Photocatalytic nitrogen-oxide conversion in red soil

Gan, Yunhua; Abdellatif, Hassan R.S.; Zhang, Jing; Wan, Yanshan; Zeng, Qimiao; Chen, Jingwen; Ni, Jiupai; Zhang, Yang; Shengzhe, E; Ni, Chengsheng

doi:10.1016/j.jclepro.2021.129377

Cited by 13 publications

(7 citation statements)

References 62 publications

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“…When sunlight hits a semiconductor, photons with energy greater than the forbidden bandwidth can excite the electrons (e − ) in the valence band to the conduction band to leave a positively charged hole (h + ). Electrons and electron holes direct contact with oxygen and water molecules producing reactive oxygen species and hydroxyl radicals, stimulating a series of redox reactions ( Gan et al, 2021 ; Li et al, 2021 ). Semiconductor mineral photocatalysis mediated redox reactions are widely used in solution systems ( Luo et al, 2017 ), but their mechanisms within a soil system remain ambiguous.…”

Section: Discussionmentioning

confidence: 99%

“…A possible mechanism was that soil particles from the samples contained many metallic oxides and other semiconductor minerals. When sunlight hits these semiconductor minerals, an electron–hole pair with strong oxidation–reduction abilities was excited ( Liu et al, 2019 ; Gan et al, 2021 ). Our results showed that photo-electrons and photo-holes were separated within a certain period, and direct contact with oxygen and water molecules produced reactive oxygen species and hydroxyl radicals resulting in the production of effective photoelectrons that initiated a series of redox reactions that transmitted energy through the electron transport chain ( Fan et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…Most metallic oxides are semiconductor minerals that form a thin coating on the earth’s surface, have photoelectric conversion capabilities, and provide a driving force for redox geochemistry on the earth’s surface through photon-to-electron conversions ( Lu et al, 2019b ). These inorganic minerals inducing photo catalytic processes have been observed in red soil, which could convert extraneous NO under visible light ( Gan et al, 2021 ). Metallic oxides may also directly impact carbon cycles.…”

Section: Introductionmentioning

confidence: 99%

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Soil Respiration of Paddy Soils Were Stimulated by Semiconductor Minerals

Bai

Wang

et al. 2022

Front. Plant Sci.

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Large quantities of semiconductor minerals on soil surfaces have a sensitive photoelectric response. These semiconductor minerals generate photo-electrons and photo-hole pairs that can stimulate soil oxidation–reduction reactions when exposed to sunlight. We speculated that the photocatalysis of semiconductor minerals would affect soil carbon cycles. As the main component of the carbon cycle, soil respiration from paddy soil is often ignored. Five rice cropping areas in China were chosen for soil sampling. Semiconductor minerals were measured, and three main semiconductor minerals including hematile, rutile, and manganosite were identified in the paddy soils. The identified semiconductor minerals consisted of iron, manganese, and titanium oxides. Content of Fe2O3, TiO2, and MnO in the sampled soil was between 4.21–14%, 0.91–2.72%, and 0.02–0.22%, respectively. Most abundant semiconductor mineral was found in the DBDJ rice cropping area in Jilin province, with the highest content of Fe2O3 of 14%. Soils from the five main rice cropping areas were also identified as having strong photoelectric response characteristics. The highest photoelectric response was found in the DBDJ rice cropping area in Jilin province with a maximum photocurrent density of 0.48 μA/cm2. Soil respiration was monitored under both dark and light (3,000 lux light density) conditions. Soil respiration rates in the five regions were (from highest to lowest): DBDJ > XNDJ > XBDJ > HZSJ > HNSJ. Soil respiration was positively correlated with semiconductor mineral content, and soil respiration was higher under the light treatment than the dark treatment in every rice cropping area. This result suggested that soil respiration was stimulated by semiconductor mineral photocatalysis. This analysis provided indirect evidence of the effect semiconductor mineral photocatalysis has on the carbon cycle within paddy soils, while exploring carbon conversion mechanisms that could provide a new perspective on the soil carbon cycle.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Soil Respiration of Paddy Soils Were Stimulated by Semiconductor Minerals

Bai

Wang

et al. 2022

Front. Plant Sci.

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“…It can be seen that the influences of semiconductor minerals on soil carbon cycle are widely present, and their main mechanisms are the photocatalysis of semiconductor minerals under visible light irra-diation [32]. The photocatalysis of semiconductor minerals on soil surface not only affects soil carbon cycle but also has an important impact on nitrogen oxide conversion [33]. It can be inferred that in the near future, breakthroughs are expected to be made in technology for greenhouse gas emission mitigation using semiconductor minerals, so they are expected to play an important role in reducing greenhouse gas emissions from farmland ecosystems.…”

Section: Ghg Emission Dynamics and Their Potential Relationship With ...mentioning

confidence: 99%

Manganese Slag Amendment Reduces Greenhouse Gas Emissions from Paddy Soil

et al. 2023

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Increasing crop productivity and minimizing greenhouse gas emissions from paddy fields are increasingly receiving attention. Slag application not only can maximize the use of solid wastes as beneficial resources for agricultural production, but it also reduces greenhouse gas emissions. In order to determine the most effective slags as soil amendments for greenhouse gas emission reduction, three major slags, i.e., steel, titanium and manganese slags, were applied as soil amendments to paddy soils; correspondingly, the greenhouse gas emissions, cumulative emissions and global warming potential of the soils during one growing season were measured. It was found that applying all these three slags could reduce the methane emission rates and the cumulative methane emissions. Manganese slag significantly decreased methane emissions by 55% compared with the control. Carbon dioxide caused no significant changes among different slag treatments; however, the cumulative carbon dioxide emissions from fields treated with steel and manganese slags were lower than those from control fields. The global warming potential of paddy soil with manganese application was 63% lower than that of the control. Finally, manganese oxide was found to have a negative relation with greenhouse gas emissions. It was inferred that the electron acceptors and the photocatalysis of manganese oxide minerals might have been the main reasons for greenhouse gas reduction. This preliminary result could be further applied to utilizing solid wastes as beneficial resources and to developing carbon fixation and greenhouse gas reduction fertilizers.

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“…1,2 As some of the main pollutants of air, nitrogen oxides are mainly produced by the combustion process of fossil fuels such as automobile exhaust and thermal power. [3][4][5] Nitrogen oxides not only cause damage to the human respiratory tract, but also cause cancer in severe cases. They are also important substances leading to acid rain and photochemical smog.…”

Section: Introductionmentioning

confidence: 99%