Contribution of black carbon to nonlinearity of sorption and desorption of acetochlor on sediment
Contribution of black carbon to nonlinearity of sorption and desorption of acetochlor on sediment作者机构：Key Laboratory of Industrial Ecology and Environmental EngineeringMinistry of EducationSchool of Environmental and Biological Science and TechnologyDalian University of TechnologyDalian 116023China
出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)
年 卷 期：2009年第3卷第1期
页 面：69-74页
核心收录：
学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学]
主 题：black carbon(BC) sorption desorption sediment
摘 要：In order to investigate the contribution of various black carbon(BC)contents to nonlinearity of sorption and desorption isotherms for acetochlor on sediment,equilibrium sorption and desorption isotherms were determined to measure sorption and desorption of acetochlor in sediment amended with various amounts of *** this paper,two types of BC referred to as BC400 and BC500 were prepared at 400℃ and 500℃,*** preparation temperature facilitated the formation of micropores on BC to enhance its sorption *** of the BC content obviously increased the sorption amount and reduced the desorption amount for *** the BC500 contents in total organic carbon(TOC)increased from 0 to 60%,Freundlich sorption coefficient(K_(f))increased from 4.07 to 35.74,and desorption hysteresis became gradually *** the content of BC in TOC was lower than 23%,the sorption isotherm had a significant linear correlation(p=0.05).In case of desorption,a significant nonlinear change could be observed when the content of BC was up to 13%.Increase of BC content in the sediment would result in shifting the sorption-desorption isotherms from linearity to nonlinearity,which indicated that contribution of BC to nonlinear adsorption fraction became gradually remarkable.
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