Insight into the Influence of the Integrated Chitosan on the Adsorption Properties of Chitosan/Al-MCM-41 Composite for As (V) Metal Ions: Characterization and Advanced Equilibrium Studies

IF 3.1 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Mostafa R. Abukhadra, F. Dardir, E. Ahmed, M. F. Soliman, S. Othman, A. Allam, Wail Al Zoubi, Mohamed S Shaban
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Abstract

Ecofriendly chitosan/Al-MCM-48 (CH/Al-MCM) was synthesized from natural microcline and assessed as a potential adsorbent of As (V) ions with enhanced capacity. The As (V) adsorption properties of CH/Al-MCM were assessed in comparison with Al-MCM-41 as a single phase. The studied CH/Al-MCM exhibits 178.6 mg/g as As (V) adsorption capacity which is higher than Al-MCM-41 (124 mg/g). The adsorption properties were illustrated based on the pseudo-first-order kinetic, Langmuir isotherm, and monolayer model with one energy site. Based on the recognized steric parameters, CH/Al-MCM displays significant enhancement in the active sites density (Nm = 88.8 mg/g (20°C)) as compared to Al-MCM (Nm = 61.5 mg/g). This signifies the role of the chitosan integration process in enhancing the adsorption capacity by increasing the availability of the present active sites. The number of adsorbed arsenic ions (2.01 to 2.66) suggests the uptake of 2 or 3 ions per free site by a multi-ionic and physical mechanism considering the adsorption energy (−16.3 to −16.9 kJ/mol). The thermodynamic functions of entropy, internal energy, and free enthalpy reflect the spontaneous and exothermic properties of the studied As (V) adsorption system by CH/Al-MCM. Moreover, the composite displays significant As (V) adsorption capacity in the existence of other dissolved ions.
集成壳聚糖对壳聚糖/Al-MCM-41复合材料吸附As (V)金属离子性能的影响:表征及高级平衡研究
以天然微斜长石为原料合成了生态友好型壳聚糖/Al-MCM-48(CH/Al-MCM),并评价了其作为as(V)离子吸附剂的潜力。通过与单相的Al-MCM-41相比较,评价了CH/Al-MCM对As(V)的吸附性能。所研究的CH/Al-MCM显示178.6 mg/g as(V)吸附容量,其高于Al-MCM-41(124 mg/g)。基于拟一阶动力学、Langmuir等温线和单能位单层模型对其吸附性能进行了说明。基于公认的空间参数,CH/Al-MCM显示出活性位点密度的显著增强(Nm = 88.8 mg/g(20°C)) = 61.5 mg/g)。这表明壳聚糖整合过程通过增加现有活性位点的可用性来增强吸附能力。吸附的砷离子数量(2.01至2.66)表明,考虑到吸附能(−16.3至−16.9),通过多离子和物理机制,每个自由位点吸收2或3个离子 kJ/mol)。熵、内能和自由焓的热力学函数反映了所研究的CH/Al-MCM吸附As(V)系统的自发和放热特性。此外,在存在其他溶解离子的情况下,该复合材料显示出显著的As(V)吸附能力。
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来源期刊
Nanomaterials and Nanotechnology
Nanomaterials and Nanotechnology NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
7.20
自引率
21.60%
发文量
13
审稿时长
15 weeks
期刊介绍: Nanomaterials and Nanotechnology is a JCR ranked, peer-reviewed open access journal addressed to a cross-disciplinary readership including scientists, researchers and professionals in both academia and industry with an interest in nanoscience and nanotechnology. The scope comprises (but is not limited to) the fundamental aspects and applications of nanoscience and nanotechnology
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