土壤理化性质对Fe~0还原硝基苯的影响

采用零价铁（Fe0）还原降解土壤中的硝基苯,考察土壤理化性质对还原效果的影响。结果显示,当2 g土壤中NB含量约为2.5×10-6mol/g,铁粉用量为50 mg,土壤含水量为75%时,控温25℃条件下反应1 h,硝基苯在松砂土和中壤土中的还原率分别可达到82.9%和91.1%。硝基苯在2种土壤中的还原率表现出中壤土〉松砂土的规律;土壤微生物和土壤有机质含量升高有利于反应进行;粒径偏小的中壤土中硝基苯还原较彻底。NB在土壤中的老化时间对Fe0还原效果影响较小。

Effects of physical and chemical soil properties on reduction of NB with Fe~0

Zero-valent iron（Fe0） was utilized for the reduction of nitrobenzene（NB） in soil.The effects of physical and chemical soil properties were investigated.When the initial concentration of NB in 2 g of soil was 2.5×10-6mol/g,the dosage of Fe0 was 50 mg and soil moisture content was 75%,the reduction rate of nitrobenzene respectively reached as high as 82.9% and 91.1% in medium loam and light sand after a incubation at 25 ℃ after 1 hour.The rule of NB reduction rate in two kinds of soils was medium loamlight sand.Laboratory data showed that soil microorganisms as well as a higher organic matter content of soil seemed to promote more reduction of NB.Finer sizes of soil particles tended to promote a complete reduction of NB.The efficiency of reduction was not affected by NB aging time in the soils.