甘蔗渣负载纳米零价铁吸附剂去除水中Cr(Ⅵ)的研究

STUDY ON ADSORPTION OF Cr( Ⅵ) IN AQUEOUS SOLUTION BY BAGASSE SUPPORTED NANOSCALE ZERO- VALENT IRON

以改性甘蔗渣做载体,采用液相还原法制备负载型纳米零价铁吸附剂,研究了原甘蔗渣、改性甘蔗渣、纳米零价铁及纳米零价铁/改性甘蔗渣4种物质对于水中Cr(Ⅵ)的吸附特性,探讨了反应时间、溶液pH值、固液比、Cr(Ⅵ)初始浓度等因素对于Cr(Ⅵ)吸附效果的影响。实验结果表明:4种吸收剂中,纳米零价铁/甘蔗渣的吸附能力最好,在pH=4,固液比=0.5 g/L,Cr(Ⅵ)初始浓度小于25 mg/L时,可全部去除Cr(Ⅵ)。并对甘蔗渣基纳米零价铁和Cr(Ⅵ)的反应机理进行了初探。

The modified bagasse supported nanoscale zero-valent iron（ modified bagasse-NZVI） was prepared by liquid phase reduction method,and the Cr（ Ⅵ） adsorbing behaviors of raw bagasse,modified bagasse,NZVI and modified bagasse-NZVI were described. The effect of pH,reaction time,solid to liquid ratio and Cr（ Ⅵ） initial concentration on Cr（ Ⅵ） adsorbing capacity were evaluated. The results indicate that highest reactivity was observed when using modified bagasse-NZVI,when pH was at 4. 0,solid to liquid ratio was 0. 5 g / L,and Cr（ Ⅵ） initial concentration was 25 mg / L. The reaction mechanism between modified bagasse-NZVI and Cr（ Ⅵ） was preliminary studied.