The Degradation Experiment of Rhodamine B by Peroxymonosulfate Activated with the Bio-char Derived from Textile Dyeing Sludge
Textile dyeing sludge derived catalysts(TDSA)were prepared using textile dyeing sludge to activate peroxymonosulfate(PMS)for degradation rhodamine B(RhB).In TDSA/PMS system,PMS can be activated towards RhB to achieve efficient degradation.The results showed the TDSA catalyst pyrolyzed under 600 ℃ exhibited the highest degradation efficiency among all catalyts.It was found that the degradation efficiency could be further increased by the addition of the dosage of both TDSA and PMS.TDSA could also be used with PMS towards RhB degradation in a wide range of both pH and reaction temperature.Quenching tests and electron paramagnetic resonance(EPR)detection demonstrated the coexistence of the reactive oxygen species of SO4-·,·OH and 1O2,among which·OH was identified as the dominant reactive species.These results revealed the role of Fe,C—C,C—O,C=O and C=C in TDSA catalysts.Both the functional groups(C—C,C—O and C=O)and Fe sites on the surface of TDSA promoted the release of·OH and SO4-·,while Fe sites might play a positive role in PMS activation to produce 1O2.The results of this study proved a new possible solution for the reuse of textile dyeing sludge,and broadened the path of disposal and resource utilization of solid organic sludge.
textile dyeing sludgepyrolysiscatalytic activationperoxymonosulfatedegradation of organic pollutants
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