P(CMSNa-NaAlg-AA)高吸水树脂制备及其性能研究
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摘要
以一定比例的羧甲基淀粉钠(CMSNa)、海藻酸钠(Na Alg)为接枝基体,丙烯酸(AA)为单体,过硫酸铵(NPS)为引发剂,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,采用水溶液聚合法合成高吸水树脂。探讨了不同反应条件对吸水性能的影响,并研究了吸水树脂吸附重金属(Cd2+)的动力学及热力学特性。结果表明,当m(CMSNa):m(Na Alg)=2.5,引发剂用量为单体用量0.3%,交联剂用量为单体用量0.025%,丙烯酸中和度为70%,反应温度为65℃时,吸去离子水及0.9%Na Cl溶液倍率分别为2 308.48 g/g、126.8 g/g。吸水树脂对于镉离子的吸附研究表明,高吸水树脂对于镉离子的吸附在p H值为7时吸附容量最大,为343.44 mg/g,且吸附符合准二级动力学模型及Langmuir吸附等温模型。
The water-absorbent resin is prepared by aqueous solution polymerization,with a certain proportion of carboxymethyl starch( CMSNa),alginate( Na Alg) as the graft matrix,acrylic acid( AA) as monomers,ammonium persulfate( NPS) as initiator,N,N'-methylene double acrylamide( MBA) as cross-linking agent. The effects of different reaction conditions on the water absorption were discussed. The kinetics and thermodynamic properties of heavy metal( Cd2 +) adsorbed by water-absorbent resin were studied. The results showed that,the ratio of deionized water and 0. 9% Na Cl solution was 2308. 48 g/g and 126. 8 g/g when m( CMSNa) : m( Na Alg) = 2. 5,the amount of initiator was 0. 3%,the amount of crosslinking agent was 0. 025%,neutralization degree of acrylic acid was 70%,and the reaction temperature was 65 ℃. Absorption of Cd2 +by water-absorbent resin showed that,the maximum adsorption capacity of the absorbent resin was 343. 44 mg/g in a solution of p H 7. And the adsorption is in accordance with quasi second order kinetics model and Langmuir adsorption isotherm model.
The water-absorbent resin is prepared by aqueous solution polymerization,with a certain proportion of carboxymethyl starch( CMSNa),alginate( Na Alg) as the graft matrix,acrylic acid( AA) as monomers,ammonium persulfate( NPS) as initiator,N,N'-methylene double acrylamide( MBA) as cross-linking agent. The effects of different reaction conditions on the water absorption were discussed. The kinetics and thermodynamic properties of heavy metal( Cd2 +) adsorbed by water-absorbent resin were studied. The results showed that,the ratio of deionized water and 0. 9% Na Cl solution was 2308. 48 g/g and 126. 8 g/g when m( CMSNa) : m( Na Alg) = 2. 5,the amount of initiator was 0. 3%,the amount of crosslinking agent was 0. 025%,neutralization degree of acrylic acid was 70%,and the reaction temperature was 65 ℃. Absorption of Cd2 +by water-absorbent resin showed that,the maximum adsorption capacity of the absorbent resin was 343. 44 mg/g in a solution of p H 7. And the adsorption is in accordance with quasi second order kinetics model and Langmuir adsorption isotherm model.
引文
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[3]余响林,饶聪,秦天,等.反相悬浮聚合法制备高吸水树脂研究进展[J].化工新型材料,2014(10):20-22.YU X L,RAO C,QIN T,et al.Preparation of superabsorbent polymer by reversed-phase suspension polymerization[J].New Chemical Materials,2014(10):20-22.
[4]孙宾宾,孟龙.微波辐射制备合成聚合物系列高吸水树脂研究进展[J].化学工程师,2014,28(11):30-33.SUN B B,MENG L.Research advances in preparation of synthetic polymer series super-absorbent resin by microwave irradiation[J].Chemical Engineer,2014,28(11):30-33.
[5]杨鸿嘉,程志强,康立娟,等.PEGDA交联PAA-K高吸水树脂制备及性能研究[J].中国塑料,2016,30(2):43-48.YANG H J,CHENG Z Q,KANG L J,et al.Preparation and properties of PEGDA cross linked PAA-K water absorbency resin[J].China Plastics,2016,30(2):43-48.
[6]安俊健,李新平.羧甲基淀粉钠(CMS)的合成与应用现状[J].湖南造纸,2005(1):27-30.AN J J,LI X P.The study and application actuality of carboxyl methyl starch sodium[J].hunan papermaking,2005(1):27-30
[7]高春梅,柳明珠,吕少瑜,等.海藻酸钠水凝胶的制备及其在药物释放中的应用[J].化学进展,2013(6):1012-1022.GAO C M,LIU M Z,LV S Y,et al.Preparation of sodium alginate hydrogel and its application in drug release[J].Progress in Chemistry,2013(6):1012-1022.
[8]霍全,刘冬,赵晶晶,等.海藻酸钠/羧甲基纤维素/丙烯酸双母系高吸水性树脂的合成与表征[J].燕山大学学报,2016,40(2):184-188.HUO Q,LIU D,ZHAO J J,et al.Synthesis and characterization of double matriarchal SSA/CMC/AA absorbent resin[J].Journal of Yanshan University,2016,40(2):184-188.
[9]柳明珠,曹丽歆.丙烯酸与海藻酸钠共聚制备耐盐性高吸水树脂[J].应用化学,2002,19(5):455-458.LIU M Z,CAO L X.Preparation of a superabsorbent resistant to saline solution by copolymerization of acrylic acid with sodium polymannuronate[J].Chinese Journal of Applied Chemistry,2002,19(5):455-458.
[10]张小红,崔英德.反相悬浮聚合法合成可生物降解海藻酸钠高吸水性树脂[J].精细化工,2006,23(3):218-222.ZHANG X H,CUI Y D.Synthesis of biodegradable sodium alginate super absorbent by inverse suspension copolymerization[J].Fine Chemicals,2006,23(3):218-222.
[11]黄慧珍.聚丙烯酸-海藻酸钠吸水树脂的制备及性能研究[J].广州化工,2012,40(12):96-97.HUANG H Z.Study on preparation and properties of polyacrylic acid-sodium alginate absorbent resin[J].Guangzhou Chemical Industry and Technology,2012,40(12):96-97.
[12]王丽,童群义,王红勤.交联聚丙烯酸钠与交联羧甲基淀粉复配的高吸水性树脂的制备[J].化工新型材料,2007,35(12):40-41.WANG L,QIU Q Y,WANG H Q.Preparation of superabsorbent by mixing crosslinked sodium polyacrylate and crosslinked carboxymethyl starch[J].New Chemical Materials,2007,35(12):40-41.
[13]XIANG Y,XU W,OU E,et al.Preparation and characterization of strongly swellable modified-lignosulfonate hydrogel particles[J].Iranian Polymer Journal,2013,22(10):749-756.
[14]向育君,许爱清,周信,等.改性木质素磺酸钠水凝胶对镉离子的吸附研究[J].离子交换与吸附,2015(2):115-122.XIANG Y J,XU A Q,ZHOU X,et al.Adsorption of cadmium ions by modified sodium lignosulphonate hydrogel[J].Ion Exchange and Adsorption,2015(2):115-122.
[15]何明,尹国强,王品,等.羽毛蛋白基高吸水性树脂吸附Cd2+的动力学和热力学研究[J].化工新型材料,2013,41(6):72-74.HE M,YIN G Q,WANG P,et al.Kinetics and thermodynamics of Cd2+adsorption onto feather protein based superabsorbent resins[J].New Chemical Materials,2013,41(6):72-74.