Photoelectrocatalytic microreactor for seawater decontamination with negligible chlorine generation

Wang, Ning; Tan, Furui; Tsoi, Chi Chung; Zhang, Xuming

doi:10.1007/s00542-016-3193-8

Cited by 11 publications

(6 citation statements)

References 17 publications

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“…Microfluidic devices have intrinsic merits such as large surface area, high mass transfer, and easy integration [8][9][10][11] and thus have been widely developed for micro total analysis in rapid diagnosis 12 and water treatment. 13 Because of light, fluid, and its interaction involved, online monitoring of water quality using absorption spectrometry is a natural optofluidic system.…”

Section: Introductionmentioning

confidence: 99%

Optofluidic Platform for Rapid On-Chip Analysis of Total Phosphorus in Surface Water Using Absorption Spectrometry

et al. 2022

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Optofluidic devices are of high interest for online monitoring and analyzing biochemical targets in water by integrating the complex on-chip pretreatment of target analytes and spectral analysis. Compared with the traditional bulk equipment, versatile optical detection and biochemical analysis are more easily integrated on an optofluidic chip, which promotes the development of on-chip real-time rapid detection and monitoring. Here, we report an optofluidic platform for online monitoring total phosphorous in water by absorption spectrometry, which naturally combines the merits of both the photo-Fenton effect and microfluidics to realize the rapid on-chip digestion of phosphate at room temperature and normal pressure. The functional cells for chromogenic reaction and optical absorption detection are respectively fabricated on the platform to analyze the content of total phosphorus in surface water. In the experiment, the on-chip digestion time of phosphate is dramatically declined to 8.6 seconds and thus the detection time is greatly shortened to a few minutes. The detection range of total phosphorus is demonstrated as 0.005–1.00 mg/L, which satisfies the detection requirements of most environmental water samples. Its availability for measuring the total phosphorous in real water samples is also verified. Predictably, this platform is adapted to on-chip analyze many other biochemical targets in water.

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Section: Introductionmentioning

confidence: 99%

Optofluidic Platform for Rapid On-Chip Analysis of Total Phosphorus in Surface Water Using Absorption Spectrometry

et al. 2022

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“…Phosphorus is one of the indispensable nutrients for all kinds of natural water. However, excessive phosphorus in water will cause eutrophication and seriously deteriorate the ecological environment [1][2][3]. Therefore, monitoring of total phosphate in surface water, sewage and industrial wastewater has become a focus all over the world.…”

Section: Introductionmentioning

confidence: 99%

An Integrated Optofluidic Platform Enabling Total Phosphorus On-Chip Digestion and Online Real-Time Detection

et al. 2020

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This paper presents a total phosphorus online real-time monitoring system integrated with on-chip digestion based on the merits of optofluidic technology. The integrated optofluidic device contains a hollow optical fiber employed for pretreatment and digestion of phosphorus solution samples, a polydimethylsiloxane (PDMS)-based micromixer with convergent–divergent walls designed to enable sufficient mixing and chromogenic reaction, and a couple of optical fiber collimators attached with a Z-shaped flow cell for optical detection. Details of system design and fabrication are introduced in this paper. In the experiment, on-chip digestion of four typical phosphates in aqueous solution including organophosphorus and inorganic phosphorus is investigated under different reaction conditions, such as digestion temperature, concentration of oxidant and pH value, and the optimal reaction parameters are explored under different conditions. Meanwhile, we demonstrate the online real-time monitoring function of the optofluidic device, and the digestion mechanisms of four different phosphates are analyzed and discussed. Compared with the national standard method, we find that the measurement accuracy and sensitivity are acceptable when the concentration of total phosphorus is between 0.005–0.9 mg/L (by weight of P) in aqueous solution, which covers the range defined in the national standard. The traditional digestion time of several hours is greatly reduced to less than 10 s, and the content of total phosphorus can be obtained in a few minutes. The integrated optofluidic device can significantly shorten the test time and reduce the sample amount, and also provides a versatile platform for the real-time detection and analysis of many biochemical samples.

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“…Optofluidics, which integrate synergistically photonics and microfluidics, shows the advantages of small size, high integration, and low power/reagent consumption . Optofluidics have inspired numerous on-chip devices with enhanced performance, , such as waveguides, , switches, transformation optics, , and biochemical sensors. − Previous studies demonstrated these advantages by directly inserting the modules into a microfluidic chip for colorimetric analysis.…”

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confidence: 99%

Amplitude Holographic Interference-Based Microfluidic Colorimetry at the Micrometer Scale

Shi

Zuo

et al. 2020

J. Phys. Chem. Lett.

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Quantitative molecular analysis is usually based on spectrophotometric methods using colorimetric assay. Conventional methods, however, rely on the direct uniform absorption of the sample under test, and the detection sensitivity is strictly limited by the length of the absorption cell at the millimeter scale. Here, we report a new methodology for colorimetric assay based on the amplitude holographic interference (AHI) caused by nonuniform absorption of light, with detection sensitivity at the micrometer scale. In our method, the curved surface of the microfluidics results in a phase profile with a high diffraction efficiency, and the nonuniform absorption of samples exactly matches with the amplitude modulation in the holographic interference. The signal intensity is affected by not only direct sample absorption but also the sequential optical interference behind the liquid level. Both single- and multiple-wavelength colorimetric analyses of the Griess–Saltzman dye (GSD) were carried out using this method, and we found that the sensitivity can be improved by approximately 2-fold in comparison to the conventional method. This interference-based method would be a useful tool for the colorimetric assay of chemical samples in highly integrated systems with better performance.

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Photoelectrocatalytic microreactor for seawater decontamination with negligible chlorine generation

Cited by 11 publications

References 17 publications

Optofluidic Platform for Rapid On-Chip Analysis of Total Phosphorus in Surface Water Using Absorption Spectrometry

Optofluidic Platform for Rapid On-Chip Analysis of Total Phosphorus in Surface Water Using Absorption Spectrometry

An Integrated Optofluidic Platform Enabling Total Phosphorus On-Chip Digestion and Online Real-Time Detection

Amplitude Holographic Interference-Based Microfluidic Colorimetry at the Micrometer Scale

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