Photocatalytic optical fibers for degradation of organic pollutants in wastewater: a review
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REVIEW
Photocatalytic optical fibers for degradation of organic pollutants in wastewater: a review Yongwu Wu1 · Lanlan Zhong1 · Jilin Yuan1 · Wenhao Xiang1 · Xin Xin1 · Huimin Liu1 · Hongyang Luo1 · Linyang Li1 · Ming Chen1 · Dengjie Zhong2 · Xinghong Zhang3 · Nianbing Zhong1,3 · Haixing Chang2 Received: 22 October 2020 / Accepted: 11 November 2020 © Springer Nature Switzerland AG 2020
Abstract Photocatalytic optical fibers are promising materials for degrading organic pollutants in wastewater, owing to their low light mass transfer resistance, their high efficiency of light utilization, and their inhibition of photocatalyst deactivation. In particular, optical fibers have been applied for the removal of phenols, dyes, organic acids and antibiotics in wastewater. Yet, optical fibers have limitations such as poor photocatalytic activity and low sustainability. Here, we review the principle and use of photocatalytic optical fibers, including photocatalytic quartz and plastic optical fibers, for the degradation of the organic pollutants in water. We present methods to enhance photocatalytic activity, light utilization efficiency, and adhesion strength by using TiO2-based photocatalytic coatings. Keywords Photocatalytic optical fibers · TiO2-based photocatalytic coating · Organic pollutants · Wastewater · Photocatalytic degradation · Photocatalytic activity
Introduction Although industries have modernized and advanced, our environment is affected by various types of pollutants, such as liquid-, gaseous-, and solid-phase contaminants, emitted from human activities and industrial processes (Li et al. 2015; Madima et al. 2020; Saravanan et al. 2020a). Among Yongwu Wu, Lanlan Zhong, and Jilin Yuan have contributed equally. * Nianbing Zhong [email protected] * Haixing Chang [email protected] 1
Intelligent Fiber Sensing Technology of Chongqing Municipal Engineering Research Center of Institutions of Higher Education, Chongqing Key Laboratory of Modern Photoelectric Detection Technology and Instrument, Chongqing Key Laboratory of Fiber Optic Sensor and Photodetector, Chongqing University of Technology, Chongqing 400054, China
2
School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China
3
Liangjiang International College, Chongqing University of Technology, Chongqing 400054, China
the contaminants, the pollution of water is an issue that requires an immediate resolution, owing to a drastic decrease in the availability of clean freshwater resources caused by an increase in water pollution by manufacturing and industrial production, to sustain the current and future life (Crini et al. 2019a; Gavrilescu et al. 2015; He et al. 2020; Nithya et al. 2020). Furthermore, as the water consumption increases owing to the growing population, it is forecasted that the demand for a water source by 2030 will rise by 40% as compared to that of the current demand (Deng et al. 2020). Thus, it is necessary to remove the contaminants in water prior to its utilization. Photo
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