Effective removal of hexavalent chromium from aqueous solutions by adsorption on mesoporous carbon microspheres

Zhou, Jieyu; Wang, Yuefeng; Wang, Jitong; Qiao, Wenming; Long, Donghui; Ling, Licheng

doi:10.1016/j.jcis.2015.10.001

Cited by 141 publications

(66 citation statements)

References 33 publications

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“…In this study, the applicability of the pseudo-first-order model (Equation (7)) and pseudo-second-order model (Equation (8)) have been tested for the sorption of Cr(VI) onto modified activated carbons [38]. The best-fit model was selected based on the linear regression correlation coefficient, R 2 values.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Zhou

Wang

Hursthouse

et al. 2018

Water

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Gemini surfactants, with double hydrophilic and hydrophobic groups, offer potentially orders of magnitude greater surface activity compared to similar single unit molecules. A cationic Gemini surfactant (Propyl didodecyldimethylammonium Bromide, PDDDAB) and a conventional cationic surfactant (Dodecyltrimethylammonium Bromide, DTAB) were used to pre-treat and generate activated carbon. The removal efficiency of the surfactant-modified activated carbon through adsorption of chromium(VI) was investigated under controlled laboratory conditions. Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to investigate the surface changes of surfactant-modified activated carbon. The effect of important parameters such as adsorbent dosage, pH, ionic strength and contact time were also investigated. The chromium(VI) was adsorbed more significantly on the Gemini surfactant-modified activated carbon than on the conventional surfactant-modified activated carbon. The correlation coefficients show the data best fit the Freundlich model, which confirms the monolayer adsorption of chromium(VI) onto Gemini surfactant-modified activated carbon. From this assessment, the surfactant-modified (especially Gemini surfactant-modified) activated carbon in this study showed promise for practical applications to treat water pollution.

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Section: Adsorption Kineticsmentioning

confidence: 99%

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Zhou

Wang

Hursthouse

et al. 2018

Water

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“…The maximum sorption capacity (q max ) of ILrGO for Cr(VI) was calculated by the Langmuir isotherm model and compared to the other sorbents 51,[66][67][68][69] with high capacity used for this purpose (Table 4). It is clear that IL-rGO has the advantages of higher sorption capacity.…”

Section: Performance Evaluationmentioning

confidence: 99%

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent

Nasrollahpour¹

2017

Chem.Biochem.Eng.Q.

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Ionic liquid modified reduced graphene oxide (IL-rGO) was prepared and examined for chromate removal. The sorbent was characterized by N 2 adsorption-desorption measurement (BET), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. The sorption behavior of chromate on the ionic liquid modified reduced graphene oxide sorbent from an aqueous medium was studied by varying the parameters such as contact time, initial chromate concentration, pH, and agitation speed. The results showed that sorption kinetics of chromate by IL-rGO follows the pseudo second order, which indicates that the sorption mechanism is both chemical and physical interaction. The sorption isotherm studies revealed that Langmuir model provided the best fit to all the experimental data with an adsorption capacity of 232.55 mg g -1 for IL-rGO. Thermodynamic parameters, such as Gibbs free energy (-2.85 kJ mol -1 at 298 K), enthalpy (55.41 kJ mol -1 ), and entropy (11.64 J mol -1 K -1 ) of sorption of the chromate on ionic liquid modified reduced graphene oxide was evaluated, and it was found that the reaction was spontaneous and endothermic in nature.

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“…Mesoporous carbon microspheres (MCMs) possessed excellent adsorption capacity for Cr at as high as 165.3 mg/L, while Fe3O4-loaded MCMs was at 156.3 mg/L. What is more, Fe3O4-loaded MCMs had a good regeneration ability with a capacity of 123.9 mg/L for the fifth adsorption-desorption cycle [30] .…”

Section: Adsorptionmentioning

confidence: 99%

Physio-chemical treatment technologies for chromium removal

Zhang¹,

Li²

2017

Proceedings of the 2016 4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016)

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Abstract. The article reviews the technical applicability of various physio-chemical treatments for the removal of hexavalent chromium (Cr(VI)) from aqueous solution. A particular focus is given to membrane electrolysis, photocatalytic reduction, adsorption and the application of nanotechnology in Cr(VI) removal. About 50 published studies (2011)(2012)(2013)(2014)(2015)(2016)(2017) are reviewed. Liquid membrane and electrodialysis were combined. Metal-organic frameworks (MOFs) emerged to enhance photocatalytic reduction. It is evident that adsorption is the most frequently studied and widely applied for the treatment of Cr(VI). And nanotechnology is mainly applied to nanoadsorbent which exhibited both reduction and adsorption capabilities. In general, further researches on methods with cost-effectiveness, technical-applicability, and plant-simplicity are vital for heavy metal removal such as chromium.

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Effective removal of hexavalent chromium from aqueous solutions by adsorption on mesoporous carbon microspheres

Cited by 141 publications

References 33 publications

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent

Physio-chemical treatment technologies for chromium removal

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