Ravi Guguloth, Sarasija Madderla, Ayodhya Dasari, Kumari Lunavath Shanthi, Ashok Dongamanti
Department of Chemistry, Osmania University, Hyderabad, TS, 500007, India.
Department of Chemistry, Satavahana University, Karimnagar, TS, 505002, India.
Nano Converg. 2019 Apr 10;6(1):12. doi: 10.1186/s40580-019-0181-6.
This work focuses on the synthesis of undoped and doped lanthanum oxide nanoparticles (LaO NPs) by a simple co-precipitation method for the catalytic reduction of 4-nitrophenol (4-NP) using NaBH as a reducing agent. Their optical properties, morphologies, structure, chemical compositions and electronic properties were carefully characterized by XRD, FTIR, SEM, TEM, PL and UV-visible absorption spectroscopy. The SEM and TEM images showed various shape morphologies and sizes of the particles. The XRD pattern revealed a polycrystalline nature with the hexagonal structure of the LaO NPs. The synthesized undoped and doped LaO NPs were also employed as catalysts for the reduction of 4-nitrophenol, it shows that the doped (Sm, Gd and Hf) LaO NPs provided better catalytic activity than the undoped LaO NPs. Moreover, Hf doped LaO NPs exhibited an enhanced catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol in 90 min. The catalytic conversion was studied by UV-vis spectroscopy with high reduction rate (k = 2.048 min). The applications of the present study may utilize in the removal of toxic pollutants in a cleaning of environmental pollution as well as in industrial applications.
本工作聚焦于通过简单的共沉淀法合成未掺杂和掺杂的氧化镧纳米颗粒（LaO NPs），以硼氢化钠（NaBH）作为还原剂催化还原4-硝基苯酚（4-NP）。通过X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、光致发光（PL）和紫外可见吸收光谱对其光学性质、形态、结构、化学成分和电子性质进行了仔细表征。SEM和TEM图像显示了颗粒的各种形状形态和尺寸。XRD图谱揭示了LaO NPs具有六方结构的多晶性质。合成的未掺杂和掺杂的LaO NPs也被用作催化还原4-硝基苯酚的催化剂，结果表明，掺杂（钐、钆和铪）的LaO NPs比未掺杂的LaO NPs具有更好的催化活性。此外，铪掺杂的LaO NPs在90分钟内对将4-硝基苯酚还原为4-氨基苯酚表现出增强的催化活性。通过紫外可见光谱研究了催化转化率，还原速率较高（k = 2.048 min⁻¹）。本研究的应用可用于环境污染治理中有毒污染物的去除以及工业应用。
