Enhanced Transport and Transformation of Zerovalent Nanoiron in Clay Using Direct Electric Current
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- 作者：Helena I. Gomes (1) (2) (3)
Celia Dias-Ferreira (3)
Alexandra B. Ribeiro (2)
Sibel Pamukcu (1) - 关键词：Zerovalent iron nanoparticles (nZVI) ; Enhanced transport ; Direct current ; Electrokinetics ; Electrochemical treatment
- 刊名：Water, Air, and Soil Pollution
- 出版年：2013
- 出版时间：December 2013
- 年：2013
- 卷：224
- 期：12
- 全文大小：
- 作者单位：Helena I. Gomes (1) (2) (3)
Celia Dias-Ferreira (3)
Alexandra B. Ribeiro (2)
Sibel Pamukcu (1)
1. Department of Civil and Environmental Engineering, Fritz Engineering Laboratory, Lehigh University, 13 E. Packer Avenue, Bethlehem, PA, 18015-4729, USA
2. CENSE, Departamento de Cicias e Engenharia do Ambiente, Faculdade de Cicias e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal
3. Instituto Politnico de Coimbra, CERNAS Research Center for Natural Resources, Environment and Society, Campus da Escola Superior Agria de Coimbra, Bencanta, 3040-316, Coimbra, Portugal - ISSN：1573-2932
文摘
One of the major obstacles to zerovalent iron nanoparticles (nZVI) application in soil and groundwater remediation is the limited transport, especially in low-permeability soils. In this study, direct current (constant potential of 5.0V) was used to enhance polymer-coated nZVI mobility in different porous media, including a bed of glass beads and kaolin clay. The tests were conducted using a modified electrophoretic cell and with nZVI concentrations typical of field applications (4gL1). Experimental results indicate that the use of direct current can enhance the transport of the polymer-modified nanoparticles when compared with natural diffusion in low permeability or surface neutral porous medium. The applied electric field appeared to enhance the oxidationeduction potential, creating a synergistic effect of nZVI usage with electrokinetics. Aggregation of the nanoparticles, observed near the injection point, remained unresolved.