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Batch and dynamic biosorption of basic dyes from binary solutions by alkaline-treated cypress cone chips.

M E Fernandez¹, G V Nunell, P R Bonelli

¹Programa de Investigación y Desarrollo de Fuentes Alternativas de Materias Primas y Energía, Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2620, Ciudad Universitaria, C1428BGA Buenos Aires, Argentina.

Bioresource Technology

|December 27, 2011

Summary

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Alkaline pre-treatment of cypress cone chips enhances biosorption of methylene blue and rhodamine B. Modified chips show improved capacity and selectivity for methylene blue in water treatment.

Area of Science:

Environmental Science
Materials Science
Chemical Engineering

Background:

Industrial wastewater often contains persistent organic pollutants like dyes.
Biosorption offers a sustainable method for dye removal from aqueous solutions.
Cupressus sempervirens cone chips are a potential low-cost biosorbent material.

Purpose of the Study:

To investigate the efficacy of alkaline pre-treatment on Cupressus sempervirens cone chips for dye biosorption.
To evaluate biosorption kinetics and equilibrium of methylene blue and rhodamine B.
To assess the performance of modified biosorbents in batch and continuous modes.

Main Methods:

Alkaline pre-treatment of Cupressus sempervirens cone chips.
Batch and continuous mode biosorption experiments with methylene blue and rhodamine B.

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Kinetic modeling using pseudo-second-order rate model.

Isotherm modeling using Langmuir-Freundlich model.

Main Results:

Alkaline pre-treatment significantly improved biosorption capacity and performance.
Maximum biosorption capacities were 0.68 mmol/g for methylene blue and 0.50 mmol/g for rhodamine B.
Methylene blue exhibited a longer breakthrough time and preferential adsorption over rhodamine B.

Conclusions:

Cupressus sempervirens cone chips, after alkaline modification, are effective biosorbents for methylene blue and rhodamine B.
The pseudo-second-order and Langmuir-Freundlich models accurately describe the biosorption process.
Alkaline pre-treatment enhances the biosorption performance and selectivity for methylene blue, indicating potential for wastewater treatment applications.