Fiber and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44, Stockholm, Sweden.
Department of Marine Sciences, Lovén Centre for Marine Sciences - Tjärnö, University of Gothenburg, SE-452 96, Strömstad, Sweden.
Carbohydr Polym. 2020 Dec 1;249:116841. doi: 10.1016/j.carbpol.2020.116841. Epub 2020 Aug 6.
Hydrogels based on the polysaccharide ulvan from the green macroalgae Ulva fenestrata were synthesized and evaluated as an adsorbent for heavy metals ions and methylene blue. Ulvan was extracted from Ulva fenestrata using diluted hydrochloric acid and recovered by precipitation with EtOH. The extracted ulvan was converted into ulvan dialdehyde via periodate-oxidation and subsequently combined with gelatin yielding hydrogels. The hydrogels showed good water-uptake capacity with a maximum swelling degree of 2400 % in water and 900 % in PBS buffer. Adsorption tests of methylene blue showed a maximum adsorption capacity of 465 mg/g. The adsorption data of methylene blue followed the pseudo-second order kinetics and agreed with the Langmuir adsorption isotherm. The maximum adsorption capacity of heavy metal ions was 14 mg/g for Cu, 7 mg/g for Coand 6 mg/g for Niand Zn indicating that the hydrogels have a stronger affinity for Cu than for Co, Ni, and Zn.
基于绿藻石莼（Ulva fenestrata）多糖岩藻聚糖的水凝胶被合成并评估为重金属离子和亚甲基蓝的吸附剂。使用稀盐酸从石莼中提取岩藻聚糖，并用 EtOH 沉淀回收。提取的岩藻聚糖通过高碘酸盐氧化转化为岩藻聚糖醛，然后与明胶结合生成水凝胶。水凝胶具有良好的吸水性，在水中的最大溶胀度为 2400%，在 PBS 缓冲液中的最大溶胀度为 900%。亚甲基蓝的吸附实验表明，最大吸附容量为 465mg/g。亚甲基蓝的吸附数据符合准二级动力学和朗缪尔吸附等温线。对于 Cu、Co、Ni 和 Zn，重金属离子的最大吸附容量分别为 14mg/g、7mg/g、6mg/g 和 6mg/g，表明水凝胶对 Cu 的亲和力强于 Co、Ni 和 Zn。
