Phosphate removal from aqueous solution using ytterbium oxide supported mesoporous silicas (SBA-15, KIT-6 & MCM-41)

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-05-14 DOI:10.1016/j.micromeso.2025.113681

Mozhdeh Gholami, James Tardio

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引用次数: 0

Abstract

In this study, a series of ytterbium supported mesoporous silicas, SBA-15, KIT-6 and MCM-41 (containing different amounts of Yb) were studied for phosphate removal from aqueous solution. The prepared materials were characterized by X-ray diffraction, N2 adsorption/desorption (BET), HRTEM and XPS. All of the materials prepared were found to possess an ordered hexagonal mesoporous structure. The best performing materials under the conditions used (in terms of maximum adsorption capacity) for each of the silica supports were 0.3 Yb SBA-15, 0.1 Yb KIT-6, and 0.1 Yb MCM-41 which had maximum adsorption capacities of 20.1 mg P/g, 20.9 mg P/g and 20.5 mg P/g respectively. The aforementioned best performing materials were found to have slightly higher maximum adsorption capacities at lower pH (pH 3 and 5, compared to pH 6) whilst the coexistence of chloride, sulphate and nitrate, were found to have no significant effect on phosphate adsorption. Bicarbonate ion was found to have a significant negative effect on adsorption capacity – this however was most likely due to this ion increasing the solution pH which in turn causes reduced adsorption. It was found that adsorbed phosphate could be readily desorbed from the materials studied using HNO₃ (5 %) at room temperature. Reuse tests showed a slightly reduced adsorption capacity for the materials for which regeneration studies were conducted.

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使用氧化镱负载的介孔二氧化硅（SBA-15， KIT-6和MCM-41）去除水溶液中的磷酸盐

在本研究中，研究了一系列含镱介孔二氧化硅、SBA-15、KIT-6和MCM-41（含不同量的Yb）对水溶液中磷酸盐的去除效果。采用x射线衍射、N2吸附/脱附（BET）、HRTEM和XPS对制备的材料进行了表征。所制备的材料均具有有序的六方介孔结构。每种二氧化硅载体的最大吸附容量分别为0.3 Yb SBA-15、0.1 Yb KIT-6和0.1 Yb MCM-41，其最大吸附容量分别为20.1 mg P/g、20.9 mg P/g和20.5 mg P/g。研究发现，上述性能最好的材料在较低pH （pH 3和5，与pH 6相比）下的最大吸附容量略高，而氯化物、硫酸盐和硝酸盐的共存对磷酸盐的吸附没有显著影响。碳酸氢盐离子被发现对吸附能力有显著的负面影响——然而，这很可能是由于这种离子增加了溶液的pH值，从而导致吸附减少。结果表明，在室温下，用5%的HNO3可以很容易地将吸附的磷酸盐从所研究的材料中解吸出来。重复使用试验表明，对进行再生研究的材料的吸附能力略有降低。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.