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Adsorption of Reactive Black 5 and Basic Blue 12 using biochar from gasification residues: Batch tests and fixed-bed breakthrough predictions for wastewater treatment

2021; Elsevier BV; Volume: 15; Linguagem: Inglês

10.1016/j.biteb.2021.100767

2589-014X

Bruna Figueiredo do Nascimento, Caroline Maria Bezerra de Araújo, Alisson Castro do Nascimento, Gabriel Rodrigues Bezerra da Costa, Brener Felipe Melo Lima Gomes, Maryne Patrícia da Silva, Ronald Keverson da Silva Santos, Maurı́cio Alves da Motta Sobrinho,

Recycling and Waste Management Techniques

This work aimed to evaluate the adsorption of Reactive Black 5 (RB5) and Basic Blue 12 (BB12) dyes using biochar from gasification of wood waste. Langmuir isotherm fit better to experimental data, exhibiting maximum adsorption capacities of 35.67 mg·g−1 (RB5), and 80.41 mg·g−1 (BB12). Kinetics indicated the equilibrium was reached after 90 min for RB5 and 180 min for BB12, and Elovich model best represented the experimental points. Kinetics were also modeled following a phenomenological approach, and Linear Driving Force parameters were used to predict breakthrough curves. Simulations on continuous adsorption were performed for bench and pilot scales. Breakthrough curves estimated that 100 L of RB5, and 224 L of BB12 solution can be treated in a fixed-bed pilot plant. Although the biochar lost over 50% of its adsorption capacity after regeneration, it has high potential to remove cationic and anionic dyes, contributing to the circular economy by adding value to biomass residues.