Barrier effect of coal bottom ash-based geopolymers on soil contaminated by heavy metals

Dong, Yiqie; Zhou, Min; Xiang, Yuwei; Wan, Sha; Li, He; Hou, Haobo

doi:10.1039/c9ra05542h

Cited by 12 publications

(9 citation statements)

References 53 publications

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“…When the attraction becomes weaker, the energy required to remove the electron also reduces. One possible cause for the lower shifted binding energy value is the ability of OH – ions to coordinate with the Al or Si atoms on the surface of the alumino-silicate minerals and disrupt the arrangement …”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 4(b), the Al 2p A peak which corresponds to Al 2 O 3 in alumino-silicates 37,38 shifted to a lower binding energy value from 74.38 eV of CFA-Raw to 74.28 eV of CFA-H 2 O, to 74.08 eV of CFA-NaOH 1 M, and to 73.58 eV of CFA-NaOH 3 M. Low intensity of the Al 2p B peak was detected in CFA-Raw (76.38 eV), which corresponds to AlO(OH). 37 The Al 2p B peak was not detected in CFA-H 2 O and detected in CFA-NaOH 1 M and CFA-NaOH 3 M with a binding energy of 71.68 eV for both cases, which corresponds to Al.…”

Section: Investigation Of the Role Of Alkali Activator On Cfamentioning

confidence: 93%

“…One possible cause for the lower shifted binding energy value is the ability of OH − ions to coordinate with the Al or Si atoms on the surface of the alumino-silicate minerals and disrupt the arrangement. 38 ATR FT-IR was employed to observe the chemical bonds in the CFA samples before and after carbonation with CO 2 . In the wavenumber range of 500−2000 cm −1 , there are three characteristic peaks that can be observed in the samples before carbonation with CO 2 , as seen in Figure 5 ), making it the main focus of this analysis.…”

Section: Investigation Of the Role Of Alkali Activator On Cfamentioning

confidence: 99%

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Effects of Alkali-Treated Coal Fly Ash on Carbonation Efficiency and Its Implication for Carbon Mineralization

Triwigati,

Sim,

Seo

et al. 2024

Ind. Eng. Chem. Res.

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The CO 2 storage capacity in coal fly ash (CFA) for carbon mineralization is often limited due to the dominance of the alumina-silicate phase on its particle surface. This study aims to enhance the carbonation efficiency by using the alkaline activator. H 2 O and NaOH solutions (1 and 3 M) were mixed with CFA with an L/S ratio of 0.15, respectively, and were carbonated using a direct gas−solid reaction. The highest carbonation efficiency was 43.57% for CFA-NaOH 3 M, while CFA-Raw had the lowest. With the NaOH addition, the binding energy shifted to a lower value for Si 2p and Al 2p in X-ray photoelectron spectroscopy (XPS) analysis and Si−O−Al bond was also shifted to a lower wavenumber in attenuated total reflectance Fourier-transform infrared (ATR FT-IR) analysis. Both analyses show how OH − ions affect the alumino-silicate bonds and disrupt their arrangement. X-ray diffraction (XRD) analysis revealed the appearance of Na−Ca−Si-hydrate, which turned into gaylussite (another carbonate form), which increased the amount of CO 2 stored in CFA.

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Section: Resultsmentioning

confidence: 99%

Section: Investigation Of the Role Of Alkali Activator On Cfamentioning

confidence: 93%

Section: Investigation Of the Role Of Alkali Activator On Cfamentioning

confidence: 99%

See 1 more Smart Citation

Effects of Alkali-Treated Coal Fly Ash on Carbonation Efficiency and Its Implication for Carbon Mineralization

Triwigati,

Sim,

Seo

et al. 2024

Ind. Eng. Chem. Res.

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“…Buchwald proved the feasibility of the method by adjusting the concentration of ions to improve the chemical activity of the reaction products (Buchwald et al 2007). Studies have also been conducted on the treatment of wastewater and contaminated soil with active BA (Dong et al 2019), but their constituent treatment technologies still have shortcomings, such as high preparation cost (high calcination temperature requirements or expensive alkaline materials), unstable adsorption effect, poor mechanical properties, and so on (Bertolini et al 2004, Canpolat et al 2004, Wang 2008). These issues limit the use of these products in engineering.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Ni–Co ore mining mullock powder based cementing materials by mechano-chemical activation: Performance and Mechanism

Xiang

Lan

Cai

et al. 2023

Preprint

Self Cite

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How to effectively recycle Ni–Co ore mining mullock (OMM) is a key means to address both local environmental pollution and resource waste. In this study, OMM and bottom ash (BA) were prepared into cementitious materials (OBM) by mechanochemical means with gentle conditions. It is mainly realized by grinding the mixture and pressing it into columnar blocks. The results show that the maximum compressive strength of OBM is 4.803 MPa in 28 day meet the standard of China mine backfilling for mine repair, and the stability efficiency of Ni2+ and Co2+ is above 90%. The mechanism studies show that the amorphous materials recombine to form silicon-aluminum polymers, while a small portion of Ni2+ and Co2+ binds to the polymer during consolidation to form massive structure. Most of the heavy metal ions are encased in the hard structure, which is relatively stable and without pollution risk. The chemical behavior of metals in the system is fitted by geochemical model. This study not only solved the problem of heavy metal contamination in OMM, but also transformed it into a cementitious material that can be used for backfilling of local pits.

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“…which saves time and so on. While Ji et al, (2019) and Dong et al, (2019) have also successfully produced this coal ash -based material and serve as a heavy metal trap found in wastewater from factories and soils.…”

Section: Introductionmentioning

confidence: 99%

Potential of Coal Bottom Ash as Fine Aggregates in The Production of Lightweight Brick

Arshad¹,

Zailani²,

Wahab³

et al. 2022

JSCET

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The use of coal bottom ash, a by-product from the coal burning process in lightweight bricks production is getting more attention worldwide including in Malaysia. The main objective of this research is to assess the extended potential of bottom ash to produce lightweight bricks. The green technology-based lightweight bricks in this study are designed using the by-product resulting from the burning of pulverized coal in thermal power plants for electric power generations. The burning of pulverized coal was questioned extensively over the last decades due to the carbon dioxide emission which is about 2.0 billion tons annually. These lightweight bricks are produced from the combination of specifically graded bottom ash, classified pozzolanic ashes, fine aggregates, Ordinary Portland Cement, and water. The lightweight bricks were subjected to a few laboratory assessments including compressive strength test, density test, and water absorption test. It was observed that the C2 brick and C3 brick at 60% and 100% addition of bottom ash, respectively had comparable compressive strength with other commercialized bricks (cement-sand brick and clay brick). The addition of coal bottom ash also produces the lowest density of the bricks which is about 1.2 kg/m3. Comparison with other commercialized bricks available in the market in terms of compressive strength, density, and water absorption indicated that the bottom ash-based bricks are stronger and lighter. A comprehensive selection of good quality materials and the selected mix design produced an acceptable quality of bricks that can be considered as part of the actual construction materials. Thus, with the production of this light and strong brick, the volume of the coal ash waste that was dumped in the landfill will be substantially reduced and simultaneously the lighter bricks will reduce the dead loads supported by the main structures of the building.

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Barrier effect of coal bottom ash-based geopolymers on soil contaminated by heavy metals

Abstract: Coal bottom ash (CBA) was modified on the basis of the engineering problems of low resource utilization of CBA and difficulty in treating HMS through alkali activation to synthesize geopolymers and solidify heavy metal-contaminated soil (HMS).

Cited by 12 publications

References 53 publications

Effects of Alkali-Treated Coal Fly Ash on Carbonation Efficiency and Its Implication for Carbon Mineralization

Effects of Alkali-Treated Coal Fly Ash on Carbonation Efficiency and Its Implication for Carbon Mineralization

Preparation of Ni–Co ore mining mullock powder based cementing materials by mechano-chemical activation: Performance and Mechanism

Potential of Coal Bottom Ash as Fine Aggregates in The Production of Lightweight Brick

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