Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid

S. Khandaker, Takahiro Kuba, Y. Toyohara, S. Kamida, Y. Uchikawa

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

The surface chemistry and the structural properties of activated carbon can be altered by the acidic modification. The objective of this study is to investigate the changes occurring in bamboo charcoal (BC) during activation with concentrated nitric acid. Low temperature (500°C) carbonized BC has been prepared and oxidized with 70% concentrated boiling nitric acid (BC-AC). The porous properties of the BC are analyzed with nitrogen adsorption isotherm at 77 K. The surface structure is observed by Field emission scanning electronic microscope (FESEM) and the surface functional groups are examined by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and the pH of the point of zero charge (pHPZC). The results reveal that severe oxidation with HNO3 considerably decreases the surface area of BC with enhanced pore widening and FESEM observation demonstrates the erosive effect of oxidation. The FTIR analysis detects that some absorption bands are assigned for carboxyl, aldehyde and ketone groups on BC-AC. The XPS analysis also clearly shows that the ratio of oxygen and acidic functional groups has been enriched significantly on the BC-AC. The low pHPZC value of BC-AC confirms that the surface is highly acidic for the fixation of acidic functional groups on surface. In general, the existence of the abundant amount of acidic functional groups on adsorbents enhances the sorption of heavy metals ions in aqueous solution. Therefore, it is strongly expected that the modified BC, activated under the proposed conditions would be a promising ion exchanger in aqueous solution and can be applied for the adsorption of different heavy metal ions and radioactive materials from effluent.

Original languageEnglish
Article number012002
JournalIOP Conference Series: Earth and Environmental Science
Volume82
Issue number1
DOIs
Publication statusPublished - Aug 31 2017
Event3rd International Conference on Water Resource and Environment, WRE 2017 - Qingdao, China
Duration: Jun 26 2017Jun 29 2017

Fingerprint

bamboo
nitric acid
charcoal
ion exchange
functional group
X-ray spectroscopy
aqueous solution
heavy metal
adsorption
oxidation
ion
ketone
aldehyde
FTIR spectroscopy
Fourier transform
activated carbon
fixation
isotherm
sorption
surface area

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Development of ion-exchange properties of bamboo charcoal modified with concentrated nitric acid. / Khandaker, S.; Kuba, Takahiro; Toyohara, Y.; Kamida, S.; Uchikawa, Y.

In: IOP Conference Series: Earth and Environmental Science, Vol. 82, No. 1, 012002, 31.08.2017.

Research output: Contribution to journalConference article

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