College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China.
Environ Sci Pollut Res Int. 2018 Jun;25(18):17425-17433. doi: 10.1007/s11356-018-1932-3. Epub 2018 Apr 14.
Taro stalks (TS) were modified by diethylenetriamine (DETA) to obtain the modified taro stalks adsorbents (recorded as MTSA). This kind of raw material is unprecedented and the method of modification is relatively simple. The physicochemical properties of MTSA were characterized by scanning electron microscope (SEM), FTIR, and zeta potential analyzer. The capacity of MTSA for adsorbing heavy metals under different influencing factors was tested by UV-visible spectrophotometer. The results indicated that the gaps between the microspheres of MTSA are more, which are conducive to adsorption. The MTSA might have increased the amino-functional groups which are beneficial for adsorption, resulting in an increase in the adsorption capacity of copper and nickel ions (35.71 and 31.06 mg/g) of about 5-7 times compared to bare taro stalks (5.27 mg/g and 6.08 mg/g). High Cu uptake on MTSA was observed over the pH range of 5.5-7.0, while for Ni the range was 7.0-8.5, and the optimum dosage of adsorbent were both about 0.80 g for Cu and Ni. The adsorption kinetics of Cu and Ni on MTSA could be interpreted with a pseudo-second order and the equilibrium data were best described by the Langmuir isotherm model. Graphical abstract ᅟ.
芋梗（TS）经二乙烯三胺（DETA）改性得到改性芋梗吸附剂（记录为 MTSA）。这种原料是前所未有的，改性方法比较简单。通过扫描电子显微镜（SEM）、FTIR 和动电位分析仪对 MTSA 的物理化学性质进行了表征。通过紫外可见分光光度计测试了不同影响因素下 MTSA 对重金属的吸附能力。结果表明，MTSA 的微球之间的间隙更大，有利于吸附。MTSA 可能增加了有利于吸附的氨基官能团，导致铜和镍离子的吸附容量（35.71 和 31.06 mg/g）比原芋梗（5.27 和 6.08 mg/g）增加了约 5-7 倍。在 pH 值为 5.5-7.0 的范围内，MTSA 对 Cu 的吸附效果较好，而在 pH 值为 7.0-8.5 的范围内，Ni 的吸附效果较好，最佳吸附剂用量均约为 0.80 g。Cu 和 Ni 在 MTSA 上的吸附动力学可以用拟二级动力学模型来解释，平衡数据最好用 Langmuir 等温模型来描述。
