Step-Adsorption of Vanadium (V) and Chromium (VI) in the Leaching Solution with Melamine

Peng, Hao; Shang, Qian; Chen, Ronghua; Zhang, Liuying; Chen, Ya; Guo, Jing

doi:10.1038/s41598-020-63359-z

Cited by 23 publications

(11 citation statements)

References 46 publications

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“…K2Cr2O7, H2SO4 and biochar were of analytical grade and used as received without further purification, which were purchased from Kelong Co., Ltd, Chengdu, China. All solutions were prepared with deionized water with a resistivity greater than 18 MΩ/cm (HMC-WS10) [12,13,19,28].…”

Section: Methodsmentioning

confidence: 99%

“…After the reduction process, the Cr (VI) was reduced to Cr (III) and it was removed by precipitation with sodium hydroxide [37] or adsorption with melamine [19,20].…”

Section: Removal Of Chromium (Iii)mentioning

confidence: 99%

“…Therefore, it is urgent to develop useful technologies for Cr (VI) treatment [16][17][18]. Recently, reduction of Cr (VI) to Cr (III) had attracted much more attention [12,13,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

“…After the reduction process, the Cr (VI) was reduced to Cr (III) and it was removed by precipitation with sodium hydroxide [37] or adsorption with melamine [19,20].…”

Section: Removal Of Chromium (Iii)mentioning

confidence: 99%

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

Peng¹,

Guo²

2021

Preprint

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“…Therefore, it is urgent to develop useful technologies for Cr (VI) treatment [16][17][18]. Recently, the reduction of Cr (VI) to Cr (III) has attracted much more attention [12,13,[19][20][21]. The reduction process of Cr (VI) with oxalic acid with and without Mn (II) has been investigated and the results showed that Cr (VI) could not be reduced in an oxalic acid solution or an Mn (II) solution, while nearly 99% of Cr (VI) reduced to Cr (III) in an oxalic acid solution mixed with Mn (II).…”

Section: Introductionmentioning

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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“…It was needed to develop new efficient techniques for Cr(VI) removal as problems associated with causing secondary pollution, large scale application and high cost were remained in current technologies. Recently, reduction of Cr(VI) to Cr(III) had attracted significant attention 12 , 13 , 16 , 17 .…”

Section: Introductionmentioning

confidence: 99%

Reduction behavior of chromium(VI) with oxalic acid in aqueous solution

Peng

Guo

2020

Sci Rep

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The direct Cr(VI) reduction process by oxalic acid was conducted. The existence of Cr(VI) in the reaction medium was measured by software Visual MINTEQ and the concentration of Cr(VI) was measured by ICP-OES. 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 results showed in this paper provided a versatile strategy for Cr(VI) reduction and exhibited a bright application future for real wastewater treatment.

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Step-Adsorption of Vanadium (V) and Chromium (VI) in the Leaching Solution with Melamine

Cited by 23 publications

References 46 publications

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

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

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

Reduction behavior of chromium(VI) with oxalic acid in aqueous solution

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