Short-wavelength III-V LEDs and their applications

Uemura, Taku; Shibata, Naoki; Yamaguchi, Hisao; Yasukawa, T.

doi:10.1117/12.476560

Cited by 2 publications

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“…With the advent of the next‐generation lighting industry, light emitting diodes (LEDs), featured by many unique advantages such as high energy efficiency, environment‐friendliness (Hg free), small size (no special circuit), and long lifetime, showed promises in the green and sustainable application to the water treatment (Malkhasian, Izadifard, Achari, & Langford, 2014; Uemura, Shibata, Yamaguchi, & Yasukawa, 2003; Wang, Srivastava, Ambat, Safaei, & Sillanpää, 2019). In addition, the direct adoption of LED without warmup enables more resilient applications in continuous water treatment.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient chloramphenicol degradation by UV and UV/H₂O₂ processes based on LED light source

Tang

Liu

et al. 2020

Water Environment Research

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In this study, UV-LED was employed as a novel light source to investigate the degradation of a representative antibiotic compound, chloramphenicol (CAP), in the absence or presence of H 2 O 2. The UV-LED irradiation showed a higher capability for degradation of CAP than conventional UV-Hg vapor lamps. Effects of the initial CAP concentration, UV wavelength, and light intensity on the degradation of CAP by UV-LED were evaluated. Introduction of H 2 O 2 evidently enhanced the degradation efficiency of CAP due to the production of reactive hydroxyl radicals. Results showed that the UV-LED/H 2 O 2 removed CAP by up to 95% within 60 min at pH 5.0, which was twice as that achieved by the UV-LED alone. The degradation products were identified to propose plausible degradation pathways. Moreover, the formation potentials of typical carbonaceous disinfection by-products (C-DBPs) and nitrogenous disinfection by-products (N-DBPs) were assessed for the CAP polluted water treated by the UV-LED alone and UV-LED/H 2 O 2 processes. Results indicate unintended formation of certain DBPs, thereby highlighting the importance of health risk assessments before practical application. This study opens a new avenue for developing environment-friendly and high-performance UV-LED photocatalytic reactors for abatement of CAP pollution in water. © 2020 Water Environment Federation • Practitioner points • UV-LED bore higher capability to degrade CAP than low-pressure Hg lamp. • The optimal performance to degrade CAP can be achieved at the UV wavelength of 280 nm. • The degradation efficiency under UV-LED/H 2 O 2 process was double of that under UV-LED process. • TCM, DCAN, and TCNM formation were higher under the existence of UV-LED radiation. • The addition of H 2 O 2 had greater influence on the formation of DCAcAm than the introduction of UV-LED.

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Section: Introductionmentioning

confidence: 99%

Highly efficient chloramphenicol degradation by UV and UV/H₂O₂ processes based on LED light source

Tang

Liu

et al. 2020

Water Environment Research

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Photocatalytic degradation of Reactive Red 22 in aqueous solution by UV-LED radiation

Wang

2006

Water Research

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Short-wavelength III-V LEDs and their applications

Cited by 2 publications

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Highly efficient chloramphenicol degradation by UV and UV/H₂O₂ processes based on LED light source

Highly efficient chloramphenicol degradation by UV and UV/H₂O₂ processes based on LED light source

Photocatalytic degradation of Reactive Red 22 in aqueous solution by UV-LED radiation

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Short-wavelength III-V LEDs and their applications

Cited by 2 publications

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Highly efficient chloramphenicol degradation by UV and UV/H2O2 processes based on LED light source

Highly efficient chloramphenicol degradation by UV and UV/H2O2 processes based on LED light source

Photocatalytic degradation of Reactive Red 22 in aqueous solution by UV-LED radiation

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Highly efficient chloramphenicol degradation by UV and UV/H₂O₂ processes based on LED light source

Highly efficient chloramphenicol degradation by UV and UV/H₂O₂ processes based on LED light source