Dye adsorption by prehydrolysed beech sawdust in batch and fixed-bed systems

Batzias, F.A.; Sidiras, D.K.

doi:10.1016/j.biortech.2006.05.020

Cited by 143 publications

(71 citation statements)

References 35 publications

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“…The positive ions (H + ) provide an electrostatic attraction between the fibers surface and the dye molecules leading to maximum adsorption. On the other hand, at pH above 3 (i.e., pH range of 4-8) the degree of protonation of the surface of the fibers will be less which result in the decrease in diffusion and adsorption thereby due to electrostatic repulsion [41,42] . Furthermore, lower adsorption of the direct dyes in alkaline medium can also be attributed to the competition from excess hydroxide ions (OH − ) with the anionic dye molecules for the adsorption sites.…”

Section: Effect Of Phmentioning

confidence: 99%

The Removal of Methyl Red from Aqueous Solutions Using Banana Pseudostem Fibers

Haris¹,

Sathasivam²

2009

American J. of Applied Sciences

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Problem statement:The aim of this study was to investigate the removal of methyl red, a mutagenic monoazo dye, from various aqueous solutions using banana pseudostem fibers of the size 212-350 micron. Approach: The parameters studied were the effect of pH, amount of adsorbent, contact time, concentration of adsorbate and agitation speed. Results: Equilibrium data were fitted to the Langmuir and Freundlich isotherm models. The data were best represented by the latter with an adsorption capacity and adsorption intensity of 0.351 and 0.302, respectively. Conclusion/Recommendations: Specific rate constants of the processes were calculated by kinetic measurements and a pseudo second order adsorption kinetics was obtained for all cases.

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Section: Effect Of Phmentioning

confidence: 99%

The Removal of Methyl Red from Aqueous Solutions Using Banana Pseudostem Fibers

Haris¹,

Sathasivam²

2009

American J. of Applied Sciences

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“…Although commercial activated carbon is a very effective adsorbent, its high cost requires the search for alternatives and low-cost adsorbents (Pollard et al 1992). Several low-cost adsorbents have been tested for removing dyes (Garg et al 2004) including peat, pith, orange peel, Indian Rosewood (Pollard et al 1992), cellulose based wastes, giant duckweed, banana pith and other agricultural by-products (Garg et al 2004;Elmorsi 2011;Batzias and Sidiras 2007;Juang et al 2007;Malik 2004;Namasivayam et al 2001). On the other hand, seed husk of melon (Citrillus lanatus) is a common locally available agrowaste found widely in different areas in southwestern Nigeria, in addition to other parts of the country.…”

Section: Introductionmentioning

confidence: 99%

Competitive adsorption of dye species from aqueous solution onto melon husk in single and ternary dye systems

Olajire

Giwa

Bello

2014

Int. J. Environ. Sci. Technol.

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Polluted water may contain more than one dye species. Consequently, the behavior of a particular dye in a water system may be affected by the presence of the others. In this study, the adsorption of methylene blue (MB) in single dye system (SDS) and in ternary dye system (TDS) comprising of MB, congo red and methyl orange onto formaldehyde-treated melon husk (FMH) was investigated as a function of pH, contact time and species concentrations. Surface studies of FMH were investigated by Fourier transform infrared and scanning electron microscopy. The dye species adsorption equilibria were rapidly attained after 60 (SDS) and 90 min (TDS) of contact times. The adsorption kinetics were analyzed using pseudo first-order, pseudo second-order and intraparticle diffusion models and the adsorption data were well described by the pseudo second-order model. The equilibrium adsorption data were interpreted in terms of the Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Harkin-Jura and Halsey isotherm models and the goodness of fittings were inspected using linear regression analysis (R 2 ). Our results indicated that the Langmuir model was best fitted, suggesting monolayer adsorption. Thermodynamic study showed that the adsorptions in SDS and TDS on FMH are favourable. The change in entropy (DS°) and heat of adsorption (DH°) of dye species on FMH in TDS were estimated as 82.2 J/ mol K and 17.95 kJ/mol. respectively while in SDS, they were respectively -43.76 J/mol K and -21.84 kJ/mol. The sorption process in both systems was thermodynamically feasible with negative DG°values.

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“…The Clark model introduces a new procedure to simulate the breakthrough curves using the Freundlich isotherm constant (Batzias and Sidiras 2007). The linearized form of the model can be represented as…”

Section: Yoon-nelson Modelmentioning

confidence: 99%

Fixed-bed column study for the adsorptive removal of acid fuchsin using carbon–alumina composite pellet

Dutta

Basu

2013

Int. J. Environ. Sci. Technol.

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The carbon-alumina composite pellet was developed for the adsorption of acid fuchsin from its aqueous solution. The composite pellet was characterized using Brunauer-Emmett-Teller method, scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy. The adsorption capacity of commercial alumina, commercial activated carbon and the prepared composite pellet was investigated against acid fuchsin, and the adsorption capacity was found to be increased in the order of alumina \ carbon-alumina composite pellet \ activated carbon. Although the adsorption capacity of carbon-alumina composite pellets was less than that of activated carbon, the use of the pelletized form of the present adsorbent was proven to be advantageous for the use in the packed-bed column. The experimental data were fitted to Langmuir, Freundlich and Temkin adsorption isotherms, and the equilibrium behavior was well explained by Langmuir isotherm. Besides, the kinetic behavior was well predicted by pseudo-second-order kinetics. The effects of inlet dye concentration (10-20 mg/L), feed flowrate (5-15 mL/min) and bed height (2.54-7.62 cm) on the breakthrough characteristics were investigated using a fixed-bed column. The maximum removal capacity in the column study was found to be 343.87 mg/L with an initial dye concentration and flowrate of 20 and 10 mL/min according to Bohart-Adams model. The breakthrough behavior was also effectively described by the Yoon-Nelson and Clark models.

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Dye adsorption by prehydrolysed beech sawdust in batch and fixed-bed systems

Cited by 143 publications

References 35 publications

The Removal of Methyl Red from Aqueous Solutions Using Banana Pseudostem Fibers

The Removal of Methyl Red from Aqueous Solutions Using Banana Pseudostem Fibers

Competitive adsorption of dye species from aqueous solution onto melon husk in single and ternary dye systems

Fixed-bed column study for the adsorptive removal of acid fuchsin using carbon–alumina composite pellet

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