改性花生殼對水中鉻鉛的吸附作用

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1、農業(yè)環(huán)境科學學報2011,30(7):1404-1408JournalofAgro-EnvironmentScience改性花生殼對水中Cd2+和Pb2+的吸附研究11，2*1，21林芳芳，易筱筠，黨志，鄭劉春（1.華南理工大學環(huán)境科學與工程學院，廣州510006；2.工業(yè)聚集區(qū)污染控制與生態(tài)修復教育部重點實驗室，廣州510006）摘要：用高錳酸鉀對花生殼進行改性，制成改性花生殼吸附材料，并進一步就該吸附劑對水中重金屬離子Pb2+、Cd2+的吸附去除性能進行了考察，結果表明，吸附在18h后基本達到平衡，吸附P

2、b2+和Cd2+最佳初始pH值分別為4.5和6.5，對Pb2+的吸附量最大達到104.75mg·g-1，對Cd2+的吸附量最大達到43.11mg·g-1。對Pb2+和Cd2+在該吸附劑上的競爭吸附研究結果表明，競爭吸附的干擾使得Cd2+的吸附量降低88.47%，Pb2+的吸附量降低20.80%，且Pb2+的吸附量為Cd2+的5~6倍，吸附劑對重金屬離子的吸附選擇順序為Pb2+＞Cd2+。關鍵詞：改性；花生殼；鎘；鉛；吸附；競爭吸附中圖分類號：X703.1文獻標志碼：A文章編號：1672-2043(2011)0

3、7-1404-052+2+AdsorptionofCdandPbfromAqueousSolutionbyModifiedPeanutShellsLINFang-fang1,YIXiao-yun1,2,DANGZhi1,2,ZHENGLiu-chun1（1.CollegeofEnvironmentalScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510006,China;2.TheKeyLabofPollutionControl

4、andEcosystemRestorationinIndustryClusters,MinistryofEducation,Guangzhou510006,China）Abstract：Theobjectiveofthisstudyistoseekforalowcostadsorbentmaterialtoremoveheavymetalionsfromaqueoussolution.Asahighvolumeagriculturalwaste,peanutshellsweremodifiedwithKMnO

5、4toproducebiomassadsorbent.Theadsorptioncapacityofthemodifiedad－sorbentstoremovecadmium（Ⅱ）andplumbum（Ⅱ）fromaqueoussolutionwereinvestigatedindifferentconditions.ResultsshowedthattheoptimuminitialsolutionpHvaluesforadsorptionwere4.5fortheleadand6.5forcadmium,

6、respectively.Theadsorptioncouldreachequilib－riuminabout18hours.Themaximumadsorptioncapacitywas104.75mg·g-1forPb2+and43.11mg·g-1forCd2+.Inaddition,thecompetitiveadsorptionofPb2+andCd2+onthemodifiedpeanutshellswasinvestigatedandtheresultsshowedtheadsorptionca

7、pacityofPb2+orCd2+wasmarkedlyrestrainedwiththecoexistingionsintheaqueoussolution.Comparingwiththesoleionadsorptionresults,thecompetitiveadsorp－tionhadmadeadsorptioncapacityofCd2+andPb2+fallabout88.47%and20.80%respectively.Inthecompetitiveadsorptiontest,thea

8、dsorp－tioncapacityofPb2+wasabout5~6timesofCd2+,whichshowedapreferenceforPb2+andindicatedtheadsorptionselectivitysequenceofthemodifiedpeanutshellsforthesetwoheavymetalsisPb2+>Cd2+.Keywords：modification;