Kumar Sumit, Pandey Jyoti, Tripathi Ritika, Chauhan Suchitra Rajput
Centre for Advanced Materials and Devices (CAMD), School of Engineering and Technology, BML Munjal University, Sidhrawali, Gurgaon 122413, Haryana, India.
ACS Omega. 2023 Jul 21;8(30):27732-27742. doi: 10.1021/acsomega.3c03860. eCollection 2023 Aug 1.
The inadvertent discharge of industrial effluents, mainly textile, contributes to the complex contamination load in water bodies. Textile dyes are the critical effluents and recalcitrant to traditional remediation procedures. Therefore, energy viable and environment friendly solutions are needed. In this study, we have synthesized zinc oxide nanorods (NRs) at various temperatures using modified thermal decomposition and evaluated its photocatalytic activities. Field effect scanning electron microscopy has confirmed rod-like morphology till = 500 °C and spherical morphology from = 600 °C onward. Photoluminescence spectra have shown a prominent defect peak in the synthesized ZnO, except for the NRs synthesized at 300 °C. Synthesized ZnO NRs and NPs have been employed to degrade crystal violet (CV) and congo red (CR) dyes. ZnO NRs have shown impressive photocatalytic performance with faster treatment time as compared to the earlier reports. Synthesis parameters are well correlated with the observed high efficiency and the band gap tailoring. Based on our findings, for the first time, we have proposed (i) defect model correlating synthesis parameters with defect states, (ii) systematic correlation of defect states with photocatalytic efficiency, and (iii) ZnO nanorods synthesized at 300 °C via an improved synthesis method as a promising photocatalytic solution to degrade the CV and CR dyes in contaminated water.
工业废水（主要是纺织废水）的意外排放导致水体中污染物负荷复杂。纺织染料是关键的废水成分，且对传统修复程序具有抗性。因此，需要可行且环保的解决方案。在本研究中，我们采用改进的热分解法在不同温度下合成了氧化锌纳米棒（NRs），并评估了其光催化活性。场效应扫描电子显微镜证实，在500°C之前为棒状形态，从600°C起为球形形态。光致发光光谱表明，除了在300°C合成的NRs外，合成的ZnO中存在一个明显的缺陷峰。合成的ZnO NRs和NPs已被用于降解结晶紫（CV）和刚果红（CR）染料。与早期报道相比，ZnO NRs表现出令人印象深刻的光催化性能，处理时间更短。合成参数与观察到的高效率和带隙调整密切相关。基于我们的研究结果，我们首次提出：（i）将合成参数与缺陷态相关联的缺陷模型；（ii）缺陷态与光催化效率的系统关联；（iii）通过改进的合成方法在300°C合成的ZnO纳米棒作为一种有前途的光催化解决方案，用于降解受污染水中的CV和CR染料。
