Department of Chemistry, University of Agriculture, Faisalabad 38040, Pakistan E-mail:
Department of Polymer Engineering, National Textile University, Faisalabad, Pakistan.
Water Sci Technol. 2020 Jan;81(1):178-189. doi: 10.2166/wst.2020.098.
This study aims to explore the photocatalytic potential of graphene-oxide-based metal ferrites for the degradation of acetamiprid (an odorless neonicotinoid pesticide). Metal (Mn and Ni) ferrites (along with their graphene oxide composites) were prepared by the hydrothermal method while graphene oxide (GO) was synthesized using a modified Hummer's method. The composites were characterized by scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The photocatalysts were studied for their Fenton-like advanced oxidation process to degrade acetamiprid. The composites showed excellent activity against acetamiprid degradation (>90%) in 60 min under UV irradiation. The detailed optimization study was carried out to investigate the influential variables (such as pH, catalyst dose, pollutant concentration, irradiation time, oxidant dose, etc.) to achieve enhanced degradation efficiency. Moreover, the findings were endorsed by central composite design (CCD). It was concluded that degradation was enhanced in an appropriate combination of photocatalyst and hydrogen peroxide. The magnetic character of the metal ferrites and their composites played an important role in the easy separation and reusability of these materials. The present findings result in highly effective, easy to handle and stable heterogeneous photo-Fenton materials for wastewater remediation.
本研究旨在探索基于氧化石墨烯的金属铁氧体在降解乙虫腈（一种无味的新烟碱类农药）方面的光催化潜力。通过水热法制备了金属（Mn 和 Ni）铁氧体（以及它们的氧化石墨烯复合材料），而氧化石墨烯（GO）则通过改良的 Hummer 法合成。通过扫描电子显微镜、X 射线衍射、X 射线光电子能谱和傅里叶变换红外光谱对复合材料进行了表征。研究了光催化剂在类 Fenton 高级氧化过程中对乙虫腈的降解作用。在 UV 照射下，复合材料在 60 分钟内对乙虫腈的降解表现出优异的活性（>90%）。进行了详细的优化研究，以研究影响变量（如 pH 值、催化剂剂量、污染物浓度、照射时间、氧化剂剂量等），以实现增强的降解效率。此外，还通过中心复合设计（CCD）进行了验证。研究结果表明，在适当的光催化剂和过氧化氢组合下，降解效果得到了增强。金属铁氧体及其复合材料的磁性在这些材料的易于分离和可重复使用方面发挥了重要作用。本研究结果为废水修复提供了高效、易于处理和稳定的非均相光芬顿材料。
