Degradation of Acid Orange 7 in Water by Granular Activated Carbon Activated Sodium Persulfate
The degradation efficiency and mechanism of Acid Orange 7(AO7)in water by granular activated carbon activat-ed sodium persulfate were studied.Reaction conditions such as GAC content,PS concentration and pH value on the degrada-tion were investigated.The results showed that when GAC was 0.4 g/L,molar ratio of persulfate to AO7 of 15∶1,and reaction time of 150 min,the removal rate of AO7 reached 96.1％.Under the condition of pH 3～9,the removal of AO7 can achieve good results.Quenching results show that in addition to OHand SO4·-,non-free radical pathways such as singlet oxygen and surface-bound SO4·-also involved in the degradation of AO7.The results of XPS showed that C—O and π*may act as ac-tive sites involved in AO7 degradation in the system.
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