Magnetic graphene-based nanocomposites as highly efficient absorbents for Cr(VI) removal from wastewater

Zhang, Xiuxiu; Yi, Guiyun; Zhang, Zhengting; Jia, Yu; Fan, Haiyang; Li, Peng; Zeng, Huihui; Xing, Baolin; Chen, Lunjian; Zhang, Chuanxiang

doi:10.1007/s11356-020-11634-x

Cited by 14 publications

(5 citation statements)

References 41 publications

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“…With the acceleration of industrialization, the conundrum of water pollution has severely threatened the living environment of human beings, which imminently needs to be resolved (Gavrilescu et al 2015;Liu et al 2020;Reddy et al 2018;Zhang et al 2019Zhang et al , 2021. Phenolic compounds are a kind of persistent organic contaminants in wastewater with low biodegradability, which can cause serious and long-term risks to human health.…”

Section: Introductionmentioning

confidence: 99%

Construction of nitrogen vacant g-C3N4 nanosheet supported Ag3PO4 nanoparticle Z-scheme photocatalyst for improved visible-light photocatalytic activity

Zhang

Zheng

et al. 2021

Environ Sci Pollut Res

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The superior photocatalytic activity of semiconductor-based photocatalytic materials has attracted great attention. In this work, a series of novel Ag 3 PO 4 /g-C 3 N 4−x (APO/CNx) composites with the Z-scheme structure were fabricated through a facile precipitation method. B naphthol, a typical phenolic compound, was selected to evaluate the photocatalytic activity of all as-prepared photocatalysts. The obtained APO/CNx composites exhibited excellent photocatalytic activity for degradation of B naphthol under visible-light irradiation. Experimental results showed that the degradation rate toward B naphthol could reach to 90.5% for 180 min, which was almost 3.66 times higher than pure g-C 3 N 4 , indicating that the presence of nitrogen vacancies and Z-scheme structure could efficiently improve the photocatalytic performance of pure g-C 3 N 4 . Furthermore, the results of trapping experiments and electron spin resonance (ESR) spectroscopy manifest that •O 2 − and •OH radicals were the predominant active substances for B naphthol degradation, and the possible mechanism of improved photocatalytic performance was elucidated. This work will provide an innovative perspective for constructing Z-scheme photocatalysts for the application of photocatalytic in the field of wastewater treatment.

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Section: Introductionmentioning

confidence: 99%

Construction of nitrogen vacant g-C3N4 nanosheet supported Ag3PO4 nanoparticle Z-scheme photocatalyst for improved visible-light photocatalytic activity

Zhang

Zheng

et al. 2021

Environ Sci Pollut Res

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“…The XRD arrangement of pure PMMA gives no peak due to its amorphous nature. The XRD design of the composite (MNPs/rGO/PMMA), exhibits peaks corresponding to Fe 3 O 4 at 2θ of 30.38 • (220), 35.5 • (331), 43.22 • (400) and 57.36 • (511), respectively, which confirms the MNPs/rGO/PMMA composite [40,41]. From the XRD data, the crystallite size of the composite was estimated to be 31 nm.…”

Section: Characteristics Of Adsorbentmentioning

confidence: 63%

Fabrication of MNPs/rGO/PMMA Composite for the Removal of Hazardous Cr(VI) from Tannery Wastewater through Batch and Continuous Mode Adsorption

et al. 2021

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Herein, we report the synthesis of magnetic nanoparticle (MNP)-reduced graphene oxide (rGO) and polymethylmethacrylate (PMMA) composite (MNPs/rGO/PMMA) as adsorbent via an in situ fabrication strategy and, in turn, the application for adsorptive removal and recovery of Cr(VI) from tannery wastewater. The composite material was characterized via XRD, FTIR and SEM analyses. Under batch mode experiments, the composite achieved maximum adsorption of the Cr(VI) ion (99.53 ± 1.4%, i.e., 1636.49 mg of Cr(VI)/150 mg of adsorbent) at pH 2, adsorbent dose of 150 mg/10 mL of solution and 30 min of contact time. The adsorption process was endothermic, feasible and spontaneous and followed a pseudo-2nd order kinetic model. The Cr ions were completely desorbed (99.32 ± 2%) from the composite using 30 mL of NaOH solution (2M); hence, the composite exhibited high efficiency for five consecutive cycles without prominent loss in activity. The adsorbent was washed with distilled water and diluted HCl (0.1M), then dried under vacuum at 60 °C for reuse. The XRD analysis confirmed the synthesis and incorporation of magnetic iron oxide at 2θ of 30.38°, 35.5°, 43.22° and 57.36°, respectively, and graphene oxide (GO) at 25.5°. The FTIR analysids revealed that the composite retained the configurations of the individual components, whereas the SEM analysis indicated that the magnetic Fe3O4–NPs (MNPs) dispersed on the surface of the PMMA/rGO sheets. To anticipate the behavior of breakthrough, the Thomas and Yoon–Nelson models were applied to fixed-bed column data, which indicated good agreement with the experimental data. This study evaluates useful reference information for designing a cost-effective and easy-to-use adsorbent for the efficient removal of Cr(VI) from wastewater. Therefore, it can be envisioned as an alternative approach for a variety of unexplored industrial-level operations.

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“…This observation concludes that the PSO model is the best‐fitted model in the adsorption process, suggesting that chemisorption occurs in adsorption. [ 45 ]…”

Section: Resultsmentioning

confidence: 99%

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

Rout

Jena

2022

J Chinese Chemical Soc

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In this study, the reduced form of graphene oxide (RGO) has been synthesized by using hydrazine hydrate as a reducing agent and used for Cr(VI) removal. The physicochemical properties of the as‐synthesized material were studied by FESEM, XRD, RAMAN, and FTIR. The optimized adsorption parameters were time of 75 min, solution pH 3.0, temperature 35°C, and dosage of 0.3 g/l. The isotherms were perfectly simulated by the Langmuir model, and the kinetic data followed the pseudo‐second‐order model. The maximum uptake capacity was 787.401 mg/g at 35°C. Thermodynamic analysis indicated an endothermic and spontaneous process occurs. Competition from interfering ions (SO42−, NO3−, Cl−, HCO3−, Co2+, and Cu2+) proved insignificant. After five cycles of regeneration, the removal remains at 85.75%. From the column study, it was observed that the parameters like breakthrough time (tb), bed capacity (qbed), and exhaustion time (te) increase with an increase in bed height and decrease with an increase in Cr(VI) flow rate. Adsorption performance for industrial effluents shows up to 55.32% removal. The above superior adsorption performance validated the application of the RGO as an efficient adsorbent for the remediation of Cr(VI) ions from wastewater.

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Magnetic graphene-based nanocomposites as highly efficient absorbents for Cr(VI) removal from wastewater

Cited by 14 publications

References 41 publications

Construction of nitrogen vacant g-C3N4 nanosheet supported Ag3PO4 nanoparticle Z-scheme photocatalyst for improved visible-light photocatalytic activity

Construction of nitrogen vacant g-C3N4 nanosheet supported Ag3PO4 nanoparticle Z-scheme photocatalyst for improved visible-light photocatalytic activity

Fabrication of MNPs/rGO/PMMA Composite for the Removal of Hazardous Cr(VI) from Tannery Wastewater through Batch and Continuous Mode Adsorption

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

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