海藻酸钠基材料的制备及对金属离子的吸附

Preparation of Sodium Alginate-based Materials and Adsorption of Metal Ions

采用海藻酸钠作为原材料,使用丙烯酰胺进行化学改性制备海藻酸钠交联丙烯酰胺材料(SA-PAM)。使用红外分析、扫描电镜-能谱仪、元素分布特征和热重分析进行表征,并使用SA-PAM材料对水体中铜和铅离子进行吸附。结果表明,当溶液pH对铜和铅离子分别为5和5.5、初始铜和铅离子浓度为100 mg/L和300 mg/L和吸附时间为2 h时,SA-PAM对铜和铅离子的最大吸附量分别为58.84 mg/L和230.706 mg/L。SA-PAM吸附剂的吸附过程符合拟二阶动力学方程和Langmuir等温线模型,表明其吸附以单层化学吸附为主。此外,经过五次循环实验,SA-PAM材料仍能保持较好的吸附能力。

Sodium alginate was used as raw material and acrylamide was chemically modified to prepare sodium alginate crosslinked acrylamide material(SA-PAM). The FTIR, SEM-EDS, Mapping and thermogravimetric were used to characterize the material, and SA-PAM material was employed to perform adsorption experiments on copper ions and lead ions in water. The results showed that when the pH of solution was 5 and 5.5, the initial concentrations were 100 mg/L and 300 mg/L for copper ions and lead ions and the adsorption time was 2 h, SA-PAM had the best adsorption effect. The maximum adsorption capacity was 58.84 mg/L and 230.706 mg/L, respectively. The adsorption kinetics and isotherm of SA-PAM materials showed that Pseudo-second-order kinetic and The Langmuir isotherm model had the best fitting effect, which indicated the adsorption process was monolayer and chemical process. In addition, after five cyclic experiments, the SA-PAM material still maintained a good adsorption capacity.