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Characterization and Interpretation

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1ScientificRepoRtS|(2019)9:17868|https://doi.org/10.1038/s41598-019-54337-1www.nature.com/scientificreportscharacterizationandinterpretationofCd(II)AdsorptionbyDifferentModifiedRiceStrawsundercontrastingconditionsShuaiWang1,2,5*,NanWang1,5,KaiYao3,Yuchuanfan2,WanhongLi1,WeihuaHan1,XinhuaYin4*&Dianyuanchen1*RicestrawcanadsorbCd(II)fromwastewater,andmodificationofricestrawmayimproveitsadsorptionefficiency.Thericestrawpowder(Sp)fromthedirectpulverizationofricestrawwasusedasthecontrol,thericestrawash(Sa),biochar(Sa),andmodifiedricestraw(Ms)werepreparedbyashing,pyrolysisandcitricacidmodification,respectively,andallofthemwereexaminedasadsorbentsforCd(II)inthisstudy.BatchadsorptionexperimentswereadoptedtosystematicallycomparetheadsorptioncapacitiesofricestrawmaterialspreparedwithdifferentmodificationmethodsforCd(II)fromaqueoussolutionunderdifferentlevelsofinitialCd(II)concentration(0–800mg·L−1),temperature(298,308,and318K),contacttime(0–1440min),pHvalue(2–10),andionicstrength(0–0.6mol·L−1).TheresultsindicatedthatthemodificationmethodaffectedtheadsorptionofCd(II)bychangingthespecificsurfacearea(SSA),Sicontent,surfacemorphology,andO-containingfunctionalgroupofricestraw.ComparedwithSp,MsheldmoresurfaceO–H,aliphaticandaromaticgroups,whileSahadmorephenolic,C–O(orC–O–C),andSi–Ogroups,andSbheldmoreC–O(orC–O–C)andSi–Ogroups;besides,Sa,Sb,andMshadlargerSSAthanSp.AdsorptioncapacityofthefouradsorbentsforCd(II)increasedandgraduallybecamesaturatedwiththeincreaseintheinitialCd(II)concentrati

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