School of Chemistry, University of Hyderabad, Prof. C.R. Rao Road, Central University PO, Hyderabad, 500046, India; Department of Botany, St. Thomas College, Pala, 686574, India.
School of Chemistry, University of Hyderabad, Prof. C.R. Rao Road, Central University PO, Hyderabad, 500046, India.
J Hazard Mater. 2019 Jun 5;371:261-272. doi: 10.1016/j.jhazmat.2019.03.021. Epub 2019 Mar 6.
Magnetite nanoparticles use for the remediation of toxic metal ions. Therefore, the scope of green synthesis of magnetite nanoparticles from Hevea bark extract, and application of these particles for the environmental remediation of Cd and Na tested. Mixing of 10.0 mL each bark extract (1.0 g in 25.0 mL HO) and iron solution (10.0 mM FeCl and 5.0 mM FeCl) resulted formation of semicrystalline magnetite nanoparticles having magnetic saturation at 10 G. The particles characterized with the help of scanning electron microscopy, energy dispersive spectroscopy, Uv-vis spectroscopy, vibrating sample magnetometry, powder X-Ray diffraction, Fourier-transform infrared spectroscopy, and differential thermal analysis coupled with thermogravimetry. The phytochemicals responsible for priming and coating of nanoparticle were phenolics, especially benzoic acid derivatives. Adsorption of metal ions to nanoparticles followed pseudo-second-order model. Maximum Cd and Na adsorption capacity were 37.03 and 3.95 mg g respectively. The difference in Cd and Na adsorption capacity was the result of multilayer and monolayer adsorption processes respectively. Highest metal ion adsorption occurred at temperature 10.0-20.0 °C and pH 6.0. Metal adsorption property of the nanoparticles decreased the accumulation of Cd and Na in rice plants. The plant growth promotion effects of nanoparticles explained regarding biomass, osmolyte content, and oxidative stress tolerance. Therefore, the nanoparticles produced in the study can use as a magnetically separable nano sorbent of metal ions as well as ameliorant of metal stress in rice.
磁性纳米颗粒用于修复有毒金属离子。因此，从橡胶树皮提取物中绿色合成磁性纳米颗粒的范围，并测试这些颗粒对 Cd 和 Na 的环境修复应用。将 10.0 mL 每份树皮提取物（1.0 g 在 25.0 mL HO 中）和铁溶液（10.0 mM FeCl 和 5.0 mM FeCl）混合，形成半晶态磁性纳米颗粒，其在 10 G 时具有饱和磁化强度。利用扫描电子显微镜、能量色散光谱、紫外-可见光谱、振动样品磁强计、粉末 X 射线衍射、傅里叶变换红外光谱和差示热分析与热重分析对颗粒进行了表征。引发和包覆纳米颗粒的植物化学物质是酚类物质，特别是苯甲酸衍生物。金属离子吸附到纳米颗粒上遵循伪二级模型。最大 Cd 和 Na 吸附容量分别为 37.03 和 3.95 mg/g。Cd 和 Na 吸附容量的差异是多层和单层吸附过程的结果。最高的金属离子吸附发生在 10.0-20.0°C 和 pH 6.0 的温度下。纳米颗粒的金属吸附性能降低了 Cd 和 Na 在水稻植株中的积累。纳米颗粒的植物生长促进作用可以用生物量、渗透调节剂含量和氧化应激耐受性来解释。因此，研究中制备的纳米颗粒可以用作金属离子的磁性可分离纳米吸附剂，以及改善水稻中的金属胁迫。
