Novel carbon micro fibers and foams from waste printed circuit boards

R. Khanna, M. Ikram-Ul-Haq, R. Cayumil, R. Rajarao, V. Sahajwalla

Resultado de la investigación: Article

10 Citas (Scopus)

Resumen

Abstract We report the generation of novel carbon micro fibers and foam structures during the pyrolysis of polymer rich waste printed circuit boards (PCBs) in the temperature range of 750 °C to 1550 °C under argon atmosphere. Following initial polymer degradation and the separation of most of the metallic phase, the carbonaceous residue was seen to evolve into a variety of structures. Carbon fibers started to nucleate ~ 1150 °C, had a thickness ranging between 2 and 10 microns, contained up to 95% C with morphologies ranging between tubular, foamy network and fibrous. The chemical compositions of these carbon structures was determined through X-ray microanalysis; the carbon content was close to 90% along with 5-7% oxygen, traces of phosphorus, antimony, tin and copper. The transformation of carbon fibers to a well-defined foam structure was observed at 1250 °C; these structures were found to be stable even at higher temperatures. The formation of carbon foams/fibers was found to be not very sensitive to the relative concentration of oxide impurities present. This study shows that a potentially vast source of carbon could be recovered from the non-metallic fraction of e-waste for applications such as reduction reactions, carburization, metal-carbon composites or as a source of fuel and energy.

Idioma originalEnglish
Número de artículo4478
Páginas (desde-hasta)473-479
Número de páginas7
PublicaciónFuel Processing Technology
Volumen134
DOI
EstadoPublished - 1 ene 2015

Huella dactilar

Printed circuit boards
Foams
Carbon
Fibers
Carbon fibers
Polymers
Antimony
Tin
Argon
Microanalysis
Phosphorus
Oxides
Copper
Pyrolysis
Metals
Impurities
Oxygen
Degradation
X rays
Temperature

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Chemical Engineering(all)

Citar esto

Khanna, R. ; Ikram-Ul-Haq, M. ; Cayumil, R. ; Rajarao, R. ; Sahajwalla, V. / Novel carbon micro fibers and foams from waste printed circuit boards. En: Fuel Processing Technology. 2015 ; Vol. 134. pp. 473-479.
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Novel carbon micro fibers and foams from waste printed circuit boards. / Khanna, R.; Ikram-Ul-Haq, M.; Cayumil, R.; Rajarao, R.; Sahajwalla, V.

En: Fuel Processing Technology, Vol. 134, 4478, 01.01.2015, p. 473-479.

Resultado de la investigación: Article

TY - JOUR

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AU - Ikram-Ul-Haq, M.

AU - Cayumil, R.

AU - Rajarao, R.

AU - Sahajwalla, V.

PY - 2015/1/1

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N2 - Abstract We report the generation of novel carbon micro fibers and foam structures during the pyrolysis of polymer rich waste printed circuit boards (PCBs) in the temperature range of 750 °C to 1550 °C under argon atmosphere. Following initial polymer degradation and the separation of most of the metallic phase, the carbonaceous residue was seen to evolve into a variety of structures. Carbon fibers started to nucleate ~ 1150 °C, had a thickness ranging between 2 and 10 microns, contained up to 95% C with morphologies ranging between tubular, foamy network and fibrous. The chemical compositions of these carbon structures was determined through X-ray microanalysis; the carbon content was close to 90% along with 5-7% oxygen, traces of phosphorus, antimony, tin and copper. The transformation of carbon fibers to a well-defined foam structure was observed at 1250 °C; these structures were found to be stable even at higher temperatures. The formation of carbon foams/fibers was found to be not very sensitive to the relative concentration of oxide impurities present. This study shows that a potentially vast source of carbon could be recovered from the non-metallic fraction of e-waste for applications such as reduction reactions, carburization, metal-carbon composites or as a source of fuel and energy.

AB - Abstract We report the generation of novel carbon micro fibers and foam structures during the pyrolysis of polymer rich waste printed circuit boards (PCBs) in the temperature range of 750 °C to 1550 °C under argon atmosphere. Following initial polymer degradation and the separation of most of the metallic phase, the carbonaceous residue was seen to evolve into a variety of structures. Carbon fibers started to nucleate ~ 1150 °C, had a thickness ranging between 2 and 10 microns, contained up to 95% C with morphologies ranging between tubular, foamy network and fibrous. The chemical compositions of these carbon structures was determined through X-ray microanalysis; the carbon content was close to 90% along with 5-7% oxygen, traces of phosphorus, antimony, tin and copper. The transformation of carbon fibers to a well-defined foam structure was observed at 1250 °C; these structures were found to be stable even at higher temperatures. The formation of carbon foams/fibers was found to be not very sensitive to the relative concentration of oxide impurities present. This study shows that a potentially vast source of carbon could be recovered from the non-metallic fraction of e-waste for applications such as reduction reactions, carburization, metal-carbon composites or as a source of fuel and energy.

KW - Carbon fibers

KW - Carbon foams

KW - Carbon resource

KW - Material recovery

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