吸附
钯
吸热过程
解吸
化学
傅里叶变换红外光谱
零电荷点
水溶液
红外光谱学
无机化学
分析化学(期刊)
物理化学
化学工程
有机化学
催化作用
工程类
作者
Mihaela Ciopec,Oana Grad,Adina Negrea,Narcis Duţeanu,Petru Negrea,Cristina Paul,Cătălin Ianăși,Giannin Moșoarcă,Cosmin Vancea
标识
DOI:10.3390/ijms221910718
摘要
The study of new useful, efficient and selective structures for the palladium ions' recovery has led to the development of a new series of macromolecules. Thus, this study presents a comparative behavior of two crown benzene ethers that modify the magnesium silicate surface used as adsorbent for palladium. These crown ethers are dibenzo18-crown-6 (DB18C6) and dibenzo 30-crown-10 (DB30C10). The obtained materials were characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX) and Fourier-transform infrared spectroscopy (FT-IR). The specific surface area (BET) and point of zero charge (PZC) of the two materials were determined. The palladium ions' recovery from synthetic aqueous solutions studies aimed to establish the adsorption mechanism. For this desideratum, the kinetic, equilibrium and thermodynamic studies show that MgSiO3-DB30C10 have a higher adsorption capacity (35.68 mg g-1) compared to MgSiO3-DB18C6 (21.65 mg g-1). Thermodynamic studies highlight that the adsorption of Pd(II) on the two studied materials are spontaneous and endothermic processes. The positive values of the entropy (ΔS0) suggest that the studied adsorption processes show a higher disorder at the liquid/solid interface. Desorption studies were also performed, and it was found that the degree of desorption was 98.3%.
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