Department of Mining Engineering, Indian Institute of Engineering Science and Technology, Howrah, Shibpur, 711 103, India.
School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata, Jadavpur, 700 032, India.
Environ Sci Pollut Res Int. 2022 Jan;29(5):6698-6709. doi: 10.1007/s11356-021-15972-2. Epub 2021 Aug 30.
Magnetite (FeO) nanoparticles coated with dextrose and gluconic acid possessing both super-paramagnetism and excellent optical properties have been productively synthesized through a straightforward, efficient and cost-efficient hydrothermal reduction route using Fe as sole metal precursor acquired from accumulated iron ore tailings-a mining waste that usually represents a major environmental threat. FeO/C nanocomposites were fully elucidated by FEGSEM and TEM, revealing a combination of platelets (<1 μm) capped by particles (<10 nm) and magnetite which was verified by XPS, which demonstrated also oxygen deficiency. A dextrose/gluconic acid coating was elucidated by Fourier transform-infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA). The FeO/C nanocomposites were found to be superparamagnetic at room temperature. Meanwhile, their optical properties were investigated by UV-visible diffuse reflectance spectroscopy (UV-vis DRS) and photoluminescence (PL) spectroscopy; an E of 1.86 eV was determined, and emissions at 612 and 650 nm (ex. 250 nm) were consistent with the XPS identification of oxygen vacancies. The efficacy of the as-synthesized magnetically recoverable magnetite/carbon (FeO/C) nanocomposites has been exhibited in the photocatalytic degradation of the toxic textile (industrial) dye bodactive red BNC-BS.
通过使用从积累的铁矿石尾矿（通常是主要的环境威胁）中获得的唯一金属前体铁，通过简单、高效且具有成本效益的水热还原途径，成功合成了具有超顺磁性和优异光学性能的葡萄糖和葡萄糖酸包覆的磁铁矿（FeO）纳米粒子。FEGSEM 和 TEM 充分阐明了 FeO/C 纳米复合材料，揭示了由颗粒（<10nm）和磁铁矿覆盖的薄片（<1μm）的组合，XPS 验证了这一点，XPS 还表明存在氧缺陷。傅里叶变换红外（FT-IR）光谱和热重分析（TGA）阐明了葡萄糖/葡萄糖酸涂层。在室温下，FeO/C 纳米复合材料被发现具有超顺磁性。同时，通过紫外可见漫反射光谱（UV-vis DRS）和光致发光（PL）光谱研究了它们的光学性质；确定了 1.86eV 的 E 值，并且在 612nm 和 650nm（激发 250nm）处的发射与 XPS 对氧空位的识别一致。所合成的磁性可回收磁铁矿/碳（FeO/C）纳米复合材料在有毒纺织（工业）染料 bodactive red BNC-BS 的光催化降解中表现出了功效。
