期刊
CHEMICAL ENGINEERING JOURNAL
卷 417, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.129199
关键词
Few-layered-graphene; Iron nanoparticle; Water remediation; Arsenic; Nutrient; Heavy metal
资金
- USDA Forest Service [16-JV-11111124-075]
This study synthesized lignin-derived FLG@Fe-0 particles with excellent stability and adsorption performance for water remediation, showing high uptake capacities for Pb(II), As(III), phosphate, and nitrate. The innovative adsorbent could offer a green and economic alternative to traditional nZVI adsorbents.
The potential of iron nanoparticles as adsorbents for water remediation has not been fully exploited because of their intrinsically low stability. Herein, few-layered graphene-encapsulated iron nanoparticles (FLG@Fe-0) supported on and within lignin-derived carbon were synthesized via an in-situ thermal conversion of ferric nitrate-loaded kraft lignin, i.e., ferric nitrate as a Fe source and lignin as a carbon source. The structure and morphology analyses indicated that these lignin-based FLG@Fe-0 particles sized 5-15 nm in diameter were composed of nanoscale zero-valent iron (nZVI) cores shelled with 1-3 graphene layers. The 'few-layered' graphene shell protects nZVI cores from fast passivation. The lignin-derived carbon support prevents the FLG@Fe-0 sites from agglomeration. These two features can enhance the stability and applicability of FLG@Fe-0 for water remediation. Consequently, these lignin-based FLG@Fe-0 particles exhibited superior uptake capacities of 127.5, 107.2, 214.7, and 356.8 mg/g for Pb(II), As(III), phosphate, and nitrate, respectively. The removal mechanism analyses indicated that precipitation, redox reaction, and catalytic degradation were involved. This versatile lignin-derived carbon-supported FLG@Fe-0 particles (LC-FLG@Fe-0) could be a promising renewable adsorbent for offering green and economic alternatives to conventional nZVI adsorbents synthesized using hazardous and expensive NaBH4 process.
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