A Time-Interval Strategy to Prepare Porous SiO2 Spheres with Adjustable Core–Shell Ratio for Multiple Guest Loading

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-09-18 DOI:10.1021/acs.langmuir.4c01863

Jiaxin Du, Su Liu, Qiangyu Xue, Qiao Xu, Jinhan Li, Wenting Shen, Yinsong Si

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Abstract

Porous microspheres with desired pore size and distribution are in high demand for loading various guest materials, especially various pollutants that are several nanometers in size or stably suspended in liquid. Herein, multilevel porous SiO₂ microspheres with arbitrarily adjustable core–shell ratios are prepared by solely regulating the time interval between the start of the hydrolysis reaction and the addition of organic solvent. The core–shell ratio of the SiO₂ microspheres increases gradually with prolongation of the addition time interval; meanwhile, the specific surface area can be adjusted from 543.2 m² g^–1 to 992.9 m² g^–1, and the average pore diameter varies from 2.3 to 5.7 nm together with a high pore volume reaching 0.91 cm³ g^–1. Moreover, the hierarchical core–shell SiO₂ microspheres with an adjustable core–shell ratio, a large specific surface area, and a multilevel pore size could be obtained on a large scale. These SiO₂ microspheres demonstrate excellent performance in coloading platinum nanoparticles and various dye molecules, suggesting their great potential in treating various pollutants in printing and dyeing wastewater.

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制备具有可调核壳比的多孔二氧化硅球的时间间隔策略，可用于多种客体负载

具有所需孔径和分布的多孔微球在装载各种客体材料，尤其是装载几纳米大小或稳定悬浮在液体中的各种污染物方面具有很高的需求。本文通过调节水解反应开始到加入有机溶剂之间的时间间隔，制备出核壳比可任意调节的多层次多孔二氧化硅微球。随着添加时间间隔的延长，SiO2 微球的核壳比逐渐增大；同时，比表面积可在 543.2 m2 g-1 至 992.9 m2 g-1 之间调节，平均孔径在 2.3 至 5.7 nm 之间变化，孔体积高达 0.91 cm3 g-1。此外，还可大规模获得核壳比可调、比表面积大、孔径多级的分层核壳二氧化硅微球。这些二氧化硅微球在负载铂纳米粒子和各种染料分子方面表现出优异的性能，表明它们在处理印染废水中的各种污染物方面具有巨大的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).