Tuning the charge carrier density and exciton pair separation in electrospun 1D ZnO-C composite nanofibers and its effect on photodegradation of emerging contaminants

Gadisa, Bekelcha Tesfaye; Kassahun, Shimelis Kebede; Appiah-Ntiamoah, Richard; Kim, Hern

doi:10.1016/j.jcis.2020.03.002

Cited by 26 publications

(9 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With regard to Co 2p 3/2 , the peaks at the binding energies of 778.7 (780.3) and 781.5 (782.2) eV suggest the presence of Co 3+ and Co 2+ , respectively, while with respect to Co 2p 1/2 , based on the Co 2p 1/2 spectra, the two peaks at the binding energy values of 793.7 (795.8) and 797.4 (798.0) eV verify the existence of Co 3+ and Co 2+ , respectively. Moreover, according to Figure S8f, the two peaks at binding energies of 1022.4 and 1045.4 eV are consistent with Zn 2p 3/2 and Zn 2p 1/2 characteristic peaks, respectively, , which indicate that the desulfurization product is a mixture of Co 9 S 8 and ZnS.…”

Section: Resultssupporting

confidence: 59%

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Zhang

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

Desulfurization sorbent with a high active component utilization is of importance for the removal of H 2 S from coal gas at high temperatures. Thus, the hypothesis for producing Zn x Co 3−x O 4 /carbon nanofiber sorbents via the combinations of electrospinning, in situ hydrothermal growth, and carbonization technique has been rationally constructed in this study. Zn x Co 3−x O 4 nanoparticles derived from metal−organic frameworks are uniformly loaded on the electrospun carbon nanofibers (CNFs) with high dispersion. Zn x Co 3−x O 4 /CNFs sorbents possess the highest breakthrough sulfur adsorption capacity (12.4 g S/100 g sorbent) and an excellent utilization rate of the active component (83.2%). The excellent performance of Zn x Co 3−x O 4 /CNFs can be attributed to the synergetic effect of the hierarchical structure and widely distributed Zn x Co 3−x O 4 on the CNFs supporter. The decomposition of Zn/Co−ZIFs not only generates the nucleus of oxides but also realizes their physical isolation through the formation of carbon grids on the surface of CNFs, avoiding the aggregation of oxides. Furthermore, Zn x Co 3−x O 4 /CNFs sorbents show an overwhelming superiority over the ZnO/CNFs sorbent, which is attributed to the introduction of Co and then the promotion of the stability of Zn at high temperatures. The presence of Co also accelerates the adsorption of H 2 S on the active site of the oxide surface. The presented method is beneficial for promoting desulfurization performances and producing sorbents with high utilization of active components.

show abstract

Section: Resultssupporting

confidence: 59%

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Zhang

et al. 2022

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Without photocatalysis, a maximum of 27.62% removal was observed due to adsorption alone. Gadisa et al (2020) [127] examined ZnO-carbon composite nanofibers for 30 mg/L caffeine removal. The study investigated different polymeric precursors (PAN, polystyrene (PS), and polyvinyl pyrrolidone (PVP)) for nanofiber synthesis via electrospinning to determine their effect on charge carrier properties, and they demonstrated that carbon doping efficiency varied with the precursors and determined their photocatalytic activities.…”

Section: Cec Removalmentioning

confidence: 99%

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

et al. 2021

View full text Add to dashboard Cite

In the past few decades, the role of nanotechnology has expanded into environmental remediation applications. In this regard, nanofibers have been reported for various applications in water treatment and air filtration. Nanofibers are fibers of polymeric origin with diameters in the nanometer to submicron range. Electrospinning has been the most widely used method to synthesize nanofibers with tunable properties such as high specific surface area, uniform pore size, and controlled hydrophobicity. These properties of nanofibers make them highly sought after as adsorbents, photocatalysts, electrode materials, and membranes. In this review article, a basic description of the electrospinning process is presented. Subsequently, the role of different operating parameters in the electrospinning process and precursor polymeric solution is reviewed with respect to their influence on nanofiber properties. Three key areas of nanofiber application for water treatment (desalination, heavy-metal removal, and contaminant of emerging concern (CEC) remediation) are explored. The latest research in these areas is critically reviewed. Nanofibers have shown promising results in the case of membrane distillation, reverse osmosis, and forward osmosis applications. For heavy-metal removal, nanofibers have been able to remove trace heavy metals due to the convenient incorporation of specific functional groups that show a high affinity for the target heavy metals. In the case of CECs, nanofibers have been utilized not only as adsorbents but also as materials to localize and immobilize the trace contaminants, making further degradation by photocatalytic and electrochemical processes more efficient. The key issues with nanofiber application in water treatment include the lack of studies that explore the role of the background water matrix in impacting the contaminant removal performance, regeneration, and recyclability of nanofibers. Furthermore, the end-of-life disposal of nanofibers needs to be explored. The availability of more such studies will facilitate the adoption of nanofibers for water treatment applications.

show abstract

“…S3 (ESI†) confirms the removal of organic compounds used for carbonization during the electrospinning process. 41,42…”

Section: Resultsmentioning

confidence: 99%

“…S3 (ESI †) confirms the removal of organic compounds used for carbonization during the electrospinning process. 41,42 Aiming at various photocatalytic applications, one of the important properties of photocatalysts is their optical absorption which can be monitored by employing UV-visible spectroscopy. C:ZnO nanostructures show a noticeable increase in visible-light absorption (Fig.…”

Section: Materials Advances Papermentioning

confidence: 99%

Crystal lattice engineering in a screw-dislocated ZnO nanocone photocatalyst by carbon doping

et al. 2022

View full text Add to dashboard Cite

show abstract

Tuning the charge carrier density and exciton pair separation in electrospun 1D ZnO-C composite nanofibers and its effect on photodegradation of emerging contaminants

Cited by 26 publications

References 62 publications

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

Crystal lattice engineering in a screw-dislocated ZnO nanocone photocatalyst by carbon doping

Contact Info

Product

Resources

About

Tuning the charge carrier density and exciton pair separation in electrospun 1D ZnO-C composite nanofibers and its effect on photodegradation of emerging contaminants

Cited by 26 publications

References 62 publications

Bimetallic-MOF-Derived ZnxCo3–xO4/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Bimetallic-MOF-Derived ZnxCo3–xO4/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Synthesis and Water Treatment Applications of Nanofibers by Electrospinning

Crystal lattice engineering in a screw-dislocated ZnO nanocone photocatalyst by carbon doping

Contact Info

Product

Resources

About

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization

Bimetallic-MOF-Derived Zn_xCo_3–xO₄/Carbon Nanofiber Composited Sorbents for High-Temperature Coal Gas Desulfurization