Comparison of phenol degradation by persulfate and peroxymonosulfate activated with coal gasification slag
Solid waste coal gasification slag(CGS)was used as an activator to construct coal gasification slag/persulfate(CGS/PDS)and coal gasification slag/peroxymonosulfate(CGS/PMS)systems.The microstructure and elemental composition of CGS were characterized by means of field emission scanning electron microscopy.CGS surface functional groups were characterized using Fourier transforms infrared spectroscopy and X-ray photoelectron spectroscopy.The effects of CGS dosage,PDS concentration,PMS concentration,and initial pH on phenol degradation rate were investigated.The activation pathway was speculated,and the oxidation mechanism was explored.The results showed that the Fe element content in CGS reached 11.9%and it contained multiple functional groups.With the increase of CGS dosage,the degradation efficiency of PDS and PMS for phenol gradually increased.When the dosage of CGS was 3.0g/L,the degradation rate of phenol reached 97.82%after 60min of reaction with 1.0mmol/L PDS,and 98.88%after 60min of reaction with 0.4mmol/L PMS.The degradation rates of phenol in both systems were highest at pH=3.The coexistence of Cl-promoted the degradation of phenol in both systems,while the coexistence of NO3-,SO42-and HCO3-inhibited the degradation of phenol.The CGS/PDS system produced·SO4-and·OH during the degradation of phenol,while the CGS/PMS system produced·SO4-,·OH,and·O2-.However,·SO4-dominated the degradation of phenol in both systems.The research can provide guidance for the high-value application of solid waste coal gasification slag,and also provide theoretical basis for the further application of coal gasification slag in water pollution control.
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