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A novel stabilized carbon-coated nZVI as heterogeneous persulfate catalyst for enhanced degradation of 4-chlorophenol.

Abstract：

:Nano zero-valent iron (nZVI) and its composite materials have been extensively studied in the field of environmental remediation. However, the oxidation and agglomeration of nZVI limits the large-scale application of nZVI in environmental remediation. This study developed a two-step method to prepare stable carbon-coated nZVI (Fe0@C) which combined hydrothermal carbonization and carbothermal reduction methods and used glucose and iron oxide (Fe3O4) as precursors. When the carbothermal reduction temperature was 700 °C and the elemental molar ratio of carbon to iron was 22:1, stable Fe0@C can be generated. The nZVI particles are encapsulated by mesoporous carbon and embedded in the carbon spheres. The unique structure of carbon coating not only inhibits the agglomeration of nZVI, but also makes nZVI stable in air for more than 120 days. Not only that, the as-synthesized Fe0@C exhibited high catalytic activity toward the degradation of 4-chlorophenol (4-CP) by activating persulfate. Different from conventional nZVI catalysts in generation of sulfate radicals, Fe0@C selectively induced hydroxyl radicals for 4-CP degradation. Moreover, Fe0@C has been shown to efficiently degrade 4-CP by using the dissolved oxygen in water to form hydroxyl radicals. This study not only provides a simple, green method for the preparation of stabilized nZVI, but also provides the possibility of large-scale application of nZVI in the field of environmental remediation.

journal_name

Environ Int

journal_title

Environment international

authors

Li S,Tang J,Liu Q,Liu X,Gao B

doi

10.1016/j.envint.2020.105639

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

105639

eissn

0160-4120

issn

1873-6750

pii

S0160-4120(19)34333-8

journal_volume

138

pub_type

杂志文章

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