摘要
以二氧化锰为微波吸附剂,在密封体系中研究了微波辐射技术对六氯苯污染土壤的修复效果。分别以不同浓度的酸碱水溶液添加到土壤中,在模拟含水率为20%情况下,硫酸(50%)介质下六氯苯处理效果最好,10min的微波辐射即可使50mg/kg的六氯苯达到完全去除;但是在纯水和10mol/L氢氧化钠介质下,六氯苯基本上没有去除;随着硫酸浓度的降低,六氯苯的去除率显著降低。气相色谱/质谱联用(GC/MS)分析没有检测到新物质。六氯苯去除机理推测为,直接矿化或者HCB及其分解的中间产物同土壤发生化学结合而被固定起来,以致难以萃取出来。
Using MnO2 as adsorbent, the decomposition of hexachlorobenzene （HCB） in soil using microwave （MW） technology was studied in a sealed vial. In the presence of manganese dioxide （MnO2）, a strong oxidant and MW-absorbent, a complete removal of HCB was obtained by addition of H2SO4 （50%）, while no significant removal was observed for NaOH and H20 with 10 min MW. With the decrease of H2SO4 concentration, the removal of HCB decreased sharply. Gas chromatography/mass spectrum （GC/MS） analysis revealed no intermediates formed in all the processes. The fate of HCB was proposed to be mineralized to CO2 and H2O directly, or bounded to the soil tightly together with its decomposition intermediates.
出处
《环境保护科学》
CAS
2006年第2期49-52,共4页
Environmental Protection Science
基金
教育部"973"重点项目
编号104250
关键词
微波辐射
六氯苯
土壤修复
二氧化锰
Microwave Radiation Hexachlorobenzene Soil Remediation Manganese Dioxide
