Fabrication of magnetic graphene oxide nanocomposites functionalized with a novel chelating ligand for the removal of Cr(VI): Modeling, optimization, and adsorption studies

Sheikhmohammadi, Amir; Mohseni, Seyed Mohsen; Hashemzadeh, Bayram; Asgari, Esrafil; Sharafkhani, Rahim; Sardar, Mahdieh; Sarkhosh, Maryam; Almasiane, Mohammad

doi:10.5004/dwt.2019.24381

Cited by 36 publications

(3 citation statements)

References 43 publications

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“…So, the pseudo second order model fits well the competitive sorption process of Cd/Fe mixture on bentonite. Similar results were found by Sheikhmohammadi et al (2019) and Zeroual et al (2020). To better explain the very close results found in this case, a comparative study between the two models has been carried out.…”

Section: Adsorption Reaction Modelssupporting

confidence: 91%

Simultaneous sorption of heavy metals on Algerian Bentonite: mechanism study

Yous

Khalladi

Cherifi

2021

Water Science and Technology

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Industrialization has induced tremendous environmental problems, particularly surface and underground water pollution by harmful heavy metals. In this work, we attempt to eliminate simultaneously iron and cadmium from aqueous solutions by adsorption on Algerian Bentonite. This abundant material was used without any modification. The sorption mechanism was investigated, and effects of pH, initial adsorbate and adsorbent concentrations were studied. The kinetics study revealed that equilibrium was reached after 120 min for both metals, and maximal adsorbed quantities of cadmium (76 mg/g) and iron (55 mg/g ) were obtained at pH = 10 and 8 respectively. Different kinetic models were tested, such as pseudo first-order, pseudo second-order, film and intraparticle diffusion models. The pseudo second-order model fits well the experimental data. Biot number values (2–39) show that the simultaneous sorption process is controlled by film diffusion due to electrostatic interactions between negatively charged surface and cations, then by the internal diffusion and formation of bonds between cations and adsorbent constituents. Also, compared to iron, the high and rapid sorption of cadmium reflects the selective nature of the sorption process. These results show that raw bentonite could be used without further treatment as an efficient sorbent for heavy metal mixtures.

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Section: Adsorption Reaction Modelssupporting

confidence: 91%

Simultaneous sorption of heavy metals on Algerian Bentonite: mechanism study

Yous

Khalladi

Cherifi

2021

Water Science and Technology

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“…Solution temperature affects the rate of adsorption 59 . According to Arrhenius, absorption rate usually elevates with increasing temperature and reduces with decreasing temperature 33 .…”

Section: Resultsmentioning

confidence: 99%

Dual immobilization of magnetite nanoparticles and biosilica within alginate matrix for the adsorption of Cd(II) from aquatic phase

Safari

Rezaee

Soltani

et al. 2022

Sci Rep

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The adsorption of cadmium ions by magnetite (Fe3O4)@biosilica/alginate (MBA nano-hybrid) was the main aim of the present investigation. Herein, MBA nano-hybrid was synthesized via chemical precipitation technique. As-synthesized MBA nano-hybrid was characterized using FT-IR, FESEM and XRD analyzes. Based on the results, the maximum adsorption capacity of the adsorbent for the removal of Cd(II) was obtained at the initial pH of 7.0. At the initial Cd(II) concentration of 40 mg/L, increasing the reaction time to 180 min led to the Cd adsorption of 35.36 mg/g. Since the removal of Cd(II) after the reaction time of 60 min was insignificant, the reaction time of 60 min was considered as optimum reaction time for performing the experimental runs. According to the results, Langmuir isotherm and pseudo-second order kinetic models were the best fitted models with high correlation coefficients (R2 > 0.99). The results of thermodynamic study indicated exothermic (positive ΔH°) and spontaneous nature (negative ΔG°) of the adsorption of Cd(II) on the surface of MBA nano-hybrid. Negligible reduction in the adsorption capacity of the nano-hybrid was observed (16.57%) after fifth experimental runs, indicating high reusability potential of the as-synthesized nano-hybrid adsorbent.

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“…(hydroxyl, epoxy, carbonyl and carboxyl groups) of GO facilitate the facile introduction of desired functional groups [22][23][24][25][26][27] , which enable adsorbent applications for removal of harmful elements. Due to these properties, many GO composites have been studied for the adsorption of heavy metals (Table 1).…”

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confidence: 99%

Performance Differences of Hexavalent Chromium Adsorbents Caused by Graphene Oxide Drying Process

Lee

Kim

Lee

et al. 2020

Sci Rep

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In this study, the influence of drying conditions on amine (−nH 3) functionalization of graphene oxide (GO) was evaluated, and the hexavalent chromium (Cr(VI)) adsorption efficiency of the prepared materials was compared. 3-[2-(2-aminoehtylamino) ethylamino]propyl-trimethoxysilane (3N) was used for amine functionalization. The synthesized materials were analyzed by SEM, BET, TGA, XPS, and EA. TGA results showed that the solution-GO (SGO) was functionalized by more 3N molecules than freezedried GO (FDGO) and oven-dried GO (ODGO). Additionally, XPS analysis also showed that the ratio of N/C and Si/C was relatively high in SGO than FDGO and ODGO. The maximum adsorption capacity of SGO, FDGO, and ODGO for Cr(VI) was 258.48, 212.46, and 173.45 mg g −1 , respectively. These results indicate that it is better to use SGO without drying processes for efficient amine functionalization and Cr(VI) removal. However, when the drying process is required, freeze-drying is better than oven-drying. The active development in various industrial sectors, such as textile, metal finishing, leather tanning, stainless steel, and electroplating 1-7 contribute to the discharge of contaminated wastewater containing inorganic (heavy metals, phosphates, nitrates, sulfates, etc.), organic (phenols, dyes, pesticides, pharmaceutical compounds, etc.), and biological (bacteria, viruses, etc.) compounds. Among these, heavy metals such as chromium (Cr), arsenic (As), copper (Cu), lead (Pb), cadmium (Cd), and mercury (Hg) are typical toxic substances that exist as cations and anions in water 8. Chromium exists in two stable oxidation states, which are the hexavalent chromium (Cr(VI)) and trivalent chromium (Cr(III)) variants 9. While Cr(III) is minimally toxic, Cr(VI) is highly toxic and causes significant environmental damage 10. Further, Cr(VI) can cause carcinogenesis and mutations in humans. For these reasons, the World Health Organization (WHO) regulates the concentration of Cr(VI) in drinking water to less than 50 ng•L −1 11. To comply with this rigorous and necessary regulation, the application of water treatment techniques that can remove low concentrations of Cr(VI) is required. Various techniques, such as, redox, ion-exchange, adsorption, membrane filtration, and the like 12-16 are applied according to the purpose. However, the removal of low concentrations of Cr(VI) with most of these wastewater treatment systems is highly challenging. Among these approaches, adsorption is more effective for Cr(VI) removal since adsorbents are eco-friendly and not generating by-products 17. Therefore, we conducted further research on advancing adsorption technology for the removal of Cr(VI) from wastewater. For the first time, in this study, we developed an adsorbent based on graphene oxide (GO) and evaluated its Cr(VI)-adsorption performance. GO has been used in various fields such as electronic, biological, and physical applications 18 owing to its several advantages, such as straightforward synthesis, good solution stability, and the large surface-area-...

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Fabrication of magnetic graphene oxide nanocomposites functionalized with a novel chelating ligand for the removal of Cr(VI): Modeling, optimization, and adsorption studies

Cited by 36 publications

References 43 publications

Simultaneous sorption of heavy metals on Algerian Bentonite: mechanism study

Simultaneous sorption of heavy metals on Algerian Bentonite: mechanism study

Dual immobilization of magnetite nanoparticles and biosilica within alginate matrix for the adsorption of Cd(II) from aquatic phase

Performance Differences of Hexavalent Chromium Adsorbents Caused by Graphene Oxide Drying Process

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