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Magnetic nanocomposite microbial extracellular polymeric substances@Fe3O4 supported nZVI for Sb(V) reduction and adsorption under aerobic and anaerobic conditions.
- Source :
-
Environmental Research . Oct2020, Vol. 189, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- The extracellular polymeric substances coating magnetic powders-supported nano zero-valent iron (nZVI@EPS@Fe 3 O 4) was synthesized, using reduction and adsorption to treat Sb(V) wastewater. The adsorption performance and mechanism were investigated under aerobic and anaerobic conditions. The adsorption capacity of nZVI@EPS@Fe 3 O 4 (79.56 mg/g at pH = 5) was improved compared to that of the original materials (60.74 mg/g). The spectral analysis shows that both nZVI and EPS@Fe 3 O 4 in nZVI@EPS@Fe 3 O 4 played an important role in reducing Sb(V) to Sb(III) and adsorbing Sb. The reducibility and adsorption capacity of nZVI@EPS@Fe 3 O 4 towards Sb(V) remained strong under aerobic condition (62% Sb(III), 79.56 mg/g), although they were slightly weaker than those under anaerobic condition (74% Sb(III), 91.78 mg/g). nZVI@EPS@Fe 3 O 4 showed good performance in regeneration experiments. nZVI@EPS@Fe 3 O 4 is promising as a cost-effective and highly efficient material for Sb(V)-contaminated water. This study is meaningful in understanding the redox behaviour of nZVI composites in aerobic and anaerobic conditions. • nZVI@EPS@Fe 3 O 4 improved Sb adsorption capacity compared to original materials. • Reducibility/adsorbability were compared under aerobic/anaerobic conditions. • Sb(V) reducibility/adsorbability remained strong under aerobic condition. • Functional groups on magnetic EPS were also responsible for Sb(V) reduction. • nZVI@EPS@Fe 3 O 4 showed great recycling performance. [ABSTRACT FROM AUTHOR]
- Subjects :
- *ADSORPTION (Chemistry)
*VERSTEHEN
*FUNCTIONAL groups
Subjects
Details
- Language :
- English
- ISSN :
- 00139351
- Volume :
- 189
- Database :
- Academic Search Index
- Journal :
- Environmental Research
- Publication Type :
- Academic Journal
- Accession number :
- 146038764
- Full Text :
- https://doi.org/10.1016/j.envres.2020.109950