In this study, the silver nanoparticles (AgNPs) as an eco-friendly, efficient and low-cost adsorbent was synthesized from Chenopodium botrys extract. Characteristics of the prepared adsorbent were investigated using scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDAX). According to the particle size distribution, the average size of AgNPs was obtained 11.9 nm. AgNPs were used for methyl blue (MB) and methyl orange (MO) removal from aqueous solution. Maximum removal percentages of 97.50 and 95.00 was obtained under optimum conditions, including contact time of 25 min, pH = 10, adsorbent dosage of 0.9 g, and dye concentration of 30 mg/L for MB and MO, respectively. Langmuir isotherm indicated the best results of adsorption related to the MB and MO with the maximum adsorption capacity of (q_max) 90.09 and 80 mg g⁻¹ for MB and MO, respectively. The kinetics study showed that the results were fitted to the pseudo-second-order model with the coefficient of determination (R²) of 0.9984 and 0.9919 for MB and MO, respectively. The process of removal can be also by adsorption of dye molecule on the surface of Ag-NPs and also may be due to the removal of dye molecules by hydroxyl radicals generated by the NPs effect on water molecules in the presence of light. The proposed adsorbent with its great properties can be used to remove contaminants from industrial wastewater before discharge to the environment.

Graphic abstract

中文翻译：

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使用藜麦芽孢属水提取物轻松绿色制备纳米级银颗粒，用于从水溶液中去除染料

在这项研究中，银纳米颗粒（AgNPs）作为一种环保，高效且低成本的吸附剂，是由藜属植物中合成的提取。使用扫描电子显微镜（SEM），透射电子显微镜（TEM），傅立叶变换红外光谱（FTIR），X射线衍射（XRD）和能量色散X射线光谱（EDAX）研究了制备的吸附剂的特性。根据粒径分布，获得AgNP的平均尺寸为11.9nm。AgNP用于从水溶液中去除甲基蓝（MB）和甲基橙（MO）。在最佳条件下，包括MB和MO的接触时间分别为25分钟，pH = 10，吸附剂剂量为0.9 g和染料浓度为30 mg / L时，最大去除率分别为97.50和95.00。Langmuir等温线表明，与MB和MO有关的最佳吸附结果具有最大吸附容量（q _max）MB和MO分别为90.09和80 mg g ^-1。动力学研究表明，结果拟合到伪二级模型，MB和MO的测定系数（R ²）分别为0.9984和0.9919。去除过程也可以通过染料分子在Ag-NPs表面的吸附来实现，也可能是由于NPs在有光的情况下对水分子的影响所产生的羟基自由基所导致的染料分子的去除。所提出的具有良好性能的吸附剂可用于在排放到环境中之前从工业废水中去除污染物。

图形摘要