Biosorption of basic violet 10 onto activated Gossypium hirsutum seeds: Batch and fixed-bed column studies

doi:10.1016/j.cjche.2015.08.029

摘要/Abstract

摘要： Sulphuric acid activated immature Gossypium hirsutum seed (AIGHS) was prepared to biosorbe basic violet 10 (BV10) from aqueous solutions. Methylene blue number, iodine number and Brunauer-Emmett-Teller surface analysis indicated that the AIGHS were hetero-porous. Boehm titrations and Fourier-transform infrared spectra demonstrated the chemical heterogeneity of the AIGHS surface. Batch biosorption studies were used to examine the effects of process parameters in the following range: pH 2-12, temperature 293-313 K, contact time 1-5 h and initial concentration 200-600 mg·L^-1. The matching of equilibrium data with the Langmuir-Freundlich formof isotherms indicated that the BV10 was adsorbed via chemisorption and pore diffusion. Kinetic investigation indicated multiple order chemisorption through an Avrami kinetic model. Film diffusion controlled the rate of BV10 biosorption onto AIGHS. The spontaneous and endothermic nature of sorptionwas corroborated by thermodynamic study. Continuous biosorption experimentswere performed using a fixed-bed column and the influence of operating parameters was explored for different ranges of initial concentration 100-300 mg·L^-1, bed height 5-10 cm, and flow rate 2.5-4.5 ml·min^-1. A dose response model accurately described the fixed-bed biosorption data. An external mass transfer correlation was formulated explaining BV10-AIGHS sorption.

关键词: Gossypium hirsutum seed, Isotherm, Kinetic, Fixed-bed, Mass transfer

Abstract: Sulphuric acid activated immature Gossypium hirsutum seed (AIGHS) was prepared to biosorbe basic violet 10 (BV10) from aqueous solutions. Methylene blue number, iodine number and Brunauer-Emmett-Teller surface analysis indicated that the AIGHS were hetero-porous. Boehm titrations and Fourier-transform infrared spectra demonstrated the chemical heterogeneity of the AIGHS surface. Batch biosorption studies were used to examine the effects of process parameters in the following range: pH 2-12, temperature 293-313 K, contact time 1-5 h and initial concentration 200-600 mg·L^-1. The matching of equilibrium data with the Langmuir-Freundlich formof isotherms indicated that the BV10 was adsorbed via chemisorption and pore diffusion. Kinetic investigation indicated multiple order chemisorption through an Avrami kinetic model. Film diffusion controlled the rate of BV10 biosorption onto AIGHS. The spontaneous and endothermic nature of sorptionwas corroborated by thermodynamic study. Continuous biosorption experimentswere performed using a fixed-bed column and the influence of operating parameters was explored for different ranges of initial concentration 100-300 mg·L^-1, bed height 5-10 cm, and flow rate 2.5-4.5 ml·min^-1. A dose response model accurately described the fixed-bed biosorption data. An external mass transfer correlation was formulated explaining BV10-AIGHS sorption.

Key words: Gossypium hirsutum seed, Isotherm, Kinetic, Fixed-bed, Mass transfer

N. Sivarajasekar, R. Baskar. Biosorption of basic violet 10 onto activated Gossypium hirsutum seeds: Batch and fixed-bed column studies[J]. Chinese Journal of Chemical Engineering, 2015, 23(10): 1610-1619.

N. Sivarajasekar, R. Baskar. Biosorption of basic violet 10 onto activated Gossypium hirsutum seeds: Batch and fixed-bed column studies[J]. Chin.J.Chem.Eng., 2015, 23(10): 1610-1619.

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