A sodium hyposulfite fuel cell for efficient Cr(VI) removal

Wang, Dongfang; Zong, Zhiqiang; Ye, Jinghong; Wu, Qingchuan; Zhang, Xiaojiang; Wu, Zhengyan; Zhang, Jing; Xu, He; Cai, Dongqing

doi:10.1016/j.chemosphere.2022.133803

Cited by 7 publications

(6 citation statements)

References 29 publications

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“…37 In Figure 8E,F, the typical peak of Na 2 S 2 O 3 could be found at 168.4 and 162.9 eV in S 2p, 167.7 and 161.7 eV in S 2p 3/2 , and 531.6 and 535.2 eV in O 1 s. 25 After the reaction (Figure 8G,H), the typical peak of SO 4 2− could be found at 168.9 eV in S 2p, 167.9 eV in S 2p 3/2 , and 531. . 27 Additionally, the peak of S 2p at 162.9 eV and the peak of S 2p 3/2 at 161.7 eV still existed in the Na 2 S 2 O 3 solution, elucidating that the reaction of S 2 O 3 2− was incomplete. Reuse Performance of GF/PPy/CNTs−COOH.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

“…Conversely, Cr(VI) RE increased with Na 2 S 2 O 3 solution pH from 4 to 10 (Figure F). It was likely because S 2 O 3 2– could occur disproportionation reaction at the acidic condition to produce S and SO 2 . According to reaction (5), S 2 O 3 2– could be reacted with OH – to produce electron, which was beneficial for Cr(VI) removal.…”

Section: Resultsmentioning

confidence: 99%

“…It was likely because S 2 O 3 2− could occur disproportionation reaction at the acidic condition to produce S and SO 2 . 27 According to reaction (5), S 2 O 3 2− could be reacted with OH − to produce electron, which was beneficial for Cr(VI) removal. Thus, the optimal pHs of the cathode and anode solutions were 2 and 10, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…First, GF (30 mm × 30 mm) was pretreated by HNO 3 aqueous solution according to the previously published method . Subsequently, CNTs–COOH (0.1 g) was added to deionized water (100 mL) and sonicated for 1 h. Then, 0.1 mL of pyrrole was added to the dispersive solution and stirred (900 rpm, 30 min).…”

Section: Methodsmentioning

confidence: 99%

“…First, GF (30 mm × 30 mm) was pretreated by HNO 3 aqueous solution according to the previously published method. 27 Subsequently, CNTs−COOH (0.1 g) was added to deionized water (100 mL) and sonicated for 1 h. Then, 0.1 mL of pyrrole was added to the dispersive solution and stirred (900 rpm, 30 min). Thereafter, 100 mL of H 2 O 2 (0.2 M) and 100 mL of FeSO 4 •7H 2 O (0.7 M) were added to the mixed solution orderly, and the resulting solution was stirred (1000 rpm, 12 h).…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Carbon Nanotubes-Based Fuel Cell for Cr(VI) Removal and Electricity Generation

Wang

Zong

et al. 2022

Langmuir

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A fuel cell, an energy transducer, can convert chemical energy into electrical energy. In this work, graphite felt (GF) loaded with polypyrrole (PPy) and carboxylic carbon nanotubes (CNTs–COOH) was used as a cathode (GF/PPy/CNTs–COOH) in a double-chamber nonbiofuel cell (D-nBFC) to remove Cr(VI) efficiently. Therein, Na2S2O3 in an alkaline solution and Cr(VI) in a strongly acidic solution were employed as anode and cathode solutions, respectively. An agar salt bridge, consisting of saturated KCl solution, was used to transport ions between the anode and cathode. This system suggested that the removal efficiency of Cr(VI) could reach 99.6%. The maximum current, power, and power density could achieve 136.8 μA, 18.7 μW, and 20.8 mW/m2 at 90 min, respectively. Additionally, GF/PPy/CNTs–COOH also had good electrocatalytic stability and reusability after four cycles, which played an important role in the development of the D-nBFC system. Therefore, this study provides an environmentally friendly and efficient method to remove Cr(VI) and generate electricity simultaneously.

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Section: ■ Results and Discussionmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

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