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ZnO and Co-ZnO nanorods-Complementary role of oxygen vacancy in photocatalytic activity of under UV and visible radiation flux

机译：ZnO和Co-ZnO纳米棒-氧空位在紫外和可见光通量下对光催化活性的补充作用

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摘要

Enhancement in photoactivity of zinc oxide, a UV active photocatalyst, can be achieved through nanos-tructuration 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 440nm:120nm and 1460 nm:162 ran, 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.
机译：除掺杂引起的吸收光谱红移外，还可以通过纳米结构提高氧化锌（一种紫外线活性光催化剂）的光活性。为此，通过水热法合成了钴掺杂的ZnO（Co-ZnO）的纳米棒。如预期的那样，与原始合成的原始ZnO纳米棒相比，Co-ZnO纳米棒在可见光通量下对亚甲基蓝染料（MB）和苯酚的降解表现出较高的光催化活性。 XRD，SEM，TEM，EDX，UV-DRS，PL和FTIR研究用于表征光催化剂。 ZnO和Co-ZnO均具有纤锌矿相的ZnO，其纳米棒的形态分别为长度：直径440nm：120nm和1460nm：162nm。出人意料的是，在紫外光下，ZnO-纳米脚比Co-ZnO具有更多的活性。当与掺杂剂引起的氧空位的猝灭相关时，这些相反的结果表明氧空位在材料的光活性中具有互补作用，在吸收光谱中具有带隙辅助红移的主要作用。

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