SONGShuang,YANBo-yin,WANGSong-xue,et al.Efficient Degradation of Methyl Orange via Peroxymonosulfate Activated by Cobalt Oxide Loaded on GAC[J].China Water & Wastewater,2022,38(8):73-81.
Efficient Degradation of Methyl Orange via Peroxymonosulfate Activated by Cobalt Oxide Loaded on GAC
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第8期
Page:
73-81
Column:
Date of publication:
2022-04-17
- Abstract:
- In order to solve the separation and recovery difficulty of metal oxide powder catalyst and its poor stability in wastewater treatment, cobalt oxide was loaded onto granular activated carbon (GAC) as Co@GAC by impregnation?calcining method to activate peroxymonosulfate (PMS) efficiently. The morphology and structure of Co@GAC prepared at different calcination temperatures were characterized by scanning electron microscopy (SEM) and etc., and the effect of different calcination temperatures on the catalytic performance of Co@GAC was investigated with methyl orange as the target pollutant. The effects of initial pH, methyl orange concentration, PMS and Co@GAC dosage on the degradation of methyl orange were also investigated. The results show that when the initial pH, the concentrations of methyl orange and PMS, dosage of Co@GAC calcined at 500 ℃ were 7.0, 20 mg/L, 0.1 mmol/L, and 1 g/L, respectively, the degradation rate of methyl orange reached 97.1% after 25 minutes. The results of free radical quenching experiments showed that sulfate radicals (SO4·-) produced in the Co@GAC/PMS system played a major role in the degradation of methyl orange, while the contribution of hydroxyl radicals (·OH) was relatively small. In addition, the results of repeated experiments showed that Co@GAC has favorable catalytic stability and could be applied repeatedly, which has great application potential in the field of water treatment.
Last Update:
2022-04-17