Department of Chemistry, RMK College of Engineering and Technology, Chennai, 601206, India.
Anna University, Chennai, 600025, India.
Sci Rep. 2021 Jan 18;11(1):1734. doi: 10.1038/s41598-021-80997-z.
In order to deal with the arising environmental issues across the globe at present nano particles with unique properties laid a benchmark in the name of nano catalysis. In this work the significance of calcination temperature on the thermal, electronic, structural and surface properties of a nano catalyst produced by sol-gel method using ultrasonic radiation against the disposal of toxic textile pollutants is studied in detail. The extract of tea leaves has been used as a bio-template during the synthesis to revise the crystallite size, surface area, optical absorption potential, and rate of agglomeration of nano sized grains by regulating their physico-chemical and surface properties. The influence of calcination in the transformation of single phased anatase titania to mixed phase anatase-rutile titania and the corresponding outcome in its photocatalytic activity employed in water treatment applications have been verified. The nano catalyst obtained is characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Transition electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Thermo gravimetric analysis (TGA), Brunaueur Emmett Teller (BET) analysis, UV-Vis diffused reflectance spectroscopy (DRS-UV-Vis) etc. The mesoporosity of the particle was examined using Barrett Joyner Halenda (BJH) model. The enhanced photo catalytic efficiency (about 97.7%) of templated nano titania due to calcination is verified against Congo red, a textile dye under optimized conditions. The nano catalyst produced can be easily separated, recycled to support its economic feasibility.
为了解决目前全球出现的环境问题,具有独特性质的纳米粒子以纳米催化的名义成为了一个基准。在这项工作中,详细研究了通过溶胶-凝胶法使用超声辐射制备的纳米催化剂在热、电子、结构和表面性能方面的煅烧温度对其处理有毒纺织污染物的影响。在合成过程中,使用茶叶提取物作为生物模板,通过调节纳米颗粒的物理化学和表面性质,来修正其晶粒尺寸、比表面积、光吸收潜力和团聚率。验证了煅烧对单斜相锐钛矿向混合相锐钛矿-金红石钛的转变以及其在水处理应用中的光催化活性的影响。通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、傅里叶变换红外光谱 (FT-IR)、热重分析 (TGA)、Brunaueur Emmett Teller (BET)分析、紫外可见漫反射光谱 (DRS-UV-Vis) 等方法对纳米催化剂进行了表征。使用 Barrett Joyner Halenda (BJH) 模型检查了颗粒的中孔性。在优化条件下,通过煅烧制备的模板纳米二氧化钛对刚果红(一种纺织染料)的光催化效率(约 97.7%)得到了验证。所制备的纳米催化剂易于分离和回收,支持其经济可行性。