The present study reports in-situ green synthesis of Ag-RGO nanocomposite film using turnip leaves-extract as a reducing as well as a capping agent and its application as a highly efficient naproxen adsorbent from a contaminated aqueous solution. The nanocomposite was characterized employing XRD, Raman and FT-IR spectroscopy, FETEM and FESEM microscopy, EDS spectroscopy. The pseudo-second-order and Elovich kinetic model furnished the best correlation of the experimental data, specifying the adsorption as the rate-limiting step for naproxen (NPX) removal by Ag-RGO composite film. The Freundlich and Dubinin-Radushkevich (D-R) isotherms represented the experimental adsorption data satisfactorily, suggesting a multilayered chemical adsorption process on the heterogeneous adsorbent surfaces. The process parameters were optimized to get the maximum adsorption capacity, which was obtained as 229.25 mg g −1 (92.62%). The parametric effects of pHs and NPX concentrations were tested within a range of 2.50–8.50 and 25–100 mg dm −3 , respectively, for the contact time of 0.33–3 min at a constant temperature (298 K) and adsorbent dose (20.2 mg). The feasibility of the regeneration of the materials after adsorption is based on the experimental results. The experimentally optimized process parameters were validated using response surface methodology (RSM).

中文翻译：

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生物提取物辅助原位绿色合成 Ag-RGO 纳米复合膜以增强萘普生去除

本研究报告了使用萝卜叶提取物作为还原剂和封端剂原位绿色合成 Ag-RGO 纳米复合膜及其作为高效萘普生吸附剂的应用。采用XRD、拉曼和FT-IR光谱、FETEM和FESEM显微镜、EDS光谱对纳米复合材料进行表征。伪二级和 Elovich 动力学模型提供了实验数据的最佳相关性，将吸附指定为 Ag-RGO 复合膜去除萘普生 (NPX) 的限速步骤。Freundlich 和 Dubinin-Radushkevich (DR) 等温线令人满意地代表了实验吸附数据，表明在异质吸附剂表面上存在多层化学吸附过程。优化工艺参数以获得最大吸附容量，获得为229.25 mg g -1 (92.62%)。分别在 2.50–8.50 和 25–100 mg dm -3 范围内测试 pH 值和 NPX 浓度的参数效应，接触时间为 0.33–3 分钟，恒温 (298 K) 和吸附剂剂量 (20.2毫克）。吸附后材料再生的可行性是基于实验结果。使用响应面方法 (RSM) 验证实验优化的工艺参数。吸附后材料再生的可行性是基于实验结果。使用响应面方法 (RSM) 验证实验优化的工艺参数。吸附后材料再生的可行性是基于实验结果。使用响应面方法 (RSM) 验证实验优化的工艺参数。