Abstract View
Fabrication of Hollow Carbon Nanofiber Containing Metal Oxide Catalyst via Electrospinning and Thermal Treatment for Atmospheric VOCs Removal and Water Treatment
SANGMO KANG, Jungho Hwang, Yonsei university
Abstract Number: 126
Working Group: Nanoparticles and Materials Synthesis
Abstract
We propose a novel material which has high VOCs removal performance as an adsorbent and also as a catalytic oxidation agent. In addition, we propose a methodology of fabricating this material. By ejecting a PMMA solution containing manganese oxide (Mn3O4) precursor through the inner part of a dual nozzle while a PAN solution is delivered through the outer part, nanofibers impregnated with Mn3O4 (denoted as Mn3O4/NFs) are fabricated after the co-axial electrospinning (outer layer: PAN, inner layer: MnAc/PMMA). The Mn3O4/NFs are carbonized, become a hollow structure, and are activated (Mn3O4/HACNFs).Mn3O4 fabricated in this study are the most widely studied metal oxides due to the high activity, stability, relative low toxicity and redox properties. The fabricated Mn3O4/HACNFs are then tested for VOCs removal. The VOCs removal performance of is evaluated at low temperature (below 100 ) and high temperature (150~280 ), respectively, as a toluene adsorbent and a toluene oxidizing agent. The fabrication of Mn3O4/HACNFs using the dual nozzle co-axial electrospinning process is introduced for the first time, to the best of our knowledge.
A series of CoxMn3−xO4/HCNFs were also synthesized, and their catalytic performance in oxidative degradation of organic dye compounds in water was investigated. The results showed that, as an oxide composite of Co and Mn elements, CoMn2O4/HCNFs showed much stronger catalytic activity in peroxymonosulfate (PMS) oxidation than Co3O4, Mn3O4, and their physical mixture. Typically, the uses of 0.2 g/L CoMn2O4/HCNFs and 0.3 g/L PMS yielded a nearly complete removal of Rhodamine B (50 M) in 80 min at 25 ◦C. The efficiency of Rhodamine B decomposition increased with increasing temperature (15–55 ). Furthermore, CoMn2O4/HCNFs could maintain its catalytic activity in the repeated batch experiments. Moreover, hydroxyl and sulfate radicals participating in the process were evidenced using quenching experiments, and a rational mechanism was proposed. PMS oxidation with CoMn2O4 is an efficient technique for remediation of organic contaminants in wastewater.
The surface morphology and structure of the all nanofibers were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS).
This work was supported by Railroad Technology Research Program (18RTRP-B082486-05) funded by Ministry of Land, Infrastructure and Transport of Korean Government.
[1] Yao, Yunjin, et al. "Sulfate radicals induced from peroxymonosulfate by cobalt manganese oxides (CoxMn3− xO4) for Fenton-like reaction in water." Journal of hazardous materials 296 (2015): 128-137.
[2] Morales-Torres, Sergio, et al. "Coupling noble metals and carbon supports in the development of combustion catalysts for the abatement of BTX compounds in air streams." Catalysts 5.2 (2015): 774-799.