{"title":"Study on influence of pore structure on photocatalytic performance of nano-TiO2 cement paste","authors":"Xueli Nan, Jiang Fan, Jianrui Ji, Shuo Wang, Mengge Zhu, Weibin Tang","doi":"10.1007/s11051-025-06320-3","DOIUrl":null,"url":null,"abstract":"<div><p>The pore structure characteristics of nano-TiO<sub>2</sub> cement paste are critical in determining its photocatalytic efficiency. In this study, the composition of the cement paste was modified to optimize the pore structure and examine its effect on photocatalytic performance. Mercury intrusion porosimetry (MIP) was utilized to characterize the pore structure of nano-TiO<sub>2</sub> cement paste, revealing that material composition significantly influences the pore structure. Photocatalytic degradation tests using methylene blue (MB) demonstrated that degradation efficiency improved with an increased water-to-binder ratio (<i>W</i>/<i>B</i>) and higher dosages of fly ash (FA) and air-entraining agent (AEA). The presence of transitional pores (10–50 nm) and capillary pores (50–1000 nm), as well as increased porosity and total pore volume, enhanced photocatalytic efficiency, while the pore surface fractal dimension showed minimal impact. Kinetic modeling and scanning electron microscopy (SEM) analyses confirmed that MB degradation by nano-TiO<sub>2</sub> cement paste follows a first-order kinetic model. Additionally, in the paste containing 0.012% AEA, the C-S–H gel exhibited a looser, network-like morphology, significantly improving photocatalytic activity.</p></div>","PeriodicalId":653,"journal":{"name":"Journal of Nanoparticle Research","volume":"27 5","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Nanoparticle Research","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s11051-025-06320-3","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The pore structure characteristics of nano-TiO2 cement paste are critical in determining its photocatalytic efficiency. In this study, the composition of the cement paste was modified to optimize the pore structure and examine its effect on photocatalytic performance. Mercury intrusion porosimetry (MIP) was utilized to characterize the pore structure of nano-TiO2 cement paste, revealing that material composition significantly influences the pore structure. Photocatalytic degradation tests using methylene blue (MB) demonstrated that degradation efficiency improved with an increased water-to-binder ratio (W/B) and higher dosages of fly ash (FA) and air-entraining agent (AEA). The presence of transitional pores (10–50 nm) and capillary pores (50–1000 nm), as well as increased porosity and total pore volume, enhanced photocatalytic efficiency, while the pore surface fractal dimension showed minimal impact. Kinetic modeling and scanning electron microscopy (SEM) analyses confirmed that MB degradation by nano-TiO2 cement paste follows a first-order kinetic model. Additionally, in the paste containing 0.012% AEA, the C-S–H gel exhibited a looser, network-like morphology, significantly improving photocatalytic activity.
期刊介绍：
The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size.
Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology.
The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.
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