CPDB单一柱撑蒙脱石与CPDB/Al复合柱撑蒙脱石对水中Cr(Ⅵ)的吸附研究
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摘要
采用聚合羟基铝提供Al源结合十六烷基溴化吡啶(CPDB)改性钠基蒙脱石(MONT),制备了CPDB-MONT和Al-CPDB-MONT吸附剂,利用XRD,BET,FT-IR对样品进行表征,并考察了其对Cr(Ⅵ)的吸附,研究了改性蒙脱石吸附Cr(Ⅵ)的吸附动力学和吸附等温线。经改性后,CPDB与羟基铝均成功柱撑进入MONT层间。相比于MONT,CPDB-MONT与Al-CPDB-MONT分别使层间距从1. 111 8nm扩撑到1. 898 7nm,1. 935 4nm;比表面积分别从46. 249m~2/g增大到136. 111 m~2/g,151. 497m~2/g;经过CPDB改性土和CPDB-Al复合改性土吸附模拟Cr(Ⅵ)废水满足拟二级动力学和Langmuir方程,该过程推动力和吸附类型分别为正负静电引力和物理吸附。相同条件下,Al-CPDB-MONT去除效果优于CPDB-MONT和MONT。在酸性、低温条件下反应效果更佳。
The calcium/montmorillonite was used as raw material,the CPDB-MONT and Al-CPDB-MONT were modified with cetylpyridinium bromide( CPDB) and polymeric hydroxyl aluminum cations. The adsorbents were characterized by XRD,BET,and FT-IR. The adsorption of chromium( Ⅵ) and the adsorption kinetics and isotherms were studied. The aluminum hydroxypolycation and CPDB was intercalated into MONT' s layer successfully by modification. Compared with MONT,CPDB-MONT and Al-CPDB-MONT' s interlayer spacing respectively increased from 1. 111 8 nm to 1. 898 7 nm,1. 935 4 nm; and the specific surface area increased from 46. 249 m~2/g to 136. 111 m~2/g,151. 497 m~2/g,respectively. The results showed that the adsorption process of Cr( Ⅵ) onto CPDB-MONT and Al-CPDB-MONT adsorbents can be described by pseudo-second-order kinetics model; the Langmuir model can preferably describe the adsorption process of Cr( Ⅵ) adsorbed on the two series adsorbents. Both two adsorption belongs to physical adsorption and the main driver of adsorption was the attraction between the positive and negative charges. On the same condition,the maximum adsorption capacity followed the order Al-CPDB-MONT > CPDB-MONT > MONT.
The calcium/montmorillonite was used as raw material,the CPDB-MONT and Al-CPDB-MONT were modified with cetylpyridinium bromide( CPDB) and polymeric hydroxyl aluminum cations. The adsorbents were characterized by XRD,BET,and FT-IR. The adsorption of chromium( Ⅵ) and the adsorption kinetics and isotherms were studied. The aluminum hydroxypolycation and CPDB was intercalated into MONT' s layer successfully by modification. Compared with MONT,CPDB-MONT and Al-CPDB-MONT' s interlayer spacing respectively increased from 1. 111 8 nm to 1. 898 7 nm,1. 935 4 nm; and the specific surface area increased from 46. 249 m~2/g to 136. 111 m~2/g,151. 497 m~2/g,respectively. The results showed that the adsorption process of Cr( Ⅵ) onto CPDB-MONT and Al-CPDB-MONT adsorbents can be described by pseudo-second-order kinetics model; the Langmuir model can preferably describe the adsorption process of Cr( Ⅵ) adsorbed on the two series adsorbents. Both two adsorption belongs to physical adsorption and the main driver of adsorption was the attraction between the positive and negative charges. On the same condition,the maximum adsorption capacity followed the order Al-CPDB-MONT > CPDB-MONT > MONT.
引文
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[18]关文斌,赵彬侠.Cr(Ⅵ)在改性蒙脱石上吸附行为的研究[J].西北大学学报(自然科学版),2016,46(7):52-58.
[2]PAUSTENBACH D,FINLEY B,MOWAT F,et al.Human health risk and exposure assessment of chromium(Ⅵ)in tap water[J].Journal of Toxicology and Environmental Health,Part A,2003,66(17):1295-1339.
[3]封明,雷小利.电解法在废水处理中的应用[J].电镀与精饰,2013,35(1):43-46.
[4]王湖坤,王慧.铁屑-活性炭微电解法处理含铬废水的研究[J].上海化工.2008,33(3):1-3.
[5]罗斌,董宏宇.离子交换回收电镀废水中六价铬的研究[J].广州化工.2010,38(3):96-99.
[6]BARTLETT R J,KIMBLE J M.Behavior of chromium in soils:I.trivalent forms[J].Journal of Environmental Quality,1976,5(4):379-383.
[7]QDAIS H A,MOUSSA H.Removal of heavy metals from wastewater by membrane processes:A comparative study[J].Desalination,2004,164(2):105-110.
[8]FU F,WANG Q.Removal of heavy metal ions from wastewaters:A review[J].Journal of Environmental Management,2011,92(3):407-418.
[9]邓书平,牟淑杰.PDMDAAC改性膨润土吸附处理含Cr(VI)废水的实验研究[J].中国非金属矿工业导刊,2008(5):24-26.
[10]童张法,蓝磊,李仲民,等.改性膨润土对废水中六价铬的吸附过程研究[J].环境污染与防治,2005,27(5):352-354,378.
[11]HE H,RAY F L,ZHU J.Infrared study of HDT-MA+,intercalated montmorillonite[J].Spectrochimica Acta Part A Molecular&Biomolecular Spectroscopy,2004,60(12):2853-2859.
[12]THANOS A G,KATSOU E,MALAMIS S,et al.E-valuation of modified mineral performance for chromate sorption from aqueous solutions[J].Chemical Engineering Journal,2012,s 211-212(s 211-212):77-88.
[13]PAUSTENBACH D J,FINLEY B L,MOWAT F S,et al.Human health risk and exposure assessment of chromium(Ⅵ)in tap water[J].Journal of Toxicology&Environmental Health Part A,2003,66(14):1295.
[14]QDAIS H A,MOUSSA H.Removal of heavy metals from wastewater by membrane processes:A comparative study[J].Desalination,2004,164(2):105-110.
[15]LI Y H,WANG S,WEI J,et al.Lead adsorption on carbon nanotubes[J].Chemical Physics Letters,2002,357(3-4):263-266.
[16]HUANG L,XIAO C,CHEN B.A novel starch-based adsorbent for removing toxic Hg(II)and Pb(II)ions from aqueous solution[J].Journal of Hazardous Materials,2011,192(2):832-836.
[17]BAKANDRITOSOS A,STERIOTIS T,PETRIDIS D.High surface area montmorillonite-carbon composites and derived carbons[J].Chemistry of Materials,2004,16(8):1551-1559.
[18]关文斌,赵彬侠.Cr(Ⅵ)在改性蒙脱石上吸附行为的研究[J].西北大学学报(自然科学版),2016,46(7):52-58.