球状壳聚糖负载噻二唑树脂的合成及其吸附性能

Synthesis of Crosslinked Chitosan-Supported Thiadizole Heterocyclic Functional Chelating Resin and Its Adsorption Properties

用苯甲醛保护胺基后,将2氨-基-5-巯基-1,3,4噻-二唑引入到大孔壳聚糖微球上,合成了亲水性的多孔球状吸附树脂(CTS-AMT)。对比研究了CTS-AMT和母体微球(CTS)对Zn2+、Cu2+、Cd2+、Pb2+、Ag+和Hg2+的吸附性能。结果表明,pH=5.0,T=298.15 K时,CTS-AMT树脂对上述金属离子的吸附在1.5 h内基本达到平衡,对金属离子Hg2+、Ag+和Pb2+的静态饱和吸附量分别为2.54、2.31和1.71 mmol/g。在实验浓度范围内该树脂对Hg2+的吸附过程符合Langmu ir等温吸附模型。

A new hydrophilic functional chelating resin（CTS-AMT） with heterocyclic group were synthesized by the graft reaction between 2-amino-5-mercapto-1,3,4-thiadizole（AMT） and macroporous Schiff base chitosan（CTS）-chelated bead.The structure of the resin was confirmed by FTIR spectra and elemental analysis.The adsorption property and the selectivity of CTS-AMT and the parent chitosan for Cd2＋,Zn2＋,Cu2＋,Pb2＋,Ag＋ and Hg2＋ were compared.The experimental results show that CTS-AMT has a higher adsorption capacity and a better selectivity than CTS as expected.In the solution of pH=5.0,T=298.15 K,the adsorption of resin on metal ions can be accomplished in about 1.5 h.The static adsorption capacities for Hg2＋,Ag＋ and Pb2＋ are 2.54,2.31,and 1.71 mmol/g,respectively.It shows that the adsorption isotherms approximately follows Langmuir isotherm equation under the experimental concentrations.