Synergistic role of pillared bentonite with single and binary Fe/Al-polyoxocations on Pb(II) adsorption recovery from hard water under competitive and non-competitive effects

IF 5.3 2区 地球科学 Q2 CHEMISTRY, PHYSICAL
Samira M. Abdel-Azim , Noha A.K. Aboul-Gheit , Sherif A. Younis , Sahar M. Ahmed
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引用次数: 0

Abstract

This study investigates the post-pillarization of bentonite clay using Fe/Al-polyoxocations—both singular and mixed—to enhance its surface and textural properties for improved adsorption-desorption recovery of Pb(II) ions from hard water. The adsorption-desorption capabilities of the pillared bentonites (referred to as Fe-, Al-, and Fe/Al-PILBCs) are investigated and optimized, taking into account the interactions between water components and operational conditions in both competitive and non-competitive scenarios. The incorporation of mixed Fe/Al pillars significantly increases the surface area, reactivity, and interlayer spacing of the clay, leading to improved pore diffusivity and enhanced interactions between Pb(II) and the Brönsted/Lewis acid sites in Fe/Al-PILBC. Consequently, the adsorption capability of Fe/Al-PILBC for Pb(II) ions is enhanced by 1.33 to 1.53 times compared to single-pillared clay adsorbents. Optimization using response surface methodology demonstrates that the interaction between solution pH and other operational factors is crucial for maximizing the Pb(II) adsorption capacity of Fe/Al-PILBC. This capacity can reach 67.85 mg/g at a pH of 4.5 after 10 min by adjusting the Pb(II) speciation and the surface charge density of Fe/Al-PILBC.Thermodynamic, kinetic, and isotherm studies indicate that the physisorption of Pb(II) onto Fe/Al-PILBC is facilitated by heat energy input (Ea = 21.22 kJ/mol and ΔHο = 20.32 kJ/mol), allowing for endothermic adsorption with sustained adsorption-desorption recovery of Pb over 10 cycles. In practical applications involving groundwater and petroleum wastewater, higher ionic strength enhances electrostatic interactions and ion exchange between Ca(II)/Mg(II) cations and the active sites of Fe/Al-PILBC, leading to changes in Pb(II) adsorption thermodynamics due to competitive effects at the solid/liquid interface. Nonetheless, the overall adsorption capacity of Fe/Al-PILBC for divalent metal cations increases by 2.9 times in hard water compared to single Pb adsorption in a non-competitive environment, underscoring the promising potential of Fe/Al-PILBCs for water-softening applications.
柱状膨润土在竞争和非竞争条件下对硬水中Pb(II)吸附回收的协同作用
本研究研究了使用铁/铝多氧化(单一和混合)对膨润土进行柱化处理,以提高其表面和结构性能,从而提高对硬水中Pb(II)离子的吸附-解吸回收率。考虑到水组分之间的相互作用以及竞争和非竞争两种情况下的操作条件,研究并优化了柱状膨润土(称为Fe-、Al-和Fe/Al- pilbc)的吸附-解吸能力。混合Fe/Al柱的掺入显著增加了粘土的表面积、反应性和层间间距,从而改善了Fe/Al- pilbc中Pb(II)和Brönsted/Lewis酸位点之间的相互作用。结果表明,Fe/Al-PILBC对Pb(II)离子的吸附能力是单柱粘土吸附剂的1.33 ~ 1.53倍。响应面优化表明,溶液pH和其他操作因素之间的相互作用对于最大限度地提高Fe/Al-PILBC对Pb(II)的吸附能力至关重要。通过调节Pb(II)形态和Fe/Al-PILBC的表面电荷密度,在pH为4.5的条件下,经过10 min后可达到67.85 mg/g。热力学、动力学和等温线研究表明,Pb(II)在Fe/Al-PILBC上的物理吸附是由热量输入(Ea = 21.22 kJ/mol和ΔHο = 20.32 kJ/mol)促进的,允许吸热吸附,并在10个循环内持续吸附-解吸回收Pb。在地下水和石油废水的实际应用中,较高的离子强度增强了Ca(II)/Mg(II)阳离子与Fe/Al-PILBC活性位点之间的静电相互作用和离子交换,导致固体/液体界面上的竞争效应导致Pb(II)吸附热力学的变化。尽管如此,Fe/Al-PILBC在硬水中对二价金属阳离子的总体吸附能力比在非竞争环境中对单Pb的吸附能力提高了2.9倍,这表明Fe/Al-PILBC在水软化应用中具有广阔的潜力。
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来源期刊
Applied Clay Science
Applied Clay Science 地学-矿物学
CiteScore
10.30
自引率
10.70%
发文量
289
审稿时长
39 days
期刊介绍: Applied Clay Science aims to be an international journal attracting high quality scientific papers on clays and clay minerals, including research papers, reviews, and technical notes. The journal covers typical subjects of Fundamental and Applied Clay Science such as: • Synthesis and purification • Structural, crystallographic and mineralogical properties of clays and clay minerals • Thermal properties of clays and clay minerals • Physico-chemical properties including i) surface and interface properties; ii) thermodynamic properties; iii) mechanical properties • Interaction with water, with polar and apolar molecules • Colloidal properties and rheology • Adsorption, Intercalation, Ionic exchange • Genesis and deposits of clay minerals • Geology and geochemistry of clays • Modification of clays and clay minerals properties by thermal and physical treatments • Modification by chemical treatments with organic and inorganic molecules(organoclays, pillared clays) • Modification by biological microorganisms. etc...
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