Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 182, Issue -, Pages 21-28Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mseb.2013.11.013
Keywords
Hydrothermal method; Co-ZnO; Photocatalysis
Funding
- DST, New Delhi (India)
- AICTE, New Delhi (India)
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Enhancement in photoactivity of zinc oxide, a UV active photocatalyst, can be achieved through nanostructuration in addition to doping induced red-shift in absorption spectrum. For this, nanorods of cobalt-doped-ZnO (Co-ZnO) were synthesized by hydrothermal method. As expected, Co-ZnO nanorods showed high photocatalytic activity in degradation of methylene blue dye (MB) and phenol under visible radiation flux compared to pristine ZnO nano-rods, synthesized identically. XRD, SEM, TEM, EDX, UV-DRS, PL and FTIR studies were used to characterize the photocatalysts. ZnO and Co-ZnO, both had wurtzite phase of ZnO with nano-rod morphology having length:diameter of 440 nm:120 nm and 1460 nm:162 nm, respectively. Surprisingly, under UV light the ZnO-nanorods showed more activity than Co-ZnO. These contrasting results, when correlated with dopant-induced quenching of oxygen vacancies, indicated toward complementary role of oxygen vacancy in the photoactivity of the materials with the dominant role of band gap-assisted red-shift in the absorption spectrum. (C) 2013 Elsevier B.V. All rights reserved.
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