Division of Crop Protection, ICAR-National Rice Research Institute, Cuttack, Odisha, 753006, India.
Indira Gandhi Krishi Vishwavidyalaya, Krishak Nagar, Raipur, Chhattisgarh, 492012, India.
Environ Sci Pollut Res Int. 2023 Sep;30(45):101467-101482. doi: 10.1007/s11356-023-29562-x. Epub 2023 Aug 31.
The quantum of pesticides in surface as well as drinking water has become a serious health hazard. In this experiment, magnesium oxide nanoparticles (MgO NPs) were synthesized using leaves of purple-colored rice variety (Crossa) and utilized for simultaneous removal of three pesticides, namely, thiamethoxam, chlorpyriphos, and fenpropathrin from water. The biogenic MgO NPs were characterized using SEM-EDX, FTIR, XRD, DLS, etc. The optimum synthesis parameters (1 M NaOH, 80 °C, and 2 h) resulted in maximum yield of MgO NPs (87.7 mg), minimum hydrodynamic diameter (35.12 nm), poly dispersity index (0.14) and mean zeta potential (-11 mV). Sorption data of the three pesticides fitted well with non-linear Langmuir and Freundlich isotherm models and non-linear pseudo-second-order kinetic model. The maximum adsorption capacity of MgO NPs for the three pesticides was 87.66 µg/mg, as obtained from the Langmuir isotherm model. Under optimum conditions (initial concentration, 40 mg/L; dose, 30 mg/30 mL; and pH, 9), 60.13, 80.53, and 92.49% removal of thiamethoxam, chlorpyriphos, and fenpropathrin was achieved with a 100% desirability, respectively. Thus, the biogenic MgO NPs could be an efficient adsorbent of pesticides and could be recommended for pesticide decontamination in water treatment plants and domestic water purifier systems.
表面和饮用水中的农药含量已成为严重的健康危害。在这项实验中，使用紫稻品种（Crossa）的叶子合成了氧化镁纳米粒子（MgO NPs），并将其用于同时去除水中的三种农药，即噻虫嗪、毒死蜱和氯菊酯。使用 SEM-EDX、FTIR、XRD、DLS 等方法对生物合成的 MgO NPs 进行了表征。最佳合成参数（1 M NaOH、80°C 和 2 h）得到了最大产率的 MgO NPs（87.7 mg）、最小水动力直径（35.12 nm）、多分散指数（0.14）和平均 Zeta 电位（-11 mV）。三种农药的吸附数据均符合非线性 Langmuir 和 Freundlich 等温线模型以及非线性伪二阶动力学模型。从 Langmuir 等温线模型得出，MgO NPs 对三种农药的最大吸附容量为 87.66 µg/mg。在最佳条件下（初始浓度为 40 mg/L；剂量为 30 mg/30 mL；pH 值为 9），噻虫嗪、毒死蜱和氯菊酯的去除率分别达到了 60.13%、80.53%和 92.49%，理想性达到了 100%。因此，生物合成的 MgO NPs 可以作为一种有效的农药吸附剂，可推荐用于水处理厂和家用净水器系统中的农药脱除。
