Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (292 KB bytes)

Title: Adsorption mechanism of cadmium on juniper bark and wood

Author: Shin, Eun Woo; Karthikeyan, K. G.; Tshabalala, Mandla A.;

Date: 2007

Source: Bioresource technology. Vol. 98 (2007): pages 588-594.

Publication Series: Miscellaneous Publication

Description: In this study the capacity of sorbents prepared from juniper wood (JW) and bark (JB) to adsorb cadmium (Cd) from aqueous solutions at different pH values was compared. Adsorption behavior was characterized through adsorption kinetics, adsorption isotherms, and adsorption edge experiments. Results from kinetics and isotherm experiments showed that JB (76.3–91.6 lmol Cd g_1 substrate) had 3–4 times higher adsorption capacity for Cd than JW (24.8–28.3 lmol Cd g_1). In addition to higher capacity, JB exhibited a higher strength of adsorption (45.3 versus 9.1 L mmol_1) and faster uptake kinetics (0.0119 versus 0.0083 g lmol_1 min_1) compared to JW. For both these adsorbents, increasing Cd adsorption with increasing solution pH in the range of 2–6 suggests that surface carboxyl groups (RCOOH) might be involved in interaction with Cd. Diffuse reflectance infrared Fourier transform (DRIFT) spectra showed that the surface concentration of carboxyl groups was higher on JB compared to JW. The ratio of Ca released to Cd adsorbed was 1.04 and 0.78 for JB and JW, respectively, indicating that Ca–Cd ion-exchange was the primary mechanism involved. The higher Ca content in JB (15 times more) and the surface RCOOH concentration (2.5 times more) can be attributed to the observed differences in Cd adsorption behavior between the two lignocellulosic adsorbents.

Keywords: Bark, wood, lignocellulosic sorbents, cadmium, calcium, adsorption, ion- exchange, chemical kinetics, lignocellulose, metal ions, absorption, fourier transform infrared spectroscopy, water quality management, juniper, utilization, water pollution, heavy metals, carboxyl groups, kinetics, lignocellulosic fibers

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Shin, Eun Woo; Karthikeyan, K. G.; Tshabalala, Mandla A. 2007. Adsorption mechanism of cadmium on juniper bark and wood. Bioresource technology. Vol. 98 (2007): pages 588-594.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.