二硫代氨基甲酸盐树脂的合成及其对废水中Fe^(3+)、Co^(2+)、Mn^(2+)的吸附性能研究

Synthesis and Adsorption Performance of Dithiocarbamate Resin Towards Waste Water Containing Fe^(3+),Co^(2+) and Mn^(2+)

以D309树脂为原料,采用甲醇-水溶液法合成二硫代氨基甲酸盐(DTCR)树脂,利用红外光谱和扫描电镜对其结构进行了表征,测试了合成树脂对废水中Fe3+、Co2+、Mn2+的吸附性能,并通过等温吸附实验和动力学实验考察了合成树脂对金属离子的吸附去除能力随接触时间的变化情况和吸附机理。研究表明,该树脂对Fe3+、Co2+、Mn2+的吸附符合Langmuir等温线,在25℃下最大吸附量可分别达25.07、20.58、41.87mg/g,吸附速率较快,吸附4h均可达到吸附平衡;在二元金属离子混合体系中,树脂对3种金属离子的吸附关系遵守Mn2+>Co2+>Fe3+的基本关系;Ca2+、Mg2+干扰离子存在情况下,树脂对Co2+的去除率基本不变,维持在97%左右,树脂对Fe3+的去除率得到提高,由50%上升到98%,而树脂对Mn2+的去除率反而下降,由92%下降到80%。

Dithiocarbamate （DTCR） resin was synthesized using primary amine resin D309 in methanol-water solution way and characterized by FTIR and SEM. Adsorption mechanism and ion removal ability of DTCR were investigated by isothermal adsorption experiments and kinetics experiments. The results obtained from the equilibrium isotherms adsorption studies on three metal ions of Fe3＋ , Mn2＋ and Coz＋ indicate that the adsorption conforms to the Langmuir isotherm equation. The maximal absorption capacity for Fe2＋ , Mn2＋ and Co2＋ reaches up to 25.07, 20.58 and 41.87 mg/g at 25 ℃, respectively. The kinetics experiments show that DTCR has a high adsorption rate and the adsorption reaches equilibrium in 4 h. In the dual metal ions system, the order of the adsorption selectivity for the three metal ions is Mn2＋〉 Co2＋〉Fe3＋. In the presence of Ca2＋ and Mg2＋, the removal rate of Co2＋ stays at 97%, and the removalrate of Fe3＋ rises from 50% to 98%, but the removal rate of Mn2＋ declines from 92% to 80% under competitive conditions.