Dhanshri V. Patil, Vishal S. Patil, Suraj R. Attar, Varsha L. Kamble, Asmita S. Tapase, Girish R. Pathade, Sushilkumar A. Jadhav
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引用次数: 0
Abstract
Graphene oxide (GO)-based photocatalysts integrated with metal oxide nanoparticles have emerged as a promising class of advanced materials for sustainable wastewater treatment, owing to their exceptional photocatalytic efficiency in dye degradation under solar irradiation. In this study, a gel-entrapped graphene oxide–zinc oxide (GEL-GO-ZnO@blocks) hybrid material was engineered as an eco-friendly, sunlight-responsive, efficient, and recyclable photocatalyst for the degradation of cationic dyes. The GO was prepared utilizing rice husk to make it a sustainable and cost-effective approach. The synthesized materials were characterized by Scanning Electron Microscopy coupled with Energy-Dispersive X-ray Spectroscopy (SEM–EDX), Transmission Electron Microscopy (TEM), X-ray Diffraction (XRD), Fourier Transform Infrared (FTIR) spectroscopy, and Raman spectroscopies. The characterization confirmed the successful formation of ZnO nanoparticles uniformly anchored on GO and effectively immobilized within the agar gel matrix. Photocatalytic degradation of hazardous dyes, namely, Methylene Blue (MB), Crystal Violet (CV), Basic Fuchsin (BF), and Safranin-O (SF-O) was carried out under sunlight. Degradation efficiencies ranged from 78 to 98% upon sunlight exposure. The synergistic effect between GO and ZnO, along with gel entrapment, played a key role in enhancing degradation performance, making the photocatalyst efficient, sustainable, cost-effective, and environmentally benign. The kinetic studies revealed that all dyes followed pseudo-first-order reaction kinetics with high correlation coefficients (R2 > 0.96), confirming the reliability of the photocatalytic process. MB showed the highest degradation rate, highlighting the superior efficiency of the GEL-GO-ZnO@blocks. The photocatalyst was reusable through simple filtration and ethanol washing, maintaining performance over several cycles.
基于氧化石墨烯（GO）的光催化剂与金属氧化物纳米颗粒集成，由于其在太阳照射下对染料降解具有优异的光催化效率，已成为一类有前途的可持续废水处理先进材料。在这项研究中，一种凝胶包埋的氧化石墨烯-氧化锌（GEL-GO-ZnO@blocks）杂化材料被设计成一种环保的、对阳光敏感的、高效的、可回收的光催化剂，用于降解阳离子染料。利用稻壳制备氧化石墨烯，使其成为一种可持续且具有成本效益的方法。通过扫描电子显微镜、能量色散x射线能谱（SEM-EDX）、透射电子显微镜（TEM）、x射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和拉曼光谱对合成材料进行表征。表征证实了ZnO纳米颗粒的成功形成，这些纳米颗粒均匀地锚定在氧化石墨烯上，并有效地固定在琼脂凝胶基质内。对亚甲基蓝（MB）、结晶紫（CV）、碱性品红（BF）、红花素- o （SF-O）等有害染料进行了光催化降解。在阳光照射下，降解效率从78%到98%不等。氧化石墨烯和氧化锌之间的协同作用以及凝胶包裹在提高降解性能方面发挥了关键作用，使光催化剂高效、可持续、经济、环保。动力学研究表明，所有染料均符合准一级反应动力学，相关系数高（R2 > 0.96），证实了光催化过程的可靠性。MB的降解率最高，说明GEL-GO-ZnO@blocks的降解效率较高。通过简单的过滤和乙醇洗涤，光催化剂可重复使用，在几个循环中保持性能。图形抽象
期刊介绍：
Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry.
The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.
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