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As(V) adsorption by FeOOH@coal gangue composite from aqueous solution: performance and mechanisms.
- Source :
- Environmental Technology; Sep2024, Vol. 45 Issue 21, p4376-4387, 12p
- Publication Year :
- 2024
-
Abstract
- Arsenic (As) pollution in water poses a significant threat to the ecological environment and human health. Meanwhile, the resource utilisation of coal gangue is of utmost importance in ecologically sustainable development. Thus, the FeOOH@coal gangue composite (FeOOH@CG) was synthesised for As(V) adsorption in this study. The results showed that α-FeOOH, β-FeOOH and Schwertmannite loaded on the surface of FeOOH@CG. Moreover, the adsorption behaviour of As(V) by FeOOH@CG was investigated under different reaction conditions, such as pH, contact time, initial concentration and co-existing anions. The optimum adsorption conditions were as follows: initial As(V) concentration of 60 mg/L, pH of 3.0 and adsorption time of 180–240 h. The adsorption capacity of FeOOH@CG for As(V) was pH-dependent and the maximum adsorption capacity was 185.94 mg/g. The presence of anions (${\rm H}_ 2{\rm PO}_4^-$ H 2 PO 4 − , ${\rm HCO}_3^-$ HCO 3 − and ${\rm C}{\rm l}^-$ C l − ) decreased the adsorption efficiency of FeOOH@CG for As(V). The adsorption process of FeOOH@CG for As(V) could be well-described by the pseudo-second-order model and Langmuir model, indicating that the adsorption process mainly depended on chemical adsorption. The thermodynamic analysis suggested that the adsorption was a spontaneous and endothermic process. In addition, according to the analyses of XRD, FTIR and XPS, the dominant mechanisms of As(V) adsorption by FeOOH@CG were electrostatic attraction, complexation and precipitation. In conclusion, FeOOH@CG has great potential as an efficient and environmentally friendly adsorbent for As(V) adsorption from aqueous solution. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09593330
- Volume :
- 45
- Issue :
- 21
- Database :
- Complementary Index
- Journal :
- Environmental Technology
- Publication Type :
- Academic Journal
- Accession number :
- 179255655
- Full Text :
- https://doi.org/10.1080/09593330.2023.2251655