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      Synthesis and Stabilization of Blue-Black TiO2 Nanotube Arrays for Electrochemical Oxidant Generation and Wastewater Treatment.

      1 , 1
      Environmental science & technology
      American Chemical Society (ACS)

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          Abstract

          Efficient, inexpensive, and stable electrode materials are key components of commercially viable electrochemical wastewater treatment system. In this study, blue-black TiO2 nanotube array (BNTA) electrodes are prepared by electrochemical self-doping. The 1-D structure, donor state density, and Fermi energy level position are critical for maintaining the semimetallic functionality of the BNTA. The structural strength of the BNTA is enhanced by surface crack minimization, reinforcement of the BNTA-Ti metal interface, and stabilized by a protective overcoating with nanoparticulate TiO2 (Ti/EBNTA). Ti/EBNTA electrodes are employed as both anodes and cathodes with polarity switching at a set frequency. Oxidants are generated at the anode, while the doping levels are regenerated along with byproduct reduction at the cathode. The estimated maximum electrode lifetime is 16 895 h. Ti/EBNTA has comparable hydroxyl radical production activity (6.6 × 10-14 M) with boron-doped diamond (BDD, 7.4 × 10-14 M) electrodes. The chlorine production rate follows a trend with respective to electrode type of Ti/EBNTA > BDD > IrO2. Ti/EBNTA electrodes operated in a bipolar mode have a minimum energy consumption of 62 kWh/kg COD, reduced foam formation due to less gas bubble production, minimum scale formation, and lower chlorate production levels (6 mM vs 18 mM for BDD) during electrolytic wastewater treatment.

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          Author and article information

          Journal
          Environ. Sci. Technol.
          Environmental science & technology
          American Chemical Society (ACS)
          1520-5851
          0013-936X
          November 01 2016
          : 50
          : 21
          Affiliations
          [1 ] Linde + Robinson Laboratories California Institute of Technology 1200 E. California Blvd. MC 131-24 Pasadena, California 91125, United States.
          Article
          10.1021/acs.est.6b03540
          27648479
          9aee4b8d-69de-48ee-b5c2-776e23674792
          History

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