Removal of hexavalent chromium via biochar-based adsorbents: State-of-the-art, challenges, and future perspectives

Sinha, Rama; Kumar, Rakesh; Sharma, Prabhakar; Kant, Nishi; Shang, Jianying; Aminabhavi, Tejraj M.

doi:10.1016/j.jenvman.2022.115356

Cited by 94 publications

(21 citation statements)

References 329 publications

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“…The specific microstructure allows the interaction with different pollutants by electrostatic forces, non-covalent forces, or hydrophobic interactions, and different carbon nanostructures (carbon nanotubes, graphene, graphite, and activated carbon) have been widely employed [ 8 ]. Along with their high adsorption capacity, associated with a high surface area, the versatility of carbon adsorbents is linked to the possibility to be obtained by different low-cost procedures (e.g., biomass pyrolysis) [ 9 ]. However, the decantation and separation of the adsorbent from the aqueous media and its reuse after subsequent treatment cycles represents a current technological issue in the search of cost-effective processes [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fe/Fe3C@C Nanoadsorbents for Efficient Cr (VI) Removal

Cervera-Gabalda

Gómez‐Polo

2022

IJMS

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Magnetic carbon nanocomposites (α-Fe/Fe3C@C) synthesized employing fructose and Fe3O4 magnetite nanoparticles as the carbon and iron precursors, respectively, are analyzed and applied for the removal of Cr (VI). Initial citric acid-coated magnetite nanoparticles, obtained through the co-precipitation method, were mixed with fructose (weight ratio 1:2) and thermally treated at different annealing temperatures (Tann = 400, 600, 800, and 1000 °C). The thermal decomposition of the carbon matrix and the Fe3O4 reduction was followed by thermogravimetry (TGA) and Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction, Raman spectroscopy, SQUID magnetometry, and N2 adsorption–desorption isotherms. A high annealing temperature (Tann = 800 °C) leads to optimum magnetic adsorbents (high magnetization enabling the magnetic separation of the adsorbent from the aqueous media and large specific surface area to enhance the pollutant adsorption process). Cr (VI) adsorption tests, performed under weak acid environments (pH = 6) and low pollutant concentrations (1 mg/L), confirm the Cr removal ability and reusability after consecutive adsorption cycles. Physical adsorption (pseudo-first-order kinetics model) and multilayer adsorption (Freundlich isotherm model) characterize the Cr (VI) absorption phenomena and support the enhanced adsorption capability of the synthesized nanostructures.

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Section: Introductionmentioning

confidence: 99%

Magnetic Fe/Fe3C@C Nanoadsorbents for Efficient Cr (VI) Removal

Cervera-Gabalda

Gómez‐Polo

2022

IJMS

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“…Chromium (VI) possibly can be reduced to Cr (III) by using several reductive chemical agents that can be moved out by surface-active adsorbents like Soya cake or Dissolution by LiCl, carbonnano-Onions (CNOs), [44,45]. High efficiency for the reduction of Cr (VI) to Cr (III) when the value of pH < 1.…”

Section: Discussionmentioning

confidence: 99%

The Strategies of Chromite Terrace in Sukinda Valley, India: An Appraisal

Mishra

Samal²,

Sohel³

et al. 2022

JSRR

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Iron chrome oxide (FeCr 2O4), is a commercially viable and major ingredient of stainless steel. The Odisha state in India possesses 98% of the pre-Cambrian India’s Chromite ore deposits in Sukinda valley, Jajpur District. To meet the present escalating demand for chromium in steel industries, it is urged to extract more chrome ore to satiate domestic needs. The depletion of chrome deposits, rise in demand, fewer chrome mines, and less conversion from tailings increase of more toxic hexavalent chrome ion level in the geo-bio hydrosphere, shall aggravate health concerns for the people, fauna, and flora in Sukinda Ultramafic Complex (SUC). The present quest is a collection of chromite ores and tailings. A chemical study is done by using the X-ray fluorescent spectrometer. An insitu/GIS study of the Sukinda ultramafic complex by using Arc-GIS, and ERADAS software has been done to originate hydrology, aspect, and hill-shade map of the valley. The literature, and as an inhabitant of the area helped in preparing the strategic plan through Environmental Impact Assessment and Environmental Management Plan. CR (III) is a dietary requirement. The anthropogenic activities and atmospheric exposure have converted Cr (III) to Cr (VI) in SUC and have surpassed the recommended values. The noxious Cr (VI) in the geo-bio-hydrosphere shall invite health and environmental concerns in the future. The aboriginals of SUC are economically burdened with food insecurity, poor livelihood, health, and of formal societal values. The Sukinda Valley ore samples contain 50% chromite ore is economic. But the >7% of CR (III) ore in the tailings and overburden shall warrant the future expected exorbitant Cr (VI) in the geo-bio-hydro environment of Sukinda valley.

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“…Several sorbents, such as biomaterials, zeolites, metal oxides, activated carbon, bio-sorbents, and activated alumina clay, have been extensively utilized for Pb 2+ ion removal. [19][20][21] Furthermore, all of these traditional sorbents exhibited low adsorption capacity for Pb removal. 22 Two-dimensional materials have been utilized to remove heavy metals, dyes, and pharmaceuticals from wastewater via the adsorption technique.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%