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1、现代食品科技ModernFoodScienceandTechnology2014,Vol.30,No.10新型生物质炭吸附剂对地下水中氟的去除作用张瑞玲,李德生,秦松岩,王亮,周雅楠,文桦,何安(天津理工大学环境科学与安全工程学院,天津300384)摘要:本文选用花生壳、栗子壳、核桃壳、橘子皮等生物质原料在不同温度下制备得生物质炭。通过对不同条件制备的生物质炭的除氟效果的比较,结果发现,以花生壳为原料在650℃热解所得生物质炭除氟效果最好。并对花生壳生物质炭进行了表面结构表征。在此基础上,研究了
2、吸附时间、生物质炭投加量、pH值、氟离子初始浓度等因素对花生壳生物质炭除氟效果的影响。结果表明,最佳炭投加量为1g/100mL,最佳pH为5.5~6,吸附60min左右达吸附平衡,此时去除率达到82.25%,吸附量容量达0.82mg/g;随着氟离子初始浓度的增加生物质炭对氟的去除率成下降趋势,吸附容量随含氟量浓度的增加成上升趋势。花生壳生物质炭对氟离子的吸附等温线模拟结果表明,Freundlich型和Langmuir型均较为符合。该花生壳生物质炭对地下水氟的最大吸附容量为1.11mg/g。该研究
3、为农业废弃物资源化利用以及地下水氟污染治理提供了一条新的思路。关键词:生物质炭;地下水;除氟;影响因素文章篇号:1673-9078(2014)10-159-164DOI:10.13982/j.mfst.1673-9078.2014.10.027RemovalofFluoridefromGroundwaterUsingNewBiocharAdsorbentsZHANGRui-ling,LIDe-sheng,QINSong-yan,WANGLiang,ZHOUYa-nan,WENHua,HEAn(S
4、choolofEnvironmentalScienceandSafetyEngineering,TianjinUniversityofTechnology,Tianjin300384,China)Abstract:Inthisstudy,newbiocharadsorbentswerefirstpreparedfromthepeanutshell,chestnutshell,walnutshell,andorangepeelunderdifferentpyrolysistemperatures,
5、andthenthefluorideremovaleffectsofthesenewbiocharadsorbentswerecompared.Theresultsshowedthatthebiocharderivedfromthepeanutshellwithpyrolysisat650℃providedthebestdefluoridationeffect.Thesurfacestructureofthepeanutshell-derivedbiocharwasthencharacteriz
6、edandtheeffectsoffactorssuchastheadsorptionequilibriumtime,dosageofbiochar,pHvalue,andinitialconcentrationoffluorideionsonthedefluoridationofthepeanutshell-derivedbiocharwereinvestigated.Theresultsindicatedthattheoptimumdosageofthebiocharwas1g/100mL,
7、theoptimumpHwasapproximately5.5~6,theadsorptionequilibriumwasattainedafterapproximately60minwhentheremovalratewas82.25%,andthattheadsorptioncapacitywas0.82mg/g.Withanincreasinginitialconcentrationoffluoride,thefluorideremovalrateshowedadecliningtrend
8、.However,theadsorptioncapacityshowedanincreasingtrendwithincreasingfluorideconcentration.Thesimulatedresultsoftheadsorptionisothermoffluorideonthepeanutshell-derivedbiocharindicatedthattheexperimentaldatafittedwellwithboththeLangmuirandFreundlichmode