College of Chemical Engineering, Jiangsu Key Lab for the Chemistry & Utilization of Agricultural and Forest Biomass, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
Jiangsu Provincial Key Laboratory of Palygorskite Science and Applied Technology, Huaiyin Institute of Technology, Huai'an 223003, China.
J Colloid Interface Sci. 2018 Mar 15;514:190-198. doi: 10.1016/j.jcis.2017.12.035. Epub 2017 Dec 13.
Floatable and porous foam adsorbents constructed by encapsulating attapulgite (ATP) in sodium alginate (SA) were fabricated via a freeze-drying and post cross-linking method, and both attapulgite and sodium alginate possessed adsorptive sites. These adsorbents were characterized by XRD, FTIR, and SEM to investigate their crystal structures, surface properties, size and morphology. In the adsorption tests, the adsorption capacity was derived from the Langmuir isotherm model, and the maximal adsorption capacity of as-prepared adsorbents was 119.0 mg g for Cu(II) and 160.0 mg g for Cd(II). In addition to the remarkable adsorptive performances, these adsorbents presented strong chemical stability and were readily recyclable because of their floatability in water solution. These aforementioned advantages highlight that the alginate-encapsulated attapulgite foams are potential scalable adsorbents for heavy metal ions removal from polluted water, and such a structure design could intrigue the development of novel adsorptive materials.
通过冷冻干燥和后交联方法制备了用海藻酸钠（SA）包埋凹凸棒石（ATP）的可浮多孔泡沫吸附剂，凹凸棒石和海藻酸钠都具有吸附位。通过 XRD、FTIR 和 SEM 对这些吸附剂进行了表征，以研究其晶体结构、表面性质、尺寸和形态。在吸附实验中，吸附容量来自朗缪尔等温模型，制备的吸附剂对 Cu(II)的最大吸附容量为 119.0 mg/g，对 Cd(II)的最大吸附容量为 160.0 mg/g。除了显著的吸附性能外，由于其在水溶液中的可浮性，这些吸附剂还表现出很强的化学稳定性，并且易于回收利用。这些优点突出表明，海藻酸钠包埋凹凸棒石泡沫是一种潜在的可用于从受污染水中去除重金属离子的规模化吸附剂，这种结构设计可能激发新型吸附材料的发展。
