Keikha Narges, Rezaeifard Abdolreza, Jafarpour Maasoumeh
Catalysis Research Laboratory, Department of Chemistry, Faculty of Science, University of Birjand Birjand 97179-414 Iran
RSC Adv. 2019 Oct 16;9(57):32966-32976. doi: 10.1039/c9ra05097c. eCollection 2019 Oct 15.
Two new pyridine and thiolate anchoring groups were prepared to functionalize γ-FeO nanoparticles for coordinative attachment of simple Fe(iii)- and Mn(iii)salophen complexes. Four new magnetically recoverable composites were characterized by several analytical techniques such as FT-IR, XRD, TGA, EDS compositional analysis and VSM to confirm superparamagnetic properties. TEM images revealed the nanostructure nature of composites with size ranging between 20 and 40 nm. A heterogeneous advanced oxidation process for degradation of some organic dyes as water pollution compounds using an aqueous solution of HO were successfully exploited. Several key parameters including the metal center in the salophen complex, initial pH, catalyst dosage, HO and dye concentration and temperature were investigated. A significant effect of the anchoring ligand on the degradation efficiency and catalyst stability was documented. The superior catalytic activity and particularly durability of the thiolate-based catalysts were demonstrated in comparison with their Py counterparts. Rate constants of 0.21, 0.17, 0.23 and 0.11 min were obtained for degradation of rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and crystal violet (CV). Finally, a photoluminescence probing technology and radical scavenging measurements were carried out to elucidate the active species involved in the process.
制备了两种新的吡啶和硫醇盐锚定基团，用于功能化γ-FeO纳米颗粒，以实现简单的Fe(iii)和Mn(iii) 双水杨醛缩邻苯二胺配合物的配位附着。通过傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）、热重分析（TGA）、能谱（EDS）成分分析和振动样品磁强计（VSM）等多种分析技术对四种新型磁可回收复合材料进行了表征，以确认其超顺磁性。透射电子显微镜（TEM）图像揭示了尺寸在20至40纳米之间的复合材料的纳米结构性质。成功开发了一种使用HO水溶液降解某些作为水污染化合物的有机染料的非均相高级氧化过程。研究了几个关键参数，包括双水杨醛缩邻苯二胺配合物中的金属中心、初始pH值、催化剂用量、HO和染料浓度以及温度。记录了锚定配体对降解效率和催化剂稳定性的显著影响。与基于吡啶的催化剂相比，硫醇盐基催化剂表现出优异的催化活性，尤其是耐久性。罗丹明B（RhB）、亚甲基蓝（MB）、甲基橙（MO）和结晶紫（CV）降解的速率常数分别为0.21、0.17、0.23和0.11 min。最后，进行了光致发光探测技术和自由基清除测量，以阐明该过程中涉及的活性物种。
