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1、2016，35（5）:992-998农业环境科学学报2016年5月JournalofAgro-EnvironmentScience林宁，张晗，贾珍珍,等.不同生物质来源生物炭对Pb（Ⅱ）的吸附特性[J].农业环境科学学报,2016,35（5）：992-998.LINNing,ZHANGHan,JIAZhen-zhen,etal.AdsorptionofPb（Ⅱ）bybiocharsderivedfromthreetypesofbiomass[J].JournalofAgro-EnvironmentSc
2、ience,2016,35（5）:992-998.不同生物质来源生物炭对（）的吸附特性*林宁，张晗，贾珍珍，黄仁龙，舒月红（华南师范大学化学与环境学院，广州510006）摘要：以水稻秸秆、小麦秸秆、荔枝树枝为原料，在300、400、500、600℃下制备生物炭，并表征其理化性质，考察热解温度、初始pH、矿物组分等因素对生物炭吸附Pb（Ⅱ）的影响。结果表明，不同热解温度对水稻和小麦秸秆炭吸附Pb（Ⅱ）的影响很小，而荔枝树枝生物炭对Pb（Ⅱ）的吸附量随热解温度升高而显著增大。在pH3.0~6.0的范围内，
3、三种生物炭对溶液中Pb（Ⅱ）的吸附量呈上升趋势；在25℃时，三种生物炭的等温吸附曲线符合Freundlich吸附模型，荔枝树枝生物炭对Pb（Ⅱ）的吸附效果最佳。三种生物炭吸附Pb（Ⅱ）的主导机制可能是其与矿物组分的共沉淀作用，而荔枝树枝生物炭还可能存在Pb（Ⅱ）与-OH、-COOH之间的离子交换作用，C=C键中的π电子在吸附过程中也有一定的贡献。关键词：秸秆；荔枝树枝；生物炭；Pb（Ⅱ）；吸附中图分类号：X705文献标志码：A文章编号：1672-2043（2016）05-0992-07doi:10.1
4、1654/jaes.2016.05.025AdsorptionofPb（Ⅱ）bybiocharsderivedfromthreetypesofbiomassLINNing,ZHANGHan,JIAZhen-zhen,HUANGRen-long,SHUYue-hong*（SchoolofChemistryandEnvironment,SouthChinaNormalUniversity,Guangzhou510006,China）Abstract：Threedifferentrawmaterials,i
5、ncludingricestraw,wheatstraw,andlycheebranches,wereusedtoproducebiocharsbypyrolysisat300,400,500,and600℃.Thecharacteristicsofthebiocharsobtainedwereanalyzed.TheeffectsofbiocharpyrolysistemperatureandmineralcompositionandinitialsolutionpHonPb（Ⅱ）adsorptio
6、nbybiocharswereexamined.ResultsshowedthatpyrolysistemperatureexhibitednoobviousinfluenceonPb（Ⅱ）adsorptionbyriceandwheatstrawderivedbiochars,whiletheadsorptionofPb（Ⅱ）bylycheederivedbiocharincreasedwithincreasingpyrolysistemperature.AssolutionpHincreasedf
7、rom3.0to6.0,theamountofPb（Ⅱ）adsorbedonallbiocharsgraduallyincreased.AdsorptionisothermsofPb（Ⅱ）bythesebiocharsfittheFreundlichmodelwell.Inaddition,lychee-derivedbiocharshowedgreaterPb（Ⅱ）adsorptionthanthebiocharsderivedfromriceandwheatstraws.Chemicalpreci
8、pitationofPb（Ⅱ）withmineralcomponentsmightbethemainmechanismofPb（Ⅱ）adsorptionbythesebiochars.Lychee-derivedbiocharcontainedavarietyoffunctionalgroups,suchas-OH,-COOH,andC=C,thusprovidingdifferentadsorptionsites,includingaromatic-π
