Adsorption mechanism of Cr(VI) on woody-activated carbons

Wang, Hua; Wang, Wencheng; Song, Zhou; Gao, Xuchun

doi:10.1016/j.heliyon.2023.e13267

Cited by 32 publications

(13 citation statements)

References 61 publications

(70 reference statements)

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“…The slope signifies the value of 1/ q m and the intercept corresponds to 1/( K l × q m ). The determined Cr(VI) adsorption amount ( q m ) is 13.123 mg/g in the case of BVO-20-TC …”

Section: Resultsmentioning

confidence: 97%

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Razafintsalama,

Mishra,

Sahoo

et al. 2023

Langmuir

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The synergistically MXene (Ti 3 C 2 T x ) co-catalystdecorated BiVO 4 -based heterostructured photocatalysts have been synthesized by a hydrothermal approach with varied loading concentrations of MXene (Ti 3 C 2 T x ) to drive the hexavalent chromium reduction efficiently. The formation of the heterostructured photocatalyst was confirmed by the appearance of X-ray diffraction (XRD) peaks corresponding to the monoclinic BiVO 4 phase and MXene (Ti 3 C 2 T x ) and also the antisymmetric (834 cm −1 ) and symmetric stretching (715 cm −1 ) of tetrahedral VO 4 and D (1330 cm −1 ) and G (1570 cm −1 ) bands corresponding to MXene (Ti 3 C 2 T x ) in the Raman spectrum. The worm-like structures of BiVO 4 nanocrystals grew onto the lamellar sheets of MXene (Ti 3 C 2 T x ), as shown by field emission scanning electron microscopy (FESEM), and has an increased surface area of 15.62 m 2 g -1 in the case of BVO-20-TC. X-ray photoelectron spectroscopy (XPS) analysis confirms the presence of V 5+ and Ti 3+ states, and the uniform distribution of BiVO 4 nanocrystals over lamellar sheets of MXene (Ti 3 C 2 T x ) is evident from energy-dispersive X-ray (EDX) analysis. The ultraviolet-diffuse reflectance spectroscopy (UV-DRS) spectra suggest a decrease in the band gap energy of BVO-20-TC to 2.335 eV, promoting a higher degree of visible light harvesting. Upon optimization, by varying the pH, the amount of the photocatalyst, and the concentration of Cr(IV), BVO-20-TC exhibits the highest photocatalytic efficiency (96.39%) while using a Cr(VI) concentration of 10 ppm at pH 2 and 15 mg of the photocatalyst, and the photoreduction of Cr(VI) to Cr(III) follows the pseudo-first-order reaction. The decrease in the PL intensity in BVO-20-TC reveals a faster transfer of electrons from MXene (Ti 3 C 2 T x ) to BiVO 4 . Further, the higher degree of band bending at the BiVO 4 /MXene (Ti 3 C 2 T x ) heterojunction, revealed from the Mott−Schottky analysis, facilitates efficient charge transfer and eventually faster and efficient photoreduction of Cr(VI) to Cr(III). The reusability and stability test undertaken for BVO-20-TC reveals that even after five cycles, the Cr (VI) photoreduction efficacy is retained. This work provides insights into photoreduction of Cr (VI) by using such heterostructures.

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“…The slope signifies the value of 1/ q m and the intercept corresponds to 1/( K l × q m ). The determined Cr(VI) adsorption amount ( q m ) is 13.123 mg/g in the case of BVO-20-TC …”

Section: Resultsmentioning

confidence: 97%

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Razafintsalama,

Mishra,

Sahoo

et al. 2023

Langmuir

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“…The point of zero charge for the PAC was 9.9, as experimentally determined using the drift method. 22 Because the pH was 8 during the PAC experiment, the positively charged PAC attracted the negatively charged spore. Control experiments were carried out in the absence of PAC.…”

Section: Methodsmentioning

confidence: 99%

Characterizing Bacillus globigii as a Bacillus anthracis surrogate for wastewater treatment studies and bioaerosol emissions

Durden,

Eckhoff,

Burdsall

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…So, the high-efficiency removal of these metal ions is considered a dire need. Numerous methodologies have been reported for chromium minimization from contaminated water, including precipitation 16 , ion-exchange separation 17 , membrane filtration 16 , 18 , photocatalysis 16 , 19 , and adsorption 20 , 21 .…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the activated carbon doped with nZVI (AC/nZVI) was used as a sorbent for Cr 6+ removal with a sorption capacity of 25.00 mg/g 25 . The maximum adsorption capacity of activated carbon derived from wood was used to eliminate Cr 6+ with an adsorption capacity of 241.55 mg/g 16 . Zeolite coated with magnetic nanoparticles was used to remove Cr 3+ with a maximum removal capacity of 43 .…”

Section: Introductionmentioning

confidence: 99%

Hexavalent chromium ion removal from wastewater using novel nanocomposite based on the impregnation of zero-valent iron nanoparticles into polyurethane foam

Saad,

Abd-Elhafiz,

Ahmed

et al. 2024

Sci Rep

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In this study, we developed a novel nanocomposite, polyurethane foam impregnated with zero-valent iron nanoparticles (PU@nZVI), for the effective removal of chromium(VI) from various water sources. The characterization of nanocomposite (PU@nZVI) was performed by XRD, SEM–EDS, TEM and FT-IR techniques. Using the response surface methodology, we optimized the removal conditions, achieving an optimal pH of 2 and a dose of 0.5 g/L. The PU@nZVI demonstrated an excellent maximum adsorption capacity of 600.0 mg/g for Cr6+. The adsorption kinetics and isotherms were best described by the pseudo-second-order model and the Freundlich isotherm, respectively. Significantly, the nanocomposite removed 99.98% of Cr6+ from tap water, 96.81% from industrial effluent, and 94.57% from treated sewage wastewater. Furthermore, the PU@nZVI maintained its efficiency over five adsorption–desorption cycles, highlighting its reusability. These results suggest that the PU@nZVI nanocomposite is a highly efficient and sustainable option for chromium(VI) removal in water treatment applications.

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Adsorption mechanism of Cr(VI) on woody-activated carbons

Cited by 32 publications

References 61 publications

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Characterizing Bacillus globigii as a Bacillus anthracis surrogate for wastewater treatment studies and bioaerosol emissions

Hexavalent chromium ion removal from wastewater using novel nanocomposite based on the impregnation of zero-valent iron nanoparticles into polyurethane foam

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Adsorption mechanism of Cr(VI) on woody-activated carbons

Cited by 32 publications

References 61 publications

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO4-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO4-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Characterizing Bacillus globigii as a Bacillus anthracis surrogate for wastewater treatment studies and bioaerosol emissions

Hexavalent chromium ion removal from wastewater using novel nanocomposite based on the impregnation of zero-valent iron nanoparticles into polyurethane foam

Contact Info

Product

Resources

About

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics

Efficient Photocatalytic Reduction of Hexavalent Chromium by BiVO₄-Decorated MXene Photocatalysts and Their Charge Carrier Dynamics