吸附
化学
吸附剂
动力学
尿素
无机化学
核化学
吸附
水溶液中的金属离子
傅里叶变换红外光谱
金属
化学工程
有机化学
量子力学
物理
工程类
作者
Asmaa Benettayeb,Eric Guibal,Amine Morsli,Rachid Kessas
标识
DOI:10.1016/j.cej.2017.01.131
摘要
The grafting of urea and biuret on alginate backbone (confirmed by FTIR spectrometry analysis) increases by 53–84% the sorption efficiency of the biopolymer for Cd(II), Cu(II) and Pb(II) recovery from mild acidic solutions (i.e., pH in the range 4.5–5.5). Sorption isotherms are successfully described by the Langmuir and the Sips equations: maximum sorption capacities reach up to 3.7 mmol Cd g−1, 4.7 mmol Cu g−1 and 4.8 mmol Pb g−1 for alginate-urea beads. The affinity of the sorbent for metal ions is correlated to the electronic properties (softness) and configuration of hydrated ions and to the HSAB properties (Hard and Soft Acid-Bases rules) of the ligands present on the sorbent. The diffusion properties are playing a significant role in the control of the uptake kinetic profiles; however, the pseudo-second order rate equation also allows a good fit of experimental sorption kinetics. In multi-component solutions the sorbents maintain a higher affinity for Pb(II) over the other two divalent cations.
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