Journal
CHEMICAL ENGINEERING JOURNAL
Volume 404, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.126997
Keywords
Ball milling; FeS@BC; Persulfate; Tetracycline; Reaction mechanism
Categories
Funding
- National Key R&D Program of China [2018YFC1802002]
- Opening Fund of National Engineering Laboratory for Site Remediation Technology [JGXF19-J055-01]
- National Natural Science Foundation of China [U1806216, 41807363]
- Ministry of Education, China [T2017002]
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In this study, a composite material of iron sulfide and biochar (FeS@BC) was synthesized using physical ball milling and applied for the oxidative removal of tetracycline in the presence of persulfate. The FeS@BC showed promising efficiency in degrading tetracycline, with biochar playing a facilitating role in the system.
In this study, composite of iron sulfide and biochar (FeS@BC) was synthesized successfully via physical ball milling and applied to the oxidative removal of tetracycline (TC) in the presence of persulfate (PS). Characterization results showed that FeS@BC, which has a small particle size, can be synthesized at a preset FeS-BC mass ratio. In addition, the ball-milled FeS@BC showed sufficient ferromagnetism. The effects of pH, dosages of FeS@BC and PS, and co-existing anions on TC degradation were investigated. Our results showed that TC degradation efficiency was enhanced at low pH and high dosages of PS and FeS@BC. Under optimal conditions (pH = 3.6, [FeS@BC] = 0.3 g/L and [PS] = 10 mA4), a TC removal efficiency of 87.4% could be achieved after 30 min. Nevertheless, the TC removal rate was slightly inhibited by inorganic anions in the order of CO32- > Cl- > NO3-. Surface-bound Fe(II) and S(II) acted as electron donors in the activation process and generated SO4 and 'OH at the surface of FeS@BC. In addition, S(II) also participated in Fe(III) reduction. BC not only reduced the agglomeration of FeS, serving as a continuous source of effective Fe, but also acted as an electron shuttle and a suitable carbon-based adsorption material, facilitating fast electron transfer among PS, electron donors, and pollutants. Moreover, non-radical degradation processes might also exist in the FeS@BC/PS/TC system. The FeS@BC could be a promising effective activator for the remediation of other emerging organic contaminants.
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