El-Sayed Ashraf A
Analytical Chemistry Department, Hot Labs Center, Egyptian Atomic Energy Authority, Cairo, 13759, Egypt.
Sci Rep. 2024 Jun 6;14(1):13017. doi: 10.1038/s41598-024-62941-z.
Speciation of vanadium elements in the presence of δ-alumina in aqueous media was studied to simulate the environmental impact of soil/sediment-water interacted system. Factors affecting this process are pH, presence of humic acid, and δ-alumina concentrations as an abundant sediment/soil components. Different species of both vanadium and surface of δ-alumina were deduced theoretically using MintaqA2 programme. Due to the effect of pH, the anionic species of vanadium at pH 1-3 is prevailed and changed to cationic species at pH range 6-10 at different levels of alumina. Additionally, based on the effect of alumina concertation, high percent uptake, almost 100% was found at 10.0 g/1 concentration of alumina while at level of 0.2 g/1 alumina, the maximum adsorption of vanadium was become 91%. The effect of humic acid on the speciation behavior of vanadium (V) was also studied and compared with that of vanadium (IV) based on XANES (X-ray absorption near edge structure). Adsorption behaviors were studied at concentration 4.71E-4M for vanadium at 0.1M ionic strength. The mechanism of vanadium adsorption in the presence of alumina under the same working conditions was studied and explained based on TLM (Triple layer model) where the results proved good validation and verification of the practically produced data.
研究了在水介质中δ-氧化铝存在下钒元素的形态，以模拟土壤/沉积物-水相互作用系统的环境影响。影响该过程的因素包括pH值、腐殖酸的存在以及作为丰富沉积物/土壤成分的δ-氧化铝浓度。使用MintaqA2程序从理论上推导了钒的不同形态以及δ-氧化铝表面的情况。由于pH值的影响，在不同氧化铝水平下，pH值为1-3时钒的阴离子形态占主导，在pH值为6-10时变为阳离子形态。此外，基于氧化铝浓度的影响，在氧化铝浓度为10.0 g/1时发现钒的摄取率很高，几乎达到100%，而在氧化铝浓度为0.2 g/1时，钒的最大吸附率为91%。还基于X射线吸收近边结构（XANES）研究了腐殖酸对钒（V）形态行为的影响，并与钒（IV）进行了比较。在离子强度为0.1M时，研究了钒浓度为4.71E-4M时的吸附行为。基于三层模型（TLM）研究并解释了在相同工作条件下氧化铝存在时钒的吸附机理，结果证明了实际产生的数据具有良好的验证性。
