甲基丙烯酸接枝纳米纤维素水凝胶的制备及吸附性能研究
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摘要
本文通过酸解法制备纳米纤维素(nCE),再利用自由基聚合法将甲基丙烯酸(MAA)接枝到纳米纤维素上,得到含有多孔结构的纤维素基水凝胶,并以制备的水凝胶作为吸附剂处理染料废水。用傅里叶变换红外光谱仪(FTIR)、和扫描电镜(SEM)技术对其进行了表征。讨论了吸附时间、pH、染料初始浓度、吸附剂用量对染料去除率的影响,优化了吸附条件。并对吸附机理进行了探讨,吸附动力学符合准二级动力学模型,平衡吸附等温线与Langmuir吸附等温方程拟合。通过对吸附等温线的拟合,计算得到了吸附剂对亚甲基蓝(MB)的最大吸附量为1250.00 mg·g~(-1)。
The nano cellulose(nCE)was prepared by acid hydrolysis method,methacrylic acid(MAA)grafted nano cellulose hydrogel was prepared by using the free radical polymerization.Cellulose-based hydrogels with porous structure was applied to treat dye wastewater.The products were characterized by Fourier transform infrared spectroscopy(FTIR)and scanning electron microscopy(SEM).The influences of adsorption time,pH,initial dye concentration and adsorbent dosage on the dye removal efficiency were discussed.The adsorption mechanism was also discussed,and the pseudo-second-order model fitted MB adsorption better than the pseudo-first-order.The equilibrium adsorption isotherm was fitted to the Langmuir adsorption.The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of this hydrogel was 1250 mg·g~(-1).
The nano cellulose(nCE)was prepared by acid hydrolysis method,methacrylic acid(MAA)grafted nano cellulose hydrogel was prepared by using the free radical polymerization.Cellulose-based hydrogels with porous structure was applied to treat dye wastewater.The products were characterized by Fourier transform infrared spectroscopy(FTIR)and scanning electron microscopy(SEM).The influences of adsorption time,pH,initial dye concentration and adsorbent dosage on the dye removal efficiency were discussed.The adsorption mechanism was also discussed,and the pseudo-second-order model fitted MB adsorption better than the pseudo-first-order.The equilibrium adsorption isotherm was fitted to the Langmuir adsorption.The Langmuir isotherm model revealed that the maximum theoretical adsorption capacity of this hydrogel was 1250 mg·g~(-1).
引文
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[3]Coasne B,Alba-Simionesco C,Audonnet F,et al.Adsorption,structure and dynamics of benzene in ordered and disordered porous carbons[J].Phys Chem Chem Phys,2011,13(9):3748-3757.
[4]de Campos Ventura-Camargo B,de Angelis D F,Marin-Morales M A.Assessment of the cytotoxic,genotoxic and mutagenic effects of the commercial black dye in Allium cepa cells before and after bacterial biodegradation treatment[J].Chemosph,2016,161:325-332.
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[6]Nie G,Li Z,Lu X,et al.Fabrication of polyacrylonitrile/CuS composite nanofibers and their recycled application in catalysis for dye degradation[J].Appl Surf Sci,2013,284:595-600.
[7]Mahmoodi N M,Najafi F,Neshat A.Poly(amidoamine-co-acrylic acid)copolymer:Synthesis,characterization and dye removal ability[J].Indust Crops Produ,2013,42:119-125.
[8]Taleb M F A,El-Mohdy H L A,El-Rehim H A A.Radiation preparation of PVA/PGC copolymers and their application in removal of dyes[J].J hazard mater,2009,168(1):68-75.
[9]Zhang G,Yi L,Deng H,et al.Dyes adsorption using a synthetic carboxymethyl cellulose-acrylic acid adsorbent[J].J Environ Sci,2014,26(5):1203-1211.
[10]Liu X,Chang P R,Zheng P,et al.Porous cellulose facilitated by ionic liquid[BMIM]Cl:fabrication,characterization,and modification[J].Cellulose,2015,22(1):709-715.
[11]Ghorai S,Sarkar A,Raoufi M,et al.Enhanced removal of methylene blue and methyl violet dyes from aqueous solution using a nanocomposite of hydrolyzed polyacrylamide grafted xanthan gum and incorporated nanosilica[J].ACS Appl Mater Interfa,2014,6(7):4766-4777.
[12]Metin A U,C?iftc?I H,Alver E.Efficient removal of acidic dye using low-cost biocomposite beads[J].Indust Engine Chem Resea,2013,52(31):10569-10581.
[13]Zhang S,Zhang Y,Bi G,et al.Mussel-inspired polydopamine biopolymer decorated with magnetic nanoparticles for multiple pollutants removal[J].J Hazard Mater,2014,270(8):27-34.
[14]Liu,L.;Gao,Z.Y.;Su,X.P.;et al.,Adsorption Removal of Dyes from Single and Binary Solutions Using a Cellulose-based Bioadsorbent[J].Acs Susta Chemi Engine 2015,3,(3),432-442.
[15]Mohammed,N.;Grishkewich,N.;Waeijen,H.A.;et al,Continuous flow adsorption of methylene blue by cellulose nanocrystal-alginate hydrogel beads in fixed bed columns[J].Carboh Polym 2016,136,1194-202.
[16]Jin,Y.;Zhang,Y.;Lü,Q.;et al.,Biosorption of methylene blue by chemically modified cellulose waste[J].J Wuhan Univ Techn-Mater.Sci.Ed.2014,29,(4),817-823.
[17]Batmaz,R.;Mohammed,N.;Zaman,M.;et al.,Cellulose nanocrystals as promising adsorbents for the removal of cationic dyes[J].Cellul 2014,21,(3),1655-1665.