Abstract

In this research, a simple and rapid method for the separation and preconcentration of trace amounts of crystal violet (CV) from aqueous sample solutions by modified magnetic nano-particles (MNPs) has been developed. The modification of magnetite nanoparticles was conducted by tetra ethoxysilane (TEOS) followed by micelles of anionic surfactant (SDS) to enhance the preconcentration of CV. To characterize the shape and structure of the nanoadsorbent, FT-IR and XRD procedures were used. Also, the average size of the synthesized nanoparticles was achieved between 30 and 40 nm by TEM technique. The effects of some important parameters such as: aqueous solution pH, adsorbent dosage, contact time, temperature and desorption conditions on the separation and concentration of CV were investigated. So, under optimal experimental conditions: aqueous solution pH 6, solution temperature = 20 °C, 7 mg of adsorbent, 1 mL of eluent (0.8 mL of acetonitrile + 0.2 mL of acetic acid), the recovery of CV from river water samples was achieved 98.32 ± 0.056% (n = 5) in two short periods of time for extraction (5 min) and elution (2 min). The maximum sorption capacity of the nano-composite was determined to be 16.37 mg/g. Also linear dynamic range and limit of detection were calculated to be 10–2500 ppb and 1.82 ppb, respectively. Finally, the proposed method was successfully applied for the separation and concentration of CV from the real water samples and the results were satisfied.

Graphical abstract

Under optimal conditions, a significant amount of nanocomposite was added to the dye solution. After dye removal in a short time, the nanoadsorbent-containing dye was magnetically separated from the solution and then the adsorbed dye was eluted into low volume of a suitable eluting solution.

中文翻译：

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SDS胶束包覆的Fe 3 O 4 / SiO 2磁性纳米粒子的合成，作为从天然水样品中轻松去除和浓缩结晶紫的极好吸附剂

摘要

在这项研究中，已经开发了一种简单而快速的方法，即通过修饰的磁性纳米粒子（MNP）从水溶液中分离和预富集痕量的结晶紫（CV）。磁铁矿纳米颗粒的改性是通过四乙氧基硅烷（TEOS）进行，然后是阴离子表面活性剂（SDS）的胶束，以提高CV的预浓缩。为了表征纳米吸附剂的形状和结构，使用了FT-IR和XRD方法。另外，通过TEM技术，合成的纳米颗粒的平均尺寸在30至40nm之间。研究了水溶液pH值，吸附剂用量，接触时间，温度和解吸条件等重要参数对CV分离和浓度的影响。因此，在最佳实验条件下：n  = 5）在两个短时间内进行提取（5分钟）和洗脱（2分钟）。纳米复合材料的最大吸附能力确定为16.37 mg / g。线性动态范围和检出限分别计算为10–2500 ppb和1.82 ppb。最后，该方法成功应用于实际水样中CV的分离和浓缩，结果令人满意。

图形概要

在最佳条件下，将大量的纳米复合材料添加到染料溶液中。在短时间内去除染料后，将含纳米吸附剂的染料从溶液中磁分离，然后将吸附的染料洗脱到小体积的合适洗脱溶液中。