Obtaining Porous Zinc Oxide Ceramics Using Replica Technique: Application in Photocatalysis

Faria, Felipe P.; Ruellas, Thamara Machado de Oliveira; Roveri, Carolina Del; Malafatti, João Otávio Donizette; Paris, E. C.; Giraldi, Tania R.; Maestrelli, Sylma Carvalho

doi:10.1590/1980-5373-mr-2021-0083

Cited by 2 publications

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“…A conformation of powders eventually leads to a reduced surface area, which is disadvantageous given that these materials are regarded as pellets. Therefore, alternatives are sought to produce porous materials, such as the incorporation of organic compounds inside ceramic materials [19][20][21] . This method consists basically in dispersing organic compounds within an oxide through the preparation of a homogeneous biphasic mixture in such a way that, during the process of heat treatment, such compounds are eliminated, thus leaving a group of pores.…”

Section: Introductionmentioning

confidence: 99%

Nb2O5 Pellets with Inactive Biomass for Adsorption of Mn2+ Ions: Kinetic, Isothermal and Reuse Study

et al. 2023

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This paper aims to explore the production of porous Nb 2 O 5 pellets by pressing and adding anaerobic biomass (sludge) in order to evaluate the microstructure porosity. The thermal treatment temperature of the pellets varied between 300 ºC and 900 ºC. Their structural, morphological, and physical properties were measured, and the adsorption potential of Mn 2+ and their reuse were evaluated. All samples had a monoclinic phase. Density average values of samples pressed using sludge ranged between 2.45 and 2.52 g.cm -3 , while the one obtained without sludge pressing achieved higher values of around 2.72 g.cm -3 . All samples presented high porosity values after the heat treatment (above 40%), which confirms the efficiency of sludge as a means to enhance porosity. These pellets were used for Mn 2+ ions adsorption in aqueous medium. The Langmuir isotherm model was the one that achieved the best goodness-of-fit. In kinetic studies, the adsorption reaction was in accordance with second-order kinetics. Adsorbents in the form of pellets are environmentally friendly on account of their significant reuse and recycling potential. However, the particulate matter might become an environmental liability and incur high treatment costs. The samples proved to be reusable, promoting the adsorption of 67% of the Mn 2+ after the fifth reuse cycle.

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Section: Introductionmentioning

confidence: 99%

Nb2O5 Pellets with Inactive Biomass for Adsorption of Mn2+ Ions: Kinetic, Isothermal and Reuse Study

et al. 2023

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Fractal Analysis of Porous Alumina and Its Relationships with the Pore Structure and Mechanical Properties

2022

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Porous alumina was prepared by the sacrificial template approach using 30 vol.%, 50 vol.%, and 70 vol.% of carbon fibers and graphite as pore formers. In order to determine the pore size distribution, porosity, most probable pore size, and median pore size, a mercury intrusion porosimeter (MIP) was used. The surface fractal dimensions (Ds) of porous alumina with various pore formers were assessed based on MIP data. The findings revealed that the pore size distribution of the prepared porous alumina was either bimodal or trimodal at 50 vol.% of the pore formers, and unimodal at 30 vol.% and 70 vol.% of the pore formers in the raw materials. The porous alumina’s pore structure and morphology varied depending on the volume content of the pore formers and their shapes. The porosity and pore size of the porous alumina increased with the increase in carbon fiber content because the carbon fiber was unfavorable to the densification of the initial billet before sintering. After sintering, there were no residual pore formers other than alumina in the samples. The pore structure of the porous alumina samples showed prominent fractal characteristics, and its DS decreased with the increase in the pore former content. The samples’ Ds was highly negatively correlated with the pore structure parameters, and was positively correlated with the flexural strength.

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Obtaining Porous Zinc Oxide Ceramics Using Replica Technique: Application in Photocatalysis

Cited by 2 publications

References 39 publications

Nb2O5 Pellets with Inactive Biomass for Adsorption of Mn2+ Ions: Kinetic, Isothermal and Reuse Study

Nb2O5 Pellets with Inactive Biomass for Adsorption of Mn2+ Ions: Kinetic, Isothermal and Reuse Study

Fractal Analysis of Porous Alumina and Its Relationships with the Pore Structure and Mechanical Properties

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