以碱木质素（AL）为原料，经1，2?二氯乙烷、亚氨基二乙酸（IDA）改性制得多齿配体改性碱木质素（ AL?IDA）吸附材料，用FT?IR、热重和氮吸附技术对其结构进行表征．通过静态吸附实验，考察了pH值、吸附时间、Hg2＋和Cd2＋初始浓度、温度和共存离子等因素对AL?IDA吸附Hg2＋、Cd2＋效果的影响．结果表明，溶液pH值对AL?IDA的吸附性能有显著影响，最适宜pH值范围是5．0—6．0；吸附平衡时间为8 h，吸附动力学可以用准二级动力学模型描述和预测；Langmuir方程可以较好地描述AL?IDA对Hg2＋、Cd2＋的吸附；在pH值为5、初始浓度为300 mg·L－1、温度为25℃时，对Hg2＋和Cd2＋最大吸附容量分别为239．5 mg·g－1、129．2 mg·g－1；温度升高，吸附容量增大，AL?IDA吸附Hg2＋、Cd2＋的表观活化能分别为22．49 kJ·mo1－1和23．28 kJ·mo1－1，表明吸附主要为化学作用．AL?IDA对重金属Hg2＋、Cd2＋主要吸附机理是离子交换作用和表面络合．
A novel chelating ligand modified alkali lignin ( AL?IDA ) adsorbent from alkali lignin (AL) was prepared using 1,2?dichloroethane and iminodiacetic acid (IDA). The adsorbent was characterized by Fourier?transformed infrared spectroscopy ( FT?IR ) , thermogravimetric analysis ( TG) and N2 adsorption techniques. The effect of various parameters on Hg2+/Cd2+ adsorption process such as initial pH, contact time, initial Hg2+/Cd2+concentration, temperature and coexisting ions were investigated in detail through static batch experiments. The results indicated that the adsorption processes of Hg2+/Cd2+ on AL?IDA were strongly dependent on the coexisting ion concentration and pH, and the optimal pH value was between 5. 0 and 6. 0. The adsorption equilibrium was achieved at 8 h. The sorption kinetic experimental data were best described by the pseudo?second?order model, and the isotherm adsorption equilibrium of AL?IDA was followed by Langmuir isotherm equation. The maximum adsorption capacity obtained was 129.2 mg·g-1 for Cd2+and 239.5 mg·g-1 for Hg2+ at pH 5 when the initial metal concentration was 300 mg·L-1 and the temperature was 298 K. The adsorption capacity of AL?IDA for Hg2+/Cd2+ increased with increasing temperature. The activation energy of adsorption on AL?IDA was 22. 49 kJ·mo1-1 for Hg2+ and 23.28 kJ·mo1-1 for Cd2+, respectively, which indicated that the adsorption was mainly chemical action. The adsorption mechanisms were ion exchange and chelation between Hg(Ⅱ)/Cd(Ⅱ) and AL?IDA.
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