Efficient photocatalytic degradation of antibiotic levofloxacin and organic pollutants in water by Pr doped ZnO nanorods

IF 3.8 Q2 CHEMISTRY, PHYSICAL Chemical Physics Impact Pub Date : 2024-07-14 DOI:10.1016/j.chphi.2024.100687
Shipra Choudhary, Satyabrata Mohapatra
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Abstract

Doping is a promising route to improve photodegradation performance of wide bandgap semiconductors and has drawn attention for the fabrication of efficient sun light driven photocatalysts. We have reported a simple wet chemical fabrication of Pr doped ZnO nanorods with strong photodegradation efficiency in the decolorization of organic pollutants such as synthetic dyes and antibiotic levofloxacin. The influence of Pr doping on the structure, lattice parameters and morphology of nanostructured ZnO were investigated via XRD, Raman spectroscopy and FESEM, while PL and UV–visible spectroscopy were employed to study the optical absorption and photocatalytic response. The results revealed that Pr+3 ions are successfully substituted in ZnO lattice and band gap of the doped ZnO photocatalysts shifted slightly to the visible region. Photocatalytic capability of ZnO nanostructures was significantly improved upon Pr doping and amongst all 0.5 % Pr doped ZnO nanorods exhibited superior photodegradation ability under sunlight illumination. The enhanced photodegradation performance is attributed to improved light utilization, high defect concentration and effective separation of photoinduced charge carriers. The degradation mechanism along with the scavenger trapping experiments has been proposed which showed that hydroxyl radicals are the dominating active species involved in the decomposition of pollutant.

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掺杂镨的氧化锌纳米棒对水中抗生素左氧氟沙星和有机污染物的高效光催化降解
掺杂是提高宽带隙半导体光降解性能的一种有前途的途径,并已引起人们对制造高效太阳光驱动光催化剂的关注。我们报道了一种简单的湿化学法制备掺杂 Pr 的氧化锌纳米棒的方法,这种纳米棒在脱色合成染料和抗生素左氧氟沙星等有机污染物时具有很强的光降解效率。通过 XRD、拉曼光谱和 FESEM 研究了掺杂 Pr 对纳米结构 ZnO 的结构、晶格参数和形貌的影响,并利用 PL 和紫外可见光谱研究了其光学吸收和光催化响应。结果表明,Pr+3 离子成功地取代了 ZnO 晶格,掺杂 ZnO 光催化剂的带隙略微向可见光区移动。掺杂 Pr 后,氧化锌纳米结构的光催化能力显著提高,其中 0.5 % 的掺杂 Pr 氧化锌纳米棒在阳光照射下表现出卓越的光降解能力。光降解性能的增强归因于光利用率的提高、高缺陷浓度和光诱导电荷载流子的有效分离。降解机理和清除剂捕获实验表明,羟基自由基是参与污染物分解的主要活性物种。
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来源期刊
Chemical Physics Impact
Chemical Physics Impact Materials Science-Materials Science (miscellaneous)
CiteScore
2.60
自引率
0.00%
发文量
65
审稿时长
46 days
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