Material Science and Engineering College, Northeast Forestry University, Harbin, 150040, P.R. China.
Key Laboratory of Bio-based Material Science and Technology Ministry of Education, Northeast Forestry University, Harbin, 150040, P.R. China.
Sci Rep. 2017 Jun 27;7(1):4303. doi: 10.1038/s41598-017-04436-8.
Nanofibrillated chitin/AgO aerogels were fabricated for radioiodine removal. Chitin was first fabricated into nanofibers with abundant acetyl amino groups (-NHCOCH) on the surface. Then, highly porous chitin nanofiber (ChNF) aerogels were obtained via freeze-drying. The ChNF aerogels exhibited a low bulk density of 2.19 mg/cm and a high specific surface area of 179.71 m/g. AgO nanoparticles were evenly anchored on the surfaces of ChNF scaffolds via strong interactions with -NHCOCH groups, subsequently yielding AgO@ChNF heterostructured aerogels. The composites were used as efficient absorbents to remove radioiodine anions from water and capture a high amount of I vapor in the forms of AgI and iodine molecules. The adsorption capacity of the composite monoliths can reach up to 2.81 mmol/g of I anions. The high adsorbability of the composite monolithic aerogel signifies its potential applications in radioactive waste disposal.
纳米纤维状壳聚糖/AgO 气凝胶被制备用于去除放射性碘。壳聚糖首先被制成表面带有丰富乙酰氨基（-NHCOCH）的纳米纤维。然后，通过冷冻干燥得到具有高孔隙率的壳聚糖纳米纤维（ChNF）气凝胶。ChNF 气凝胶的体密度低至 2.19mg/cm，比表面积高达 179.71m/g。AgO 纳米颗粒通过与 -NHCOCH 基团的强烈相互作用均匀地锚定在 ChNF 支架的表面上，从而生成 AgO@ChNF 杂化结构气凝胶。该复合材料被用作高效的吸附剂，用于从水中去除放射性碘阴离子，并以 AgI 和碘分子的形式捕获大量的 I 蒸气。复合整体式的吸附容量可达 2.81mmol/g 的碘阴离子。这种复合材料的高吸附能力表明其在放射性废物处理方面具有潜在的应用。
