Acid activated bamboo-type carbon nanotubes and cup-stacked-type carbon nanostructures as adsorbent materials: Cadmium removal from water

G. Andrade-Espinosa, J. R. Rangel-Mendez, E. Muñoz-Sandoval, H. Terrones, Mauricio Terrones Maldonado

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Considerable amounts of heavy metals have been discharged to the environment since the beginning of the industrialization. Consequently, the concentration of toxic metals in rivers, lakes and oceans has increased notably. Cadmium, arsenic, copper, zinc, lead and other metals have been listed by the USEPA as the most common contaminants in wastewaters. Cadmium, in particular, has been identified as one of the most toxic contaminants that causes severs health problems to human beings, and harms flora and fauna. A wide variety of adsorbents materials, such as activated carbons, clays, zeolites, etc., have been utilized to remove heavy metals from aqueous solutions, although in recent years nanostructured materials have taken special attention due to their excellent physicochemical characteristics such as high surface area and strength, and have already had an ample application in electronic devices and composite materials. The applications of carbon nanostructures as adsorbent materials of contaminants present in solution have just begun to be explored; and recent reported results appear very promising despite the fact that these materials are not yet produced in large amounts. In this investigation bambootype carbon nanotubes and cup-stacked-type carbon nanostructures were modified with nitric acid at boiling point (about 84 °C) for one to three hours. The carbon nanostructures were characterized before and after oxidation by SEM, EDX, FTIR, and acid/base titration. Plus cadmium adsorption experiments were carried out at an initial concentration of 60 mg/L, 25 °C and pH 6 in batch reactors. Preliminary results have shown that the three hours oxidized carbon nanostructures have less Fe (catalyst) and the oxygen content increased about 2%, which was also reflected in a high amount of acid sites (about 2 mmol/g). These last findings were also supported by FTIR; treated materials showed more accentuated energy absorption peaks at wavelengths between 1750 and 1700 cm-1, which is attributed to higher concentration of carboxylic acids (COOH). Untreated and oxidized carbon nanostructures adsorbed about 2 and 14 mg of cadmium per g of material, respectively, which demonstrates that the introduction of oxygen-containing surface groups in the nanostructures enhanced the adsorption capacity. These preliminary findings indicate that the modified nanostructure materials studied herein have a potential application in the removal of contaminants and/or recovery of precious metals present in aqueous phase.

Original languageEnglish (US)
Title of host publication2006 AIChE Annual Meeting
StatePublished - Dec 1 2006
Event2006 AIChE Annual Meeting - San Francisco, CA, United States
Duration: Nov 12 2006Nov 17 2006

Publication series

NameAIChE Annual Meeting, Conference Proceedings

Other

Other2006 AIChE Annual Meeting
CountryUnited States
CitySan Francisco, CA
Period11/12/0611/17/06

Fingerprint

Carbon Nanotubes
Bamboo
Cadmium
Adsorbents
Nanostructures
Carbon nanotubes
Carbon
Acids
Water
Impurities
Poisons
Heavy Metals
Heavy metals
Metals
Oxygen
Zeolites
Adsorption
Nitric Acid
Boiling point
Energy absorption

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

Andrade-Espinosa, G., Rangel-Mendez, J. R., Muñoz-Sandoval, E., Terrones, H., & Terrones Maldonado, M. (2006). Acid activated bamboo-type carbon nanotubes and cup-stacked-type carbon nanostructures as adsorbent materials: Cadmium removal from water. In 2006 AIChE Annual Meeting (AIChE Annual Meeting, Conference Proceedings).
Andrade-Espinosa, G. ; Rangel-Mendez, J. R. ; Muñoz-Sandoval, E. ; Terrones, H. ; Terrones Maldonado, Mauricio. / Acid activated bamboo-type carbon nanotubes and cup-stacked-type carbon nanostructures as adsorbent materials : Cadmium removal from water. 2006 AIChE Annual Meeting. 2006. (AIChE Annual Meeting, Conference Proceedings).
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Andrade-Espinosa, G, Rangel-Mendez, JR, Muñoz-Sandoval, E, Terrones, H & Terrones Maldonado, M 2006, Acid activated bamboo-type carbon nanotubes and cup-stacked-type carbon nanostructures as adsorbent materials: Cadmium removal from water. in 2006 AIChE Annual Meeting. AIChE Annual Meeting, Conference Proceedings, 2006 AIChE Annual Meeting, San Francisco, CA, United States, 11/12/06.

Acid activated bamboo-type carbon nanotubes and cup-stacked-type carbon nanostructures as adsorbent materials : Cadmium removal from water. / Andrade-Espinosa, G.; Rangel-Mendez, J. R.; Muñoz-Sandoval, E.; Terrones, H.; Terrones Maldonado, Mauricio.

2006 AIChE Annual Meeting. 2006. (AIChE Annual Meeting, Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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T2 - Cadmium removal from water

AU - Andrade-Espinosa, G.

AU - Rangel-Mendez, J. R.

AU - Muñoz-Sandoval, E.

AU - Terrones, H.

AU - Terrones Maldonado, Mauricio

PY - 2006/12/1

Y1 - 2006/12/1

N2 - Considerable amounts of heavy metals have been discharged to the environment since the beginning of the industrialization. Consequently, the concentration of toxic metals in rivers, lakes and oceans has increased notably. Cadmium, arsenic, copper, zinc, lead and other metals have been listed by the USEPA as the most common contaminants in wastewaters. Cadmium, in particular, has been identified as one of the most toxic contaminants that causes severs health problems to human beings, and harms flora and fauna. A wide variety of adsorbents materials, such as activated carbons, clays, zeolites, etc., have been utilized to remove heavy metals from aqueous solutions, although in recent years nanostructured materials have taken special attention due to their excellent physicochemical characteristics such as high surface area and strength, and have already had an ample application in electronic devices and composite materials. The applications of carbon nanostructures as adsorbent materials of contaminants present in solution have just begun to be explored; and recent reported results appear very promising despite the fact that these materials are not yet produced in large amounts. In this investigation bambootype carbon nanotubes and cup-stacked-type carbon nanostructures were modified with nitric acid at boiling point (about 84 °C) for one to three hours. The carbon nanostructures were characterized before and after oxidation by SEM, EDX, FTIR, and acid/base titration. Plus cadmium adsorption experiments were carried out at an initial concentration of 60 mg/L, 25 °C and pH 6 in batch reactors. Preliminary results have shown that the three hours oxidized carbon nanostructures have less Fe (catalyst) and the oxygen content increased about 2%, which was also reflected in a high amount of acid sites (about 2 mmol/g). These last findings were also supported by FTIR; treated materials showed more accentuated energy absorption peaks at wavelengths between 1750 and 1700 cm-1, which is attributed to higher concentration of carboxylic acids (COOH). Untreated and oxidized carbon nanostructures adsorbed about 2 and 14 mg of cadmium per g of material, respectively, which demonstrates that the introduction of oxygen-containing surface groups in the nanostructures enhanced the adsorption capacity. These preliminary findings indicate that the modified nanostructure materials studied herein have a potential application in the removal of contaminants and/or recovery of precious metals present in aqueous phase.

AB - Considerable amounts of heavy metals have been discharged to the environment since the beginning of the industrialization. Consequently, the concentration of toxic metals in rivers, lakes and oceans has increased notably. Cadmium, arsenic, copper, zinc, lead and other metals have been listed by the USEPA as the most common contaminants in wastewaters. Cadmium, in particular, has been identified as one of the most toxic contaminants that causes severs health problems to human beings, and harms flora and fauna. A wide variety of adsorbents materials, such as activated carbons, clays, zeolites, etc., have been utilized to remove heavy metals from aqueous solutions, although in recent years nanostructured materials have taken special attention due to their excellent physicochemical characteristics such as high surface area and strength, and have already had an ample application in electronic devices and composite materials. The applications of carbon nanostructures as adsorbent materials of contaminants present in solution have just begun to be explored; and recent reported results appear very promising despite the fact that these materials are not yet produced in large amounts. In this investigation bambootype carbon nanotubes and cup-stacked-type carbon nanostructures were modified with nitric acid at boiling point (about 84 °C) for one to three hours. The carbon nanostructures were characterized before and after oxidation by SEM, EDX, FTIR, and acid/base titration. Plus cadmium adsorption experiments were carried out at an initial concentration of 60 mg/L, 25 °C and pH 6 in batch reactors. Preliminary results have shown that the three hours oxidized carbon nanostructures have less Fe (catalyst) and the oxygen content increased about 2%, which was also reflected in a high amount of acid sites (about 2 mmol/g). These last findings were also supported by FTIR; treated materials showed more accentuated energy absorption peaks at wavelengths between 1750 and 1700 cm-1, which is attributed to higher concentration of carboxylic acids (COOH). Untreated and oxidized carbon nanostructures adsorbed about 2 and 14 mg of cadmium per g of material, respectively, which demonstrates that the introduction of oxygen-containing surface groups in the nanostructures enhanced the adsorption capacity. These preliminary findings indicate that the modified nanostructure materials studied herein have a potential application in the removal of contaminants and/or recovery of precious metals present in aqueous phase.

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Andrade-Espinosa G, Rangel-Mendez JR, Muñoz-Sandoval E, Terrones H, Terrones Maldonado M. Acid activated bamboo-type carbon nanotubes and cup-stacked-type carbon nanostructures as adsorbent materials: Cadmium removal from water. In 2006 AIChE Annual Meeting. 2006. (AIChE Annual Meeting, Conference Proceedings).