Removal of chromium (VI) from aqueous solution using Eggshell/ poly pyrrole composite

Ehsanpour, Saied; Samani, Majid Riahi; Davood, Toghraie

doi:10.1016/j.aej.2022.09.018

Cited by 23 publications

(8 citation statements)

References 52 publications

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“…Freundlich model illustrates the distribution of active centers on a heterogeneous surface for the multilayer adsorption and explained by the subsequent equation [22]: where 1/n represents the adsorption intensity and K F is Freundlich constant expressing the adsorption capacity.…”

Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Fabrication, Characterization and Adsorption Investigation of Nano Zinc Oxide–Sodium Alginate Beads for Effective Removal of Chromium (VI) from Aqueous Solution

Hezma

Shaltout

Kabary

et al. 2023

J Inorg Organomet Polym

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Alginate–zinc oxide (Alg–ZnO) biocomposite was synthesized and tested as a chromium ions Cr(VI) adsorbent for environmental applications. Alg–ZnO biocomposite was prepared by the interaction between sodium alginate biopolymer and zinc oxide nanoparticles (ZnO–NPs), prepared by modified wet chemical method. The solid adsorption characteristics of the synthesized Alg–ZnO biocomposite were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV–Vis spectroscopy. Adsorption isotherms of chromium ions on the prepared Alg–ZnO biocomposite were investigated with varying the initial concentration of Cr(VI) under different application conditions such as pH, contact time, adsorbent dosage, and temperature. Adsorption of Cr(VI) was investigated by different isotherm models such as Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models. Maximum adsorption capacities (31.09 and 34.63 mg/g) were achieved by ZnO–NPs and Alg–ZnO, respectively at 25 °C. The results of isotherm models indicate the perfect applicability of Langmuir and Dubinin–Radushkevich models, revealing the dominance of monolayer and the physisorption of chromium ions onto the studied adsorbents.

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Section: Adsorption Isotherm Modelsmentioning

confidence: 99%

Fabrication, Characterization and Adsorption Investigation of Nano Zinc Oxide–Sodium Alginate Beads for Effective Removal of Chromium (VI) from Aqueous Solution

Hezma

Shaltout

Kabary

et al. 2023

J Inorg Organomet Polym

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“…Judging from the number of recently published works, adsorption seems to be the technology most widely used to investigate the removal of chromium(VI) from solutions. The investigated adsorbents have included: a carbon dot–chitin nanocrystal hybrid [ 16 ], polystyrene microplastics [ 17 ], CdO nanoparticles formed into grapheme and grapheme oxide nanosheets [ 18 ], fungal biomass [ 19 ], biochar nanocomposites based on CoFeO 4 [ 20 ], activated carbon from oil shale [ 21 ], aerogel composites from chitosan and pineapple-leaf-based cellulose [ 22 ], an eggshell–polypyrrole composite [ 23 ], and activated carbon from guava seeds [ 24 ]. Besides these conventional adsorption methodologies, there is also great interest in investigating the removal of toxic chromium(VI) from solutions via reduction to the less harmful chromium(III) oxidation state.…”

Section: Introductionmentioning

confidence: 99%

Transport of Chromium(VI) across a Supported Liquid Membrane Containing Cyanex 921 or Cyanex 923 Dissolved in Solvesso 100 as Carrier Phase: Estimation of Diffusional Parameters

Robla

2023

Membranes

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An investigation of chromium(VI) transport across a supported liquid membrane containing the phosphine oxides Cyanex 921 and Cyanex 923 dissolved in Solvesso 100 as carrier phases was carried out in batch operation mode. Chromium(VI) transport was investigated as a function of different variables: hydrodynamic conditions in the feed (1000–1600 min−1) and stripping (600–1500 min−1) phases, HCl (0.25–2 M) and indium (0.01–0.1 g/L) concentrations in the feed phase, and carrier (0.01 M–0.75 M) concentration in the membrane phase. Indium was recovered in the stripping phase using hydrazine sulphate solutions, and, at the same time, chromium(VI) was reduced to the less harmful Cr(III) oxidation state. Models describing the transport mechanism comprising a diffusion process through the feed aqueous diffusion layer, fast interfacial chemical reaction, and diffusion of the respective chromium(VI)–phosphine oxide complexes across the membrane were developed. The equations describing the rate of transport correlate the membrane permeability coefficient with diffusion and equilibrium parameters, as well as the chemical compositions of the respective metal–carrier phases. The models were used to calculate diffusional parameters for each metal–carrier system, and the minimum thickness of the feed boundary layer was calculated as 1 × 10−3 cm and 6.3 × 10−4 cm for the Cr(VI)-Cyanex 921 and Cr(VI)-Cyanex 923 systems, respectively.

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“…Besides, it influences the fat, glucose, and cholesterol metabolism of mammals 5 . Cr (VI), on the other hand, presents a toxic potential to living organisms and can easily penetrate the cell wall and exert its noxious influence, being a source of cancer disease 2 . Different industrial activities like chrome tanning plant, electroplating plant, hardware factory, among others, uses high concentration of chromium which may be discarded in wastewater and could present a serious environmental concern 6 .…”

Section: Introductionmentioning

confidence: 99%

“…Treating wastewater to remove toxic metal pollutants is of great concern as these metals threaten people's and animals' health. [1][2][3] Among them, chromium is the seventh most abundant element on earth and is a naturally occurring metal found in the environment commonly in trivalent, Cr (III), and hexavalent, Cr (VI) forms. 4 Cr (III) is nontoxic and has an essential role as a micronutrient in the human diet.…”

Section: Introductionmentioning

confidence: 99%

Bacterial cellulose‐modified castor oil‐based polyurethane sponge for hexavalent chromium removal

Maia,

Pinhati,

Monteceli

et al. 2023

J of Applied Polymer Sci

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Due to the multiple industrial applications of chromium compounds and their dangerous nature for the environment, the development of adsorbent materials has been investigated. In line with this reality, bacterial cellulose (BC) has become a potential filler in the polymeric matrix due to its ability to remove toxic metals; however, its performance is little explored. This research proposes a new approach for BC as a filler in castor oil‐based polyurethane, obtaining a sponge for Cr(VI) removal. The pure PU and PU + X%BC sponges (X stands for BC content between 5 and 20 wt%) were characterized by Fourier‐transform infrared spectroscopy, scanning electron microscopy, optical microscopy, density, contact angle (CA), and thermogravimetric analysis. Sorption capacity and efficiency were evaluated as a function of the fiber content, with tests performed in function of contact time (2.5 min to 3 h) at 50 mg L−1. The BC fillers of the sponges increased the density and influenced the morphological, chemical structural, thermal, and sorption properties. Thus, the sponge (PU + 20%BC) presented the highest CA (104.4°) and the best sorption capacity and efficiency (4.3 mg g−1 and 43.2%). The sorption mechanism was well‐defined by isotherm models, presenting a maximum adsorption capacity of 23.5 mg g−1 and best fit (R2 = 0.989) with the Freundlich isotherm. The sponge is an efficient material for Cr (VI) removal and provided a promising insight into an adsorption mechanism study.

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Removal of chromium (VI) from aqueous solution using Eggshell/ poly pyrrole composite

Cited by 23 publications

References 52 publications

Fabrication, Characterization and Adsorption Investigation of Nano Zinc Oxide–Sodium Alginate Beads for Effective Removal of Chromium (VI) from Aqueous Solution

Fabrication, Characterization and Adsorption Investigation of Nano Zinc Oxide–Sodium Alginate Beads for Effective Removal of Chromium (VI) from Aqueous Solution

Transport of Chromium(VI) across a Supported Liquid Membrane Containing Cyanex 921 or Cyanex 923 Dissolved in Solvesso 100 as Carrier Phase: Estimation of Diffusional Parameters

Bacterial cellulose‐modified castor oil‐based polyurethane sponge for hexavalent chromium removal

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