State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin, 124221, China.
State Key Laboratory of Fine Chemicals, School of Petroleum and Chemical Engineering, Dalian University of Technology, Panjin, 124221, China.
Carbohydr Polym. 2019 Apr 1;209:215-222. doi: 10.1016/j.carbpol.2019.01.032. Epub 2019 Jan 11.
Radioactive iodine from the nuclear wastes was the significant environmental pollution, causing the health concern. Cross-linked chitosan microspheres (CM) by emulsion polymerization were investigated and proposed as the green and efficient adsorbents to treat iodine wastes via I and -NH attraction. The I anions (instead of the radioactive iodine) adsorbed by CM were promising according to adsorbent dosage, pH, co-existing anions and recyclability analyzations through FTIR, SEM, BET and TGA. From pH 4 to 10, CMs maintained the I adsorption efficiency no less than 95%. The maximum adsorption capacity of I was up to 0.8792 mmol/g relative to the initial 2 mmol/L I at pH 5 during 40 min adsorption, well-fitting with Freundlich isotherm model and pseudo-second order kinetic model. Moreover, the CMs after five regenerations maintained almost the same adsorption efficiency, and performed the differently competitive-adsorbed behavior. The CMs thus were prospective adsorbents for the iodide removal from waste water.
核废料中的放射性碘是一种重要的环境污染物质，引起了人们对健康的关注。通过乳液聚合制备了交联壳聚糖微球（CM），并将其作为一种绿色高效的吸附剂，通过 I 和 -NH 吸引来处理碘废物。根据 FTIR、SEM、BET 和 TGA 分析的吸附剂用量、pH 值、共存阴离子和可回收性研究，CM 可以有效地吸附 I 阴离子（而不是放射性碘）。在 pH 值为 4 到 10 的范围内，CM 保持 I 吸附效率不低于 95%。在 40 min 的吸附时间内，pH 值为 5 时，CM 对初始浓度为 2 mmol/L 的 I 的最大吸附容量高达 0.8792 mmol/g，符合 Freundlich 等温吸附模型和拟二级动力学模型。此外，经过五次再生后，CM 仍保持几乎相同的吸附效率，并表现出不同的竞争吸附行为。因此，CM 有望成为去除废水中碘化物的吸附剂。
