Thermodynamic studies of adsorption of rhodamine B and Congo red on graphene oxide

Sahar, Juma; Akhtar, Naeem; Farooq, Muhammad; Zareen, Shah; Rahman, Abdur

doi:10.5004/dwt.2019.24436

Cited by 34 publications

(13 citation statements)

References 52 publications

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“…7). 75,76 The major changes of the chemical functionalities on GO after adsorption of dyes and antibiotics were observed in the wavenumber range of 1750 to 500 cm −1 in the ATR-FTIR spectra. The vibrations at 1387 cm −1 and 1119 cm −1 on GO attributed to the C–O and C–OH groups respectively were diminished and new peaks appeared at 1738 cm −1 and 1588–1594 cm −1 owing to CO and CC respectively after adsorption of dyes (Fig.…”

Section: Resultsmentioning

confidence: 99%

Wastewater depollution of textile dyes and antibiotics using unmodified and copper oxide/zinc oxide nanofunctionalised graphene oxide materials

Rajapaksha

Orrell-Trigg

Truong

et al. 2022

Environ. Sci.: Adv.

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Section: Resultsmentioning

confidence: 99%

Wastewater depollution of textile dyes and antibiotics using unmodified and copper oxide/zinc oxide nanofunctionalised graphene oxide materials

Rajapaksha

Orrell-Trigg

Truong

et al. 2022

Environ. Sci.: Adv.

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“…The pH of solution has a crucial effect on adsorption capacity of dyes. The change in the pH of a solution can modify the surface charge of the adsorbent and degree of ionization of the dye. , The effect of pH on the adsorption capacity was investigated by varying pH from 4 to 10. Figure b describes the influence of pH on the adsorption capacity of MO.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Methyl Orange from an Aqueous Solution onto a BPPO-Based Anion Exchange Membrane

et al. 2022

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In this research, the development of a novel brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO)-based homogeneous anion exchange membrane (AEM) via the solution casting method was reported. Fourier transform infrared spectroscopy was used to confirm the successful development of the BPPO-based AEM. The prepared AEM showed excellent thermal stability. It exhibited an ion exchange capacity of 2.66 mg/g, a water uptake ( W R ) of 68%, and a linear swelling ratio of 31%. Methyl orange (MO), an anionic dye, was used as a model pollutant to evaluate the ion exchange ability of the membrane. The adsorption capacity of MO increased with the increase in contact time, membrane dosage (adsorbent), temperature, and pH while declined with the increase in initial concentration of MO in an aqueous solution and molarity of NaCl. Adsorption isotherm study showed that adsorption of MO was fitted well to the Freundlich adsorption isotherm because the value of the correlation coefficient ( R 2 = 0.974) was close to unity. Adsorption kinetics study showed that adsorption of MO fitted well to the pseudo-second-order kinetic model. Adsorption thermodynamics evaluation represented that adsorption of MO was an endothermic (Δ H ° = 18.72 kJ/mol) and spontaneous process. The AEM presented a maximum adsorption capacity of 18 mg/g. Moreover, the regeneration of the prepared membrane confirmed its ability to be utilized for three consecutive cycles. The developed BPPO-based AEM was an outstanding candidate for adsorption of MO from an aqueous solution.

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“…Adsorption isotherms of UiO-67, CNTs, and UiO-67@CNTs at pH 7 at 25 °C are displayed in Figure 7. Due to sensitivity of anionic CR towards the acids and bases, the color of CR solution changes from red to dark blue at low pH, and it becomes reddish in basic pH of up to 10 (Purkait et al 2007;Sahara et al 2019;Dat et al 2022). Therefore, pH ¼ 7 is selected in this study because anionic CR solution remains stable and no change in the color is observed at this pH value.…”

Section: Performances Evaluation Of Cr Capturementioning

confidence: 99%

Well-design and synthesis of a water- and heat-resistant UiO-67@CNTs composite for Congo red efficient capture

Jin

et al. 2022

Water Science and Technology

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MOFs (metal-organic frameworks) significantly suffer from water- and heat instable issues, restricting their practical application, such as the capture of hazardous anionic dyes (e.g. Congo red, CR) from water. In present contribution, a series of novel composites (UiO-67@CNTs) composed of microporous UiO-67 (Zr6O4(OH)4(CO2)12) and mesoporous CNTs (carbon nanotubes) have been innovatively synthesized by an in-situ hydrothermal reaction strategy. This UiO-67@CNT impressively retains structural integrity whether contacted with strong acid, distilled water, and strong alkali conditions even for 20 days. Due to existence of CNT, its heat stability can reach up to 480 °C, which is superior to that of UiO-67. Open Zr(IV) sites, mesoporous, and high surface area in the structure of UiO-67@CNTs play associative effects for CR capture ability. CR uptakes over (5.0)UiO-67@CNTs can reach 1,024 mg/g, exceeding some other previous adsorbents in literature. Importantly, UiO-67@CNTs could retain a remarkable CR capture ability even after the fifth cycle. This work expands views for water-heat resistant MOF-based composite with excellent ability of CR capture.

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Thermodynamic studies of adsorption of rhodamine B and Congo red on graphene oxide

Cited by 34 publications

References 52 publications

Wastewater depollution of textile dyes and antibiotics using unmodified and copper oxide/zinc oxide nanofunctionalised graphene oxide materials

Wastewater depollution of textile dyes and antibiotics using unmodified and copper oxide/zinc oxide nanofunctionalised graphene oxide materials

Adsorption of Methyl Orange from an Aqueous Solution onto a BPPO-Based Anion Exchange Membrane

Well-design and synthesis of a water- and heat-resistant UiO-67@CNTs composite for Congo red efficient capture

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