Kinetics and isotherms of leather dye adsorption by tannery solid waste

Piccin, Jeferson Steffanello; Gomes, Carolina Scaraffuni; Féris, Liliana Amaral; Gutterres, Mariliz

doi:10.1016/j.cej.2011.12.013

Cited by 163 publications

(76 citation statements)

References 40 publications

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“…In the Langmuir adsorption model, adsorption of adsorbate takes place at specifi c homogeneous sites within the adsorbent and valid for monolayer adsorption onto adsorbents. But, the Freundlich model applies to adsorption on heterogeneous surfaces with interaction between adsorbed molecules 40 . The coeffi cients and non-linear R 2 values for both isotherm models are given in Table 2.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

Hosseinzadeh

2015

Polish Journal of Chemical Technology

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A novel polysaccharide-based hydrogel nanocomposite was prepared using grafting of acrylic acid (AA) on to kappa-carrageenan (κC) by incorporating multi-walled carbon nanotube (MCNT). In fact, MCNTs were used as nano-sized reinforcements in the synthesized nanocomposite. Spectroscopy together with morphology proved relatively strong κC-MCNT interaction. Besides, the swelling behavior of the nanocomposite hydrogel was studied. The results showed that in the presence of MCNTs, the equilibrium swelling capacity was decreased. This can be attributed to cross-linking role and hydrophilicity nature of MCNTs. The adsorption performance of hydrogel nanocomposite was also investigated for the removal of crystal violet (CV) as a cationic dye. The effects of some important parameters such as MCNT concentration, pH and contact time on the uptake of CV solution were studied. Equilibrium adsorption isotherm data of the hydrogel exhibited better fi t to the Langmuir than to the Freundlich isotherm model. According to this model, the maximum adsorption capacity of κC-based hydrogel nanocomposite was found to be 118 mg . g -1.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

Hosseinzadeh

2015

Polish Journal of Chemical Technology

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“…The pseudo-first order and pseudo-second order models were used to examine the kinetics adsorption process. The pseudo-first order indicates the intraparticle diffusion model which adsorption is controlled by diffusion into the boundary layer [10] while pseudo-second indicates the chemisorption process. The correlation coefficient (R 2 ) can be evaluated and the adsorption capacities between calculated and experimental values can be compared.…”

Section: Effect Of Adsorbent Dosagementioning

confidence: 99%

Adsorption of Ni(II) onto Chemically Modified Spent Grated Coconut (Cocos Nucifera)

Hamzah

Khalid

Hanafiah

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract.A new adsorbent of plant waste origin from coconut processing food factory was explored for removing Ni(II) from aqueous solutions. Several parameters such as pH, dosage, concentration and contact time were studied to obtain optimum conditions for treatment of Ni(II) contaminated wastewater. Spent grated coconut (Cocos nucifera) treated with sulfuric acid (SSGC) showed good adsorption capacity for Ni(II) ion. The amount adsorbed was affected by solution pH with the highest value achieved at pH 5. Other optimum conditions found were; dosage of 0.02 g, and 60 min of equilibrium time. Ni(II) adsorption obeyed the pseudo-second order kinetic model which suggested that chemisorption mechanism occurred in the adsorption process. The equilibrium data presented a better fitting to the Langmuir isotherm model, an indication that monolayer adsorption occurred onto a homogeneous surface. The maximum adsorption capacity, q max was 97.09 mg g -1 , thus SSGC can be classified as good and comparable with other plant waste adsorbents.

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“…These residues were dried under vacuum conditions (À500 mmHg) at 60 C for 48 h (Piccin et al, 2012). TSW were cut in rectangular shape (3.31 mm Â 3.31 mm) with thickness of 0.50 mm.…”

Section: Obtainment Of the Tswmentioning

confidence: 99%

“…It is estimated that about 6-12 L of colored effluents are generated per kilogram of wet blue leather, during the wet finishing process (Piccin et al, 2012). The inadequate release of these colored effluents in aqueous ecosystems is esthetically unpleasant and leads to a reduction of sunlight penetration, which in turn, decreases the photosynthetic activity, dissolved oxygen concentration, and water quality.…”

Section: Introductionmentioning

confidence: 99%

“…The main adsorbent used for dye removal is activated carbon, but, the use of cheap and eco-friendly materials have been studied as alternative (Ali, 2012;Ali et al, 2012). Recently, tannery solid wastes (TSWs) were successfully employed for dyes adsorption, providing some advantages, for example, the reuse of treated water in leather industry and an extended survival of such waste before reaching its final destination (Piccin et al, 2012(Piccin et al, , 2013. Moreover, the reduction in color, applying TSW to treat colored tannery wastewater, is able to reduce significantly the presence of organic and inorganic pollutants in wastewater, as well as, toxicity.…”

Section: Introductionmentioning

confidence: 99%

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Mass transfer models for the adsorption of Acid Red 357 and Acid Black 210 by tannery solid wastes

Piccin

Guterres

Salau

et al. 2016

Adsorption Science & Technology

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Diffusional mass transfer models with and without external resistance were applied to represent the adsorption of Acid Red 357 (AR357) and Acid Black 210 (AB210) by tannery solid wastes. The mass transfer parameters, such as, external mass transfer coefficient (k f ), surface diffusion coefficient (D s ), and Biot number (B i ) were estimated and interpreted. It was found that the two models agreed with the experimental data and, very similar values of the parameters were obtained. This indicated that the external mass transfer mechanism can be neglected. Then, the model without external resistance, which is simpler, can be used. The D s values ranged from 5.01 Â 10 À13 to 1.30 Â 10 À12 m 2 s À1 for AR357 and from 3.19 Â 10 À14 to 5.38 Â 10 À14 m 2 s À1 for AB210. The high values of the B i number confirmed that the adsorption of AR357 and AB210 on tannery solid wastes was controlled by surface diffusion.

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Kinetics and isotherms of leather dye adsorption by tannery solid waste

Cited by 163 publications

References 40 publications

Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

Synthesis of carrageenan/multi-walled carbon nanotube hybrid hydrogel nanocomposite for adsorption of crystal violet from aqueous solution

Adsorption of Ni(II) onto Chemically Modified Spent Grated Coconut (Cocos Nucifera)

Mass transfer models for the adsorption of Acid Red 357 and Acid Black 210 by tannery solid wastes

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