Hexavalent chromium recovery by liquid–liquid extraction with 2-octylaminopyridine from acidic chloride media and its sequential separation from other heavy toxic metal ions

Mane, Chandrashekhar P.; Mahamuni, Sandip V.; Kolekar, Sanjay S.; Han, Sung‐Hwan; Anuse, Mansing A.

doi:10.1016/j.arabjc.2012.03.021

Cited by 34 publications

(6 citation statements)

References 23 publications

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“…•− were responsible for the oxidative decomposition of BPA. [35] The selective screen of Cr sites by EDTA-2Na may also contribute to intense quenching effect, [36] demonstrating that the single-atom Cr sites played an important role in the catalytic degradation process. The photocatalytic process in the SA-Cr/PN-g-C 3 N 4 + Vis system can be described by the following equations [37] ν…”

Section: Mechanism Studiesmentioning

confidence: 99%

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Chen

Shi

et al. 2021

Adv Funct Materials

167

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Heterogeneous Fenton‐like reactions (HFLR) are promising alternative strategies to address the inherent limitations of the classic Fenton systems. Herein, a facile and scale‐up approach for the synthesis of transition metal single‐atom sites (SA‐TM, TM = Cr, Mn, Fe, Co, Cu) coordinated onto pyrrolic N‐rich g‐C3N4 (PN‐g‐C3N4) scaffold is developed. The regulated pyrrolic N‐rich SA‐TM catalytic sites exhibit excellent performances for HFLR. As a model of SA‐TM/PN‐g‐C3N4, SA‐Cr/PN‐g‐C3N4 is efficient for the catalytic oxidation of bisphenol A via HFLR under visible light with outstanding cyclic stability and wide effective pH range (3.0–11.0). The synergy of photocatalysis and single‐atom catalysis leads to accelerated production and separation of charge carriers as well as the cycling of Cr3+/Cr2+ couple, consequently boosting the performance in HFLR. Theoretical calculations indicate that the Cr(II)‐N4 sites with the metalloporphyrin‐like structure are more reactive than the doped Cr(II) sites in the g‐C3N4 matrix, which act as the peroxidase‐mimicking nanozyme for efficient and homolytic cleavage of peroxide OO in H2O2. This study expands the family of the iron‐free Fenton‐like systems and provides new strategies to the rational design and precise regulation of on‐demand multifunctional single‐atom catalysts for advanced water remediation.

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Section: Mechanism Studiesmentioning

confidence: 99%

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Chen

Shi

et al. 2021

Adv Funct Materials

167

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“…Thus, chromium removal from wastewater is mandatory before releasing into the environment. Several conventional treatment process, such as chemical precipitation (Karale et al 2007;Ramakrishnaiah and Prathima 2012), membrane separation (Rad et al 2009;Zargar 2012), ion exchange (Dharnaik and Ghosh 2014;Dima et al 2015) and solvent extraction (Sahu et al 2008;Mane et al 2012), have been used for abatement of chromium from wastewater. However, conventional techniques are having the limitations of high chemical or energy requirements, formation of secondary pollutants, high cost, toxic sludge generation, etc.…”

Section: Introductionmentioning

confidence: 99%

Application of RSM and ANN for optimization and modeling of biosorption of chromium(VI) using cyanobacterial biomass

2018

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Proper treatment of heavy metal ions present in wastewaters is a major concern. With extensive usage in various industries, Cr(VI) contamination has become threatening for the environment. Biosorption is a favorable technique for heavy metals removal. In the present study, dried cyanobacterial consortium of Dinophysis caudata and Dinophysis acuminata were used to assess its biosorption capability. The surface texture and morphology of the biosorbent were obtained through scanning electron microscopy. The presence of different chemical bonds, namely hydroxyl, C-H and C-N, was confirmed through FTIR study. Pseudo-second-order Mckay-Ho model was found to perform best to fit the kinetic data. Temkin adsorption isotherm model fit best to the equilibrium data. Response surface methodology (RSM) was employed to optimize Cr(VI) abatement. Effect of initial concentration (IC) of metal ion, temperature, pH variation and amount of adsorbent (AD) were studied during batch study. Maximum Cr(VI) abatement after 5 min contact time was 80.77% for an IC of Cr(VI) of 25 mg/L, at pH 11 and 45 °C with the AD of 2.5 g/L. The optimum removal conditions as shown by RSM study were IC of Cr(VI): 15 mg/L, AD: 1 g/L, pH: 11, and the removal was predicted as 81.72%. Artificial neural network-based model was further developed based on experimental points which indicated that the model can predict abatement of Cr(VI) for various operating conditions with reasonably high accuracy.

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“…Therefore, the reduction of Cr(VI) to Cr(III) with a suitable green approach and eco-friendly materials is extremely important. Various methods have been developed for the reduction of Cr(VI) to Cr(III) and include adsorption, photocatalytic reduction, , electrochemical reduction, ion-exchange, liquid–liquid extraction, biosorption, electrocoagulation, and precipitation . These methods have however shown some disadvantages like high cost and lower concentration detection. , Hence, the researchers are significantly challenged to develop a potential environmentally conducive method.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembled Silver Nanoparticles Decorated on Exfoliated Graphitic Carbon Nitride/Carbon Sphere Nanocomposites as a Novel Catalyst for Catalytic Reduction of Cr(VI) to Cr(III) from Wastewater and Reuse for Photocatalytic Applications

Prabakaran

Pillay

2021

ACS Omega

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Silver nanoparticles decorated on an exfoliated graphitic carbon nitride/carbon sphere (AgNP/Eg-C 3 N 4 /CS) nanocomposites were synthesized by an adsorption method with a self-assembled process. These nanoparticles were characterized by different techniques like UV–visible (UV–vis) spectroscopy, photoluminescence (PL) spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), Raman spectroscopy, scanning electron spectroscopy (SEM), transmission electron spectroscopy (TEM), electrochemical impedance spectroscopy (EIS), and ζ potential. AgNP/Eg-C 3 N 4 /CS nanocomposites showed a higher catalytic reduction activity for the conversion of Cr(VI) into Cr(III) with formic acid (FA) at 45 °C when compared to bulk graphitic carbon nitride (Bg-C 3 N 4 , Eg-C 3 N 4 , CS, and Eg-C 3 N 4 /CS). The kinetic rate constants were determined as a function of catalyst dosage, concentration of Cr(VI), pH, and temperature for the AgNP/Eg-C 3 N 4 /CS nanocomposite. This material showed higher reduction efficiency (98.5%, k = 0.0621 min –1 ) with turnover frequency (0.0158 min –1 ) for the reduction of Cr(VI) to Cr(III). It also showed great selectivity and high stability after six repeated cycles (98.5%). Further, the reusability of the Cr(III)-AgNP/Eg-C 3 N 4 /CS nanocomposite was also investigated for the photocatalytic degradation of methylene blue (MB) under visible light irradiation with various time intervals and it showed good degradation efficiency (α = 97.95%). From these results, the AgNP/Eg-C 3 N 4 /CS nanocomposite demonstrated higher catalytic activity, improved environmental friendliness, lower cost for the conversion of toxic Cr(VI) to Cr(III) in solutions, and also good reusability.

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Hexavalent chromium recovery by liquid–liquid extraction with 2-octylaminopyridine from acidic chloride media and its sequential separation from other heavy toxic metal ions

Cited by 34 publications

References 23 publications

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Application of RSM and ANN for optimization and modeling of biosorption of chromium(VI) using cyanobacterial biomass

Self-Assembled Silver Nanoparticles Decorated on Exfoliated Graphitic Carbon Nitride/Carbon Sphere Nanocomposites as a Novel Catalyst for Catalytic Reduction of Cr(VI) to Cr(III) from Wastewater and Reuse for Photocatalytic Applications

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Hexavalent chromium recovery by liquid–liquid extraction with 2-octylaminopyridine from acidic chloride media and its sequential separation from other heavy toxic metal ions

Cited by 34 publications

References 23 publications

Molecular Engineering toward Pyrrolic N‐Rich M‐N4 (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Molecular Engineering toward Pyrrolic N‐Rich M‐N4 (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Application of RSM and ANN for optimization and modeling of biosorption of chromium(VI) using cyanobacterial biomass

Self-Assembled Silver Nanoparticles Decorated on Exfoliated Graphitic Carbon Nitride/Carbon Sphere Nanocomposites as a Novel Catalyst for Catalytic Reduction of Cr(VI) to Cr(III) from Wastewater and Reuse for Photocatalytic Applications

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Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction

Molecular Engineering toward Pyrrolic N‐Rich M‐N₄ (M = Cr, Mn, Fe, Co, Cu) Single‐Atom Sites for Enhanced Heterogeneous Fenton‐Like Reaction