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Sensors 2014, 14(6), 10680-10690; doi:10.3390/s140610680

WO3/W Nanopores Sensor for Chemical Oxygen Demand (COD) Determination under Visible Light

School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Rd, Shanghai 200240, China
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Received: 5 May 2014 / Revised: 28 May 2014 / Accepted: 4 June 2014 / Published: 17 June 2014
(This article belongs to the Special Issue Nanopore Sensors: Fabrications, Properties and Applications)
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Abstract

A sensor of a WO3 nanopores electrode combined with a thin layer reactor was proposed to develop a Chemical Oxygen Demand (COD) determination method and solve the problem that the COD values are inaccurately determined by the standard method. The visible spectrum, e.g., 420 nm, could be used as light source in the sensor we developed, which represents a breakthrough by limiting of UV light source in the photoelectrocatalysis process. The operation conditions were optimized in this work, and the results showed that taking NaNO3 solution at the concentration of 2.5 mol·L−1 as electrolyte under the light intensity of 214 μW·cm−2 and applied bias of 2.5 V, the proposed method is accurate and well reproducible, even in a wide range of pH values. Furthermore, the COD values obtained by the WO3 sensor were fitted well with the theoretical COD value in the range of 3–60 mg·L−1 with a limit value of 1 mg·L−1, which reveals that the proposed sensor may be a practical device for monitoring and controlling surface water quality as well as slightly polluted water. View Full-Text
Keywords: WO3 sensor; visible light; COD WO3 sensor; visible light; COD
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Li, X.; Bai, J.; Liu, Q.; Li, J.; Zhou, B. WO3/W Nanopores Sensor for Chemical Oxygen Demand (COD) Determination under Visible Light. Sensors 2014, 14, 10680-10690.

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