氨基改性二氧化硅气凝胶的制备及其对镍离子的吸附性能
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摘要
以正硅酸乙酯为硅源、3-氨丙基三乙氧基硅烷为改性剂,采用溶胶-凝胶法制备了氨基改性二氧化硅气凝胶,采用FTIR、SEM、TEM和BET技术对其进行了表征,并将其用于对水中镍离子的吸附。表征结果显示,改性前后的气凝胶均具有三维多孔网络结构,比表面积分别为877.35 m2/g和357.76 m2/g,平均孔径分别为10 nm和12 nm。实验结果表明:溶液pH为4～7时改性气凝胶对镍离子均保持较高的吸附量,溶液pH为6左右时吸附量最高;Langmuir等温吸附模型能更好地描述镍离子在改性气凝胶上的吸附行为,其饱和吸附量为70.03 mg/g,改性前仅为29.05 mg/g;改性气凝胶重复使用5次后,仍保持较高的镍离子去除率,重复使用性能良好。
Amine-modified silica aerogel for adsorption of nickel ions in water was prepared by sol-gel method using tetraethyl orthosilicate as silicon source and 3-aminopropyltriethoxysilane as modifier,and was characterized by FTIR,SEM,TEM and BET. The characterization results indicate that the aerogel before and after amine modification both has a three-dimensional porous network structure with specific surface areas of 877.35 m2/g and 357.76 m2/g,and average pore diameters of 10 nm and 12 nm,respectively. The experimental results show that:The adsorption quantity of nickel ions on the modified aerogel keeps higher at solution pH 4-7,and the highest value is about at pH 6;The Langmuir isotherm adsorption model could better describe the adsorption behavior,the saturated adsorption capacity is 70.03 mg/g,which is only 29.05 mg/g before modification;The modified aerogel has good reusability with high removal rate of nickel ion after reused for 5 times.
Amine-modified silica aerogel for adsorption of nickel ions in water was prepared by sol-gel method using tetraethyl orthosilicate as silicon source and 3-aminopropyltriethoxysilane as modifier,and was characterized by FTIR,SEM,TEM and BET. The characterization results indicate that the aerogel before and after amine modification both has a three-dimensional porous network structure with specific surface areas of 877.35 m2/g and 357.76 m2/g,and average pore diameters of 10 nm and 12 nm,respectively. The experimental results show that:The adsorption quantity of nickel ions on the modified aerogel keeps higher at solution pH 4-7,and the highest value is about at pH 6;The Langmuir isotherm adsorption model could better describe the adsorption behavior,the saturated adsorption capacity is 70.03 mg/g,which is only 29.05 mg/g before modification;The modified aerogel has good reusability with high removal rate of nickel ion after reused for 5 times.
引文
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[3] BABEL S,KURNIAWAN T A. Low-cost adsorbents for heavy metals uptake from contaminated water:a review[J]. J Hazard Mater,2003,97(1/3):219-243.
[4] MARQUES P A S S,ROSA M F,PINHEIRO H M.pH effects on the removal of Cu2+,Cd2+and Pb2+from aqueous solution by waste brewery biomass[J]. Bioprocess Eng,2000,23(2):135-141.
[5] FU F L,WANG Q. Removal of heavy metal ions from wastewaters:a review[J]. J Environ Manage,2011,92(3):407-418.
[6] JAMALY S,DARWISH N N,AHMED I,et al. A short review on reverse osmosis pretreatment technologies[J]. Desalination,2014,354:30-38.
[7]刘雨知，高嘉聪，隋振英，等.微电解技术在工业废水处理中的应用进展[J].化工环保，2017,37(2):136-140.
[8] HUANG Y G,WANG Z Q. Preparation of composite aerogels based on sodium alginate,and its application in removal of Pb2+and Cu2+from water[J]. Int J Biol Macromol,2018,107(Part A):741-747.
[9] KISTLER S S. Coherent expanded-aerogels[J]. J Phys Chem,1932,36(1):52-64.
[10] MALEKI H. Recent advances in aerogels for environmental remediation applications:a review[J]. Chem Eng J,2016,300:98-118.
[11] HUANG Y D,GAO X D,GU Z Y,et al. Aminoterminated SiO2 aerogel towards highly-effective lead （Ⅱ）adsorbent via the ambient drying process[J].J Non-Cryst Solids,2016,443:39-46.
[12] LINNEEN N N,PFEFFER R,LIN Y S. CO2 adsorption performance for amine grafted particulate silica aerogels[J]. Chem Eng J,2014,254:190-197.
[13] HE X,CHENG L,WANG Y R,et al. Aerogels from quaternary ammonium-functionalized cellulose nanofibers for rapid removal of Cr（Ⅵ）from water[J].Carbohydr Polym,2014,111:683-687.
[14] KANNAMBA B,LAXMA REDDY K,APPARAO B V. Removal of Cu（Ⅱ）from aqueous solutions using chemically modified chitosan[J]. J Hazard Mater,2010,175(1/3):939-948.
[15] CUI S,CHENG W W,SHEN X D,et al. Mesoporous amine-modified SiO2 aerogel:a potential CO2 sorbent[J]. Energy Environ Sci,2011,4(6):2070-2074.
[16] KISHOR R,GHOSHAL A K. APTES grafted ordered mesoporous silica KIT-6 for CO2 adsorption[J]. Chem Eng J,2015,262:882-890.
[17] GUIBAL E,MILOT C,TOBIN J M. Metal-anion sorption by chitosan beads:equilibrium and kinetic studies[J]. Ind Eng Chem Res,1998,37(4):1454-1463.
[18] JIANG T S,LIU W P,MAO Y L,et al. Adsorption behavior of copper ions from aqueous solution onto graphene oxide-CdS composite[J]. Chem Eng J,2015,259:603-610.
[19]李佳霜，冒国龙，赵松炎，等.改性生物炭对Sb（Ⅲ）的吸附行为及机理[J].化工环保，2018,38(5):546-551.