Al-Anber Mohammed A, Al Ja'afreh Malak, Al-Momani Idrees F, Hijazi Ahmed K, Sobola Dinara, Sagadevan Suresh, Al Bayaydah Salsabeel
Laboratory of Inorganic Materials and Polymers, Department of Chemistry, Faculty of Sciences, Mutah University, P.O. Box 7, Al-Karak 61710, Jordan.
Department of Chemistry, Faculty of Sciences, Yarmouk University, Irbid 21163, Jordan.
Gels. 2023 Oct 30;9(11):865. doi: 10.3390/gels9110865.
The L-cysteine-functionalized silica (SG-CysNa) matrix was effectively loaded with silver (I) ions using the batch sorption technique. Optimal Ag(I) loading into SG-CysNa reached 98% at H = 6, 80 rpm, 1 mg L, and a temperature of 55 °C. The Langmuir isotherm was found to be suitable for Ag(I) binding onto SG-CysNa active sites, forming a homogeneous monolayer ( = 0.999), as confirmed by FTIR spectroscopy. XRD analysis indicated matrix stability and the absence of AgO and Ag(0) phases, observed from diffraction peaks. The pseudo-second-order model ( > 0.999) suggested chemisorption-controlled adsorption, involving chemical bonding between silver ions and SG-CysNa surface. Thermodynamic parameters were calculated, indicating higher initial concentrations leading to increased equilibrium constants, negative Δ values, positive Δ values, and negative Δ. This study aimed to explore silver ion saturation on silica surfaces and the underlying association mechanisms. The capability to capture and load silver (I) ions onto functionalized silica gel materials holds promise for environmental and water purification applications.
采用分批吸附技术，将银（I）离子有效地负载到L-半胱氨酸功能化的二氧化硅（SG-CysNa）基质上。在H = 6、80 rpm、1 mg/L和55°C的温度下，SG-CysNa对Ag（I）的最佳负载量达到98%。FTIR光谱证实，Langmuir等温线适用于Ag（I）与SG-CysNa活性位点的结合，形成均匀的单层（ = 0.999）。XRD分析表明基质稳定，从衍射峰观察到不存在AgO和Ag（0）相。伪二级模型（ > 0.999）表明吸附受化学吸附控制，涉及银离子与SG-CysNa表面之间的化学键合。计算了热力学参数，表明初始浓度越高，平衡常数越大，Δ值为负，Δ值为正，Δ为负。本研究旨在探索二氧化硅表面的银离子饱和度及其潜在的缔合机制。将银（I）离子捕获并负载到功能化硅胶材料上的能力在环境和水净化应用方面具有前景。
