交联羧甲基壳聚糖树脂对稀土离子吸附性能研究

以羧甲基壳聚糖为原料，经戊二醛交联制备阳离子型树脂，考察了其对稀土离子La^3 、Nd^3 、Sm^3 、Lu^3 吸附性能。探讨了溶液的酸度、体系温度、初始离子浓度及离子强度对该树脂吸附性能的影响；发现羧甲基壳聚糖经戊二醛交联制成的树脂对稀土离子有较强的吸附性，最高吸附率可达99％以上，并且具有良好的重复使用性；其吸附性为满足Langmuir或Freumdilich等温式。     

改性壳聚糖磁性微球对胆红素的吸附

文章以具有良好生物相容性的改性壳聚糖磁性微球为载体吸附血液中的胆红素。研究了改性壳聚糖磁性微球在不同pH、温度、离子强度、初始浓度、牛血清白蛋白等条件下,对胆红素的吸附性能的影响。结果表明,该吸附剂对非结合型胆红素具有良好的吸附性能,在pH为7.5和37℃条件下具有最大吸附量,吸附平衡关系同时符合Frendlich和Langmiur模型。     

可再生羧甲基壳聚糖树脂的制备及对Eu(Ⅲ)离子吸附性能的研究

以羧甲基壳聚糖为原料，经戊二醛交联，制备阳离子型树脂。考察了其对稀土离子Eu^3 的吸附性能，探讨了溶液的酸度、初始离子浓度、反应时间及离子强度对该树脂吸附性能的影响；发现羧甲基壳聚糖经戊二醛交联制成的树脂对Eu3^ 有较强的吸附性能，可达到95％且吸附速度快，并且具有良好的使用性。     

聚氨基葡糖的成膜及其应用基础理论研究（I）

研究了不同脱乙酰度的聚氨基葡糖交联剂、交联时间及不同操作压力等因素对壳聚糖微孔膜分离效率的影响。研究表明，以乙二醛为交联剂，交联反应一天，膜液浓度超高，膜的性能越好；脱乙酰度越大的壳聚糖，交联后的分离效率越高。     

硫脲修饰交联壳聚糖对天然胶乳蛋白质含量影响的研究

以三聚氯氰为活化剂制备硫脲修饰戊二醛交联壳聚糖，用傅立叶红外吸收光谱对产物进行了初步表征；研究了壳聚糖及其衍生物处理对天然胶乳蛋白质含量的影响．以及处理时间、处理温度和鲜胶乳氨含量对硫脲修饰戊二醛交联壳聚糖处理鲜胶乳后所得浓缩天然胶乳蛋白质含量的影响。结果表明：硫脲修饰戊二醛交联壳聚糖处理鲜胶乳再经离心机浓缩处理可显著降低天然胶乳的蛋白质含量。在适宜的条件下，胶乳胶膜的氮质量分数从未处理的0．430％降至0．132％。鲜胶乳氨含量和处理时间对胶乳的蛋白质含量有较大影响．而处理温度则影响不显著。红外谱图分析表明．硫脲修饰戊二醛交联壳聚糖主要通过与蛋白质形成氢键的形式吸附胶乳中的蛋白质。     

磁性壳聚糖微球固定化小牛白蛋白的研究

考察了磁性壳聚糖微球对磷酸氢二钠-柠檬酸缓冲溶液中小牛白蛋白的吸附性能,采用TEM(透射电镜)、XRD(X-射线粉末衍射)分析微球的形貌、组成,深入探讨了磁性壳聚糖微球用量对蛋白质脱除率的影响、吸附温度和蛋白质溶液离子强度对微球吸附性能的影响。实验结果表明,蛋白质脱除率随磁性壳聚糖微球用量增大而增大,最终趋于平稳;随着温度升高,微球吸附蛋白量先增加后减小;蛋白溶液离子强度增加,微球吸附蛋白量降低。     

壳聚糖金属离子印迹树脂的吸附模型

引　言壳聚糖由于具有优良的生物相容性、金属离子螯合性等性能而在食品、医药及废水处理中有重要用途[1] .壳聚糖无毒 ,对重金属离子有很强的螯合性 ,Ｏｎｓｏｙｅｎ等将可溶性壳聚糖用于重金属离子的吸附[2 ] .但采用片状或凝胶状壳聚糖用于工业废水处理时 ,壳聚糖难于回收 ,成本高 .Ｋａｗａｍｕｒａ等报告了交联壳聚糖树脂用于重金属离子的吸附[3] ,交联壳聚糖机械性能好 ,可重复使用 ,但交联后金属离子吸附容量下降很大 ,这是由于许多壳聚糖分子上吸附的活性基团如ＮＨ2 被交联所致 .为解决该问题 ,日本Ｉｏｕｎｅ和国内曲荣君采用“模…     

壳聚糖Schiff碱的制备及其对金属离子吸附性能研究

文章采用微波辐射技术制备戊二醛交联壳聚糖水杨醛Schiff碱,探究其对铜离子的吸附性能。通过红外光谱仪,热分析仪和扫描电子显微镜对其结构及性能进行一系列表征,同时通过正交实验法考察其反应温度、时间、吸附动力学等影响因素对交联产物吸附性能的影响。扫描电镜分析表明交联改性后壳聚糖的表面明显发生变化,比壳聚糖更加松散,在吸附完成后改性壳聚糖的表面变得严密。由分析热失重可知改性壳聚糖热分解反应是258℃。由吸附动力学曲线可以得出改性壳聚糖对铜离子的吸附符合二级吸附动力学方程。     

微波辅助改性壳聚糖的制备及其对Ni~(2+)的吸附性能

利用微波辅助技术制备改性壳聚糖,探讨改性壳聚糖质量、吸附温度对吸附镍离子效果的影响,并绘制静态吸附曲线。结果表明:改性壳聚糖用量0. 25 g,吸附温度40℃,达到吸附平衡时间为60 min。     

壳聚糖超细纤维的制备及其铬离子吸附性能研究

利用静电纺丝和热交联技术,制备了良好形貌的交联壳聚糖/聚甲基丙烯酸(CS/PMAA)纤维膜,然后采用正丙醛化学改性得到改性CS/PMAA纤维膜。Cr(Ⅵ)离子吸附实验发现,铬元素浓度为6.50 mg/L时,CS/PMAA纤维膜的吸附量可以达到4.98 mg/g;而当铬元素浓度为3.75 mg/L时,铬的去除率可以达到81.0%;而且提高壳聚糖的含量有利于提高CS/PMAA纤维膜的吸附性能。改性CS/PMAA纤维膜吸附结果显示,正丙醛改性CS/PMAA纤维膜降低吸附性能,而进一步还原后的纤维膜的吸附性能优于未改性CS/PMAA纤维膜。实验结果表明,CS/PMAA纤维膜对铬离子具有良好的吸附性能;CS/PMAA纤维膜的吸附性能主要通过纤维氨基与Cr2O72-的相互作用进行,提高氨基的碱性和数量有利于提高纤维膜的吸附性能。     

Adsorption of bilirubin on poly‐L‐lysine‐containing nylon membranes: applications in affinity chromatography

Microporous polyamide membranes were activated by 1,1′‐carbonyldiimidazole (CDI) and subsequently bound with hydroxyethyl cellulose (HEC) to amplify reactive groups. Then poly‐L ‐lysine (PLL) as ligand was immobilized onto the HEC‐nylon membranes. The contents in HEC and PLL of PLL‐attached membranes were 153.2 and 63.8 mg (g nylon membrane)^?1, respectively. Such PLL‐HEC affinity membranes were used to adsorb bilirubin from bilirubin‐phosphate and bilirubin‐albumin solutions. The adsorption mechanism of bilirubin and the effects of temperature and ionic strength on adsorption were investigated by batch experiments. The results showed that the adsorption capacity increased with increasing temperature but decreased with increasing NaCl concentration, and the adsorption isotherm fitted the Freundlich model well. Dynamic experiments showed that PLL‐attached membranes can readily remove the bilirubin from bilirubin‐albumin solutions. Copyright © 2005 Society of Chemical Industry     

Studies of adsorption of alkaline trypsin by poly(methacrylic acid) brushes on chitosan membranes

Poly(methacrylic acid)‐grafted chitosan membranes (chitosan‐g‐poly(MAA)) were prepared in two sequential steps: in the first step, chitosan membranes were prepared by phase‐inversion technique and then epichlorohydrin was used as crosslinking agent to increase its chemical stability in acidic media; in the second step, the graftcopolymerization of methacrylic acid onto the chitosan membranes was initiated by ammonium persulfate (APS) under nitrogen atmosphere. The chitosan‐g‐poly(MAA) membranes were first used as an ion‐exchange support for adsorption of trypsin from aqueous solution. The influence of pH, equilibrium time, ionic strength, and initial trypsin concentration on the adsorption capacity of the chitosan‐g‐poly(MAA) membranes have been investigated in a batch system. Maximum trypsin adsorption onto chitosan‐g‐poly(MAA) membrane was found to be 92.86 mg mL^?1 at pH 7.0. The experimental equilibrium data obtained for trypsin adsorption onto chitosan‐g‐poly(MAA) membranes fitted well to the Langmuir isotherm model. The adsorption data was analyzed using the first‐ and second‐order kinetic models, and the experimental data was well described by the second‐order equation. More than 97% of the adsorbed trypsin was desorbed using glutamic acid solution (0.5M, pH 4.0). In addition, the chitosan‐g‐ poly(MAA) membrane prepared in this work showed promising potential for various biotechnological applications. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

两种土壤对内分泌干扰物双酚A和类固醇的吸附性能

论文采用批量平衡法,研究两种土壤对于内分泌干扰物双酚A和类固醇（E1、E2、EE2、E3）的吸附特征,并探讨了温度和离子强度对吸附的影响。结果表明,五种物质在两种土壤中的吸附存在快速吸附和缓慢平衡的过程,Freundlich方程能够较好的拟合土壤对水中低浓度内分泌干扰物双酚A和类固醇的吸附等温线。土壤对五种物质的吸附是放热过程,温度升高会降低土壤的吸附容量。随着离子强度的增加,吸附容量增大。     

两性壳聚糖的制备及其处理磷化废水的研究

以壳聚糖、3-氯-2-羟丙基三甲基氯化铵、氯乙酸为原料,制备了两性壳聚糖。以两性壳聚糖为吸附剂,处理磷化废水。通过单因素实验考察了pH、吸附剂用量、吸附时间和温度等因素对吸附效果的影响,对吸附机理进行了初探。结果表明,室温下最佳吸附工艺条件pH为2.0,ρ(吸附剂)为12.0g/L,吸附t为2.0h。此条件下,两性壳聚糖对磷化废水中锌离子和磷酸根的去除率分别达到78.9%和88.2%。     

亲和膜配基的结构和密度对胆红素吸附的影响

体内存在过量的胆红素会引起神经系统疾病,严重时危及生命,常用循环吸附法去除,但是多数胆红素与白蛋白形成复合物,难于拆分,导致血清胆红素的吸附去除率降低。以醋酸纤维素/聚乙烯基亚胺共混亲和膜(CA/PEI膜)为基质,通过戊二醛活化,引入间隔臂,固载具有一定特异性吸附的5种有机胺和8种氨基酸配基,强化血清胆红素的去除效果。研究结果表明,虽然改性膜的伯胺基含量仅为CA/PEI膜的1/3,但是因间隔臂的引入和配基特异性的增强,4种改性膜的胆红素吸附量提高了100%以上,并且提高了胆红素相对于蛋白的吸附选择性。增加胺基和疏水结构有利于胆红素的吸附;羧基不利于胆红素吸附;胆红素吸附还受到配基密度和空间位阻等诸多因素的影响。苯环等空间位阻较大的配基,不利于实际胆红素的吸附,且无法通过提高配基密度而提高其改性膜的胆红素吸附量,而含直链胺配基的己二胺(3-HMD)改性膜的胆红素吸附量随配基密度的提高而提高。     

Adsorption of methyl orange from aqueous solution by composite magnetic microspheres of chitosan and quaternary ammonium chitosan derivative

Novel composite magnetic microspheres containing chitosan and quaternary ammonium chitosan derivative (CHMMs) were prepared by inverse suspension method, and used for the methyl orange (MO) removal from aqueous solutions. The CHMMs were characterized by a scanning electron microscope, a transmission electron microscope, and Fourier transform infrared spectroscopy, respectively. Compared with the chitosan beads, the incorporation of quaternary ammonium chitosan derivative significantly reduced the particle size. The MO adsorption by CHMMs was investigated by batch adsorption experiments. The adsorption kinetics was conformed to the pseudo second-order kinetics equation. The adsorption isotherm followed the Langmuir model better than the Freundlich model and the calculated maximum MO adsorption capacity was 266.6 mg·g^-1 at 293 K. Thermodynamic studies indicated that the MO adsorption was endothermic in nature with the enthalpy change (ΔH°) of 99.44 kJ·mol^-1. The CHMMs had a stable performance for MO adsorption in the pH range of 4-10, but high ionic strength deteriorated the MO removal due to the shielding of the ion exchange interaction. A 1 mol·L^-1 NaCl solution could be used to regenerate the exhausted CHMMs. The proposed CHMMs can be used as an effective adsorbent for dye removal or recovery from the dye wastewater.     

Adsorption of Divalent Cobalt from Aqueous Solution onto Chitosan–Coated Perlite Beads as Biosorbent

Abstract

Chitosan coated perlite beads are prepared by drop‐wise addition of a liquid slurry containing chitosan and perlite to an alkaline bath. The resulting beads are characterized using FTIR, SEM, EDXRF, and Surface area analysis and the chitosan content of the beads is 23% as determined by a pyrolysis method. Adsorption of Co (II) metal ions from aqueous solution on chitosan coated perlite beads is studied under both equilibrium and dynamic conditions. In the present investigation, a first order reversible rate equation is used to understand the kinetics of metal removal and to calculate the rate constants at different initial concentrations. The equilibrium characteristics of metal ion on newly developed biosorbent are studied and the experimental adsorption data are well fitted to Freundlich and Langmuir adsorption isotherm models and the model parameters are evaluated. The effect of pH, agitation time, concentration of adsorbate, and amount of adsorbent on the extent of the adsorption are investigated. The sorbent loaded with metal is regenerated with 0.10 mol dm^?3 sodium hydroxide solution. The adsorption desorption cycles indicated that the chitosan coated perlite could be regenerated and reused to remove Co (II) from waste water.     

泡沫镍生产中电镀液净化工艺

研究了泡沫镍生产中时间、温度、pH及活性炭用量对电镀液净化工艺中吸附平衡时COD的影响。实验结果表明:只需1 h活性炭对有机物的吸附就可达到平衡;温度升高,有机物脱除率下降;pH为2时,吸附效果最好;活性炭添加量为10~25/L时,去除效果最佳。在最佳实验条件下,可以使电镀液中有机物杂质的脱除率达70%以上。     

Preparation of polyamidoamine dendrons supported on chitosan microspheres and the adsorption of bilirubin

The aim of this study was to prepare a new adsorbent for bilirubin (BR); low generation (G, G ≤4) hexanediamine‐containing polyamidoamine (PAMAM) dendrons were supported on chitosan (CS) microspheres (CS‐Gn, n = 0,1,2,3,4). The adsorption properties of this novel adsorbent for BR in aqueous solution were examined. The adsorption percentages were over 70% at 0.5 h and over 90% at 1 h. The adsorption capacity was up to 43 mg/g and was not yet saturated. The BR adsorption increased with increasing temperature and increasing BR initial concentration and was the highest at pH 7.4; it decreased slightly with increasing ionic strength and occurred even in the presence of bovine serum albumin (BSA). We observed that the CS–Gn microspheres had satisfactory competitive abilities with BSA, although the adsorption percentage decreased a certain extent in the presence of BSA. In addition, the CS–Gn microspheres were easier to prepare than the usual PAMAM dendrimers. In summary, this adsorbent is a promising biomedical material for BR removal for artificial liver supported systems. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

羧酸型离子交换纤维对卡那霉素的吸附

测定了羧酸型离子交换纤维吸附卡那霉素的动力学曲线和吸附等温线,并研究了温度、pH值、盐浓度对吸附卡那霉素的影响. 研究结果表明,羧酸型离子交换纤维吸附卡那霉素在10 min达到平衡,其吸附平衡行为可用Langmuir方程描述;在pH 7时,羧酸型离子交换纤维吸附卡那霉素的静态交换容量为最大,可达5.6′104 U/g;羧酸型离子交换纤维吸附卡那霉素随温度变化很小;NaCl的存在使羧酸型离子交换纤维对卡那霉素的交换容量减小;对发酵液中卡那霉素的动态交换容量为5.16′104 U/g,洗脱率为88.1%.