Adsorption and removal of chromium (VI) contained in aqueous solutions using a chitosan-based hydrogel

Vilela, Pâmela Becalli; Dalalibera, Amanda; Duminelli, Eduardo Costa; Becegato, Valter Antônio; Paulino, Alexandre Tadeu

doi:10.1007/s11356-018-3208-3

Cited by 113 publications

(42 citation statements)

References 33 publications

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“…And the non‐linear Redlich‐Peterson isotherm can be used to describe the adsorption process of NH 2 ‐ZIF‐8 towards Ag(I) with lower chi‐square test statistic (χ 2 ), indicating the adsorption process was governed by multi‐site interaction and monolayer. Besides, the βs value of non‐linear Redlich‐Peterson isotherm model is much bigger than 1, suggesting the adsorption process is not exclusively governed by the Langmuir isotherm …”

Section: Resultsmentioning

confidence: 99%

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Zhou

et al. 2020

Applied Organom Chemis

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In this paper, zeolitic imidazolate framework‐8 modified by the ethanediamine (NH2‐ZIF‐8) was employed for adsorbing Au (III) and Ag(I) from aqueous solutions. The adsorption capacities of NH2‐ZIF‐8 towards Au (III) and Ag(I) were found to be significantly affected by the pH values of the solution. The adsorption kinetics studies show that NH2‐ZIF‐8 presents a fast adsorption property towards metals, attaining 93% of adsorption equilibrium uptake for Au (III) within the first 30 min. This phenomenon can be ascribed to the coordination interaction between the amino group and Au (III). The thermodynamic data suggest that the adsorption of NH2‐ZIF‐8 towards Au (III) is endothermic process, while that for Ag(I) is exothermic. The maximum adsorption capacities of NH2‐ZIF‐8 toward Au (III) and Ag(I) can be achieved to 357 mg·g−1 and 222.25 mg·g−1, respectively. The metal ions interference results show that Cu (II) and Ni (II) hardly have no interference on Au (III) adsorption in e‐waste containing 1500 mg·l−1 Cu (II),100 mg·l−1 Ni (II) and 10 mg·l−1 Au (III); while for Ag(I), Cd (II) and Zn (II) have little interference on Ag(I) adsorption in the hybrid solutions containing Ag(I), Ni (II), Cd (II) and Zn (II) with equal concentration (50 mg·l−1), but Ni (II) interference most. The XPS study shows that partial Au (III) was reduced to Au(I), and that Ag(I) was completely reduced to Ag(0) during the adsorption process. The abundant of active sites of NH2‐ZIF‐8 containing C=N, N‐H, and Zn‐OH groups play a key role in the adsorption of Au (III) and Ag(I). In addition, electrostatic interaction can be responsible for the adsorption of Au (III) by NH2‐ZIF‐8. The regeneration experiments results show that the adsorption capacities of NH2‐ZIF‐8 towards Au (III) and Ag(I) can maintain after three cycles. This work provides a reliable method to improve the adsorption kinetics for metal ions.

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Section: Resultsmentioning

confidence: 99%

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Zhou

et al. 2020

Applied Organom Chemis

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“…Water pollution has become a global issue because of its increasing impact on human and animal health. The presence of heavy metals in industrial water is not only causing severe damage to human and animal health, but it is also damaging aquatic life [1][2][3]. The effluents from a variety of industrial processes such as metallurgy, petroleum refining, batteries, and electroplating are responsible for introducing these heavy metals into aquatic environments [4,5].…”

Section: Introductionmentioning

confidence: 99%

Activated Carbon Microsphere from Sodium Lignosulfonate for Cr(VI) Adsorption Evaluation in Wastewater Treatment

Yang

Xing

et al. 2020

Polymers

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In this study, activated carbon microsphere (SLACM) was prepared from powdered sodium lignosulfonate (SL) and polystyrene by the Mannich reaction and ZnCl2 activation, which can be used to remove Cr(VI) from the aqueous solution without adding any binder. The SLACM was characterized and the batch experiments were conducted under different initial pH values, initial concentrations, contact time durations and temperatures to investigate the adsorption performance of Cr(VI) onto SLACM. The results indicated that the SLACM surface area and average pore size were 769.37 m2/g and 2.46 nm (the mesoporous material), respectively. It was found that the reduced initial pH value, the increased temperature and initial Cr(VI) concentration were beneficial to Cr(VI) adsorption. The maximum adsorption capacity of Cr(VI) on SLACM was 227.7 mg/g at an initial pH value of 2 and the temperature of 40 °C. The adsorption of SLACM for Cr(VI) mainly occurred during the initial stages of the adsorption process. The adsorption kinetic and isotherm experimental data were thoroughly described by Elovich and Langmuir models, respectively. SL could be considered as a potential raw material for the production of activated carbon, which had a considerable potential for the Cr(VI) removal from wastewater.

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“…The Freundlich isotherm model presumes that adsorption happens at multilayers and various adsorbent sites have different energies. Equations (7) and (8) show the Freundlich isotherm model and its linear form:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…ln q e = ln K F + 1 n ln C e (8) where the n and K F (mg/g) are Freundlich constants related to the adsorption intensity and adsorption capacity, respectively. Figure 14a,b presents Langmuir and Freundlich linear fittings, respectively, whereas the isotherm constants are presented in Table 2.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Due to Pb(II)'s high toxicity, the United States Environmental Protection Agency (USEPA) has set a very low tolerance limit of Pb(II) (0.015 mg/L) for drinking water [4]. Various techniques are used for the removal of heavy metals from water and wastewater, including chemical sedimentation [5], ion exchange [6], membrane [7], and adsorption [8][9][10][11]. Among them, adsorption is appealing owing to its simple application, low cost, and remarkable efficiency.…”

Section: Introductionmentioning

confidence: 99%

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Uptake of Pb(II) Ions from Simulated Aqueous Solution via Nanochitosan

et al. 2019

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In this work, nanochitosan (NC) was prepared through ionic gelation using low molecular weight chitosan and maleic acid (MA). The synthesized NC was characterized by atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). During preparation, the particle size of the material depended on parameters such as concentration of chitosan and pH of the aqueous solution. After controlling the mentioned parameters, NC smaller than 100 nm was prepared. The chitosan and prepared NC were employed for the adsorption of Pb(II) from an aqueous solution in the form of a batch system. Among the sorption parameters, pH showed the strongest effect on the sorption process and removal of the maximum number of Pb(II) ions was obtained at pH value of 6. Pseudo-first-order and pseudo-second-order models were used to track the kinetics of the adsorption process. Langmuir and Freundlich’s isotherms were subjected to the absorption data to evaluate absorption capacity. NC proved to be an excellent adsorbent with a remarkable capacity to eliminate Pb(II) ions from aqueous solutions at multiple concentrations. The NC also showed better performance with a comparatively easier preparation process than in other reported work.

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Adsorption and removal of chromium (VI) contained in aqueous solutions using a chitosan-based hydrogel

Cited by 113 publications

References 33 publications

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Fast recovery of Au (III) and Ag(I) via amine‐modified zeolitic imidazolate framework‐8

Activated Carbon Microsphere from Sodium Lignosulfonate for Cr(VI) Adsorption Evaluation in Wastewater Treatment

Uptake of Pb(II) Ions from Simulated Aqueous Solution via Nanochitosan

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