Composite Fayalite with 5% Laterite Soil and Iron Sand: Structural Properties and Band Gap Calculation Based on Theoretical Kubelka–Munk, Taylor Expansion, and Self-Consistent Field Method

Heryanto, Heryanto; Tahir, Dahlang

doi:10.1007/s11837-023-05828-0

Cited by 6 publications

(3 citation statements)

References 51 publications

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“…We also detect the Fayalite as dominant phase for nickel slag sample which has good correlation to the Refs [29,30]. Fayalite is an orthorhombic crystalline material, which consists of SiO2 with a tetrahedral structure, which is formed by a Si atom at the center coordinate and 4 O atoms binding it.…”

Section: Chemical Compounds Of Claymentioning

confidence: 57%

“…This measurement is performed using X-ray diffractometer SHIMADZU 7000 with CuK𝛼 radiation (𝜆 𝐶𝑢 = 1.54 Å) in the range (2𝜃 = 10 -70 °), operation 30 kV and 10 mA [24]. The diffraction measurement results of the test samples were then analyzed using Match and Maud software followed step from our previous study [25,26]. The principle of this application is to present the diffraction pattern based on the X-ray intensity at an angle of 2θ, which is then matched with the distribution pattern formed that have been stored in the international data base.…”

Section: Materials Characterization Testingmentioning

confidence: 99%

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Proximity Porosity and Crystallinity Analysis as Clay/Nickel Slag Characteristics for Material Stabilization Application

Gaus,

Rauf,

Siregar

et al. 2024

Trends Sci

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Slag nikel is a by-product of nickel ore smelting through the pyrometallurgical process, which contains silica (> 50 %). This suggests that nickel slag, possessing pozzolanic properties, which potentially to be used as a binding material in construction projects dealing with low soil bearing capacity, such as soil improvement for road foundation. Pozzolanic reactions are greatly influenced by the chemical bonds formed between the binding material and the soil, causing mechanical characteristic changes in the soil. This study aims to examine the effect of adding nickel slag to soft soil based on changes in its physical, mechanical and chemical properties. Physical and mechanical property tests were conducted according to ASTM standards, while the changes in chemical structure in the soil were analyzed based on X-Ray Diffraction (XRD) test results. In this study, nickel slag percentages of 3, 6, 9 and 12 % were used based on the weight ratio of clay soil, at optimum water content (wopt). Furthermore, the test specimens were cured for 14, 28 and 56 days to observe the effect of time on the increase of crystal phases in each variation. The results showed that the presence of nickel slag in the soil can affect its physical and mechanical properties. The nickel slag content in the soil of 3, 6, 9 and 12 % reduces the plasticity index by 16.69, 12.02, 8.86 and 6.38 %, respectively. Meanwhile, the density values increased by 10.97, 11.27, 11.68 and 12.01 kN/m3, respectively. The changes in physical and mechanical properties can be explained by the XRD analysis results, showing changes in the spectrum curve and peak intensity of X-Ray Diffraction in the soil with the addition of nickel slag. This explanation clarifies the transformation of the soil’s atomic structure from an amorphous state to a crystalline form, which is stabilized by nickel slag. HIGHLIGHTS The silica-rich nature of nickel slag offers a feasible alternative for chemical soil stabilisation The stabilization of soft soil with nickel slag results in a decrease in the plasticity index and an increase in density Immersion duration shows a changing response for the crystallinity index and porosity of the material GRAPHICAL ABSTRACT

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Section: Chemical Compounds Of Claymentioning

confidence: 57%

Section: Materials Characterization Testingmentioning

confidence: 99%

Proximity Porosity and Crystallinity Analysis as Clay/Nickel Slag Characteristics for Material Stabilization Application

Gaus,

Rauf,

Siregar

et al. 2024

Trends Sci

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“…The obtained absorbance was analyzed using the Tauc models to determine the optical band gap ( E g ) of the dispersed nanolayered Ti 4 N 3 T x MXene as a function of time following the approach reported by Makuła et al and Heryanto et al − To enhance the accuracy of E g value calculation using Tauc’s plots, it is important to assume that the absorption coefficient (α) is directly proportional to fundamental parameters, such as the Planck’s constant ( h ), photon frequency ( v ), and energy gap ( E g ) . The expression for the Tauc plot is given as ( α normals · h v ) 1 / γ = C ( normalh normalv − E normalg ) …”

Section: Methodsmentioning

confidence: 99%

Nanolayered Ti₄N₃T_x MXene Retains Its Electrocatalytic Properties after Prolonged Immersion in Solvents

Ngozichukwu,

Pranada,

Johnson

et al. 2024

ACS Appl. Nano Mater.

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The unique combination of high electronic conductivity, surface area, and tunability in MXenes makes them ideal electrocatalysts for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR); however, existing literature predominantly focuses on their electrocatalytic performance as opposed to their long-term electrocatalytic stability, such as how nitride MXene HER or ORR activity varies over time. A key experiment to understanding the stability is evaluating the overpotential, Tafel slope, and exchange current density of the MXene after prolonged immersion in solvents typically used for MXene storage. Herein, we investigate the electrocatalytic behavior of a nanolayered Ti4N3T x nitride MXene toward HER and ORR after a period of 230 days in various solvents, including water, ethanol, N–N dimethylformamide (DMF), dimethyl sulfoxide (DMSO), acetonitrile, and hexane. Specifically, we evaluate the overpotential, Tafel slope, and limiting current density after the 230 day period as metrics of the material stability and degradation. Remarkably, the HER activity of the nanolayered Ti4N3T x MXene remains unaltered after 230 days of immersion, with consistent overpotential and Tafel slope values, regardless of the solvent. We observe a minimal amount of TiO2 formation, as suggested by Raman spectroscopy and scanning electron microscopy imaging. However, for ORR, the overpotential, Tafel slope, and limiting current density change after the immersion time. Additionally, in all the solvents, the number of electrons transferred per molecule of product shifts from 4 to 2, indicating a mechanistic change. These findings suggest that the effect of immersion solvent on MXene electrocatalysis is correlated with the type of reaction and is likely a strong function of the terminal group. In summary, these findings can be exploited to establish MXene-solvent electrocatalytic relationships to broaden their utilization in electrocatalysis and facilitate their integration in solvent-based applications.

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Strategic wet-chemical combination of activated charcoal with copper zirconate for enhanced electrocatalytic performance

Batool,

Rashid,

Nazir

et al. 2023

J Mater Sci: Mater Electron

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Composite Fayalite with 5% Laterite Soil and Iron Sand: Structural Properties and Band Gap Calculation Based on Theoretical Kubelka–Munk, Taylor Expansion, and Self-Consistent Field Method

Cited by 6 publications

References 51 publications

Proximity Porosity and Crystallinity Analysis as Clay/Nickel Slag Characteristics for Material Stabilization Application

Proximity Porosity and Crystallinity Analysis as Clay/Nickel Slag Characteristics for Material Stabilization Application

Nanolayered Ti₄N₃T_x MXene Retains Its Electrocatalytic Properties after Prolonged Immersion in Solvents

Strategic wet-chemical combination of activated charcoal with copper zirconate for enhanced electrocatalytic performance

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Composite Fayalite with 5% Laterite Soil and Iron Sand: Structural Properties and Band Gap Calculation Based on Theoretical Kubelka–Munk, Taylor Expansion, and Self-Consistent Field Method

Cited by 6 publications

References 51 publications

Proximity Porosity and Crystallinity Analysis as Clay/Nickel Slag Characteristics for Material Stabilization Application

Proximity Porosity and Crystallinity Analysis as Clay/Nickel Slag Characteristics for Material Stabilization Application

Nanolayered Ti4N3Tx MXene Retains Its Electrocatalytic Properties after Prolonged Immersion in Solvents

Strategic wet-chemical combination of activated charcoal with copper zirconate for enhanced electrocatalytic performance

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Nanolayered Ti₄N₃T_x MXene Retains Its Electrocatalytic Properties after Prolonged Immersion in Solvents