Pedosphere 25(5): 781--789, 2015
ISSN 1002-0160/CN 32-1315/P
©2015 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Rice straw-derived biochar properties and functions as Cu(II) and cyromazine sorbents as influenced by pyrolysis temperature |
JIANG Jun1,2, Y. B. PENG2, YUAN Min1,3,
HONG Zhi-Neng1, WANG De-Jian1 and XU Ren-Kou1 |
1State Key Laboratory of Soil and Sustainable
Agriculture, Institute of Soil Science, Chinese Academy of
Sciences, Nanjing 210008
(China)
2Indiana University, 1001 E 10th St. Bloomington,
Indiana 47405 (USA)
3Jiangsu Entry-Exit Inspection and Quarantine Bureau,
Nanjing 210001 (China) |
| ABSTRACT |
| In this study, biochars from rice straw ( Oryza sativa L.)
were prepared at 200--600 oC by oxygen-limited pyrolysis to
investigate the changes in properties of rice straw biochars produced at different
temperatures, and to examine the adsorption capacities of
the biochars for a heavy metal, copper(II) (Cu(II)), and an organic
insecticide of cyromazine, as well as to further reveal the
adsorption mechanisms. The results obtained with batch
experiments showed that the amount of Cu(II) adsorbed
varied with the pyrolysis temperatures of rice straw
biochar. The biochar produced at 400 oC had the
largest adsorption capacity for Cu(II) (0.37 mol kg-1)
among the biochars, with the non-electrostatic adsorption
as the main adsorption mechanism. The highest adsorption
capacity for cyromazine (156.42 g kg-1) was found in
the rice straw biochar produced at 600 oC, and
cyromazine adsorption was exclusively predominated by
surface adsorption. An obvious competitive adsorption was
found between 5 mmol L-1 Cu(II) and 2 g L-1
cyromazine when they were in the binary solute system.
Biochar may be used to remediate heavy metal- and organic
insecticide-contaminated water, while the pyrolysis
temperature of feedstocks for producing biochar should be
considered for the restoration of multi-contamination. |
| Key Words: adsorption capacity, adsorption mechanism,
desorption, heavy metal, multi-contaminated water, non-electrostatic
adsorption, organic insecticide, surface charg |
| Citation: Jiang, J., Peng, Y. B., Yuan, M., Hong, Z. N., Wang, D. J. and Xu, R. K. 2015. Rice straw-derived biochar properties and functions as Cu(II) and cyromazine sorbents as influenced by pyrolysis temperature. Pedosphere. 25(5): 781-789. |
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