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Multifunctional use of magnetite-coated tuff grains in water treatment: Removal of arsenates and phosphates

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2019
Authors
Savić, Andrija B.
Čokeša, Đuro
Savić-Biserčić, Marjetka
Častvan-Janković, I
Petrović, Rada
Živković, Ljiljana
Article (Published version)
,
© 2019 The Society of Powder Technology Japan
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Abstract
Natural filtration material tuff (T) was modified by coating with nano-sized magnetite. The grain fraction of 0.6–1.9 mm was submitted to hydrothermal synthesis of magnetite. Thus formed magnetite modified tuff (MMT) was characterized in terms of Fe-content, N2 adsorption- desorption isotherm, SEM, zeta potential-pH analyses and adsorption behavior towards phosphates/arsenates in batch and column conditions. Elemental analysis showed that 36.54 mg g−1 of magnetite was attached to the porous tuff grains. This modification changed pore structure and specific surface area. An increase of cca 35% in Sp value was obtained. Batch experiments proved that MMT was 4-5 times more efficient in removal of phosphates/arsenates than non-modified T. The maximum sorption capacities of phosphates calculated based on Langmuir equation were 0.45 and 1.91 mg g−1, while those for arsenate were 0.551 m g−1 and 2.36 mg g−1 for T and MMT, respectively. The intra-particle diffusion model was the most suited fo...r describing the adsorption process of phosphate and arsenate onto MMT. Fixed-bed column data corroborated batch results, i.e. MMT was 6 times superior in contaminant adsorption than T. Modification with magnetite improved T potential for usage in water treatment applications: its filtration ability remained unchanged, while adsorption capacity for phosphates/arsenates removal was improved. © 2019 The Society of Powder Technology Japan

Keywords:
Tuff / Magnetite / Arsenate / Phosphate / Adsorption
Source:
Advanced Powder Technology, 2019, 30, 8, 1687-1695
Projects:
  • Synthesis, processing and characterization of nanostructured materials for application in the field of energy, mechanical engineering, environmental protection and biomedicine (RS-45012)
  • Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)

DOI: 10.1016/j.apt.2019.05.020

ISSN: 0921-8831; 1568-5527

WoS: 000471847800030

Scopus: 2-s2.0-85066492267
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URI
https://linkinghub.elsevier.com/retrieve/pii/S0921883119301529
http://vinar.vin.bg.ac.rs/handle/123456789/8221
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Vinča

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