Immobilization of Trichoderma viride for enhanced methylene blue biosorption: Batch and column studies

“…The first phase involves a rapid adsorption of dye during the first 30 min followed by a slow phase of dye removal spread over a significantly longer period of time (>120 min) until the equilibrium is reached. According to the previous study [42], the rapid phase may last for several minutes to a few hours, while the slow stage continues for several hours to a day. The rapid phase probably occurs due to the availability of more active sites on the adsorbent.…”

Section: Effect Of Ds On CV Adsorptionmentioning

confidence: 92%

Recyclable Crosslinked O-Carboxymethyl Chitosan for Removal of Cationic Dye from Aqueous Solutions

Manish¹

2012

Hydrol Current Res

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Carboxymethyl chitosan have been investigated for many biomedical applications as well as for the removal of metal ion and cationic dye from aqueous solution. But, carboxymethyl chitosan is soluble in water and therefore, it is difficult to reuse. The aim of the work was to prepare cross-linked O-carboxymethyl chitosan (OCMCTS) with different degree of substitution for the removal of Crystal Violet (CV) cationic dye from aqueous solution. The influence of the parameters such as initial pH of the dye solution, initial dye concentration, adsorption temperature, degree of substitution of OCMCTS and adsorption time on the adsorption capacity was studied using batch method. The results showed that the adsorption capacity of modified CTS increased from 28.49 mg/g to 239.54 mg/g. The kinetic study of OCMCTS showed that it follows the pseudo-second-order kinetic rather than pseudo-first-order kinetic. The adsorption equilibrium showed that the experimental data could be best fitted to the Langmuir equation. The desorbed OCMCTS can be reused to absorb the cationic dyes. Therefore, cross-linked OCMCTS may be favorable adsorbent and could be employed as low-cost alternatives for the removal of cationic dyes in wastewater treatment.

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“…ions compete effectively with dye cations causing a decrease in the amount of adsorbed dye. At higher pH, the Luffa cylindrica fibers, mainly lignin and cellulose chains, become negatively charged, thus enhancing the cationic dye by electrostatic attraction forces [43,44].…”

Section: Effect Of Solution Phmentioning

confidence: 99%

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

et al. 2016

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In the present study, biomass fiber (Luffa cylindrica) has been successfully used as biosorbent for the removal of a cationic dye namely, methylene blue, from aqueous solution using a batch process. The characterization of the biosorbent was carried out by the infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The chemical composition has been established by the energy dispersive X-Ray spectroscopy (EDS). The effects of various parameters such as the contact time (0-160 min), solution pH (2-10), biosorbent dose (0.5-8 g L -1 ), particle size, initial MB concentration (20-300 mg L -1 ) and temperature (20-60°C) were optimized. The biosorption isotherms were investigated by the Langmuir, Freundlich, Dubinin-Radushkevich and Tempkin models. The data were well fitted with the Langmuir model, with a maximum biosorption capacity of 49.46 mg g -1 at 20°C. The kinetics data were analyzed by the pseudo-first-order and pseudo-second-order models. The mass transfer model in terms of interlayer diffusion was applied to examine the mechanisms of the rate-controlling step (R 2 = 0.9992-0.9999). The thermodynamic parameters: free energy (DG°= -5.428 to -3.364 kJ mol -1 ), enthalpy (DH°= -20.547 kJ mol -1 ) and entropy (DS°= -0.052 kJ mol -1 K -1 ) were determined over the temperatures range (20-60°C). The results indicate that Luffa cylindrica could be an interesting biomass of alternative material with respect to more costly adsorbents used nowadays for dye removal.

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Immobilization of Trichoderma viride for enhanced methylene blue biosorption: Batch and column studies

Cited by 83 publications

References 54 publications

Adsorption of hazardous dye crystal violet from wastewater by waste materials

Adsorption of hazardous dye crystal violet from wastewater by waste materials

Recyclable Crosslinked O-Carboxymethyl Chitosan for Removal of Cationic Dye from Aqueous Solutions

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

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