Department of Pesticide Chemistry & Technology, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.
Department of Soil & Water Science, Faculty of Agriculture, Alexandria University, Alexandria, Egypt.
Environ Monit Assess. 2024 Nov 12;196(12):1191. doi: 10.1007/s10661-024-13349-9.
In an attempt to create economically feasible and sustainable wastewater treatment "green" techniques, Malva parviflora leaf water extract was used for biosynthesizing silver nanoparticles (Malva-AgNPs). Fourier transform infrared, ultraviolet-visible (UV-Vis), scanning electron microscopy, and dynamic light scattering (DLS) were used for the characterization of Malva-AgNPs. UV-Vis and DLS analysis revealed the stability of the Malva-AgNPs at a wavelength of 420 nm and an average size of 100 nm ± 1 nm. A zeta potential of - 26.4 mV provides additional support for the stability of the material. The removal studies were conducted using atrazine and methylene blue (MB) in a single or mixed liquid state. The adsorbent dose, pH, incubation time, and pollutant concentration in the adsorption process were investigated. The optimal removal for 500 mg L of atrazine and MB at the adsorbent dosage of 450 mg, when incubated for 5 min, was found to be 99.5% and 82.03% for atrazine and MB, respectively. Also, Malva-AgNPs eliminated more than 95% and 50% of the atrazine and MB mixture, respectively, in 5 min. The kinetics study showed that the pseudo-second-order kinetics model was a better fit for explaining the experimental adsorption experiments for atrazine and MB. The obtained equilibrium adsorption data were examined using the Langmuir and Freundlich isotherm models, which indicate that atrazine and MB have maximum adsorption capacities of 434.78 mg g and 400 mg g, respectively.
为了创造经济可行且可持续的废水处理“绿色”技术，我们使用 Malva parviflora 叶水提取物来生物合成银纳米粒子（Malva-AgNPs）。傅里叶变换红外、紫外-可见（UV-Vis）、扫描电子显微镜和动态光散射（DLS）用于表征 Malva-AgNPs。UV-Vis 和 DLS 分析表明，Malva-AgNPs 在 420nm 波长和 100nm±1nm 的平均粒径下具有稳定性。-26.4mV 的zeta 电位为材料的稳定性提供了额外的支持。采用单一组分或混合液状态的莠去津和亚甲基蓝（MB）进行去除研究。研究了吸附过程中的吸附剂用量、pH、孵育时间和污染物浓度。在吸附剂用量为 450mg 时，对 500mg L 的莠去津和 MB 的最佳去除率分别为 99.5%和 82.03%。此外，Malva-AgNPs 在 5min 内分别消除了超过 95%和 50%的莠去津和 MB 混合物。动力学研究表明，准二级动力学模型更适合解释莠去津和 MB 的实验吸附实验。用 Langmuir 和 Freundlich 等温模型检验获得的平衡吸附数据，表明莠去津和 MB 的最大吸附容量分别为 434.78mg g 和 400mg g。
