Efficient Removal of Arsenic from Water by Dielectrophoresis-Assisted Adsorption
Cui.C.Y1, 2, Chen.H.Y1, 2*, Wang.Y1, 2, Yang.G1, 2, Xing.X1, 2, Li.H1, 2, Geng J.F3
Affiliation
- 11College of Life and Environmental Science, Minzu University of China, Beijing, China
- 2Beijing Engineering Research Center of Food Environment and Public Health, Minzu University of China, Beijing, China
- 3Institute for Materials Research and Innovation, Institute for Renewable Energy and Environmental Technologies, University of Bolton, Bolton, UK
Corresponding Author
Chen.H.Y, College of Life and Environmental Science, Minzu University of China, Beijing, China; Beijing Engineering Research Center of Food Environment and Public Health, Minzu University of China, Beijing, 100081, China; Fax: 0086 10 68932633; Tel: +8613910159837; E-mail: huiyingrchen@aliyun.com
Citation
Chen, H.Y., et al. Efficient Removal of Arsenic from Water by Dielectrophoresis-Assisted Adsorption. (2016) J Environ Health Sci 2(2): 1-4.
Copy rights
© 2016 Chen, H.Y. This is an Open access article distributed under the terms of Creative Commons Attribution 4.0 International License.
Keywords
Abstract
Adsorption (ADS) and dielectrophoresis (DEP) technique were combined (ADS/DEP) to efficiently remove As (V) in aqueous solution. Fly ash, activated carbon, corncob and plant ash were tested to determine the best adsorbent by their adsorption capacity. Plant ash showed the highest adsorption capacity compared with the others. Different parameters such as solution pH, adsorbent dose were explored. The maximum arsenic removal efficiency was 91.4% when the pH was 9.0 and adsorbent dose 5 g/L with 7.5 mg/L initial concentration. With the ADS/DEP technique, the plant ash particles with adsorbed arsenic ions were trapped to the electrodes in a DEP device. The ADS/DEP process can increase the removal efficiency of As (V) to 94.7% at 14 V even when the initial concentration of As (V) was 15 mg/L. And the residual concentration of As (V) decreased to 0.34 mg/L after two series of ADS/DEP process. The adsorbents before and after DEP were examined by a scanning electron microscope (SEM) and energy dispersive X-ray (EDX) analysis. After DEP process, the weight percentage of As (V) on the adsorbents surface increased to 0.96% from 0.5%. The ADS/DEP process could be a new efficient way to remove the arsenic pollutant in water matrices at high concentrations.