Green Technology Group, Environmental Sciences Department, Faculty of Science, Alexandria University, 21511, Alexandria, Egypt.
Green Technology Group, Environmental Sciences Department, Faculty of Science, Alexandria University, 21511, Alexandria, Egypt; National Egyptian Biotechnology Experts Network, National Egyptian Academy for Scientific Research and Technology, Egypt.
J Environ Manage. 2022 Aug 15;316:115238. doi: 10.1016/j.jenvman.2022.115238. Epub 2022 May 13.
In the current study, a novel, green, low-cost, and sustainable path for the phyto-fabrication of Ag-Cu biochar nanocomposite (Ag-Cu/biochar) by Atriplex halimus biomass and aqueous extract is described. Surface plasmon resonance peaks were detected at 450 nm and 580 nm signifying the formation of both silver and copper nanoparticles, respectively on the biochar surface. XRD analysis confirmed the crystal structure of the phytosynthesized Ag-Cu/biochar whereas FT-IR, SEM, EDX, and XPS analyses confirmed the successful phytofabrication of the composite. Ag and Cu nanoparticles loaded on the biochar surface were almost spherically-shaped with a particle size ranging from 25 nm to 45 nm. Zeta potential of -25.5 mV showed the stability of Ag-Cu/biochar. The potential of this novel nanocomposite in the removal of doxycycline (DOX) was evident under different conditions as it reached nearly 100% under the optimum reaction conditions (DOX concentration; 50 ppm, pH; 9, a dose of Ag-Cu/biochar; 0.01 g, temperature; 25 °C, and HO concentration; 100 mM). The promising regeneration of Ag-Cu/biochar was evident as the removal efficiency was 81% after 6 consecutive cycles. Ag-Cu/biochar was also shown an excellent antimicrobial activity against gram-negative bacteria as well a promising antioxidant activity.
在当前的研究中，描述了一种新颖、绿色、低成本和可持续的方法，通过盐角草生物质和水提物来植物合成 Ag-Cu 生物炭纳米复合材料（Ag-Cu/生物炭）。在生物炭表面检测到表面等离子体共振峰，分别在 450nm 和 580nm 处，分别表示银和铜纳米粒子的形成。XRD 分析证实了植物合成的 Ag-Cu/生物炭的晶体结构，而 FT-IR、SEM、EDX 和 XPS 分析证实了复合材料的成功植物合成。负载在生物炭表面的 Ag 和 Cu 纳米粒子几乎呈球形，粒径范围为 25nm 至 45nm。-25.5mV 的 ζ 电位表明 Ag-Cu/生物炭的稳定性。在不同条件下，这种新型纳米复合材料在去除强力霉素（DOX）方面的潜力显而易见，因为在最佳反应条件下（DOX 浓度为 50ppm、pH 值为 9、Ag-Cu/生物炭剂量为 0.01g、温度为 25°C 和 HO 浓度为 100mM），它几乎达到了 100%的去除率。Ag-Cu/生物炭的良好再生性能也显而易见，在 6 次连续循环后，去除效率为 81%。Ag-Cu/生物炭还表现出对革兰氏阴性菌的优异抗菌活性和有前景的抗氧化活性。
