Provincial Experimental Teaching Demonstration Center of Environmental Engineering, Department of Environmental and chemical Engineering, Tangshan University, Tangshan, People's Republic of China.
Research Center of Mine Ecological Restoration Engineering, School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, People's Republic of China.
Environ Sci Pollut Res Int. 2021 Jul;28(26):34584-34597. doi: 10.1007/s11356-021-12681-8. Epub 2021 Mar 2.
Preferential removal of phosphate from aqueous was conducted by a novel biomass-based nanocomposite (EP-N-Zr) with encapsulated hydrous zirconium oxide, and the biopolymer EP-N-Zr features were described. EP-N-Zr exhibited high selective sequestration toward phosphate when humic acid or other competing anions (Cl, SO, NO, ClO) coexisted at relatively high levels. Such excellent performance of EP-N-Zr was attributed to its specific two site structures; the embedded HZO nanoparticles and quaternary ammonia groups [N(CHCH)Cl] bonded inside the biomass-Enteromorpha prolifera, which facilitated preferable capture towards phosphate through specific affinity and nonspecific preconcentration of phosphate ions on the basis of the ion exchange, respectively. The maximum adsorption capacity of phosphate (20 °C) as calculated by Langmuir model was 88.5 mg(P)/g. Regeneration tests showed that EP-N-Zr could be recycled at least five times without noticeable capacity losses using binary NaOH-NaCl as eluent.
采用新型生物质基纳米复合材料（EP-N-Zr），其中封装了水合氧化锆，对水溶液中的磷酸盐进行优先去除，描述了生物聚合物 EP-N-Zr 的特性。当腐殖酸或其他竞争阴离子（Cl、SO、NO、ClO）共存于相对较高水平时，EP-N-Zr 对磷酸盐表现出高选择性螯合。EP-N-Zr 的这种优异性能归因于其特殊的双位结构；嵌入的 HZO 纳米颗粒和季铵基团[N(CHCH)Cl]键合在生物质-浒苔内部，这有利于通过离子交换分别通过磷酸盐离子的特异性亲和力和非特异性预浓缩来更好地捕获磷酸盐。根据朗缪尔模型计算的磷酸盐最大吸附容量（20°C）为 88.5mg(P)/g。再生试验表明，使用二元 NaOH-NaCl 作为洗脱剂，EP-N-Zr 至少可以回收 5 次而不会明显损失容量。
