Biosorption of Organic Dyes: Research Opportunities and Challenges

Dotto, Guilherme L.; Sharma, Sanjay K.; Pinto, Luiz Antônio de Almeida

doi:10.1002/9781118721001.ch8

Cited by 22 publications

(14 citation statements)

References 136 publications

(302 reference statements)

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“…e stirring speed is an important parameter in the adsorption process since it influences the distribution of the solute in the bulk solution and the formation of the external boundary film [28]. e effect of the stirring speed on the removal of Cr(VI) onto organobentonite evaluated for a contact time of 1 h is shown in Figure 4.…”

Section: Effect Of Stirring Speedmentioning

confidence: 99%

“…e removal of Cr (VI) was not positively correlated with the stirring speed between 200 and 300 rpm because the contact time of 1 h guaranteed equilibrium time conditions in the adsorption tests. It has been established that the stirring speed affects the equilibrium time, but the equilibrium adsorption capacity is not a function of the stirring speed [28]. e stirring speed increase causes an increase in the Reynolds number, in the energy dissipation, and in the turbulence in the mixing zone.…”

Section: Effect Of Stirring Speedmentioning

confidence: 99%

“…e contact time is one of the most important parameters for the industrial application of an adsorbent. A good adsorbent should not only provide high adsorption capacities, but also produce a fast process [28]. e influence of contact time on the Cr(VI) adsorption on organobentonite is shown in Figure 6.…”

Section: Effect Of Contact Timementioning

confidence: 99%

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Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

Castro-Castro

Macías-Quiroga

Giraldo-Gómez

et al. 2020

The Scientific World Journal

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Clay minerals can be modified organically by a cationic surfactant resulting in materials known as organoclays. The organoclays have been used as adsorbents of most of the organic contaminants in the aqueous solution and oxyanions of the heavy metal. In this study, a Colombian bentonite was modified with hexadecyltrimethylammonium bromide to obtain an organobentonite, and its capacity to adsorb Cr(VI) oxyanions in the aqueous solution was evaluated. The effect of pH, stirring speed, adsorbent amount, contact time, and ionic strength were investigated at 25°C. Stirring speeds above 200 rpm, contact times greater than 120 min, and the addition of NaCl (0.1 to 2.0 mM) did not have a significant effect on Cr(VI) removal. The influence of the adsorbent amount and pH on Cr(VI) adsorption was studied by the response surface methodology (RSM) approach based on a complete factorial design 32. Results proved that the Cr(VI) adsorption follows a quadratic model with high values of coefficient of determination (R2 = 95.1% and adjusted R2 = 93.9%). The optimal conditions for removal of Cr(VI) from an aqueous solution of 50 mg/L were pH of 3.4 and 0.44 g amount of the adsorbent. The adsorption isotherm data were fitted to the Langmuir and Freundlich adsorption isotherm models, and the model parameters were evaluated. The maximum adsorption capacity of Cr(VI) onto organobentonite calculated from the Langmuir model equation was 10.04 ± 0.34 mg/g at 25°C. The results suggest that organobentonite is an effective adsorbent for Cr(VI) removal, with the advantage of being a low-cost material.

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Section: Effect Of Stirring Speedmentioning

confidence: 99%

Section: Effect Of Stirring Speedmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

Castro-Castro

Macías-Quiroga

Giraldo-Gómez

et al. 2020

The Scientific World Journal

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“…Many biosorbents have been used for dyes removal from colored effluents. [4][5][6] Special attention can be given to chitosan 7 and Spirulina. 8 Chitosan is a biopolymer obtained from chitin deacetylation, which is classified as one of the most abundant polysaccharide in nature.…”

Section: Introductionmentioning

confidence: 99%

Development of chitosan/Spirulina bio‐blend films and its biosorption potential for dyes

Silva

Farias

Gründmann

et al. 2016

J of Applied Polymer Sci

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Chitosan/Spirulina bio‐blends (CSBB) in films form were developed to be an alternative/renewable biosorbent, able to remove anionic and cationic dyes from aqueous solutions. CSBB potential as biosorbent was investigated for cationic dye Methylene Blue (MB), and anionic dyes Tartrazine Yellow (TY) and Reactive Black 5 (RB5). Chitosan and Spirulina samples were obtained and characterized, and CSBB films were prepared with different chitosan/Spirulina ratios. The CSBB films characteristics, as, mechanical properties, thermal profile, crystallinity, functional groups, morphology, and biosorption potential were strongly dependent of chitosan/Spirulina ratio. CSBB films preserved its mechanical structures at pH from 4.0 to 8.0. The biosorption capacities were 120, 110, and 100 mg g−1 for RB5, TY, and MB, respectively. The increase of chitosan amount favored the TY and RB5 biosorption; however, the increase of Spirulina amount favored the MB biosorption. Thus, the CSBB in film form is a renewable biosorbent suitable to remove anionic and cationic dyes from aqueous solutions. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44580.

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“…Dye-containing effluents from several industries are responsible for various environmental problems, due the high toxicity and carcinogenic aspects (Dotto et al, 2015c). Particularly, the synthetic xanthene dye, Rhodamine B (RhB) (which is carcinogenic), is widely used for paper printing, textile, leather dyeing, photographic and paint industries (Guo et al, 2011;Santhi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

Zimmermann

Dotto

Kuhn

et al. 2016

IJETM

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Abstract:The potential of a Brazilian natural bentonite to remove Rhodamine B (RhB) dye from aqueous solutions was evaluated. The bentonite was characterised by X-ray diffraction, thermogravimetric analysis, particle size distribution and N 2 -adsorption isotherms. The adsorption of RhB onto bentonite was evaluated in batch system. The pH effect (2.5-10.5), kinetic curves and equilibrium isotherms (initial dye concentrations from 100 to 600 mg L -1 ) were studied at 25°C and 250 rpm. It was found that the Brazilian bentonite presented a mesoporous structure with surface area of 14.35 m 2 g -1and average pore size of 28 nm. The adsorption capacity remained practically 2 B.M. Zimmermann et al.constant from pH 2.5 to pH 10.5. The Elovich model was adequate to represent the adsorption kinetic curves. Langmuir and Freundlich models were suitable to represent the adsorption isotherm. The maximum adsorption capacity was 77.3 mg g -1 , obtained at 25°C, pH of 4.5 and adsorbent dosage of 500 mg L -1 . It was demonstrated that the Brazilian bentonite can be utilised as a promising adsorbent to remove RhB from aqueous solutions.

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Biosorption of Organic Dyes: Research Opportunities and Challenges

Cited by 22 publications

References 136 publications

Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

Adsorption of Cr(VI) in Aqueous Solution Using a Surfactant-Modified Bentonite

Development of chitosan/Spirulina bio‐blend films and its biosorption potential for dyes

Adsorption of hazardous dye Rhodamine B onto Brazilian natural bentonite

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