Chloride adsorption of synthetic individual reaction products in alkali-activated fly ash

Wu, Yuchen; Cai, Weixi; Xu, Zhipeng; Hu, Jie; Ma, Yuwei; Zhang, Zuhua; Huang, Haoliang; Wei, Jiangxiong

doi:10.1016/j.conbuildmat.2023.132483

Construction and Building Materials

2023

DOI: 10.1016/j.conbuildmat.2023.132483

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Chloride adsorption of synthetic individual reaction products in alkali-activated fly ash

Yuchen Wu

Weixi Cai

Zhipeng Xu

et al.

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2024

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Cited by 2 publications

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The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C₃N₄‐based Materials

Yu,

Li,

Wang

et al. 2024

ChemistrySelect

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Regulating the polymerization of graphitic carbon nitride (g‐C3N4) precursor is regarded as a desirable pathway to boost its photocatalytic activity. However, the current has been seldomly concerned in adjusting the polymerization of g‐C3N4 precursor based on the structural characteristics of fly ash (FA). This study manipulates the polymerization reaction of dicyandiamide through alkali treatment of fly ash (KOH‐FA, CaOH‐FA and NaOH‐FA), yielding three g‐C3N4‐based composite photocatalysts (CaFA‐CN, KFA‐CN, and NaFA‐CN) with varying degrees of polymerization. Compared to the zeolite structures of fly ash treated with potassium hydroxide (KOH) and sodium hydroxide (NaOH), the fly ash treated with calcium hydroxide (Ca(OH)2) developed calcium silicate hydrate, leading to a more complex surface structure. Isotherm adsorption model analysis revealed that Ca(OH)2‐FA's adsorption of methylene blue fits the Freundlich model, indicating uneven distribution of active sites. This unevenness results in an uneven collision probability during the high‐temperature polymerization of dicyandiamide, leading to incomplete polymerization and the formation of the CaFA‐CN catalyst with more amino groups and fewer carbon‐nitrogen heterocycles. This incomplete polymerization enabled CaFA‐CN to achieve a 55.3% degradation efficiency of methylene blue within 60 minutes. The photocatalytic activity of CaFA‐CN is 4.03 times that of the original g‐C3N4 (19.4%).

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The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C₃N₄‐based Materials

Yu,

Li,

Wang

et al. 2024

ChemistrySelect

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Geopolymer composites for marine application: Structural properties and durability

Li,

Zhang,

Deng

et al. 2024

Cement and Concrete Composites

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Chloride adsorption of synthetic individual reaction products in alkali-activated fly ash

Cited by 2 publications

References 48 publications

The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C₃N₄‐based Materials

The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C₃N₄‐based Materials

Geopolymer composites for marine application: Structural properties and durability

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Chloride adsorption of synthetic individual reaction products in alkali-activated fly ash

Cited by 2 publications

References 48 publications

The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C3N4‐based Materials

The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C3N4‐based Materials

Geopolymer composites for marine application: Structural properties and durability

Contact Info

Product

Resources

About

The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C₃N₄‐based Materials

The Effects of Modified Fly Ash on the Structure and Photocatalytic Performance of G‐C₃N₄‐based Materials