TY - JOUR
T1 - Characterization of Cr(VI) binding and reduction to Cr(III) by the agricultural byproducts of Avena monida (Oat) biomass
AU - Gardea-Torresdey, J. L.
AU - Tiemann, K. J.
AU - Armendariz, V.
AU - Bess-Oberto, L.
AU - Chianelli, R. R.
AU - Rios, J.
AU - Parsons, J. G.
AU - Gamez, G.
N1 - Funding Information:
The authors acknowledge the financial support from the Center for Environmental Resource Management (CERM) at University of Texas at El Paso through funding from the HBCU/MI Environmental Technology Consortium, which is funded by the Department of Energy and the Office of Exploratory Research of the US Environmental Protection Agency (cooperative agreement CR-819849-01-4). Also, J.L. Gardea-Torresdey acknowledges the financial support form the National Institutes of Health (Grant GM08012-25) and the BEST Program, Department of Defense, Army Corps of Engineers. The authors also would like to acknowledge the Stanford Synchrotron Radiation Laboratory (SSRL) along with G. George and I. Pickering for their help with the X-ray absorption work, and the financial support of the Model Institute for Excellence (MIE) at UTEP. Judith Rios also acknowledges the Consejo Nacional de Ciencia y Tecnologı́a (CONACYT) of Mexico for its financial support (Grant #116647). Also, to the Distrito de Desarrollo Rural 04 Valle de Juárez (SAGAR) of Mexico for the information provided; to the Rancho Escuela of the Universidad Autónoma de Cd. Juárez for the information and samples and to Ms. Vicky Castro for the oat samples provided. We also acknowledge the support of General Electric Faculty for the Future Program.
PY - 2000/12/30
Y1 - 2000/12/30
N2 - Chromium contamination of the environment has become an important issue due to the potential health threat it poses. Conventional technologies to clean up heavy metal ions from contaminated waters have been utilized, but these technologies are not cost-effective. However, the use of agricultural waste byproducts for the removal of Cr(VI) from contaminated waters may be a new cost-effective alternative. Oat byproducts from the Juarez Valley in Mexico were studied for the ability to bind Cr(VI) under different temperature and time conditions. The metal binding ability of oat byproducts was calculated from experimental data collected at temperatures of 8, 26, and 54 °C, and time exposures of 1, 6, 24, 48, and 72 h at each temperature. These results showed that the binding of Cr(VI) to oat biomass increased as time and temperature increased. The bound chromium was recovered from the oat biomass by treatment with 0.2 M HCl. Through the use of X-ray absorption spectroscopy, the reduction of Cr(VI) to Cr(III) was determined to occur by the oat byproducts. These results indicate that the use of agricultural waste byproducts could be a better alternative for the removal and subsequent reduction of Cr(VI) to Cr(III) from contaminated waters.
AB - Chromium contamination of the environment has become an important issue due to the potential health threat it poses. Conventional technologies to clean up heavy metal ions from contaminated waters have been utilized, but these technologies are not cost-effective. However, the use of agricultural waste byproducts for the removal of Cr(VI) from contaminated waters may be a new cost-effective alternative. Oat byproducts from the Juarez Valley in Mexico were studied for the ability to bind Cr(VI) under different temperature and time conditions. The metal binding ability of oat byproducts was calculated from experimental data collected at temperatures of 8, 26, and 54 °C, and time exposures of 1, 6, 24, 48, and 72 h at each temperature. These results showed that the binding of Cr(VI) to oat biomass increased as time and temperature increased. The bound chromium was recovered from the oat biomass by treatment with 0.2 M HCl. Through the use of X-ray absorption spectroscopy, the reduction of Cr(VI) to Cr(III) was determined to occur by the oat byproducts. These results indicate that the use of agricultural waste byproducts could be a better alternative for the removal and subsequent reduction of Cr(VI) to Cr(III) from contaminated waters.
KW - Agricultural byproducts
KW - Bioreduction
KW - Chromium(VI)
KW - EXAFS
KW - Oat
KW - XANES
UR - http://www.scopus.com/inward/record.url?scp=0034736594&partnerID=8YFLogxK
U2 - 10.1016/S0304-3894(00)00301-0
DO - 10.1016/S0304-3894(00)00301-0
M3 - Article
C2 - 11080577
AN - SCOPUS:0034736594
SN - 0304-3894
VL - 80
SP - 175
EP - 188
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -