Biosorption of Cr6+ from aqueous solution by sugarcane bagasse

Alomá, Inés de la C.; Rodriguez, I.; Calero, M.; Blázquez, G.

doi:10.1080/19443994.2013.812521

Cited by 30 publications

(2 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e maximum adsorption capacity calculated from Langmuir and Sips models was 10.69 and 10.82 mg/g at 20°C, respectively, very close to the equilibrium experimental value of 8.81 mg/g, which also confirmed the good agreement between the obtained experimental data and the Sips model. Similar findings have been reported for Cr(VI) adsorption onto different biomasses such as maize corncob [35], sugarcane bagasse [36], and Swietenia mahagoni [37].…”

Section: Effect Of Initial Cr(vi) Concentration and Adsorptionsupporting

confidence: 88%

Adsorption of Chromium(VI) onto Freshwater Snail Shell-Derived Biosorbent from Aqueous Solutions: Equilibrium, Kinetics, and Thermodynamics

Nguyen

Van

et al. 2019

Journal of Chemistry

View full text Add to dashboard Cite

In this study, freshwater snail shells (FSSs) containing CaCO3 were used as a low-cost biosorbent for removing Cr(VI) from aqueous solutions. The characteristics of FSS and mechanism of Cr(VI) adsorption onto FSS were investigated. The FSS biosorbent was characterized using nitrogen adsorption/desorption isotherm, X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy, and Fourier transform infrared spectroscopy. The adsorption mechanism was determined by conducting various batch adsorption experiments along with fitting experimental data with various adsorption models. Batch adsorption experiments were conducted as a function of solution pH, contact time, biosorbent dose, and initial Cr(VI) concentration. Results indicated that pH = 2, a contact time of 120 min, and an initial Cr(VI) concentration of 30 mg/L at 20°C were the best conditions for adsorption of Cr(VI) onto FSS. The Cr(VI) adsorption onto FSS decreased with an increase in temperature from 20 to 40°C. The obtained maximum adsorption capacity was 8.85 mg/g for 2 g/L of FSS dose with 30 mg/L of initial Cr(VI) at 20°C. The adsorption equilibrium data fit well with the Sips and Langmuir isotherm models at 20°C with a high R2 of 0.981 and 0.975, respectively. Also, a good correlation between the experimental data and the pseudo-second-order model was achieved, with the highest R2 of 0.995 at 20°C. The adsorption mechanisms were electrostatic interaction and ion exchange. Simultaneously, this mechanism was also controlled by film diffusion. The Cr(VI) adsorption process was irreversible, spontaneous (−∆G°), exothermic (∆H° is negative), and less random (∆S° is negative). In conclusion, freshwater snail shells have the potential as a renewable adsorbent to remove toxic metals from wastewater.

show abstract

Section: Effect Of Initial Cr(vi) Concentration and Adsorptionsupporting

confidence: 88%

Adsorption of Chromium(VI) onto Freshwater Snail Shell-Derived Biosorbent from Aqueous Solutions: Equilibrium, Kinetics, and Thermodynamics

Nguyen

Van

et al. 2019

Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…The maximum adsorption capacities of Cr(VI), As(V), As(III) and F were found to be 166.7, 83.3, 32.3 and 2.5 mg g À1 , respectively. The adsorption capacity obtained for Cr(VI) is higher than those for other reported biosorbents like magnetic chitosan hydrogel (144.9 mg g À1 ), 17 2013), sugarcane bagasse (5.09 mg g À1 ), 39 magnetic particles (Fe 3 O 4 ) immobilized onto PEI/acrylate beads (109.2 mg g À1 ), 40 alginate (42.6 mg g À1 ), 41 activated carbon and Bacillus subtilis (19.43 mg g À1 ). 42 In the case of arsenic species, it is observed Scheme 2 Schematic representation of the mechanism of interaction of crosslinked CPF with As(III), As(V), Cr(VI) and F. that the adsorption capacity of CPF towards As(V) was 2.6 times higher than that towards As(III).…”

Section: Adsorption Experimentsmentioning

confidence: 62%