Wang Zhong-Ming, Chen Jia-Bin, Zhang Li-Ming, Li Wen-Wei, Huang Tian-Yin
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China.
Huan Jing Ke Xue. 2016 Jul 8;37(7):2591-2600. doi: 10.13227/j.hjkx.2016.07.023.
Activated carbon supported cobalt catalysts (Co/AC) were prepared through wet impregnation and high temperature calcination methods. The X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) characterization results showed that CoO was the major form of Co species distributed on AC. The performance of Co/AC was evaluated as catalyst to activate peroxymonosulfate (PMS) to produce sulfate radicals (SO·) for Orange G (OG) degradation in solution. The activation mechanism and several influential factors were also investigated. The results demonstrated that SO·played a dominant role in OG degradation. And the degradation efficiency of OG increased with increasing Co/AC dosage, higher PMS concentration or elevating reaction temperature. Initial pH had a significant effect on OG degradation, with pH range of 4 to 8 as the optimal pH for degradation. In addition, the strong acidic or alkaline conditions were unfavorable for OG degradation. A dual effect of chloride ions (Cl) was observed. The high Cl concentration promoted degradation, while low concentration led to inhibition. The Co/AC also exhibited excellent reusability and its activating performance toward PMS was still observed after 6 rounds of tests. Finally, the degradation process and intermediate products of OG were analyzed with UV-visible spectroscopy and gas chromatography-mass spectrometry (GC/MS).
