期刊
WATER SCIENCE AND TECHNOLOGY
卷 73, 期 3, 页码 493-500出版社
IWA PUBLISHING
DOI: 10.2166/wst.2015.509
关键词
copper; hydroxylamine; methyl orange; persulfate; sulfate radical
资金
- Program for New Century Excellent Talents in University [NCET-11-0082]
- National Natural Science Foundation of China [51508353, 51008052]
Cuprous copper [Cu(I)] reacts with sodium persulfate (PDS) to generate sulfate radical SO4-center dot, but it has been seldom investigated owing to its instability and difficulty in dissolving it. This study proposes a new method to regenerate Cu(I) from cupric copper [Cu(II)] by addition of hydroxylamine (HA) to induce the continuous production of radicals through active PDS, and investigates the resulting enhanced methyl orange (MO) degradation efficiency and mechanism in the new system. HA accelerated the degradation of MO markedly in the pH range from 6.0 to 8.0 in the HA/Cu(II)/PDS process. Both SO4-center dot and hydroxyl radicals (center dot OH) were considered as the primary reactive radicals in the process. The MO degradation in the HA/Cu(II)/PDS process can be divided into three stages: the fast stage, the transitory stage, and the low stage. MO degradation was enhanced with increased dosage of PDS. Although high dosage of HA could accelerate the transformation of the Cu(II)/Cu(I) cycle to produce more reactive radicals, excess HA can quench the reactive radicals. This study indicates that through a copper-redox cycling mechanism by HA, the production of SO4-center dot and center dot OH can be strongly enhanced, and the effective pH range can be expanded to neutral conditions.
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