黄原胶-丙烯酰胺接枝共聚物对Cr^(3+)的吸附性能  

Adsorption Characteristic of Graft Copolymers of Xanthan Gum and Acrylamide for Cr^(3+)

作　　者：程磊[1] 李仲谨[1] 王磊[1] 

机构地区：[1]陕西科技大学化学与化工学院教育部轻化工助剂化学与技术重点实验室,陕西西安710021

出　　处：《精细化工》2009年第10期1012-1015,1027,共5页Fine Chemicals

基　　金：陕西省科技计划项目(2008K06-15);"十一五"国家科学技术支撑计划项目(2006BAD09B04);陕西科技大学研究生创新基金~~

摘　　要：研究了黄原胶-丙烯酰胺接枝共聚物(XG-g-AM)对Cr3+的静态吸附行为,考察了pH(1.0~8.0)、吸附温度(298~318 K)、吸附时间(0~12 h)和Cr3+初始浓度(0.01~0.20 mol/L)等因素对XG-g-AM吸附Cr3+性能的影响。利用傅立叶变换红外光谱仪(FT-IR)和X射线衍射仪(XRD)对吸附产物进行了结构表征,探讨了吸附机理。在pH=6.0,Cr3+初始浓度为0.20 mol/L,常温吸附12 h的条件下,XG-g-AM对Cr3+的吸附量达205.40 mg/g。XG-g-AM对Cr3+吸附行为符合Freundlich吸附等温方程,XG-g-AM通过静电作用、配位吸附方式吸附Cr3+,吸附Cr3+破坏了XG-g-AM的结晶结构,使其结晶度下降。Cr3+以非结晶态形式在XG-g-AM上聚集存在。The static adsorption behavior of Cr^3＋ on the graft copolymers of xanthan gum and acrylamide（XG-g-AM） was investigated.The effects of various factors,such as pH value（1.0～8.0）,adsorption temperature（298～318 K）,adsorption time（0～12 h） and initial Cr^3＋ concentration（0.01～0.20 mol/L） on the adsorption behavior were investigated respectively.The product after adsorption was characterized by Fourier Transform Infrared Spectroscopy（FT-IR） and X-ray Diffraction（XRD）.The mechanism of adsorption was discussed.Under the conditions of pH = 6. 0, room temperature, adsorption time 12 h and initial Cr^3＋ concentration 0. 20 mol/L,the adsorption capacity for Cr^3＋ 205.40 mg/g. The adsorption characteristic of XG-g-AM for Cr^3＋ is adapted to adsorption isotherm equation. The XG-g-AM absorbs Cr^3＋ by means of electrostatic coordination adsorption. The trivalent chromium ions may coordinate with amide linkage was found to be the Freundlich interaction and and hydroxyl of XG-g-AM. The crystal structure of XG-g-AM has been destroyed after adsorbing Cr^3＋ and the crystallinity of XG-g-AM has decreased. The trivalent chromium ions congregate on the resin, but are not crystallized.

关 键 词：黄原胶 接枝共聚物 吸附 CR^3+ 机理 

分 类 号：O636.1[理学—高分子化学]