天宝岩4种湿地植被泥炭对Pb^(2+)的吸附特征  

Adsorption characteristics of Pb^(2+) on peat of four wetland vegetation types in the Tianbaoyan National Nature Reserve of Fujian

作　　者：李宁 潘辉[1,2] 李颖 刘进山 蔡昌棠 何东进 LI Ning;PAN Hui;LI Ying;LIU Jinshan;CAI Changtang;HE Dongjin(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Fujian Southern Forest Resources and Environmental Engineering Technology Research Center,Fuzhou,Fujian 350002,China;Fujian Tianbaoyan National Nature Reserve,Yong’an,Fujian 366032,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]福建省南方森林资源与环境工程技术研究中心,福建福州350002 [3]福建天宝岩国家级自然保护区,福建永安366032

出　　处：《森林与环境学报》2021年第5期449-455,共7页Journal of Forest and Environment

基　　金：国家自然科学基金项目(31370624,41301203);福建农林大学科技创新项目(KFA18123A);福建省自然科学基金项目(2008J0116,2011J01071)。

摘　　要：为探究湿地植被泥炭对Pb^(2+)的吸附特征,在福建天宝岩国家级自然保护区内,通过野外调查,探讨了泥炭投入量、吸附时间、p H值、Pb^(2+)浓度等因素对4种湿地植被(水竹、垂穗石松、灯芯草、泥炭藓)泥炭吸附Pb^(2+)性能的影响,并采用等温吸附模型(Langmuir模型、Freundlich模型)进行拟合,研究了4种湿地植被泥炭对Pb^(2+)的吸附特征。结果表明:4种湿地植被泥炭随着泥炭投入量的增加对Pb^(2+)吸附量均呈减少趋势,而对Pb^(2+)的吸附率均不断升高;随着吸附时间的延长,4种湿地植被泥炭对Pb^(2+)的吸附量均在吸附时间为30 min时达到最大值,随后呈缓慢减少的趋势;4种湿地植被泥炭吸附量均随Pb^(2+)浓度的升高而增加,但其吸附率变化趋势不一致;泥炭藓和灯芯草植被泥炭在p H值为6时,Pb^(2+)吸附量最大,分别为4.59和4.51 mg·g^(-1),水竹和垂穗石松植被泥炭在p H值为8时,Pb^(2+)吸附量最大,分别为4.72和4.97 mg·L^(-1);4种湿地植被泥炭吸附特征用Langmuir模型拟合效果更好,其中对垂穗石松植被泥炭拟合效果最好。To explore the characteristics of Pb^(2+) adsorption by wetland vegetation type peat in the Tianbaoyan National Nature Reserve,Fujian,field investigations of peat of Pllostachys heteroclada,Palhinhaea cernua,Juncus effuses,and Sphagnum magellanicum were performed.Based on basic indicators of the peat moss of the four wetland vegetation types,the effects of peat input,time,pH value,Pb^(2+) concentration,and other factors on the Pb^(2+) adsorption performance of the four wetland vegetation types were evaluated,and an isothermal adsorption model was developed.The method assessed the Pb^(2+) adsorption characteristics of the four types of peat.The results showed that the adsorption capacities of the four types of wetland vegetation peat decreased with increase of input and that the adsorption rates increased with increase of adsorption time.The adsorption capacities for Pb^(2+) of the four types of peat reached their maximum at 30 min.Furthermore,the adsorption capacities increased with increase of Pb^(2+) concentration.However,the change trends of adsorption rate were inconsistent.The adsorption capacities of S.magellanicum and J.effuses were 4.59 and 4.51 mg·L^(-1),respectively,at pH value=6,and the maximum adsorption capacities of Pllostachys heteroclada and Palhinhaea cernua were 4.72 and 4.97 mg·L^(-1),respectively,at pH value=8.The adsorption characteristics of the four peats were more consistent with the Langmuir model,and the fitting effect of Palhinhaea cernua peat was best.

关 键 词：泥炭 吸附特征 Pb^(2+) 天宝岩国家级自然保护区 

分 类 号：X703.1[环境科学与工程—环境工程]