吸附条件对几种活性碳纤维氧化还原吸附Cr(Ⅵ)的影响  

EFFECT OF ADSORPTION CONDITIONS ON THE ADSORPTION OF SEVERAL ACFS TO Cr(Ⅵ)

作　　者：王莹 曾汉民[1] 陆耘[1] 

机构地区：[1]中山大学材料科学研究所,广东广州510275

出　　处：《水处理技术》2000年第3期154-159,共6页Technology of Water Treatment

摘　　要：本文研究了吸附条件对几种基体的活性碳纤维 (Activated Carbon Fibers,简称ACF)氧化还原及吸附 Cr( )的影响。结果表明 :不同基体的 ACF不仅可以吸附 Cr( ) ,而且能部分地将其还原至低价态的 Cr( )。ACF吸附和还原的能力 ,尤其是还原能力与吸附条件紧密相关。Cr( )的吸附量强烈地依赖于溶液的 p H值 ,当 p H值低时 ,可有效增加 ACF对Cr( )的吸附量和还原量 ;氧化还原量可用能斯特方程来说明。Cr( )初始浓度的提高 ,也可提高 ACF对 Cr( )的吸附量 ;吸附动力学分析表明 ,ACF对 Cr( )In this paper, the effects of adsorption conditions on redox adsorption of Cr(Ⅵ) onto several kinds of activated carbon fibers (NACF, AACF, SACF AND VACF) were investigated. The results indicated that ACFs based on different precursor not only could adsorb Cr(Ⅵ), but also could partly reduce it into lower valent chromic ion. The adsorption and reductive ability of ACF closely depents on the adsorption conditions especially the latter. The adsorption capacity of Cr(Ⅵ) strongly relies on the pH value of solution. Under lower pH value, it could increase the adsorption amount and reduction amount of ACFs towards Cr(Ⅵ). The adsorption capacity of Cr(Ⅵ) on ACFs increased with the increase of concentration of Cr(Ⅵ). These effects of adsorption conditions can be characterized by Nernst equation. According to the dynamic analysis, the adsorption between ACF and Cr(Ⅵ) is firstly adsorption then reduction.

关 键 词：活性碳纤维 氧化还原 吸附 铬 水处理 净化 

分 类 号：TQ342.86[化学工程—化纤工业] TQ085.41