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- Title
As(V) removal from arsenic wastewater by fibrous anion exchangers.
- Authors
Seung-Chan Lee; Jin-Kyu Kang; Eun-Hye Sim; Nag-Choul Choi; Song-Bae Kim
- Abstract
The aim of the present study was to investigate the removal of As(V) from arsenic wastewater by fibrous anion exchangers (KaracaronTM KC31 and SA). Our analysis indicated that the pristine KC31 was a free amine form, whereas the pristine SA was fully protonated. Fourier-transform infrared spectrometer and X-ray photoelectron spectroscopy analyses demonstrated that the protonated amine groups were responsible for the anion exchange of As(V). Batch experiments showed that in the removal of As(V), KC31 behaved differently from SA in response to pH change. The As(V) removal for KC31 was the highest at a pH of 3, whereas the As(V) removal for SA reached the maximum at a pH of 10. The fibers could be successfully regenerated with 0.1 M NaCl solution and reused over five adsorption-desorption cycles. Batch experiments in the high arsenic content wastewater (As(V) concentration = 98.798 mmol/L [7,402.3 mg/L]; pH = 2.9) demonstrated that KC31 was effective in the removal of As(V) from the arsenic wastewater, even in the presence of other anionic contaminants (chromate, sulfate, etc.). The As(V) removal capacity of KC31 (2.941 mmol/g) at the fiber dose of 2 g/L was higher than the As(V) removal capacities of anion exchangers (0.146-2.497 mmol/g) reported in the literature. Unlike KC31, the As(V) removal by SA from the arsenic wastewater was negligible, possibly due to the acidic pH of the wastewater along with the competitive effect of other anionic contaminants.
- Subjects
SEWAGE; X-ray photoelectron spectroscopy; IR spectrometers; ANIONS; X-ray spectrometers; ARSENIC removal (Groundwater purification); ARSENIC removal (Water purification)
- Publication
Desalination & Water Treatment, 2017, Vol 90, p273
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2017.21446