School of Biosciences and Technology, VIT, Vellore, India; Centre for Nano Science and Technology, Anna University, Chennai, India.
Centre for Nano Science and Technology, Anna University, Chennai, India.
J Environ Manage. 2022 Feb 1;303:114128. doi: 10.1016/j.jenvman.2021.114128. Epub 2021 Nov 23.
In the present study, ZnO-FeO nanoparticles were synthesized using the leaves of Camellia sinensis and immobilized in crosslinked alginate-chitosan polymer beads and tested for their photocatalytic applications. The prepared nanocomposite was used for the simultaneous adsorption and photocatalytic degradation of acid violet 7 (AV7) dye. The optimization of reaction conditions ensured higher dye removal efficacy up to 94.21 ± 1.02% using the nanocomposite under UV-C irradiation of 365 nm. The kinetics of the adsorption study fitted well with the pseudo-first-order reaction. The Langmuir model fitted better to the adsorption isotherms compared to the Freundlich and Temkin models. The mechanism of degradation was studied by analyzing the treated AV7 solution. The removal efficiency in tap water, groundwater, and lake water was 83.23 ± 0.4%, 69.13 ± 1.6%, and 67.89 ± 0.3%, respectively. The residual toxicity of the degraded AV7 solution was tested on model organisms like freshwater algae, Scenedesmus sp., and plant model, Allium cepa, demonstrating the lower toxicity of the degraded AV7 product. Finally, a cost-benefit analysis of the experiments was also carried out.
在本研究中，使用茶树的叶子合成了 ZnO-FeO 纳米粒子，并将其固定在交联的海藻酸钠-壳聚糖聚合物珠中，用于光催化应用。所制备的纳米复合材料用于同时吸附和光催化降解酸性紫 7（AV7）染料。通过优化反应条件，在 365nm 的 UV-C 照射下，使用纳米复合材料可达到高达 94.21±1.02%的更高染料去除效率。吸附研究的动力学很好地符合准一级反应。与 Freundlich 和 Temkin 模型相比，Langmuir 模型更适合吸附等温线。通过分析处理后的 AV7 溶液研究了降解机制。在自来水、地下水和湖水的去除效率分别为 83.23±0.4%、69.13±1.6%和 67.89±0.3%。降解的 AV7 溶液的残留毒性通过淡水藻类 Scenedesmus sp. 和植物模型 Allium cepa 等模型生物进行了测试，证明降解的 AV7 产物毒性较低。最后，还对实验进行了成本效益分析。
