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, Dalian University of Technology, Dalian 116024, China.
Carbohydr Polym. 2020 Apr 15;234:115926. doi: 10.1016/j.carbpol.2020.115926. Epub 2020 Jan 30.
Radioactive iodine waste from nuclear plant became the severe environmental problem and led to the public health concern. The cross-linked chitosan adsorbed iodide anions through the electrical attraction, yet performing limited-efficiently. Targeting as the better adsorption, the modified chitosan sorbent as AgCl@CM (silver chloride entrapped in the cross-linked chitosan microspheres) for iodine adsorption was proposed and implemented by chemisorption from AgCl and physisorption from chitosan via the improved emulsion method (emulsions mixing-collision and polymerization). With the broad application from pH 2 to pH 10, the spherical AgCl@CM (from 0.20 g silver nitrate) performed the I anions (instead of radioactive iodine) adsorption efficiency of higher than 90 % in 20 min, with the maximum adsorption capacity of 1.5267 mmol/g, well-fitting with the pseudo-first-order model and Sips isothermal model. AgCl@CM also performed I adsorption with the significant selectivity relative to Cl. The micro-spherical AgCl@CM sorbents were therefore prospective-effectively for iodine waste water treatment.
核电站产生的放射性碘废物成为严重的环境问题，并引起了公众健康关注。交联壳聚糖通过静电吸引吸附碘阴离子，但效率有限。为了实现更好的吸附效果，提出了用化学吸附法（AgCl 的化学吸附和壳聚糖的物理吸附）通过改进的乳液法（乳液混合-碰撞和聚合）将银氯@CM（银氯包埋在交联壳聚糖微球中）作为碘吸附的改性壳聚糖吸附剂。AgCl@CM（由 0.20 克硝酸银制成）具有从 pH 2 到 pH 10 的广泛应用，在 20 分钟内对碘阴离子（而非放射性碘）的吸附效率高于 90%，最大吸附容量为 1.5267mmol/g，与拟一级动力学模型和 Sips 等温模型拟合良好。AgCl@CM 对 Cl 也表现出显著的选择性。因此，微球形 AgCl@CM 吸附剂有望有效处理含碘废水。
