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Adsorption performance of mineral-carbon adsorbents derived from coal gasification fine ash: Prepared via low-temperature alkali fusion method.
Chen, Zhichao; Tian, Xiaodong; Hou, Jian; Li, Zhengqi.
Afiliação
  • Chen Z; School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, China; Zhengzhou Research Institute of Harbin Institute of Technology, Zhengzhou, 450046, China. Electronic address: chenzc@hit.edu.cn.
  • Tian X; School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, China; Zhengzhou Research Institute of Harbin Institute of Technology, Zhengzhou, 450046, China. Electronic address: xiaodongtian92@163.com.
  • Hou J; School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, China; Zhengzhou Research Institute of Harbin Institute of Technology, Zhengzhou, 450046, China. Electronic address: 1481225826@qq.com.
  • Li Z; School of Energy Science and Engineering, Harbin Institute of Technology, 92, West Dazhi Street, Harbin, 150001, China; Zhengzhou Research Institute of Harbin Institute of Technology, Zhengzhou, 450046, China. Electronic address: green@hit.edu.cn.
Environ Res ; 248: 118311, 2024 May 01.
Article em En | MEDLINE | ID: mdl-38278511
ABSTRACT
To address the solid waste challenges associated with coal gasification fine ash, this study conducted a low-temperature alkali fusion de-ashing treatment to transform coal gasification fine ash into mineral-carbon adsorbent. The preparation process was simplified without grinding, carbonization and high-temperature (500-800 °C) activation treatment. The results demonstrate a positive linear correlation between the ash removal rate of the samples (measured during the preparation process, i.e., low-temperature alkaline fusion treatment of coal gasification fine ash) and their maximum equilibrium adsorption capacity for methylene blue. For the samples with an ash removal rate of 95.71 %, which exhibit a maximum adsorption capacity of 161.36 mg/g for methylene blue. The adsorption behavior of methylene blue on mineral-carbon adsorbent was a monolayer adsorption on the surface of homogeneous medium, involving both physical and chemical adsorption. The main adsorb rate-controlling steps for the samples with ash removal rates of 27.91-59.33 % and 95.71 % were the intra particle diffusion process and the liquid film diffusion process, respectively. The adsorption mechanism of methylene blue on the surface of mineral-carbon adsorbent involved electrostatic attraction and hydrogen bonding. The aforementioned results demonstrated the potential of coal gasification fine ash as an adsorbent material, providing new options for promoting the resource utilization and high-value applications of coal gasification fine ash.
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Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Cinza de Carvão Idioma: En Revista: Environ Res Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Bases de dados: MEDLINE Assunto principal: Poluentes Químicos da Água / Cinza de Carvão Idioma: En Revista: Environ Res Ano de publicação: 2024 Tipo de documento: Article