共存离子对生物沉淀法硫化纳米零价铁降解三氯乙烯的影响

Effect of coexisting ions on trichloroethylene degradation by sulfidated nano zero-valent iron prepared by biological precipitation

采用生物沉淀法制备了生物硫化纳米零价铁(BP-S-nZVI),用SEM、TEM、XPS和BET等进行了表征,考察了BP-S-nZVI的材料特征。与化学法制备的S-nZVI进行对比实验,通过调控离子浓度,探究了在不同共存离子(NO^(-)_(3),SO^(2-)_(4),Mg^(2+),Ca^(2+))对两种材料降解三氯乙烯(TCE)的影响。结果表明,NO^(-)_(3),SO^(2-)_(4),Mg^(2+)对两种材料降解TCE均体现出促进降解的作用,而Ca^(2+)体现出抑制的效果。共存离子对S-nZVI降解TCE反应的干扰程度更强,对BP-S-nZVI降解TCE的作用很微弱。与传统化学法制备的S-nZVI相比,BP-S-nZVI具有更好的吸附性能,更优的降解效果以及更强的环境稳定性,是一种绿色环保、具有理想应用前景的环境纳米材料。

Using biological precipitation method to prepare biovulcanized nano zero-valent iron.The materials were characterized by SEM,TEM,XPS,and BET,and the material characteristics of BP-S-nZVI were investigated.A comparative experiment was conducted with S-nZVI prepared by chemical method to investigate the effect of different coexisting ions(NO^(-)_(3),SO^(2-)_(4),Mg^(2+),Ca^(2+))on the degradation of TCE by the two materials in the presence of environment by regulating ion concentration.The results showed that NO^(-)_(3),SO^(2-)_(4),Mg^(2+)showed a promoting effect on the degradation of TCE by both materials,while Ca^(2+)showed a inhibiting effect.Moreover,coexisting ions had a stronger interference degree on the degradation of TCE by S-nZVI,and had a weak effect on the degradation of TCE by BP-S-nZVI.Compared with S-nZVI prepared by traditional chemical methods,BP-S-nZVI has better adsorption performance,better degradation effect,and stronger environmental stability.It is a green and environmentally friendly environmental nanomaterial with ideal application prospects.