Photocurrent multiplication at n-GaN electrodes in formic acid solutions

Huygens, Inge; Gomes, W. P.; Strubbe, Katrien

doi:10.1016/j.electacta.2004.11.041

Electrochimica Acta

2005

DOI: 10.1016/j.electacta.2004.11.041

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Photocurrent multiplication at n-GaN electrodes in formic acid solutions

Inge Huygens

W. P. Gomes

Katrien Strubbe

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2024

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Antagonistic Effect of Nitrate Conversion on Photocatalytic Reduction of Aqueous Pertechnetate and Perrhenate

Chen,

Deng,

Liang

et al. 2024

Environ. Sci. Technol.

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Sustainable photocatalysis can effectively reduce the radioactive 99 TcO 4 − to less soluble TcO 2 •nH 2 O(s), but the reduction efficiency is highly susceptible to coexisting nitrate (NO 3 − ). Here, we quantitatively investigate photocatalytic remediation conditions for Tc-contaminated water stimulated by the analogue perrhenate (ReO 4 − ) in the presence of NO 3 − , and we elucidate the influence mechanism of NO 3 − by in situ characterizations. The interfering NO 3 − can compete with Re(VII) for the carbonyl radical (•CO 2 − ) produced by formic acid (HCOOH) oxidation to generate nitrogen-containing products such as NH 4 + , NO 2− , and NO x , resulting in the decrease in the Re(VII) reduction ratio. Under the conditions of 4% (volume ratio) HCOOH and pH = 3, the yield of NO x is the lowest, and the selectivity of N 2 reaches 93%, which makes the overall reaction more in line with the pollution-free concept. The X-ray absorption fine structure reveals that the redox product Re(IV) mainly exists in the form of ReO 2 •nH 2 O(s) and is accompanied by a decrease with the increase in NO 3 − concentration. Re(VII)/Tc(VII) reduction suffers from a serious interferential effect of NO 3 − , whereas the higher the concentration of NO 3 − , the more conducive to slowing down the reoxidation of the reduction products, which is advantageous for the subsequent sequestration or separation.

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Antagonistic Effect of Nitrate Conversion on Photocatalytic Reduction of Aqueous Pertechnetate and Perrhenate

Chen,

Deng,

Liang

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

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Photocurrent multiplication at n-GaN electrodes in formic acid solutions

Cited by 1 publication

References 11 publications

Antagonistic Effect of Nitrate Conversion on Photocatalytic Reduction of Aqueous Pertechnetate and Perrhenate

Antagonistic Effect of Nitrate Conversion on Photocatalytic Reduction of Aqueous Pertechnetate and Perrhenate

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