摘要
以介孔硅酸钙(MCS)为原料,(3-巯基丙基)三甲氧基硅烷为改性剂通过后接枝法制备巯基化介孔硅酸钙(MCS-SH)。采用XRD、FT-IR、BET表面分析、SEM、TEM和EDX等对其结构和组成进行表征;考察了其对Pb~(2+)的吸附和洗脱再生性能,并与MCS和活性炭进行比较。结果表明,MCS-SH仍维持较稳定的介孔结构,为夹缝孔,比表面积为129.32 m~2·g~(-1),孔径范围为5-49 nm,比表面积比MCS减少28.81 m~2·g~(-1),孔径减少2 nm;MCS-SH中接入的-SH量为0.1678 mmol·g~(-1);在293 K下,MCS-SH对Pb~(2+)的最大吸附容量为612.45 mg·g~(-1),明显高于MCS的最大吸附容量544.84 mg·g~(-1);在相同条件下,MCS-SH对Pb~(2+)的平衡吸附量大于MCS-SH,远大于活性炭;MCS-SH具有优良的吸附/再生性能,有望成为一种性能优良的重金属离子吸附材料。
引文
[1]刘立华,周智华,吴俊,等.两性高分子螯合絮凝剂与Cu(Ⅱ)、Pb(Ⅱ)、Cd(Ⅱ)、Ni(Ⅱ)的螯合稳定性[J].环境科学学报,2013,33(1):79-87
[2]Kavak D.Removal of lead from aqueous solutions by precipitation:statistical analysis and modeling[J].Desalination and Water Treatment,2013,51(7-9):1720-1726
[3]Kang S Y,Lee J U,Moon S H,et al.Competitive adsorption characteristics of Co2+,Ni2+,and Cr3+by IRN-77cation exchange resin in synthesized wastewater[J].Chemosphere,2004,56(2):141-147
[4]Wang L K,Hung Y T,Shammas N K.Advanced physicochemical treatment technologies[M].Humana Press,2007
[5]Fu F,Wang Q.Removal of heavy metal ions from wastewaters:a review[J].Journal of Environmental Management,2011,92(3):407-418
[6]Sheikhhosseini A,Shirvani M,Shariatmadari H.Competitive sorption of nickel,cadmium,zinc and copper on palygorskite and sepiolite silicate clay minerals[J].Geoderma,2013,192:249-253
[7]Shafiabadi M,Dashti A,Tayebi H A.Removal of Hg(II)from aqueous solution using polypyrrole/SBA-15nanocomposite:experimental and modeling[J].Synthetic Metals,2016,212:154-160
[8]Anbia M,Kargosha K,Khoshbooei S.Heavy metal ions removal from aqueous media by modified magnetic mesoporous silica MCM-48[J].Chemical Engineering Research and Design,2015,93:779-788
[9]王延梅,袁海宽.氨丙基硅三烷改性介孔二氧化硅及对痕量镉(Ⅱ)的分离富集性能研究[J].分析测试学报,2015,34(12):1382-1386
[10]Mureseanu M,Reiss A,Stefanescu I,et al.Modified SBA-15 mesoporous silica for heavy metal ions remediation[J].Chemosphere,2008,73(9):1499-1504
[11]Jia Y J,Zhang Y J,Wang R W,et al.Mesoporous Zirconium Phosphonate Hybrid Material as Adsorbent to Heavy Metal Ions[J].Industrial and Engineering Chemistry Research,2012,51(38):12266-12273
[12]Ma T Y,Zhang X J,Shao G S,et al.Ordered Macroporous Titanium Phosphonate Materials:Synthesis,Photocatalytic Activity,and Heavy Metal Ion Adsorption[J].Journal of Physical Chemistry C,2008,112(8):3090-3096
[13]Wu Z X,Webley P A,Zhao D Y.General and Controllable Synthesis of Novel Mesoporous Magnetic Iron Oxide@Carbon Encapsulates for Efficient Arsenic Removal[J].Advanced Materials,2012,24(4):485–491
[14]刘立华,杨刚刚,王易峰,等.模板法合成介孔硅酸钙及其对重金属离子的吸附性能[J].环境化学,2016,35(9):1943-1951
[15]Zhang M L,Chang J.Surfactant-assisted sonochemical synthesis of hollow calcium silicate(CSH)microspheres for drug delivery[J].Ultrasonics Sonochemistry,2010,17(5):789-792
[16]Mostafa N Y,Kishar E A,Abo-El-Enein S A.FTIR study and cation exchange capacity of Fe3+-and Mg2+-substituted calcium silicate hydrates[J].Journal of Alloys and Compounds,2009,473:538–542
[17]Zhu J Z,Yang J,Deng B L.Ethylenediamine-modified activated carbon for aqueous lead adsorption[J].Environmental Chemistry Letters,2010,8:277–282