生物炭对水中五氯酚的吸附性能研究

中国环境科学2014，34(8)：2017-2023ChinaEnvironmentalScience生物炭对水中五氯酚的吸附性能研究郎印海，刘伟，王慧(中国海洋大学环境科学与工程学院，海洋环境与生态教育部重点实验室，山东青岛266100)摘要：利用小麦秸秆和花生壳在300，400，600C条件下制备生物炭，运用元素分析仪、扫描电镜和比表面积仪对生物炭的理化性质进行表征，同时探讨其对水中五氯酚(PCP)的吸附特性．结果表明，随炭化温度升高，生物炭芳香性增加，极性降低．花生壳生物炭对水中PCP的吸附效果优于小麦秸秆生物炭，3种温度制备的生物炭对PCP吸附量表现为400C>600~C>300~C．随着生物炭添加量增大，水中PCP去除能力由81．79％提高至89．02％，生物炭的吸附量由30．32减小至5．54m~g．生物炭对PCP的吸附动力学更符合准二级动力学方程，吸附等温线符合Freundlich方程．吸附过程主要受快速反应控制，降低反应温度有利于生物炭对水中PCP的吸附．关键词：生物炭：花生壳；小麦秸秆；五氯酚：吸附中图分类号：X703．1文献标识码：A文章编号：1000—6923(2014)08—2017—07Adsorptioneffieieneiesofpentaehlorophenoifromaqueoussolutionontobiochars．LANGYin—hai。，LIUWei，WANGHui(KeyLaboratoryofMarineEnvironmentalScienceandEcology,MinistryofEducation，CollegeofEnvironmentalScienceandEngineering，OceanUniversityofChina,Qingdao266100，China)．ChinaEnvironmentalScience，2014，34(8)：2017~2023Abstract：Thebiocharswereproducedfromwheatstrawandpeanuthullatthreepyrolysistemperaturesof300，400and600~C，respectively．Thephysico—chemicalpropertiesofbiocharswerecharacterizedbyelementalanalyzer,scanningelectronmicroscopeandBETsurfaceareaanalyzer,andtheadsorptioncapabilityofbiocharsfortheremovalofpentachlorophenol(PCP)fromaqueoussolutionwasevaluated．Theresultsshowedthatthearomaticityofbiocharsgraduallyincreasedandthepolaritydecreasedwiththeincreasingpyrolysistemperature．Theadsorptioncapabilityofpeanuthullbiocharswashigherthanthatofwheatstrawbiochars．Inaddition，theadsorptionamountofpeanuthullandwheatstrawbiocharsunderdiferentcarbonizationtemperaturefollowedtheorderof400~C>600C>300C．TheremovalcapacityforPCPincreasedfrom81．79％to89．02％withbiochardosagesincrease，whiletheadsorptionamountofbiocharsdecreasedfrom30．32to5．54mg／g．TheadsorptionkineticsandisothermsofPCPontobiocharswerebetterfiredbypseudo-second—orderkineticandFreundlichequation，respectively．ThefastadsorptionreactionwasthecontrolledprocessandlowertemperatureenhancedtheadsorptionofPCPfromaqueoussolution．Keywords：biochar；wheatstraw．peanuthull；pentachlorophenol；adsorption五氯酚(PCP)有稳定的环状分子结构，具有毒性和致癌性，是环境优先检测污染物之一】