Akl Magda A, Elawady Doha M M, Mostafa Aya G, El-Gharkawy Elsayed R H
Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, 31556, Egypt.
Sci Rep. 2025 May 19;15(1):17324. doi: 10.1038/s41598-025-01318-2.
In the present study a novel biogenic nano-silver doped grapefruit peels biocomposite (GFP@Ag) has been synthesized in a single-step procedure. The GFP@Ag nano-biocomposite was characterized using UV Visible spectrophotometer, Fourier Transform infrared (FTIR), scanning electron microscopy (SEM), (EDS), Thermogravimetric analysis (TGA), Proton nuclear resonance (HNMR), and N adsorption desorption isotherm (BET). A combined approach of photocatalysis and biosorption is involved for the Toluidine blue O (TO), Crystal violet (CV), and brilliant green (BG) cationic dyes utilizing GFP@Ag biocomposite at pH (4-8). The investigated dye concentration was (100-200 ppm) with contact time (20-120 min) and 0.005 g of GFP@Ag at 25 °C under visible sunlight. The maximum degradation-biosorption capacities were 194.8 mg/g, 390.6 mg/g, and 306 mg/g for TO, CV, and BG, respectively. It was concluded that the TO, CV, and BG experimental data matched the pseudo-2nd -order (PSO) and Langmuir models from the kinetic and isotherm studies, respectively. The GFP@Ag was successfully applied to remove TO, CV, and BG multi systems (binary & tertiary). It was concluded that from the thermodynamics investigation, the current photocatalytic-biosorption processes are spontaneous and endothermic. The investigation was extended to estimate a straightforward and environmentally friendly method of producing silver nanoparticles that was able to overcome the drawbacks of alternative methods. Moreover, the evaluation of the applicability of GFP@Ag for the TO, CV, and BG removal in water samples was obtained. The GFP@Ag can be regenerated after the TO removal. The mechanism of the degradation-biosorption of the pollutants under study is elucidated.
在本研究中，通过一步法合成了一种新型的生物源纳米银掺杂葡萄柚皮生物复合材料（GFP@Ag）。使用紫外可见分光光度计、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、能谱仪（EDS）、热重分析（TGA）、质子核磁共振（HNMR）和氮吸附-脱附等温线（BET）对GFP@Ag纳米生物复合材料进行了表征。在pH值为4 - 8的条件下，利用GFP@Ag生物复合材料对甲苯胺蓝O（TO）、结晶紫（CV）和亮绿（BG）阳离子染料采用光催化和生物吸附相结合的方法。在25℃可见光照射下，研究的染料浓度为100 - 200 ppm，接触时间为20 - 120分钟，GFP@Ag用量为0.005 g。TO、CV和BG的最大降解-生物吸附容量分别为194.8 mg/g、390.6 mg/g和306 mg/g。动力学和等温线研究得出，TO、CV和BG的实验数据分别符合准二级（PSO）模型和朗缪尔模型。GFP@Ag成功应用于去除TO、CV和BG多体系（二元和三元）。热力学研究得出，当前的光催化-生物吸附过程是自发的且吸热的。该研究进一步扩展，以评估一种简单且环保的制备银纳米颗粒的方法，该方法能够克服其他方法的缺点。此外，还评估了GFP@Ag在水样中去除TO、CV和BG的适用性。去除TO后，GFP@Ag可以再生。阐明了所研究污染物的降解-生物吸附机制。
