蒙脱石复合材料对Zn~(2+)和对硝基苯酚的同步捕集
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摘要
采用十八烷基三甲基氯化铵(STAC)和有机螯合剂乙二胺(En)复合修饰钠基膨润土制备了功能化蒙脱石复合材料(FMC),并将其应用于复合污染废水处理.利用X射线衍射仪(XRD)、超高分辨场发射扫描电子显微镜(FE-SEM)、傅里叶变换红外光谱仪(FTIR)、全自动物理吸附仪、元素分析仪及Zeta电位分析仪对所得复合材料进行了表征,发现复合修饰制备的FMC层间距增大、疏水性增强;FMC能同步捕集水中重金属Zn~(2+)和有机物对硝基苯酚(PNP).研究发现,当En/STAC摩尔比为0.75、p H=4、吸附温度为40℃、吸附时间为60 min时,FMC对Zn~(2+)和PNP的同步捕集吸附量达224.2 mmol/kg.FMC对Zn~(2+)的吸附主要表现为离子交换和配位络合;其对PNP的吸附取决于层间有机C和N含量及层间距大小.
Na-bentonite was modified by cationic modification agent octadecyl trimethyl ammonium chloride(STAC)and organic chelating agent ethylenediamine(En)to prepare the functionalized montmorillonite composites(FMC)for the treatment of composite pollution wastewater.Based on the analysis and characterization of X-ray diffraction(XRD),field emission-scanning electron microscopy(FE-SEM),Fourier transform infrared spectroscopy(FTIR),automatic physical adsorption analysis,elemental analysis and zeta potential analysis,it was found that there was an increase in the basal spacing and the hydrophobic ability of FMC prepared by composite modification.FMC could realize the synchronization capture of heavy metal Zn~(2+) and the organic matter p-nitrophenyl pheno(PNP).The results showed that the synchronization capture amount of Zn~(2+) and PNP on FMC was up to 224.2 mmol/kg under the conditions that En/STAC molar ratio was 0.75,p H value was 4,the adsortption temperature was 40℃and the adsorption time was 60 min.The adsorption behaviors of FMC on Zn~(2+) were mainly characterized by ion exchange and coordination complexation,while that of FMC on PNP were determined by both the content of organic C and organic N and the size of layer spacing.
Na-bentonite was modified by cationic modification agent octadecyl trimethyl ammonium chloride(STAC)and organic chelating agent ethylenediamine(En)to prepare the functionalized montmorillonite composites(FMC)for the treatment of composite pollution wastewater.Based on the analysis and characterization of X-ray diffraction(XRD),field emission-scanning electron microscopy(FE-SEM),Fourier transform infrared spectroscopy(FTIR),automatic physical adsorption analysis,elemental analysis and zeta potential analysis,it was found that there was an increase in the basal spacing and the hydrophobic ability of FMC prepared by composite modification.FMC could realize the synchronization capture of heavy metal Zn~(2+) and the organic matter p-nitrophenyl pheno(PNP).The results showed that the synchronization capture amount of Zn~(2+) and PNP on FMC was up to 224.2 mmol/kg under the conditions that En/STAC molar ratio was 0.75,p H value was 4,the adsortption temperature was 40℃and the adsorption time was 60 min.The adsorption behaviors of FMC on Zn~(2+) were mainly characterized by ion exchange and coordination complexation,while that of FMC on PNP were determined by both the content of organic C and organic N and the size of layer spacing.
引文
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[5]Li T.T.,Zhao L.L.,Wang R.L.,Zhang S.Q.,Chem.J.Chinese Universities,2017,38(5),722—728(李婷婷,赵乐乐,王锐利,张淑秋.高等学校化学学报,2017,38(5),722—728)
[6]Pawar R.R.,Lalhmunsiama,Bajaj H.C.,Lee S.M.,J.Ind.Eng.Chem.,2016,34,213—223
[7]Qu X.,Liu P.,Zhu D.,Environ.Sci.Technol.,2008,42(4),1109—1116
[8]Kameda T.,Shimamori S.,Yoshioka T.,J.Phys.Chem.Solids,2012,73(1),120—123
[9]Sun H.L.,Zhu L.Z.,Chem.J.Chinese Universities,2007,28(8),1475—1479(孙洪良,朱立中.高等学校化学学报,2007,28(8),1475—1479)
[10]Zhu R.,Chen W.,Liu Y.,Zhu J.,J.Hazard.Mater.,2012,233/234(1),228—234
[11]Zhou Q.,Zhu R.,Parker S.,Zhu J.,RSC Adv.,2015,5(58),47022—47030
[12]Zhu R.,Zhu L.,Xu L.,Colloids Surf.A,2007,294(1—3),221—227
[13]Zhu R.,Chen Q.,Zhou Q.,Xi Y.,Zhu J.,He H.,Appl.Clay Sci.,2016,123,239—258
[14]Hu C.,Deng Y.,Hu H.,Int.J.Bio.Macromol.,2016,92,1191—1196
[15]Ljagbemi C.O.,Baek M.H.,Kim D.S.,J.Hazard.Mater.,2009,166(1),538—546
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[17]Wu P.,Dai Y.,Long H.,Zhu N.,Li P.,Chem.Eng.J.,2012,191(19),288—296
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[19]Fu M.,Zhang Z.,Wu L.,Zhuang G.,Zhang S.,Appl.Clay Sci.,2016,132/133,694—701
[20]Wu S.Q.,Zhang Z.P.,Wang Y.H.,Liao L.B.,Zhang J.S.,Mater.Res.Bull.,2014,59(16),59—64
[21]Chen X.L.,Deng L.C.,Wang X.F.,Chem.J.Chinese Universities,2014,35(12),2510—2515(陈晓磊,邓李川,王晓峰.高等学校化学学报,2014,35(12),2510—2515)
[22]Chen H.H.,Thirumavalavan M.,He R.Z.,Shih Y.T.,Appl.Clay Sci.,2017,137,192—202
[23]Bajda T.,Kapyta Z.,Appl.Clay Sci.,2013,86(3),169—173
[24]Dai Y.P.,Wu P.X.,Acta Sci.Circumstantiae,2012,32(10),2402—2407(代亚平,吴平霄.环境科学学报,2012,32(10),2402—2407)
[25]Liu J.J.,Liang D.L.,Environ.Sci.,2014,35(1),254—262(刘娟娟,梁东丽.环境科学,2014,35(1),254—262)
[26]Zhu R.,Chen Q.,Zhu R.,Xu Y.,Ge F.,Zhu J.,He H.,Appl.Clay Sci.,2015,107,90—97
[27]Yang S.F.,Gao M.L.,Luo Z.X.,Yang Q.,Chem.Eng.J.,2015,268,125—134
[28]Yang X.H.,Wei S.Y.,Fang D.,Dan Y.M.,Chin.J.Inorg.Chem.,2014,30(12),2863—2871(杨小洪,魏世勇,方敦,但悠梦.无机化学学报,2014,30(12),2863—2871)
[29]Long H.,Wu P.,Zhu N.,Chem.Eng.J.,2013,225(2),237—244
[30]Yu X.,Wei C.,Ke L.,J.Hazard.Mater.,2010,180(1—3),499—507