绿锈还原转化邻氯硝基苯实验研究

Reductive Transformation of O-chloronitrobenzene by Green Rust

摘要:

合成2种含有结构态Fe(Ⅱ)的化合物——硫酸盐绿锈(GRSO4)和碳酸盐绿锈(GRCO3),研究了它们对邻氯硝基苯(CNB)的还原转化能力,并探讨了反应途径和还原产物.实验表明,2种绿锈都能使邻氯硝基苯发生快速的还原转化,绿锈中的结构态Fe(Ⅱ)是主要的还原活性组分,GRSO4的还原能力明显大于GRCO3.还原产物主要为邻氯苯胺,绿锈被氧化为磁铁矿、针铁矿等含铁矿物.pH值对绿锈还原能力有重要影响,pH值升高有利于绿锈对CNB的还原.

关键词:零价铁; 绿锈; 催化还原; 邻氯硝基苯

Abstract:

The compounds containing structural Fe(Ⅱ) including sulphate Green Rust(GRSO4) and carbonate Green Rust(GRCO3) used in this study were synthesized in laboratory.The reducing capacity of GR for o-chloronitrobenzene(CNB) as well as the reaction pathway and products was investigated.Results show that reductive transformation of o-chloronitrobenzene by GRSO4 and GRCO3 is effective and the reducing capacity of GRSO4 is more than GRCO3,the structural Fe(Ⅱ) as the main active material.O-chloronitrobenzene is mainly transformed to o-chloroaniline after reaction,GR becomes the magnetite and goethite by oxidation reaction.pH is the important influence factor on the reducing capacity of GR and the rise of pH value can increase the reduction rate of CNB by GR.

Key words:zero valent iron; green rust; catalytic reduction; o-chloronitrobenzene