Preparation, Characterization, and Photocatalytic Properties of Modified Red Mud

Ma, Mingjie; Wang, Guanyu; Yang, Zhengpeng; Huang, Shanxiu; Guo, Weijie; Shen, Yuxia

doi:10.1155/2015/907539

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…ere is an estimated 3 billion tons of accumulated RM globally, with the worldwide generation of RM exceeding 117 million tons per year in recent years [8,9]. e discharge of RM seriously impacts the environment and groundwater because of its high alkaline content (Na 2 O 2.0-6.0%) [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Zhang

Mao

et al. 2019

Advances in Materials Science and Engineering

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Serious environmental pollution issues caused by the storage and exposure of large amounts of red mud (RM) and yellow phosphorus slag (YPS) have raised significant concerns. Red mud-yellow phosphorous slag-cement concrete (RM-YPS-CC) is prepared with 25% yellow phosphorus slag content (YPSC) and 10% red mud content (RMC) to replace a portion of the cement at the age of 28 days and was found in this study to satisfy the mechanical property requirements. More ettringite and portlandite were generated with the RM-YPS-CC than with the yellow phosphorous slag-cement concrete (YPS-CC). In addition, the cementitious materials were more interlaced, and there was more disorder in the crystals of the RM-YPS-CC, which formed a more complex spatial structure than the YPS-CC did. Without RM, the initial cracking strength on the surface of the concrete was 5–6 MPa, the maximum crack width was 3.96 mm, and the crack number was 8. However, the cracking strength was 26.5–27 MPa with RMC5, the maximum crack width was 0.66 mm with RMC15, and the crack number was 3 with RMC15. Moreover, studies using the digital image correlation (DIC) method indicated that the displacement distribution and evolution of the first crack area changed quickly at 10 MPa in either horizontal or vertical direction, and a similar trend was maintained from 10 MPa to 27.1 MPa for the YPS-CC. However, with a small distribution and evolution of horizontal or vertical displacement from 5 MPa to 25 MPa, the evolution would change rapidly when reaching 30 MPa for RM-YPS-CC. This study aims to provide new insights into the wide application of YPS and RM for saving energy and reducing emissions and to develop a new method to study the fracture behavior of concrete.

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Section: Introductionmentioning

confidence: 99%

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Zhang

Mao

et al. 2019

Advances in Materials Science and Engineering

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“…Both RM and FA may display photocatalytic properties for the degradation of varying dyes. Especially due to the photoactive oxides like TiO 2 , Fe 2 O 3 , etc., that are present in these wastes may trigger a photocatalytic activity 35,37,44,70,71 . In the present study, although these oxides were trapped in a partially molten phase, the surface area which encountered both the dye and UV light was increased by increasing open porosity.…”

Section: Resultsmentioning

confidence: 53%

“…RM and FA are cost‐effective and abundant substrates, making them attractive options for sustainable photocatalytic solutions with potential chemical and thermal treatments to optimize their properties. These substrates function through a combination of physical and chemical adsorption mechanisms, efficiently decomposing pollutants via photocatalytic decomposition 35–43 …”

Section: Introductionmentioning

confidence: 99%

“…These substrates function through a combination of physical and chemical adsorption mechanisms, efficiently decomposing pollutants via photocatalytic decomposition. [35][36][37][38][39][40][41][42][43] RM and FA can be transformed into photocatalysts through alkali activation, which initiates chemical reactions with alkaline solutions. On the other hand, ceramicization at high temperatures produces ceramics with a stable crystalline structure, low permeability, and the ability to prevent the ingress of pollutants, allowing their breakdown through photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Özcan,

Birol,

Dülger Kutlu

et al. 2023

Int J Applied Ceramic Tech

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In order to improve filtering efficacy, nanoparticles are often deposited as photocatalytic degrading agents onto porous ceramics. This study aimed to deposit ZnO nanoparticles on ceramic substrates produced from fly ash and red mud with adjustable porosity and investigate their photocatalytic properties. To achieve this goal, at first porous ceramics were produced and sintered at various temperature/time intervals. It was observed that sintering at 800°C for 120 min provided a proper structure and porosity. In addition, MgO replacement with MgCO3 lowered the water absorption of the samples from 25.63% to 11.45%. The samples were then coated with ZnO nanoparticles using the sol–gel method and the ZnO structures obtained were micron‐sized plates. It was observed that increasing porosity increased the ZnO amount and accordingly the photocatalytic properties of the products. During the adsorption tests conducted in the dark, the coated ceramic samples were stained with MB with a maximum MB adsorption ratio of ∼14%. On the other hand, no visible MB stain was observed on the samples that were exposed to UV irradiation, and the MB removal after the UV irradiation was 93.6%; therefore, it was concluded that the dominant MB removal mechanism was photocatalytic.

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Microstructural Characterization of Red Mud as Affected by Inorganic and Organic Chemicals Permeation

Rubinos

Valcárcel

Spagnoli³

et al. 2017

JOM

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Preparation, Characterization, and Photocatalytic Properties of Modified Red Mud

Cited by 10 publications

References 16 publications

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Study on the Preparation and Fracture Behavior of Red Mud-Yellow Phosphorus Slag-Based Concrete

Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Microstructural Characterization of Red Mud as Affected by Inorganic and Organic Chemicals Permeation

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