impart color. Water body pollution by dyes may be toxic to aquatic organisms, be resistant to natural biological degradation [1], and cause changes in biological cycles They pose risks to human health, as studies show that some of these products can be carcinogenic or mutagenic, and cause allergies, dermatitis, and skin irritation [4]. SCB is an abundant, inexpensive, and promising type of industrial waste with a lignin cellulose and polymeric structure (50% cellulose, 25% hemicellulose, and 25% lignin) [9] Utilization of this agricultural waste as low-cost adsorbent could provide a two-fold advantage with respect to environmental pollution. Verifying the availability of the SCB raw material and its characteristics, as well as the demand for alternative wastewater treatment processes, this work aimed to study the removal of methylene blue dye (MB) in aqueous solution using SCB as a low-cost biosorbent
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