Use of modified bauxite residue-based porous inorganic polymer monoliths as adsorbents of methylene blue

Hertel, Tobias; Novais, Rui M.; Alarcón, Roberto Murillo; Labrincha, J.A.; Pontikes, Yiannis

doi:10.1016/j.jclepro.2019.04.084

Cited by 58 publications

(19 citation statements)

References 58 publications

(76 reference statements)

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“… 20 , 21 The introduction of large open pores (μm scale) to the geopolymer structure widens their prospects in adsorption applications 9 because of the increased water permeability and available surface area. Consequently, these porous spheres 22 , 23 and monoliths 24 , 25 can be used instead of powders as adsorption media, which simplifies the separation of adsorbent and regeneration.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Selkälä

Suopajärvi

Sirviö

et al. 2020

ACS Appl. Mater. Interfaces

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In this work, a surface cationized inorganic–organic hybrid foam was produced from porous geopolymer (GP) and cellulose nanocrystals (CNCs). GPs were synthesized from alkali-activated metakaolin using H 2 O 2 as a blowing agent and hexadecyltrimethylammonium bromide (CTAB) as a surfactant. These highly porous GPs were combined at pH 7.5 with cationic CNCs that had been synthesized from dissolving pulp through periodate oxidation followed by cationization in a deep eutectic solvent. The GP-CNC hybrid foams were employed as reactive filters in the removal of the anionic dye, methyl orange (MO; 5–10 mg/L, pH 7). The effects of a mild acid wash and thermal treatments on the structure, properties, and adsorption capacity of the GPs with CNCs and MO were investigated. The CNCs aligned as films and filaments on the surfaces of the neutralized GPs and the addition of CNCs improved MO removal by up to 84% compared with the reference sample. In addition, CTAB was found to disrupt the attachment of CNCs on the pores and improve adsorption of MO in the GPs with and without CNCs.

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Section: Introductionmentioning

confidence: 99%

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Selkälä

Suopajärvi

Sirviö

et al. 2020

ACS Appl. Mater. Interfaces

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“…Despite the chemical differences between GPs and IPs, these materials are reported to have excellent mechanical strength properties [3], high chemical resistance (acidic or sulfate environments) [4,5], and considerable resistance to high-temperatures [4,5]. Apart from applications in the construction sector, GPs and IPs had shown promising potential in a vast group of novel applications that include, among others, wastewater decontamination [6], pH regulation [7], membrane and membrane supports [8,9], catalysts, catalyst supports and scaffolds [10], high-temperature processes and acoustic insulation [11], radioactive waste management [12], and space construction [13].…”

Section: Introductionmentioning

confidence: 99%

Shrinkage and Mitigation Strategies to Improve the Dimensional Stability of CaO-FeOx-Al2O3-SiO2 Inorganic Polymers

et al. 2019

Self Cite

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Volumetric stability is an important aspect of the performance of building materials, and the shrinkage of CaO-FeOx-Al2O3-SiO2-rich inorganic polymers (IPs) has not been thoroughly investigated yet. Hence, this paper describes the outcome of a study conducted to investigate ways to minimize their shrinkage using different curing regimes. Two different slags were used as case studies to assess the robustness of the developed mitigation strategies. IP pastes and mortars were cured at (i) room condition, (ii) in slightly elevated temperature (60 °C for 2 d) and (iii) in a water-saturated environment. The reaction kinetics and formed products were examined on IP pastes, while mortars were made to characterize the 28 d pore structure, autogenous shrinkage, drying shrinkage, and strength development. The results showed that the precursors’ reactivity and curing conditions severely affect shrinkage mechanisms and magnitude. Volumetric changes in the plastic stage can be related to the precursors’ reactivity but drying shrinkage was the driving mechanism affecting the volumetric stability of all IP mortars. Understanding the effect of a precursor’s composition and curing conditions on shrinkage is fundamental to develop proper mitigation strategies and to overcome one of IPs’ main technical drawbacks.

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“…The authors claim that the presence of aluminium and iron in the activated carbon matrix is responsible for the increase in pore volume and absorption capacity. This point of view is also shared by Hertel et al [14] show that, with an increase amount of aluminum and L/S ratio, more H 2 is generate which leads to an increase porosity of bauxite residue-based porous inorganic polymer. This study focuses on the evaluation of the physical and mechanical properties of porous inorganic polymers obtained by partial replacement of VA by powder of ABCs from the Cameroonian brewing industries by the sol-gel method.…”

Section: Introductionmentioning

confidence: 55%

“…It is important to note that, the aluminum beverage cans from the brewing product production units are essentially made of aluminum (around 97.5%) [9] and therefore, the waste obtained after use can be used as a blowing agent during the development of porous inorganic polymers. Indeed, several studies have shown that the use of an additional source of silicon or aluminum during the synthesis of inorganic polymers promotes the formation of pores within the synthetic products obtained [10][11][12][13][14]. For example Hamed et al [13] show that the use of inoganic polymers rich in Al and Fe during the synthesis of sesame-based activated carbons leads to a modification of the structural properties and morphology of the materials.…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of a Porous Material Obtained by Low Replacement of Volcanic Ash by Aluminum Beverage Cans

Dickson¹,

Noussi

Ebongue

et al. 2021

AIR

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This study focuses on the evaluation of the physical and mechanical properties of a porous material based on a mixture of powder (Volcanic ash /Aluminum Beverage Cans) and a solution of phosphoric acid. Volcanic ash (VA) use was collected in one of the quarries of Mandjo (Cameroon coastal region), crushed, then characterized by XRF, DRX, FTIR and named MaJ. The various polymers obtained are called MaJ0, MaJ2.5, MaJ5, MaJ7.5 and MaJ10 according to the mass content of the additions of the powder from the aluminum beverage cans (ABCs). The physical and mechanical properties of the synthetic products were evaluated by determining the apparent porosity, bulk density, water absorption and compressive strength. The results of this study show that the partial replacement of the powder of VA by that of ABC leads to a reduction in the compressive strength (5.9 - 0.8 MPa) and bulk density (2.56 – 1.32 g/cm3) of the polymers obtained. On the other hand, apparent porosity, water absorption and pore formation within the polymers increases with addition of the powder from the beverage cans. All of these results allow us to agree that the ABCs powder can be used as a blowing agent during the synthesis of phosphate inorganic polymers.

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Use of modified bauxite residue-based porous inorganic polymer monoliths as adsorbents of methylene blue

Cited by 58 publications

References 58 publications

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Surface Modification of Cured Inorganic Foams with Cationic Cellulose Nanocrystals and Their Use as Reactive Filter Media for Anionic Dye Removal

Shrinkage and Mitigation Strategies to Improve the Dimensional Stability of CaO-FeOx-Al2O3-SiO2 Inorganic Polymers

Physical and Mechanical Properties of a Porous Material Obtained by Low Replacement of Volcanic Ash by Aluminum Beverage Cans

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