Comparison of the Catalytic Performances of Different Commercial Cobalt Oxides for Peroxymonosulfate Activation During Dye Degradation

doi:10.1007/s40242-017-6413-6

Abstract

Abstract:

The catalytic performances of different commercial cobalt oxides(Co_xO_y, i.e., Co₂O₃, Co₃O₄, and CoO) for peroxymonosulfate(PMS) activation in dye degradation were compared in this study. The CoO/PMS system exhibited the highest catalytic oxidation performances with more than 96% methylene blue(MB) removal at 90 min. The concentration of dissolved cobalt ions from CoO was 1.474 mg/L at neutral pH and 5.231 mg/L at acidic pH at 90 min which accounted for the high MB removal and CoO activated PMS homogeneously compared to the associated CoSO₄/PMS. Co₃O₄ and Co₂O₃ exhibited similar catalytic performances and characteristics. The MB removal in Co₃O₄/PMS and Co₂O₃/PMS system were more than 88% at neutral pH and over 64% at acidic pH, respectively, in 90 min. The concentration of dissolved cobalt ions from Co₃O₄ and Co₂O₃ was less than 0.018 mg/L at neutral pH and 0.036 mg/L at acidic pH at 90 min. The MB removal achieved by Co₃O₄/PMS and Co₂O₃/PMS were approximately three times higher than that achieved by their associated CoSO₄/PMS systems and the heterogeneous catalysis played a principal role in the processes. According to scavenger experiments, the contributions of the hydroxyl radicals in the MB degradation were negligible compared to sulfate radicals in the CoO/PMS system. Hydroxyl radicals contributed one-third or more and sulfate radicals were the dominant oxidizing species in the Co₃O₄/PMS and Co₂O₃/PMS systems. Co_xO_y could also effectively activate PMS to generate free radicals for degradation of other dyes. The dyedegradation processes in Co₃O₄/PMS, Co₂O₃/PMS and CoSO₄/PMS systems followed pseudo-first-order kinetic model and dye degradation rates in different systems were also compared.

Key words: Cobalt oxide, Peroxymonosulfate, Dye, Heterogeneous catalysis, Degradation

ZHANG Botao, ZHANG Yang, XIANG Weixu, TENG Yanguo, WANG Ying. Comparison of the Catalytic Performances of Different Commercial Cobalt Oxides for Peroxymonosulfate Activation During Dye Degradation[J]. Chemical Research in Chinese Universities, 2017, 33(5): 822-827.

References

[1] Hu L., Yang F., Lu W., Hao Y., Yuan H., Appl. Catal., B, 2013, 134(4), 661
[2] Zhang B. T., Xiang W., Jiang X., Zhang Y., Teng Y., J. Environ. Eng., 2016, 142(4), 04016003
[3] Anipsitakis G. P., Dionysiou D. D., Environ. Sci. Technol., 2003, 37(20), 4790
[4] Zhang B. T., Lin J. M., Luminescence, 2010, 25(4), 322
[5] Zhang B. T., Zhao L., Lin J. M., Talanta, 2008, 74(5), 1154
[6] Yao Y., Cai Y., Wu G., Wei F., Li X., Chen H., Wang S., J. Hazard. Mater., 2015, 296, 128
[7] Ren Y., Lin L., Ma J., Yang J., Feng J., Fan Z., Appl. Catal., B, 2015, 165, 572
[8] Zhang B. T., Zhang Y., Teng Y., Fan M., Crit. Rev. Environ. Sci. Technol., 2015, 45(16), 1756
[9] Qi F., Chu W., Xu B. B., Chem. Eng. J., 2014, 235(1), 10
[10] Zeng T., Zhang X., Wang S., Niu H., Cai Y., Environ. Sci. Technol., 2015, 49(4), 2350
[11] Stoyanova M., Slavova I., Christoskova S., Ivanova V., Appl. Catal., A, 2014, 476(6), 121
[12] Anipsitakis G. P., Stathatos E., Dionysiou D. D., J. Phys. Chem. B, 2005, 109(27), 13052
[13] Chen X., Chen J., Qiao X., Wang D., Cai X., Appl. Catal., B, 2008, 80(1/2), 116
[14] Yang Q. J., Choi H., Dionysiou D. D., Appl. Catal., B, 2007, 74(1/2), 170
[15] Yang Q., Choi H., Chen Y., Dionysiou D. D., Appl. Catal., B, 2008, 77(3/4), 300
[16] Muhammad S., Saputra E., Sun H., Ang H. M., Tade M. O., Wang S., Ind. Eng. Chem. Res., 2012, 51(47), 15351
[17] Muhammad S., Saputra E., Sun H., Izidoro J. D. C., Fungaro D. A., Ang H. M., Tade M. O., Wang S., RSC Adv., 2012, 2(13), 5645
[18] Yu Z. Y., Bensimon M., Laub D., Kiwi-Minsker L., Jardim W., Mielczarski E., Mielczarski J., Kiwi J., J. Mol. Catal. A:Chem., 2007, 272(1/2), 11
[19] Muhammad S., Saputra E., Sun H., Ang H. M., Tade M. O., Wang S., Water, Air, Soil Pollut., 2013, 224(12), 1
[20] Hardjono Y., Sun H., Tian H., Buckley C. E., Wang S., Chem. Eng. J., 2011, 174(1), 376
[21] Lin C., Tian C., Liu Y., Luo W., Zhu M., Su Q., Liu M., Chem. Res. Chinese Universities, 2016, 32(1), 95
[22] Lin Y., Zhou F., Zhan S., Yang Y., Yin Y., Chem. Res. Chinese Universities, 2016, 32(2), 284
[23] Li B., Li L., Lin K., Zhang W., Lu S., Luo Q., Ultrason. Sonochem., 2013, 20(3), 855
[24] Liang C. J., Su H. W., Ind. Eng. Chem. Res., 2009, 48(11), 5558
[25] Shukla P. R., Wang S., Sun H., Ang H. M., Tade M., Appl. Catal. B, 2010, 100(3/4), 529