3种高级氧化体系处理氯苯及其稳定中间体

在运用芬顿(Fe2+/H2O2)、亚铁离子活化过硫酸钠(Fe2+/PS)和碱活化过硫酸钠(NaOH/PS)3种氧化体系处理典型污染物氯苯(CB)时,发现了3种氧化体系在氧化CB过程中对氯苯酚中间体(4-CP)产生量存在较大差异.探究了氧化剂用量对3种氧化体系降解CB及中间体4-CP的影响,通过总有机碳和游离氯离子浓度变...

Treatment of chlorobenzene and its stable intermediate by three advanced oxidation systems

Using the three oxidation systems including Fenton (Fe2+/H2O2), ferrous ion activated sodium persulfate (Fe2+/PS) and alkali activated sodium persulfate (NaOH/PS) to treat the typical pollutant chlorobenzene (CB), we found there were big differences in the amount of p-chlorophenol intermediate (4-CP) produced during the oxidation of CB by the three oxidation systems. The effect of the oxidant dosage on the degradation of CB and its intermediate 4-CP by three oxidation systems was studied, and CB mineralization was characterized by the changes of the total organic carbon and free chloride concentration. The results showed that lots of stable 4-CP intermediates were produced in the oxidation systems of Fe2+/H2O2 or Fe2+/PS when the concentrations of H2O2 or PS were less than 1 mmol·L−1 and 5 mmol·L−1, respectively. While at the overdoses of H2O2 or PS, 4-CP could be further oxidized and decomposed. Being different from Fe2+/H2O2 and Fe2+/PS systems, NaOH/PS system oxidation did not lead to the yield of 4-CP intermediate. Being different from the oxidation process of Fe2+/PS system, the dechlorination reaction occurred during CB oxidation by NaOH/PS and Fe2+/H2O2 systems. In addition, the verification experiment of groundwater in the actual contaminated site showed that NaOH/PS was suitable for CB removal in the remediation process, and PS addition in batches for stepwise oxidation CB could achieve a high degradation efficiency of CB pollutants and avoid the generation of harmful intermediate of 4-CP.