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

Peng, Hao; Shang, Qian; Chen, Ronghua; Leng, Yumeng; Guo, Jing; Liu, Zuohua; Tao, Changyuan

doi:10.1021/acsomega.0c00339

Cited by 19 publications

(13 citation statements)

References 50 publications

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“…The interactions between the experimental parameters were important for the experimental results, which were ignored during the single-factor experiment; thus, RSM was applied to optimize the experimental process and order the significance of the experimental parameters [13,29,30]. In this paper, the experimental parameters that affected the reduction process were selected as A (m (C)/m(Cr)), B (reaction temperature), C (reaction time), and D (concentration of H 2 SO 4 ).…”

Section: Response Surface Optimizationmentioning

confidence: 99%

Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

et al. 2021

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A highly efficient reduction process of Cr (VI) with biochar was conducted in this paper. The results showed that nearly 100% Cr (VI) was reduced at selected reaction conditions: Dosage of biochar at m (C)/m(Cr) = 3.0, reaction temperature of 90 °C, reaction time of60 min, and concentration of H2SO4 of 20 g/L. The reduction kinetics analysis demonstrated that the reduction of Cr (VI) fitted well with the pseudo-first-order model and the apparent activation energy was calculated to be 40.24 kJ/mol. Response surface methodology confirmed that all of the experimental parameters had a positive effect on the reduction of Cr (VI). The influence of each parameter on the reduction process followed the order: Dosage of biochar>concentration of H2SO4>reaction temperature >reaction time. This paper provides a versatile strategy for the treatment of wastewater containing Cr (VI) and shows a bright tomorrow for wastewater treatment.

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Section: Response Surface Optimizationmentioning

confidence: 99%

Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

et al. 2021

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“…The interactions between experimental parameters were important for the experimental results while it had been ignored during the single factor experiment, thus, RSM was applied to optimize the experimental process and order the significance of experimental parameters [13,29,30]. In this paper, the experimental parameters affected the reduction process were selected as A (m (C)/m(Cr)), B (Reaction Temperature), C (Reaction Time) and D (Concentration of H2SO4).…”

Section: Response Surface Optimizationmentioning

confidence: 99%

Efficient Removal of Cr (VI) with Biochar and Parameters Optimized by Response Surface Methodology

Peng¹,

Guo²

2021

Preprint

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A highly efficient reduction process of Cr (VI) with biochar was conducted in this paper. The results showed that nearly 100% Cr (VI) was reduced at selected reaction conditions: the dosage of biochar at m (C)/m(Cr) = 3.0, reaction temperature of 90 ℃, reaction time at 60 min and concentration of H2SO4 of 20 g/L, respectively. The reduction kinetics analysis demonstrated that the reduction of Cr (VI) fitted well with the pseudo-first-order model and the apparent activation energy was calculated to 40.24 kJ/mol. Response surface methodology confirmed that all the experimental parameters had positive effect on the reduction of Cr (VI). The influence of each parameter on the reduction process followed the order: dosage of biochar> Concentration of H2SO4 > Reaction Temperature > Reaction Time. This paper provided a versatile strategy for treatment of wastewater containing Cr (VI) and showed a bright tomorrow for wastewater treatment.

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“…The main reaction during the reduction process was between chromium and oxalic acid. The △G of main reactions were calculated at 298 K [21][22][23] . The results displayed in Figure 1b showed that the △G was negative, which indicated that the reduction of Cr (VI) with oxalic acid was feasible in thermodynamic.…”

Section: Resultsmentioning

confidence: 99%

Reduction Behavior of Chromium (VI) with Oxalic Acid in Aqueous Solution

Peng¹,

Guo²,

Yuan³

et al. 2020

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The direct Cr (VI) reduction process by oxalic acid was conducted and the results showed that the Cr (VI) was efficiently reduced by oxalic acid at high reaction temperature and high dosage of oxalic acid. The reduced product, Cr (III), was easily generated stable complex compounds (Cr(HC2O4)3) with oxalate, which displayed a negative effect on the reduction process. The high reaction temperature and high acidic medium could destroy the stable structure of a complex compound to release oxalate, and facilitate the reduction of Cr (VI). Generally, the present study provided a versatile strategy for Cr (VI) reduction, exhibiting a bright application future for real wastewater treatment.

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

Cited by 19 publications

References 50 publications

Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

Efficient Removal of Cr (VI) with Biochar and Optimized Parameters by Response Surface Methodology

Efficient Removal of Cr (VI) with Biochar and Parameters Optimized by Response Surface Methodology

Reduction Behavior of Chromium (VI) with Oxalic Acid in Aqueous Solution

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