Photocatalytic degradation of agricultural antibiotics using a UV-LED light source

Malkhasian, Aramice Y. S.; Izadifard, Maryam; Achari, Gopal; Langford, Cooper H.

doi:10.1080/03601234.2013.836871

Cited by 19 publications

(7 citation statements)

References 35 publications

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“…Also, one of the meaningful advantages is that they do not generate mercury waste and therefore there is no necessity for special disposal of used lamps [20,26]. Photocatalytic degradation using LED lamps applied for pharmaceutical removal under described conditions was satisfactory compared to previous research studying pharmaceutical degradation with LED lamps [27,28,29,30]. Conversely, compared to experiments with the same conditions (SE and pH 10), which included an Hg based 254 nm lamp, the degradation of both compounds was slower.…”

Section: Discussionmentioning

confidence: 98%

Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

et al. 2019

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In this paper, nanostructured TiO2 film was prepared by the by sol-gel process and dip-coating technique with titanium tetraisopropoxide as a precursor. After heat treatment at 550 °C, the deposited film was characterized by means of micro-Raman spectroscopy and atomic force microscopy (AFM). It was found that the TiO2 film consisted of only the TiO2 anatase phase and showed a granular microstructure. Photocatalytic degradation of azithromycin by using sol-gel nanostructured TiO2 film was studied to define the most effective degradation process for potential use in wastewater treatment. Different factors were evaluated during photocatalysis, such as pH (3, 7, and 10), water matrix (ultrapure water and synthetic municipal waste water effluent), influence of another pharmaceutically active compound (sulfamethoxazole, one of the most often detected pharmaceutic compounds in waste waters), and radiation sources (low pressure ultraviolet (UV) mercury lamps with a UV-A and UV-C range; a light-emitting diode (LED) lamp with a radiation peak at 365 nm). The most effective degradation process was achieved with the UV-C irradiation source in matrices at pH 10. The water matrix had little effect on the photocatalytic degradation rates of azithromycin. The presence of sulfamethoxazole in the water matrix decreased the degradation rate of azithromycin, however, only in matrices with a pH level adjusted to 10. During the experiments, five azithromycin degradation products were identified and none of them showed toxic properties, suggesting effective removal of azithromycin. LED 365 nm as the irradiation source was not as effective as the UV-C lamp. Nevertheless, considering the cost, energy efficiency, and environmental aspects of the irradiation source, the LED lamp could be a “real-life” alternative.

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Section: Discussionmentioning

confidence: 98%

Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

et al. 2019

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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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“…Reached a 100% degradation of total organic carbon with cumulative energy of about 12.5 kJ/L [115]. Acetonitrile degradation in Green blue and red LED photoreactor with C-N TiO 2 .…”

Section: Application Of Traditional Photoreactors and Leds In Mining mentioning

confidence: 99%

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

et al. 2019

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For gold extraction, the most used extraction technique is the Merrill-Crow process, which uses lixiviants as sodium or potassium cyanide for gold leaching at alkaline conditions. The cyanide ion has an affinity not only for gold and silver, but for other metals in the ores, such as Al, Fe, Cu, Ni, Zn, and other toxic metals like Hg, As, Cr, Co, Pb, Sn, and Mn. After the extraction stage, the resulting wastewater is concentrated at alkaline conditions with concentrations up to 1000 ppm of metals. Photocatalysis is an advanced oxidation process (AOP) able to generate a photoreaction in the solid surface of a semiconductor activated by light. Although it is well known that photocatalytic processes can remove metals in solution, there are no compilations about the researches on photocatalytic removal of metals in wastewater with cyanide. Hence, this review comprises the existing applications of photocatalytic processes to remove metal and in some cases recover cyanide from recalcitrant wastewater from gold extraction. The use of this process, in general, requires the addition of several scavengers in order to force the mechanism to a pathway where the electrons can be transferred to the metal-cyanide matrices, or elsewhere the entire metallic cyanocomplex can be degraded by an oxidative pathway.

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Photocatalytic degradation of agricultural antibiotics using a UV-LED light source

Cited by 19 publications

References 35 publications

Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

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

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

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Photocatalytic degradation of agricultural antibiotics using a UV-LED light source

Cited by 19 publications

References 35 publications

Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

Photocatalytic Degradation of Azithromycin by Nanostructured TiO2 Film: Kinetics, Degradation Products, and Toxicity

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

Recent Developments in the Photocatalytic Treatment of Cyanide Wastewater: An Approach to Remediation and Recovery of Metals

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