热活化过硫酸钠耦合甲酸技术研究--处理水溶液中四氯化碳与六价铬污染

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Abstract

Carbon tetrachloride (CT) and hexavalent chromium removal performances were investigated by the thermal activation of persulfate, in the presence of formic acid to turn the oxidizing capacity of the reaction mixture into a reductive one by the generation of carbon dioxide anion radicals (CO₂^·-). The Effects of initial concentrations of persulfate and formic acid on CT and Cr(VI) removal were evaluated respectively. For single pollutant system, when the initial persulfate and formic acid concentrations were both 100mmol/L, CT and Cr (VI) could be almost completely removed in 120min and 60min at 50℃, respectively. In addition, the removal efficiencies of CT and Cr (VI) increased with increasing persulfate and formic dosage. For the combined pollutants system, CT degradation efficiency was found to decrease with increasing Cr (VI) concentrations. However, Cr (VI) removal was increased with an increase in CT concentrations. CT degradation was inhibited with the addition of methyl viologen as CO₂^·- scavenger, while an enhanced Cr (VI) reduction was observed, indicating that the addition of organic substances may shift to favor Cr (VI) removal in thermally-activated persulfate/formic process.

Key words： carbon tetrachloride Cr(VI) thermally-activated persulfate carbon dioxide anion radicals

Received: 26 January 2016

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