摘要
天然凹凸棒土（AT）经盐酸和热处理制得活化凹凸棒土（MAT）,以壳聚糖改性MAT制得复合吸附剂（CMAT）。用扫描电镜（SEM）和红外光谱（IR）对AT、MAT和CMAT的结构进行了表征。考察了磷酸盐溶液初始浓度、pH、吸附时间以及吸附温度对CMAT和MAT吸附磷酸根性能的影响,得出了适宜的吸附条件。用IR对适宜条件下吸附产物的结构进行了表征。结果表明,CMAT吸附磷酸根的适宜条件为：磷酸盐溶液初始浓度0.310 6 g.L-1,pH 4.70~6.72,吸附时间1 h,吸附温度35℃,在该条件下最大吸附容量为90.6 mg.g-1;MAT吸附的适宜条件为：磷酸盐溶液初始浓度0.2101 g.L-1,pH 3.61~5.81,吸附时间1 h,吸附温度35℃,在该条件下最大吸附容量为68.9 mg.g-1。在相同实验条件下,CMAT对磷酸根的吸附性能高于MAT,且二者的吸附行为均符合Langmu ir和Freund lich吸附等温式。IR分析表明,CMAT对磷酸根的吸附包含化学吸附和物理吸附两个过程,而MAT主要是物理吸附。
The modified attapulgite（MAT） was obtained by nature attapulgite（AT） and hydrochloric acid,the attapulgite compound（CMAT） was prepared with MAT and chitosan,and AT,MAT and CMAT were characterized by SEM and IR.The effects of initial concentration of phosphate,absorption time,pH and absorption temperature on the adsorptive capacity of the two adsorbents for phosphate were investigated,respectively.The optimum conditions of adsorption were obtained,and the products obtained under the optimum conditions were characterized by IR.The results showed that the optimum conditions of adsorption of CMAT were：initial concentration of phosphate 0.310 6 g·L-1,pH 4.70～6.72,adsorption time 1 h and adsorption temperature 35 ℃.The optimum conditions of adsorption of MAT were：initial concentration of phosphate 0.210 1 g·L-1,pH 3.61～5.81,adsorption time 1 h and adsorption temperature 35 ℃.The adsorptive capacity of CMAT for phosphate was higher than that of MAT under the same conditions,and both of them obeyed the Langmuir and Freundlich equations.The results of IR indicated that both chemical and physical adsorption existed in the adsorption of CMAT for phosphate,but physical adsorption was dominant in the adsorption of MAT for phosphate.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2010年第8期1009-1014,共6页
Chemical Research and Application
基金
江苏省滩涂生物资源与环境保护重点建设实验室开放课题(JLCBE09017)资助项目
江苏省高校"青蓝工程"资助项目
关键词
凹凸棒土
壳聚糖
改性
磷酸盐
吸附
attapulgit
chitosan
modification
phosphate
adsorption
