Zheng Dianyuan, Yao Rongbin, Sun Chengxiang, Zheng Yuhang, Liu Cheng
Institute for Clean Energy & Advanced Materials, Lianyungang Normal College, Lianyungang 222006, China.
State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, Nanjing University, Nanjing 210093, China.
ACS Omega. 2021 Feb 18;6(8):5399-5407. doi: 10.1021/acsomega.0c05489. eCollection 2021 Mar 2.
Lanthanum-based materials have attained increasing attention because of their high adsorption property of phosphate ions and their environmental harmlessness. However, challenges still remain to improve the phosphate adsorption capacity and find suitable materials for the lanthanum attachment substrate. Nickel foam with characteristics such as excellent uniformity, large specific surface area, high porosity, and low conductivity is considered to be the alternative for the preparation of lanthanum-based adsorption materials. An efficient adsorbent foamed nickel-based La (OH) nanowire was first prepared with a facile one-step electrodeposition method. The batch static adsorption tests of simulative wastewater (e.g., coexisting ions and solution pH values) were employed to investigate the phosphate adsorption kinetics and solution matrix effects of the materials. The results indicate that the composite exhibits fast adsorption kinetics within 30 min and high selectivity to phosphate under interference from competing ions. The pH value of wastewater has great influence on the absorption of phosphate, and optimal adsorption capacity can be achieved over a pH 4-6 range. Various findings revealed that the adsorption behavior of lanthanum hydroxide/foamed nickel [La(OH)/Ni] followed inner-sphere adsorption through the ligand-exchange mechanism. The prepared material is expected to be an enormous potential candidate for the removal of low-concentration phosphorus from effluents.
基于镧的材料因其对磷酸根离子的高吸附性能及其环境无害性而受到越来越多的关注。然而，提高磷酸盐吸附能力并找到适合镧附着基质的材料仍然存在挑战。具有优异均匀性、大比表面积、高孔隙率和低电导率等特性的泡沫镍被认为是制备镧基吸附材料的替代品。首次采用简便的一步电沉积法制备了一种高效吸附剂泡沫镍基La(OH)纳米线。采用模拟废水的批量静态吸附试验（如共存离子和溶液pH值）来研究材料的磷酸盐吸附动力学和溶液基质效应。结果表明，该复合材料在30分钟内表现出快速的吸附动力学，并且在竞争离子的干扰下对磷酸盐具有高选择性。废水的pH值对磷酸盐的吸收有很大影响，在pH 4-6范围内可实现最佳吸附容量。各种研究结果表明，氢氧化镧/泡沫镍[La(OH)/Ni]的吸附行为遵循通过配体交换机制的内球吸附。所制备的材料有望成为从废水中去除低浓度磷的极具潜力的候选材料。
