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浙江大学学报（农业与生命科学版）
浙江大学学报(农业与生命科学版)  2012, Vol. 38 Issue (1): 91-97    DOI: 10.3785/j.issn.1008-9209.2012.01.011
资源与环境科学     
不同初始磷浓度下湖泊沉积物对磷吸附的动力学特征
黄利东,柴如山,宗晓波,章永松
浙江大学环境与资源学院教育部环境修复与生态健康重点实验室/浙江省亚热带土壤与植物营养重点实验室,浙江杭州３１００５８
Characteristics of phosphorus sorption kinetics on sediments at different initial phosphorus concentrations
HUANG  Li dong,CHAI Ru shan,ZONG Xiao bo,ZHANG Yong song
M inistry o f Education Key Laboratory o f Env ironmental Remediation and Ecosystem Health / Zhe j iang Prov incial Key Laboratory o f Subtropical Soil and Plant Nutrition , College o f Env ironmental and Resource Sciences ,Zhejiang University , H angz hou 310058 , China
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摘要： 通过选取自然湖泊梅梁湾和人工湖泊华家池２ 个湖泊的沉积物,研究不同初始磷浓度( C０ )对沉积物磷吸附动力学的影响以及２ 种沉积物磷吸附动力学的类型.结果表明:１)梅梁湾沉积物对磷的吸附量大,吸附过程明显分为快、慢吸附２ 个阶段,华家池沉积物对磷的吸附过程较慢且吸附量小;２)梅梁湾与华家池沉积物零净吸附磷浓度(EPC０ )分别为0.03 和0.42mg.L -１ ,当C０ ＜ EPC０ 时,沉积物解吸磷,反之则吸附磷;３)经过模型理论基础、标准残差和决定系数的比较得出,梅梁湾与华家池沉积物对磷的吸附分别属于假二级和假一级动力学模型;４)随着磷初始浓度的升高,沉积物的磷吸附量增加,磷吸附速率加快,同时需要更长的时间达到平衡;通过分析吸附动力学参数与初始浓度的关系,分别得到了梅梁湾与华家池沉积物磷吸附量与初始浓度和吸附时间的经验方程,这２ 个方程可以用来预测不同磷浓度和不同时间段条件下２ 种沉积物对磷的吸附过程.
Abstract: Two different sediments ( Meiliangwan and Huajiachi) were selected to study the effect of initial P concentration ( C０ ) on P sorption kinetics and to identify the corresponding sorption kinetic type . Kinetics studies were carried out using an agitated batch method . The kinetics of sorption were followed based on the amounts of P adsorbed at various time intervals . The data were analyzed using pseudo‐first order and pseudo‐second order equations . The results showed that : １) for the Meiliangwan sediment ,the process belonged to a two‐stage dynamic : an initial fast exchange of P followed by a much slower process , and its sorption quantity was much larger than that of the Huajiachi sediment , which could be seen as chemical sorption . For the Huajiachi sediment , the sorption process was slow and had a small
absorbing capacity , which belonged to physical sorption , and the data points fluctuated greatly ; ２) the zero equilibrium P concentration (EPC０ ) in the Meiliangwan and Huajiachi sediments was ０.０３ and ０.４２mg.L -1 , respectively . When C０ ＜ EPC０ , the sediment desorbed P , or else the sediment adsorbed P ;３) the sorption data in the Meiliangwan and Huajiachi sediment followed pseudo‐second order and pseudo‐first order kinetic model respectively by investigating the theoretical criteria and comparing standard residual error and correlation coefficient ; ４) the sorption quantity and sorption rate of sediments increased with increasing C０ . Besides , the higher the C０ value was , the longer time was required to achieve equilibrium . From the relationship between C０ and kinetic parameters , generalized predictive models for P adsorbed onto sediments at any contact time and initial P concentration within the given range were proposed . These equations could then be used to derive the amount of P adsorbed at any givenion concentration and the reaction time . It will be helpful to understand the P transfer differences between sediments .
出版日期: 2012-01-20
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黄利东
柴如山
宗晓波
章永松

引用本文:

黄利东,柴如山,宗晓波,章永松. 不同初始磷浓度下湖泊沉积物对磷吸附的动力学特征[J]. 浙江大学学报(农业与生命科学版), 2012, 38(1): 91-97.

HUANG Li dong,CHAI Ru shan,ZONG Xiao bo,ZHANG Yong song. Characteristics of phosphorus sorption kinetics on sediments at different initial phosphorus concentrations. , 2012, 38(1): 91-97.

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http://www.zjujournals.com/agr/CN/10.3785/j.issn.1008-9209.2012.01.011    或    http://www.zjujournals.com/agr/CN/Y2012/V38/I1/91

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