ZnO and Co-ZnO nanorods-Complementary role of oxygen vacancy in photocatalytic activity of under UV and visible radiation flux
ZnO and Co-ZnO nanorods-Complementary role of oxygen vacancy in photocatalytic activity of under UV and visible radiation flux
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DOI：
10.1016/j.mseb.2013.11.013
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发表时间：
2014-03-01
影响因子：
3.6
通讯作者：
Samdarshi, S. K.
中科院分区：
文献类型：
--
作者：
Rajbongshi, Biju Mani;Samdarshi, S. K.
氧化锌是一种具有紫外光活性的光催化剂，除了掺杂诱导吸收光谱的红移外，还可以通过纳米结构化来提高其光催化活性。为此，采用水热法合成了钴掺杂氧化锌（Co-ZnO）纳米棒。正如预期的那样，Co-ZnO纳米棒显示出较高的光催化活性，在降解亚甲基蓝染料（MB）和苯酚的可见光辐射通量相比，原始的ZnO纳米棒，合成相同。采用XRD、SEM、TEM、EDX、UV-DRS、PL和FTIR等手段对催化剂进行了表征。ZnO和Co-ZnO都具有ZnO的纤锌矿相，其纳米棒形态分别具有440 nm：120 nm和1460 nm：162 nm的长度：直径。令人惊讶的是，在UV光下，ZnO纳米棒显示出比Co-ZnO更高的活性。这些对比的结果，当与掺杂剂诱导的猝灭的氧空位，向互补作用的氧空位的光活性的材料的吸收光谱中的带隙辅助红移的主导作用表示。(C)2013爱思唯尔有限公司版权所有。
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.