Adsorption, equilibrium isotherm, and thermodynamic studies to the removal of acid orange 7

Zaheer, Zoya; Bawazir, Wafa A.; Albukhari, Soha M.; Basaleh, Amal S.

doi:10.1016/j.matchemphys.2019.04.064

Cited by 61 publications

(30 citation statements)

References 63 publications

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“…It was found that the removal efficiency of AO7 dye and Cr(VI) by MS-450 and MWC-700 decreased from 98 to 78% and from 90 to 70%, respectively, after the fifth cycle. In another study, Zaheer et al ( 2019 ) used 0.05 M NaOH for the desorption of AO7 from zero-valent iron nanoparticles (ZvFeNPs). In agreement to the finding of this study, NaOH desorbed AO7 from ZvFeNPs efficiently and the removal efficiency decreased to 82% after five cycles.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Santhosh

Daneshvar

Tripathi

et al. 2020

Environ Sci Pollut Res

130

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In this study, different types of magnetic biochar nanocomposites were synthesized using the co-precipitation method. Two biochar materials, namely, sewage sludge biochar and woodchips biochar, were prepared at two different temperatures, viz., 450 and 700 °C. These biochars were further modified with magnetic nanoparticles (Fe 3 O 4 ). The modified biochar nanocomposites were characterized using field emission–scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET), SQUID analysis, X-ray photoelectron spectroscopy (XPS), and Fourier-transform infrared spectroscopy (FTIR). The potential of prepared adsorbents was examined for the removal of hexavalent chromium (Cr(VI)) and Acid orange 7 (AO7) dye from water as a function of various parameters, namely, contact time, pH of solution, amount of adsorbents, and initial concentrations of adsorbates. Various kinetic and isotherm models were tested to discuss and interpret the adsorption mechanisms. The maximum adsorption capacities of modified biochars were found as 80.96 and 110.27 mg g -1 for Cr(VI) and AO7, respectively. Magnetic biochars showed high pollutant removal efficiency after 5 cycles of adsorption/desorption. The results of this study revealed that the prepared adsorbents can be successfully used for multiple cycles to remove Cr(VI) and AO7 from water. Graphical Abstract Electronic supplementary material The online version of this article (10.1007/s11356-020-09275-1) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Santhosh

Daneshvar

Tripathi

et al. 2020

Environ Sci Pollut Res

130

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“…Conversely, R 2 values of second-order kinetic model are above 0.987 with the SD in the range of 0.022-0.043. Thus, best results are achieved by using pseudo-second-order model, as found for anionic dyes [45,[55][56][57][58]. Furthermore, the rate constant of adsorption (k 2 ) is superior to 0.0133 g•mg −1 •min −1 with Fe/FeC holding the highest k 2 values due to the rapid dye adsorption and removal.…”

Section: Pseudo-first and Second Order Modelsmentioning

confidence: 94%

“…For the Langmuir isotherm model, the adsorption occurs at a specific uniform location within the adsorbent and a monolayer is formed on the solid surface, as indicated in the literature [12,45].…”

Section: Equilibrium Studymentioning

confidence: 99%

“…The mechanisms and rate controlling steps the kinetics of adsorption is investigated through the intraparticle diffusion model from data (Figure 9b). The model proposes that a surface diffusion mechanism governs adsorption, in a first stage while the pore diffusion mechanism may occur in second stage, according to the following Equation (10) [45,56]:…”

Section: Intra-particle Diffusionmentioning

confidence: 99%

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Acid Red 66 Dye Removal from Aqueous Solution by Fe/C-based Composites: Adsorption, Kinetics and Thermodynamic Studies

et al. 2020

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The presence of synthetic dyes in water causes serious environmental issues owing to the low water quality, toxicity to environment and human carcinogenic effects. Adsorption has emerged as simple and environmental benign processes for wastewater treatment. This work reports the use of porous Fe-based composites as adsorbents for Acid Red 66 dye removal in an aqueous solution. The porous FeC and Fe/FeC solids were prepared by hydrothermal methods using iron sulfates and sucrose as precursors. The physicochemical properties of the solids were evaluated through X-ray diffraction (XRD), Scanning electron microscopy coupled with Energy dispersive spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared s (FTIR), Raman and Mössbauer spectroscopies, nitrogen adsorption–desorption isotherms, Electron Paramagnetic Resonance (EPR) and magnetic saturation techniques. Results indicated that the Fe species holds magnetic properties and formed well dispersed Fe3O4 nanoparticles on a carbon layer in FeC nanocomposite. Adding iron to the previous solid resulted in the formation of γ-Fe2O3 coating on the FeC type structure as in Fe/FeC composite. The highest dye adsorption capacity was 15.5 mg·g−1 for FeC nanocomposite at 25 °C with the isotherms fitting well with the Langmuir model. The removal efficiency of 98.4% was obtained with a pristine Fe sample under similar experimental conditions.

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“…Eadie-Hofstee (linearized Langmuir type III) (Zaheer, Bawazir, Al-Bukhari, & Basaleh, 2019).where q m and K L are Langmuir constants.…”

Section: Modeling Approachesmentioning

confidence: 99%

Phosphate removal from water using alginate/carboxymethylcellulose/aluminum beads and plaster of paris

Malicevic

Pacheco

Lamont

et al. 2020

Water Environment Research

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Phosphorus released in lakes due to agricultural water runoff causes eutrophication, deteriorating water quality and harming ecosystems. Two adsorbents were studied for the removal of phosphate from water: plaster of Paris powder and hydrogel beads produced using alginate, carboxymethylcellulose, and aluminum. The reaction kinetics, adsorption capacity, and ability to desorb were compared. Sorption of phosphate with either plaster of Paris or hydrogel beads was well described by the Langmuir model. In deionized water, hydrogel beads had a maximum sorption capacity of 90.5 mg PO43- /g dry bead with an equilibration time of approximately 24 hr. Monovalent anions (e.g., chloride) did not affect phosphorus sorption onto hydrogel beads, whereas divalent anions (e.g., sulfate) hindered sorption. In deionized water, plaster of Paris (POP) powder has a maximum capacity of 1.52 mg PO43- /g with an equilibrium time of less than 10 min. Sorbents can potentially be reused following phosphate desorption, and desorbed phosphate may be reused as fertilizer. At pH = 9.5, hydrogel beads desorbed up to 60% of the original amount of phosphate sorbed and lower amounts at lower pH. At pH = 2, POP powder desorbed only 35% of the initial phosphate sorbed, and desorption decreased with increasing pH. Practitioner points The maximum sorption capacity of plaster of Paris is 1.52 mg PO43- /g. The maximum sorption capacity of hydrogel beads is 90.5 mg PO43- /g. Monovalent anions do not affect phosphorus sorption, and divalent anions hinder it by ≈36%. Sorption is well described by Langmuir isotherms (R2 > 0.98). Hydrogel beads desorb 60% of phosphorus at pH = 9, possibly allowing phosphorus reuse.

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Adsorption, equilibrium isotherm, and thermodynamic studies to the removal of acid orange 7

Cited by 61 publications

References 63 publications

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Synthesis and characterization of magnetic biochar adsorbents for the removal of Cr(VI) and Acid orange 7 dye from aqueous solution

Acid Red 66 Dye Removal from Aqueous Solution by Fe/C-based Composites: Adsorption, Kinetics and Thermodynamic Studies

Phosphate removal from water using alginate/carboxymethylcellulose/aluminum beads and plaster of paris

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