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Oxidation of potassium n -butyl xanthate with ozone: Products and pathways

2016; Elsevier BV; Volume: 139; Linguagem: Inglês

10.1016/j.jclepro.2016.08.027

1879-1786

Pingfang Yan, Gangquan Chen, Maoyou Ye, Shuiyu Sun, Hongtao Ma, Weixiong Lin,

Analytical chemistry methods development

The mineral flotation wastewater containing residual potassium n-butyl xanthate (PBX) must be treated because of its biotoxicity, stench, and difficulty to be degraded. Treatment with ozone is an effective approach to remove PBX from wastewater. Therefore, the pathways of this pollutant toward the remediation technology must be considered. In this study, the effect of ozone concentration from different ozone generators (oxygen and air source ozone generators) on the PBX removal was studied. The conversion pathways of carbon and sulfur of PBX after complete oxidation are also discussed. The studies conducted using different ozone sources showed high PBX removal rate in both the cases. With increasing oxidation time, the residual concentration of PBX decreased. The removal rate increased in the presence of an oxygen source ozone generator. PBX did not mineralize completely, but decomposed into small organics and inorganics, thus decreasing the residual concentration of PBX. The analysis results of the total organic carbon, ion chromatography, gas chromatography–mass spectrometry (Agilent ChemStation software for data analysis) and ultra high-performance liquid chromatography with tandem quadrupole time of flight mass spectrometry (Waters MassLynx software for data analysis) indicate that after the ozone oxidation, 28.5% carbon of PBX converted into carbon dioxide and the rest carbon (71.5%) converted into n-butanol. 20.6% sulfur of PBX converted into gaseous sulfur, and the rest sulfur (79.4%) converted into sulfate ion.