Visible-light-driven inactivation of Escherichia coli K-12 over thermal treated natural pyrrhotite

Xia, Dehua; Li, Yan; Huang, Guocheng; Fong, Chi Ching; An, Taicheng; Li, Guiying; Yip, Ho Yin; Zhao, Huijun; Lu, Anhuai; Wong, Po Keung

doi:10.1016/j.apcatb.2015.04.024

Cited by 53 publications

(8 citation statements)

References 41 publications

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“…Furthermore, Wong and co‐workers reported that a low‐cost natural mineral can be used for constructing a direct Z‐scheme heterojunction photocatalyst . Specifically, natural magnetic pyrrhotite (NP) mineral, after thermal treatment at 600 °C, was used as a photocatalyst.…”

Section: Direct Z‐scheme Heterojunctionsmentioning

confidence: 99%

Heterojunction Photocatalysts

et al. 2017

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Semiconductor-based photocatalysis attracts wide attention because of its ability to directly utilize solar energy for production of solar fuels, such as hydrogen and hydrocarbon fuels and for degradation of various pollutants. However, the efficiency of photocatalytic reactions remains low due to the fast electron-hole recombination and low light utilization. Therefore, enormous efforts have been undertaken to solve these problems. Particularly, properly engineered heterojunction photocatalysts are shown to be able to possess higher photocatalytic activity because of spatial separation of photogenerated electron-hole pairs. Here, the basic principles of various heterojunction photocatalysts are systematically discussed. Recent efforts toward the development of heterojunction photocatalysts for various photocatalytic applications are also presented and appraised. Finally, a brief summary and perspectives on the challenges and future directions in the area of heterojunction photocatalysts are also provided.

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Section: Direct Z‐scheme Heterojunctionsmentioning

confidence: 99%

Heterojunction Photocatalysts

et al. 2017

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“…It is also feasible to explore its application as a direct photonic source for photochemical processes. Additionally, photons provided by sunlight (mainly UV and VIS radiation; additionally NIR light in photocatalysis) can be absorbed by a semiconductor material, such as natural doped compounds, sulfide minerals, and transition metal oxides, which are obtained from the ore bodies [16][17][18][19][20], generating excited states that give rise to a sequence of photochemical reactions (photooxidation/photoreduction) that can be exploited to improve or assist the oxidative dissolution of these sulfide minerals and accelerate ferric iron/ferrous cycling [21,22].…”

Section: Global Trends In the Mining Industry: Renewable Power Sources And Solar Energymentioning

confidence: 99%

The Role of Solar Energy (UV-VIS-NIR) as an Assistant for Sulfide Minerals Leaching and Its Potential Application for Metal Extraction

et al. 2021

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The mining industry is facing emerging challenges as a result of the increase in energy consumption and environmental demands. These facts have promoted the use of renewable energy sources, such as wind, geothermal and, mainly, solar energy. This paper discusses the role of solar energy (UV-VIS-NIR) in leaching processes, evaluating its potential application in metal extraction from sulfide minerals, based on photochemical mechanisms that promote the regeneration of ferric iron or the so called ferrous iron cycling. The present paper discusses the possibility that ultraviolet, visible light and near infrared irradiation (e.g., sunlight provided) can assist the leaching processes in two main ways: by the oxidation of sulfide minerals through in-situ generated Fenton-like reactions, and by the photochemical activation of semiconductor minerals that contain transition metals (Fe, Cu, and Cr, among others). Thus, this paper provides theoretical support to move towards the future application of photoleaching, which consist of a leaching process assisted by UV, VIS, and NIR irradiation. This technology can be considered a promising mineral processing route, using direct photochemical solar energy that can reduce the energy consumption (electricity, fuels) and the environmental impact, opening an opportunity for an alternative method of metal extraction from sulfide ores.

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“…Noble silver nanoparticles (Ag NPs) have been practically utilized in several medical products because of their effective broad-spectrum antibacterial activity [7,8]. The antibacterial mechanism of Ag NPs is mainly attributed to the destruction of the cell membranes of pathogens under ambient conditions because of the Ag + ions released in the oxidization of Ag NPs [9,10]. However, a sudden and large release of Ag + ions induced by the uncontrollable oxidization behavior of Ag NPs may cause cell toxicity and impair their stability and usage in long-term applications, which may result in an environmental hazard and increased health safety risk [11].…”

Section: Introductionmentioning

confidence: 99%