化工环保2025，Vol.45Issue(4)：517-523,7.DOI:10.3969/j.issn.1006-1878.2025.04.009
多孔炭负载高分散纳米零价铁去除水中Cr(Ⅵ)
Removal of Cr(Ⅵ)from water using porous carbon material-supported highly dispersed nano zero-valent iron
摘要
Abstract
Porous carbon material-supported highly dispersed nano zero-valent iron(PCM-nZVI)was prepared by the pyrolysis method and was applied for the adsorption and removal of Cr(Ⅵ)in an aqueous solution.The characterization results show that PCM-nZVI is spherical and hollow in structure,containing a large number of cavities,and nZVI is dispersed on the surface or in the pores of PCM,with a specific surface area of 222.80 m2/g.The removal rate of Cr(Ⅵ)increases with the increase of the addition amount of PCM-nZVI and decreases with the increase of pH(2.0-9.0).When the initial pH was set to 4.0,with a potassium dichromate mass concentration was 10 mg/L and a PCM-nZVI addition amount of 1.0 g/L,the Cr(Ⅵ)removal rate is close to 100%after 400 min of adsorption.After five cycles of experiments,the removal rate of Cr(Ⅵ)by PCM-nZVI decreases to 74.4%.The adsorption process of PCM-nZVI for Cr(Ⅵ)conforms to the pseudo-second-order kinetic equation and Langmuir model and belongs to monolayer adsorption.At 25℃,the saturated adsorption capacity of PCM-nZVI for Cr(Ⅵ)is 87.32 mg/g.The adsorption process is spontaneous and exothermic.Under acidic conditions,the nZVI in PCM-nZVI could reduce Cr(Ⅵ)to Cr(Ⅲ).关键词
纳米零价铁/多孔炭/Cr(Ⅵ)/还原/吸附Key words
nano zero-valent iron/porous carbon/Cr(Ⅵ)/reduction/adsorption分类
资源环境引用本文复制引用
吴涵,李士凤,王海博,姚淑华..多孔炭负载高分散纳米零价铁去除水中Cr(Ⅵ)[J].化工环保,2025,45(4):517-523,7.基金项目
辽宁省教育厅面上项目(LJKMZ20220763). （LJKMZ20220763）
