Highly efficient oxidation of chromium (III) with hydrogen peroxide in alkaline medium

Peng, Hao; Guo, Jing; Li, Gang; Cheng, Qinzhe; Zhou, Yuju; Liu, Zuohua; Tao, Changyuan

doi:10.2166/wst.2019.056

Cited by 15 publications

(7 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that E Cr 2 O 7 /Cr 3+ 0 = 1.33 V and E VO 2 + /VO 2+ 0 = 1.00 V; therefore, K 2 Cr 2 O 7 was used to oxidize low-valence vanadium during the leaching process. The Δ G of the main reactions were calculated at 298 K. , The results displayed in Figure show that the Δ G was negative, indicating that the oxidative leaching of low-valence vanadium with K 2 Cr 2 O 7 was feasible.…”

Section: Resultsmentioning

confidence: 99%

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K₂Cr₂O₇

et al. 2020

Self Cite

View full text Add to dashboard Cite

Oxidative-alkaline leaching of vanadium from vanadiumchromium-reducing residues with K 2 Cr 2 O 7 was investigated in this paper. The effects of processing parameters including dosage of NaOH, dosage of K 2 Cr 2 O 7 , reaction time, and reaction temperature on the leaching efficiency of vanadium were studied. The results simulated by response surface methodology indicated that vanadium leaching was affected significantly by the dosage of K 2 Cr 2 O 7 and NaOH, and the processing parameters that affected the leaching efficiency of vanadium followed the order m(NaOH)/ m(residue) > m(K 2 Cr 2 O 7 )/sssssm(residue) > reaction temperature > reaction time. The leaching efficiency of vanadium was up to 99.92% under optimal conditions: reaction temperature of 90 °C, reaction time of 60 min, liquid-tosolid ratio of 5:1 mL g −1 , m(K 2 Cr 2 O 7 )/m(residue) = 0.10, and m(NaOH)/ m(residue) = 0.30. The kinetics analysis indicated that diffusion through the product layer was the controlling step and the apparent activation energy for vanadium leaching was calculated to be 58.275 kJ•mol −1 .

show abstract

Section: Resultsmentioning

confidence: 99%

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K₂Cr₂O₇

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, the main reaction during the oxidative leaching process was between the low valent vanadium and MnO2 like Equation (2) and (3). The T G   of Equation (2) [21,22]. The results showed in Figure 2 showed that the △G was negative which indicated that the reaction of Equations (2) and (3) were easy to happen and the oxidative leaching of vanadium with MnO2 was feasible.…”

Section: Reaction Mechanismmentioning

confidence: 98%

Oxidative Leaching of Vanadium from Vanadium-Chromium Reducing Residue with MnO<sub>2</sub>

Peng¹,

Liu²,

Chen³

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

This paper focused on the oxidative leaching process of vanadium from vanadium-chromium reducing residue in alkaline medium with MnO2. The effect of experimental parameters including reaction time, reaction temperature, dosage of MnO2, dosage of NaOH, and liquid-to-solid ratio on the leaching efficiency of vanadium had been studied. The results indicated that MnO2 was an efficient oxidant for leaching out of vanadium. The leaching efficiency of vanadium was up to 97.25% under optimal reaction conditions: reaction temperature of 90 ℃, reaction time of 60 min, dosage of MnO2 at 50 wt.%, concentration of NaOH at 30 wt.% and liquid-to-solid at 5:1 mL/g.

show abstract

“…The chromium contents of some leather tanning wastewater and Ni-chrome heating wires were potentiometrically determined using the proposed paper and ceramic based sensors under batch and hydrodynamic (FIA) modes of measurements. The samples were acidified with dilute HCl, followed by oxidation with alkaline hydrogen peroxide (30%) to convert Cr(III) into Cr(VI) (Equation (4)) [37] before assessment of the total chromium [Cr(III) + Cr(VI)] by the proposed sensors. Parallel runs were performed using flame atomic absorption spectrometry for comparison.…”

Section: Determination Of Chromium In Some Environmental and Industrimentioning

confidence: 99%

Paper Strip and Ceramic Potentiometric Platforms Modified with Nano-Sized Polyaniline (PANi) for Static and Hydrodynamic Monitoring of Chromium in Industrial Samples

et al. 2020

View full text Add to dashboard Cite

Screen-printed membrane sensors based on the use of paper and ceramic substrates are fabricated, characterized, and used for rapid batch and continuous monitoring of CrIII in the form of CrO42− in some industrial products and wastewater samples. Strips of paper and ceramic platforms (15 × 5 mm) were covered with conductive carbon paint and then modified with polyaniline (PANI) film, to act as an ion-to-electron transducer, followed by a drop casting of plasticized poly (vinyl chloride) (PVC) Rhodamine-B chromate membrane as a recognition sensing material. In a 5.0 mmol L−1 Trizma buffer solution of pH ~8, the fabricated paper and ceramic based membrane sensors exhibited a near Nernstian response for CrVI ion with slopes of −29.7 ± 0.5 and −28.6 ± 0.3 mV decade−1, limit of detection 2.5 × 10−5 and 2.4 × 10−6 mol L−1 (1.3–0.12 µg mL−1), and linear concentration range 7.5 × 10−3–5.0 × 10−5 and 7.5 × 10−3–1.0 × 10−5 mol L−1 (390-0.5 µg mL−1), respectively. Both sensors exhibited fast and stable potentiometric response, excellent reproducibility, and good selectivity with respect to a number of common foreign inorganic species. Impedance spectroscopy and chronopotentiometry data revealed a small resistance and a larger double layer capacitance due to the presence of the intermediate polyaniline (PAN) conductive layer. Furthermore, the formation of a water layer between the ion selective membrane (ISM) and the underlying conductor polymer and between the conducting polymer and the carbon conducting surface was greatly reduced. The developed disposable solid-contact potentiometric sensors offer the advantages of simple design, long term potential stability, flexibility, miniaturization ability, short conditioning time, and cost effectiveness that enable mass production. The sensors were successfully used for static and hydrodynamic measurements of total chromium in some leather tanning wastewater and nickel-chrome alloy samples. The results compare favorably with data obtained by atomic absorption spectrometry.

show abstract

Highly efficient oxidation of chromium (III) with hydrogen peroxide in alkaline medium

Cited by 15 publications

References 34 publications

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K₂Cr₂O₇

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K₂Cr₂O₇

Oxidative Leaching of Vanadium from Vanadium-Chromium Reducing Residue with MnO<sub>2</sub>

Paper Strip and Ceramic Potentiometric Platforms Modified with Nano-Sized Polyaniline (PANi) for Static and Hydrodynamic Monitoring of Chromium in Industrial Samples

Contact Info

Product

Resources

About

Highly efficient oxidation of chromium (III) with hydrogen peroxide in alkaline medium

Cited by 15 publications

References 34 publications

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K2Cr2O7

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K2Cr2O7

Oxidative Leaching of Vanadium from Vanadium-Chromium Reducing Residue with MnO<sub>2</sub>

Paper Strip and Ceramic Potentiometric Platforms Modified with Nano-Sized Polyaniline (PANi) for Static and Hydrodynamic Monitoring of Chromium in Industrial Samples

Contact Info

Product

Resources

About

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K₂Cr₂O₇

Oxidative Leaching Kinetics of Vanadium from the Vanadium-Chromium-Reducing Residue with K₂Cr₂O₇