Synergistic effect of anisotropic ZnO nanoparticle shape on its photocatalytic performance for drug degradation in water

IF 1.9 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sukesh Kashiram Tumram, Rajdip Bandyopadhyaya
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Abstract

Increasing environmental issues have emerged due to various pharmaceutical wastes. These wastes are difficult to remove by treatment due to their continuous consumption and long-term persistence. We have synthesized two different shapes of zinc oxide (ZnO) nanoparticles as catalysts—nanorod (ZnO–NR) and oval-shape (ZnO–OS). A comparative performance of these two catalyst shapes on photocatalytic degradation of rifampicin (RIF) in water—a first-line anti-tuberculosis drug, was carried out. ZnO–NR showed three times higher normalized first-order degradation rate constant of RIF under UV light than that with ZnO–OS. This is due to: (i) specific surface area and specific pore volume of ZnO–NR being 25 and six times higher, respectively, than ZnO–OS; (ii) oxygen vacancy in ZnO–NR being 1.7 times higher than ZnO–OS; (iii) slightly lower band gap energy in ZnO–NR than ZnO–OS, adding to carrier concentration; and (iv) ZnO–NR additionally showing 12.4% chemisorbed oxygen also. Towards RIF degradation, ZnO–NR shows a much improved synergistic effect than ZnO–OS under UV light, as ZnO–NR under UV light is found to give 2.7 times higher degradation than when the catalyst and UV act independently and hence only additively. Therefore, this study is helpful in tuning the shape-dependent chemical reactivity of nanoparticles in water treatment.

Abstract Image

各向异性氧化锌纳米粒子形状对其光催化性能的协同效应,用于降解水中的药物
由于各种医药废物,环境问题日益突出。由于其持续消耗和长期存在,这些废物很难通过处理去除。我们合成了两种不同形状的氧化锌(ZnO)纳米颗粒作为催化剂--纳米棒(ZnO-NR)和椭圆形(ZnO-OS)。研究人员比较了这两种形状的催化剂在光催化降解水中利福平(RIF)(一种一线抗结核药物)方面的性能。在紫外光下,ZnO-NR 对 RIF 的归一化一阶降解速率常数比 ZnO-OS 高三倍。这是由于(i) ZnO-NR 的比表面积和比孔体积分别是 ZnO-OS 的 25 倍和 6 倍;(ii) ZnO-NR 中的氧空位是 ZnO-OS 的 1.7 倍;(iii) ZnO-NR 的带隙能略低于 ZnO-OS,从而增加了载流子浓度;以及 (iv) ZnO-NR 还显示出 12.4% 的化学吸附氧。与 ZnO-OS 相比,ZnO-NR 在紫外光下对 RIF 的降解具有更好的协同效应,因为 ZnO-NR 在紫外光下的降解效果是催化剂和紫外光独立作用时的 2.7 倍。因此,这项研究有助于在水处理中调整纳米粒子随形状变化的化学反应活性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Bulletin of Materials Science
Bulletin of Materials Science 工程技术-材料科学:综合
CiteScore
3.40
自引率
5.60%
发文量
209
审稿时长
11.5 months
期刊介绍: The Bulletin of Materials Science is a bi-monthly journal being published by the Indian Academy of Sciences in collaboration with the Materials Research Society of India and the Indian National Science Academy. The journal publishes original research articles, review articles and rapid communications in all areas of materials science. The journal also publishes from time to time important Conference Symposia/ Proceedings which are of interest to materials scientists. It has an International Advisory Editorial Board and an Editorial Committee. The Bulletin accords high importance to the quality of articles published and to keep at a minimum the processing time of papers submitted for publication.
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