Maqbool Sobia, Ahmed Adeel, Mukhtar Arif, Jamshaid Muhammad, Rehman Aziz Ur, Anjum Saima
Department of Chemistry, The Government Sadiq College Women University Bahawalpur, Punjab, 63100, Pakistan.
College of Materials Science and Engineering, College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, 266071, China.
Environ Sci Pollut Res Int. 2023 Jan;30(3):7121-7137. doi: 10.1007/s11356-022-22701-w. Epub 2022 Aug 27.
This work aims to develop a highly efficient solar light-induced photocatalyst based on La-Mn co-doped FeO nanoparticles. Pure FeO and La-Mn co-doped FeO nanoparticles were fabricated by a simple co-precipitation method. The photocatalysts were analyzed for their morphological, structural, and magnetic characteristics. Scanning electron microscopy analysis demonstrated the formation of semi-spherical nanoparticles along with small aggregations. The size of nanoparticles was measured using a transmission electron microscope and found in the range of 42-49 nm. The crystalline nature and geometry of synthesized nanoparticles were investigated using X-ray diffraction analysis. Due to the incorporation of La-Mn, the saturation magnetization and remanent magnetization of the nanoparticles decreased from 6.17 to 2.89 emu/g and 1.15 to 0.52 emu/g, respectively, while the coercivity was reduced from 756.72 to 756.67 Oe. The surface area of nanoparticles was increased from 77.93 to 87.45 m/g as a result of La-Mn co-doping. The photocatalytic performance of the FeO, LaMnFeO, and LaMnFeO catalysts was assessed by their capability to degrade Rhodamine B (RhB) under solar light illumination. LaMnFeO displayed exceptional degradation performance, degrading RhB to 91.78% in 240 min, in comparison to LaMnFeO (71.09%) and pristine FeO (58.21%) under specified reaction conditions ((RhB) = 50 ppm; (catalyst) = 40 mg/L; pH = 7; T = 25 °C)). RhB degradation was affected by changing pH, catalytic dosage, dye concentration, and temperature. The degradation of RhB was found to be pseudo-1st order kinetics. The exceptional photocatalytic performance of LaMnFeO catalysts showed that the synthesized nanoparticles could be effectively utilized to remove organic pollutants from industrial wastewater.
这项工作旨在开发一种基于镧锰共掺杂氧化亚铁纳米颗粒的高效太阳光诱导光催化剂。通过简单的共沉淀法制备了纯氧化亚铁和镧锰共掺杂氧化亚铁纳米颗粒。对光催化剂的形态、结构和磁性特征进行了分析。扫描电子显微镜分析表明形成了半球形纳米颗粒以及小的聚集体。使用透射电子显微镜测量纳米颗粒的尺寸，发现其在42 - 49纳米范围内。利用X射线衍射分析研究了合成纳米颗粒的晶体性质和几何形状。由于镧锰的掺入，纳米颗粒的饱和磁化强度和剩余磁化强度分别从6.17降至2.89 emu/g和从1.15降至0.52 emu/g，而矫顽力从756.72降至756.67 Oe。由于镧锰共掺杂，纳米颗粒的表面积从77.93增加到87.45 m/g。通过在太阳光照射下氧化亚铁、镧锰铁氧体和镧锰铁氧体催化剂降解罗丹明B（RhB）的能力来评估它们的光催化性能。在特定反应条件下（(RhB) = 50 ppm；(催化剂) = 40 mg/L；pH = 7；T = 25°C），镧锰铁氧体表现出优异的降解性能，在240分钟内将RhB降解至91.78%，相比之下，镧锰铁氧体为71.09%，原始氧化亚铁为58.21%。RhB的降解受到pH、催化剂量、染料浓度和温度变化的影响。发现RhB的降解符合准一级动力学。镧锰铁氧体催化剂优异的光催化性能表明，合成的纳米颗粒可有效用于去除工业废水中的有机污染物。
