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- Title
Comparison on Copper (II) Desorption from Loess Soil with and without Biochars Derived from Flax and Rape Straws.
- Authors
BAOWEI ZHAO; TINGTING SHANG; FENGFENG MA; LIJUAN YAN; LIPING HUANG
- Abstract
It has been reported that biochar is capable of adsorbing and immobilizing heavy metals in soils due to its prominent properties, such as the porous structure, large and charged surface, and functional groups on surface. The desorption of Cu (II) (Cu) from loess soil was studied and compared using batch washing method, with and without biochars derived from flax and rape straws. The effects of contact time, initial pH value of solution, temperature, initial concentration of Cu in soil, and co-existing Ca2+ on desorptions were investigated. The pseudo-second-order kinetic model could be used to describe the desorbing process well. The leaching ability (η) of Cu from solid phase increased in overly acidic solutions. Increasing temperature improved desorption of Cu from loess soil. When the initial concentration of Cu in soil increased, the η values of Cu decreased. Slight effect of Ca2+ on the η value of Cu was found. No significant immobilization of Cu by biochars was found because loess soil is much capable of holding Cu, possibly due to high content of carbonates. The results could provide references for immobilization remediation of loess soils contaminated with heavy metals using biochars as amendment.
- Subjects
BIOCHAR; COPPER in soils; FLAX
- Publication
Journal of Residuals Science & Technology, 2016, Vol 13, Issue 2, p81
- ISSN
1544-8053
- Publication type
Article
- DOI
10.12783/issn.1544-8053/13/2/1