以玉米秸秆为原料制备纳米纤维素/丙烯酸水凝胶并用于染料废水吸附。首先,采用表面接枝共聚法制备水凝胶,利用傅里叶变换红外光谱(FT-IR)、扫描电镜(SEM)、X射线衍射(XRD)和热重分析(TG)对其进行了表征,并进行水凝胶溶胀性能测试。结果表明:水凝胶具有立体蜂窝网状结构,丙烯酸的接枝共聚作用使样品结晶度降低、热稳定性增强。升高温度、碱性介质中水凝胶表现出更好的溶胀能力,但是介质中阳离子价态高溶胀能力下降。最后,对水凝胶吸附亚甲基蓝机理进行了探讨,吸附过程符合Langmuir等温吸附模型,以发生在水凝胶活性基团的单层吸附为主;吸附动力学符合准二级动力学模型,是一种化学吸附。
Using corn stalk as raw material,nanocellulose/acrylic acid hydrogel was prepared and used for dye wastewater adsorption.First,the surface graft copolymerization method was used to prepare the hydrogel,and the hydrogel was characterized by Fourier transform infrared (FT-IR),scanning electron microscope (SEM),X-ray diffraction (XRD) and thermogravimetric analysis (TG).Furthermore,its swelling property was tested.The results showed that the hydrogel had a three-dimensional honeycomb network structure,and the graft copolymerization of acrylic acid reduced the crystallinity of the sample and enhanced the thermal stability.The hydrogel exhibited better swelling ability at elevated temperature in the alkaline medium,but the swelling ability decreased at high cationic valence in the medium.Finally,the mechanism of the adsorption of methylene blue on the hydrogel was discussed.The adsorption process conformed to the Langmuir isotherm adsorption model,which was dominated by the monolayer adsorption of hydrogel active groups;the adsorption kinetics was consistent with the quasi-secondary kinetic model,which was a kind of chemical adsorption.
[1] 孙海涛,邵信儒,瞿照婷,等.玉米秸秆纳米纤维素的制备及表征[J].食品科学,2018,39(8):205-211.
[2] Siró I,Plackett D.Microfibrillated cellulose and new nanocomposite materials:a review[J].Cellulose,2010,17(3):459-494.
[3] Mesquita J O P,De Donnici C L,Pereira F V.Biobased nanocomposites from layer-by-layer assembly of cellulose nanowhiskers with chitosan[J].Biomacromolecules,2010,11(2):473-480.
[4] Samir M,Alloin F,Dufresne A.Review of recent research into cellulosic whiskers,their properties and their application in nanocomposite field[J].Biomacromolecules,2005,6:612-626.
[5] 杜海顺.甲酸水解法制备纳米纤维素及其自组装膜的表征[D].天津:天津科技大学,2017.
[6] Zheng L,Dang Z,Yi X,et al.Equilibrium and kinetic studies of adsorption of Cd(Ⅱ) from aqueous solution using modified corn stalk[J].Journal of Hazardous Materials,2010,176(1-3):650-656.
[7] Chen S,Yue Q,Gao B,et al.Adsorption of hexavalent chromium from aqueous solution by modified corn stalk:a fixed-bed column study[J].Bioresource Technology,2012,113:114-120.
[8] Shewan H,Stokes J.Review of techniques to manufacture micro-hydrogel particles for the food industry and their applications[J].Journal of Food Engineering,2013,119(4):781-792.
[9] Ullah F,Othman M,Javed F,et al.Classification,processing and application of hydrogels:a review[J].Materials Science and Engineering:C,2015,57:414-433.
[10] 白玉明.丙烯酸羟乙酯交联共聚物水凝胶的制备及性能研究[D].上海:华东理工大学,2014.
[11] 彭彬,沈冲,孟琴.DA-P123水凝胶的溶胀因素及其用于去除溶液中的重金属离子[J].高校化学工程学报,2017,31(6):1426-1432.
[12] Majumdar S,Dey J,Adhikari B.Taste sensing with polyacrylic acid grafted cellulose membrane[J].Talanta,2006,69(1):131-139.
[13] Ruma B,Samit K R.Kinetic and equilibrium modeling for adsorption of textile dyes in aqueous solutions by carboxymethyl cellulose/poly(acrylamide-co-hydroxyethyl methacrylate) semi-interpenetrating network hydrogel[J].Polymer Engineering & Science,2013,53(11):2439-2354.
[14] Yang F,Li G,He Y G,et al.Synthesis,characterization,and applied properties of carboxymethyl cellulose and polyacrylamide graft copolymer[J].Carbohydrate Polymers,2009,78(1):95-99.
[15] Karadağ E,Üzüm Ö B,Saraydin D.Swelling equilibria and dye adsorption studies of chemically crosslinked superabsorbent acrylamide/maleic acid hydrogels[J].European Polymer Journal,2002,38(11):2133-2141.
[16] Yu J,Yang G,Li Y,et al.Synthesis,characterization,and swelling behaviors of acrylic acid/carboxymethyl cellulose superabsorbent hydrogel by glow-discharge electrolysis plasma[J].Polymer Engineering & Science,2014,54(10):2310-2320.
[17] Ng J C Y,Cheung W H,Mckay G.Equilibrium studies of the sorption of Cu(Ⅱ) ions onto chitosan[J].Journal of Colloid and Interface Science,2002,255(1):64-74.
[18] Chatterjee S,Lee D S,Lee M W,et al.Enhanced adsorption of congo red from aqueous solutions by chitosan hydrogel beads impregnated with cetyl trimethyl ammonium bromide[J].Bioresource Technology,2009,100(11):2803-2809.
[19] Yagub M,Sen T,Afroze S,et al.Dye and its removal from aqueous solution by adsorption:a review[J].Advances in Colloid and Interface Science,2014,209:172-184.
基金资助
黑龙江省“百千万”工程科技重大专项项目(2021ZX12B07-1-6);黑龙江省自然科学基金项目(LH2021E090)
PDF
