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- Title
Kinetics and thermodynamics of adsorption for arsenate ions on the hierarchical porous adsorbent of α-Fe<sub>2</sub>O<sub>3</sub>/Fe<sub>3</sub>O<sub>4</sub>/C with bamboo bio-template.
- Authors
Yanhong Li; Yinian Zhu; Zongqiang Zhu; Wenhui Wei; Huan Deng; Yanpeng Liang; Xuehong Zhang; Dunqiu Wang
- Abstract
A novel hierarchical porous adsorbent of a-Fe2O3/Fe3O4/C (HPA-Fe/C-B) was prepared with bamboo bio-template and investigated for its adsorption capacity of arsenic(V). The result indicated that the HPA-Fe/C-B adsorbent had a specific surface area of 198.1 m2/g and retained the hierarchical porous microstructure of bamboo with three kinds of pores (widths 50~75 µm, 1~30 µm and 0.0017~0.2891 µm) originating from vessels, fibres or parenchyma cells and pits on the walls of the vessels and parenchyma cells, respectively. With increasing initial arsenic(V) concentrations from 5 mg/L to 100 mg/L, the amounts of arsenic(V) adsorbed on the pulverized HPA-Fe/C-B adsorbent (<0.149 mm) increased from 0.50 mg/g to 4.55 mg/g at 25°C, from 0.50 mg/g to 5.33 mg/g at 35°C and from 0.50 mg/g to 4.89 mg/g at 45°C. The corresponding removal rates decreased from 99.97% to 45.58% at 25°C, from 99.98% to 53.30% at 35°C and from 100.00% to 48.94% at 45°C. At the initial arsenic(V) concentrations of 5, 10 and 50 mg/L, the adsorption capacities for the un-pulverized HPA-Fe/C-B adsorbent (>3 mm) were 0.45, 0.86 and 3.02 mg/g, respectively, which were nearly equal to the mean value for iron oxides particles or nanoparticles. The pseudo-second-order kinetic model fitted the experimental data very well. The adsorption followed both Langmuir and Freundlich isotherms.
- Subjects
ARSENIC removal (Water purification); ADSORPTION kinetics; IRON oxide nanoparticles; BAMBOO; ARSENATES; LANGMUIR isotherms
- Publication
Desalination & Water Treatment, 2017, Vol 76, p276
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2017.20721