吸附
水溶液
X射线光电子能谱
席夫碱
朗缪尔吸附模型
化学
水溶液中的金属离子
硫脲
单层
无机化学
树枝状大分子
金属
朗缪尔
核化学
材料科学
高分子化学
物理化学
化学工程
有机化学
工程类
生物化学
作者
Liping Luan,Bentian Tang,Shenggui Ma,Lixiang Sun,Wenlong Xu,Aili Wang,Yuzhong Niu
标识
DOI:10.1016/j.molliq.2021.115634
摘要
Schiff base modified PAMAM dendrimer/silica hybrid materials (SG-G0-SA, SG-G1.0-SA, and SG-G2.0-SA) were synthesized and used for removing aqueous Zn(II) and Ni(II). The influence of solution pH, time, temperature, and the concentration of metal ion on the removal effect were investigated. The regeneration of the adsorbents was evaluated. The interaction mechanism between adsorbents and metal ions was revealed by density functional theory (DFT) calculation and X-ray photoelectron spectroscopy (XPS) analysis. Results show the as-prepared adsorbents display comparable adsorption property for Zn(II) and Ni(II). The optimum solution pH for Zn(II) and Ni(II) removal are 6.0 and 5.0. The adsorption kinetic follows pseudo-second-order (PSO) model, while the adsorption isotherm obeys Langmuir model. The adsorption was carried out with monolayer adsorption in chemical mechanism. 0.5 mol·L−1 HNO3–5% thiourea solution can be used as efficient eluent to regenerate the adsorbents that upload metal ions. Adsorption mechanism indicates the imino N atoms and carbonyl O atoms that play the main role in the adsorption process.
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