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首页> 外文期刊>RSC Advances >Visible light assisted improved photocatalytic activity of combustion synthesized spongy-ZnO towards dye degradation and bacterial inactivation
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Visible light assisted improved photocatalytic activity of combustion synthesized spongy-ZnO towards dye degradation and bacterial inactivation

机译：可见光辅助改善燃烧的光催化活性合成海绵ZnO朝向染料降解和细菌灭活

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Spongy ZnO photocatalysts were successfully synthesized by a simple, one-step solution combustion technique. The properties such as crystal structure, particle morphology and surface area were optimized through various processing parameters such as oxidizer to fuel ratio, combustion time and the temperature to control crystallinity, phase and yield. The stoichiometric oxidizer to fuel ratio was sufficient to develop a porous and spongy-ZnO nanopowder with a high surface area of 32.6 m ~(2) g ~(?1) . The primary particle size of ZnO was found to be ～60 nm with a band gap of 2.92 eV. The photocatalytic activity of the spongy-ZnO photocatalyst was determined by degrading a model dye, crystal violet under visible light irradiation as well as natural solar light. An antibacterial study was also performed with E. coli as model microorganism under visible light. The E. coli inactivation reaction order was found to be 1 and the rate constant with ZnO was 13.11 ± 0.4 h ~(?1) . Spongy-ZnO maintains high photocatalytic activity under solar light irradiation in comparison to P-25 TiO _(2) . The catalytic efficiency was maintained for five cycles under visible light irradiation. Low electron–hole pair recombination with increased efficiency was observed under solar light due to the strong absorption by the photocatalyst under both UV and visible light. The main active species responsible for catalytic degradation are h ~(+) and ˙OH. The probable catalytic mechanism was proposed from the experimentally derived results. The effect of hydrogen peroxide on the photochemical reaction was also studied for dye degradation as well as bacterial inactivation.
机译：通过简单的一步溶液燃烧技术成功地合成海绵状ZnO光催化剂。通过诸如氧化剂的各种加工参数优化晶体结构，颗粒形态和表面积，例如氧化剂，以控制结晶度，相和产率的燃料比，燃烧时间和温度优化。化学计量氧化剂与燃料比足以开发具有32.6m〜（2）g〜（α1）的高表面积的多孔和海绵ZnO纳米粉末。发现ZnO的初级粒径为〜60nm，带有2.92eV的带隙。通过降解可见光照射下的模型染料，晶体紫光以及天然太阳光，测定海绵ZnO光催化剂的光催化活性。还用大肠杆菌作为模型微生物在可见光下进行抗菌研究。发现大肠杆菌灭活反应顺序为1，ZnO的速率常数为13.11±0.4小时〜（？1）。与P-25 TiO_（2）相比，Spongy-ZnO在太阳光照照射下保持高光催化活性。在可见光照射下维持催化效率五个循环。由于光催化剂在UV和可见光下，在太阳光下观察到具有提高效率的低电极对重组。负责催化降解的主要活性物质是H〜（+）和˙OH。从实验衍生的结果提出了可能的催化机制。还研究了过氧化氢对光化学反应的影响，用于染料降解以及细菌灭活。

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