Effect of lead on the sorption of 2,4,6-trichlorophenol on soil and peat.
The effect of lead on the sorption of 2,4,6-trichlorophenol (2,4,6-TCP) on soil and peat was investigated using a batch equilibration method. Lead markedly diminished the sorption of 2,4,6-TCP, and 2,4,6-TCP had little effect on lead sorption. Peat was a more effective adsorbent for 2,4,6-TCP than soil. The desorption hysteresis of 2,4,6-TCP verified the presence of high-energy sorption sites. Mechanisms of lead suppression effect on the 2,4,6-TCP sorption included the following: Firstly, lead accelerated the aggregation of colloids, the aggregates covered the surface in part and shrunk the pore sizes of the adsorbents, hence decreased the sorption of 2,4,6-TCP. Secondly, X-ray absorption and Fourier transform infrared spectroscopy study suggested that lead competed with 2,4,6-TCP for carboxylic, phenolic and Si-OH groups of organic matter and clay minerals. Such competition was partly responsible for the overall suppression effect of lead on the sorption of 2,4,6-TCP.
Pei
Zhi-Guo
ZG
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
Shan
Xiao-Quan
XQ
Liu
Tao
T
Xie
Ya-Ning
YN
Wen
Bei
B
Zhang
Shuzhen
S
Khan
Shahamat U
SU
D000327:Adsorption; D002733:Chlorophenols / Q000737:chemistry* / Q000633:toxicity; D003102:Colloids / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000633:toxicity*; D009153:Mutagens / Q000737:chemistry / Q000633:toxicity; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000633:toxicity*; D013052:Spectrometry, X-Ray Emission / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods
D002733:Chlorophenols; D003102:Colloids; D009153:Mutagens; D012987:Soil; D012989:Soil Pollutants; D007854:Lead; C024564:2,4,6-trichlorophenol