【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(CTS)改性MAT制得负载壳聚糖的凹凸棒土(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Ni2+离子溶液的初始浓度、pH、吸附时间以及吸附温度对CMAT和CTS两种吸附剂吸附Ni2+离子性能的影响,得出了适宜的吸附条件。用IR对这两种吸附剂及其适宜条件下得到的吸附产物的结构进行了表征,并作了比较。结果表明,CMAT吸附Ni2+离子的适宜条件为:Ni2+离子溶液初始浓度40.0 mg/L,pH 4.03~6.04,吸附时间1.5 h,吸附温度25℃其最大吸附容量为15.2 mg/L;CTS吸附Ni2+离子的适宜条件为:Ni2+离子溶液初始浓度40.0 mg/L,pH3.00~4.12,吸附时间1.5 h,吸附温度35℃,其最大吸附容量为12.3 mg/L。在相同实验条件下,CMAT对Ni2+离子的吸附性能高于CTS,且二者的吸附行为均符合Langmuir吸附等温式。IR分析表明,CMAT对Ni2+离于的吸附包含化学吸附和物理吸附两个过程。而CTS主要是化学吸附。更多还原

【Abstract】 The modified attapulgite(MAT) was obtained from natural attapulgite(AT) with heat treatment and acidification of hydrochloric acid,and the attapulgite compound(CMAT) was prepared with MAT and chitosan(CTS).AT,MAT and CMAT were characterized by SEM and IR.The effects of initial concentration of Ni2+,pH,absorption time and absorption temperature on the adsorption capacity of the two adsorbents CMAT and CTS for Ni2+ were investigated,respectively.The optimum conditions of adsorption were obtained,and the samples after adsorption undr the optimum conditions were characterize by IR.The results showed that the optimum conditions of adsorption of CMAT were:initial concentration of Ni2+ 40.0 mg/L,pH 4.03~6.04,adsorption time 1.5 h and adsorption temperature 25℃.The optimum conditions of adsorption of CTS were:initial concentration of Ni2+ 40.0 mg/L,pH 3.00~4.12,adsorption time 1.5 h and adsorption temperature 35℃.Respectively,CMAT and CTS had the maximum adsorptive capacities of 15.2 and 12.3 mg/L under theis own optimum conditions.The adsorptive capacity of CMAT for Ni2+ was higher than that of CTS under the same conditions,and both of them obeyed the Langmuir equation.The results of IR indicated that both chemical and physical adsorption existed in the adsorption of CMAT for Ni2+,but chemical adsorption was dominant in the adsorption of CTS for Ni2+.更多还原