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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Yang, Zhangmei Qiu, Xinhong Fang, Zhanqiang Pokeung, Tsang |
| Description | Author Affiliation: Yang Z ( School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China E-mail: sunmoon124@163.com.); Qiu X ( School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China E-mail: sunmoon124@163.com.); Fang Z ( School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China E-mail: sunmoon124@163.com.); Pokeung T ( Department of Science and Environmental Studies, The Hong Kong Institute of Education, Hong Kong 00852, China.) |
| Abstract | Effective in situ remediation of groundwater requires the successful delivery of reactive iron particles through sand. However, the agglomeration of nano zero-valent iron (NZVI) particles limits the migration distance, which inhibits their usefulness. In the study described herein, NZVI supported by mesoporous silica microspheres covered with FeOOH (SiO2@FeOOH@Fe) was synthesized, and its mobility was demonstrated on the basis of transport in porous media. Degradation of decabromodiphenyl ether (BDE209) was more efficient by SiO2@FeOOH@Fe than by 'bare' NZVI. Breakthrough curves and mass recovery showed the mobility of SiO2@FeOOH@Fe in granular media was better than that of bare NZVI. It increased greatly in the presence of natural organic matter (NOM) and decreased when high Ca2+ and Mg2+ concentrations were encountered. Analysis of the transport data on the basis of filtration theory showed diffusion to be the main mechanism for particle removal in silicon sand. Increasing the NOM may decrease agglomeration of the grains of sand, which has a positive effect on the mobility of SiO2@FeOOH@Fe. Presumably, increasing the concentrations of Ca2+ and Mg2+ compresses the diffuse double layer of SiO2@FeOOH@Fe, resulting in a reduction of mobility. |
| File Format | HTM / HTML |
| ISSN | 02731223 |
| Issue Number | 12 |
| Volume Number | 71 |
| e-ISSN | 19969732 |
| Journal | Water Science & Technology |
| Language | English |
| Publisher | IWA Publishing |
| Publisher Date | 2015-01-01 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | Subscribed |
| Subject Keyword | Discipline Hydrology Iron Chemistry Metal Nanoparticles Microspheres Silicon Dioxide Environmental Restoration And Remediation Methods Filtration Instrumentation Groundwater Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Engineering Water Science and Technology |
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