STUDIES ON THE SYNTHESES AND PROPERTIES OFSNAKE-CAGE TYPE CHELATE RESINS I System of Carboxymethyl-chitosan/B-62/Triethylenetetramine

1INTRODUCTIONCarboxymethyl-chitosan(CMXTS)isakindofwatersolublelinearpolymerpreparedfromcarboxymethylationofchitosan(CTS).DuetoitsEDTA-likemolecularstructUre,ithasgoodchelatesorptionpropertiesformetalionslll.However,itiseasytorunoffinwateranddifficulttoberegenerated.Henceitmustbechemicallycross-linkedbeforebeingusedaschelateresin.Thecommonreagentsforcross-linking,suchasepichlorohydrin,chloromethylthiirane['1andpolyethyleneglycoldiglycidylether'],havedifunctionalgroups,whichreactwith'…     

球形壳聚糖树脂制备方法及吸附性能研究

本文采用滴加成球法制备球形壳聚糖树脂,对影响壳聚糖树脂粒径分布的多种因素进行了研究。研究了用戊二醛,环氧氯丙烷及乙二醇环氧丙基醚作交联剂时,不同交联剂对树脂吸附Ｎｉ＾２＋、Ｃｕ＾２＋、Ｚｎ＾２＋的吸附动力学曲线及吸附等温线的影响。研究了ｐＨ值,颗粒粒径、离子强度对吸附容量的影响。     

ADSORPTION SELECTIVITY FOR Cu^2＋,Ni^2＋,Co^2＋IONS USING CROSSLINKING CHITOSAN RESINS IMPRINTED BY METAL IONS

Metal ion-imprintedly crosslinked chitosan resin 1 and resin 2 were prepared by the use of Cu^2+ and Ni^2+ as template ions and glutaraldehyde as crosslinking agent,respectively,Through investigation on the adsorption capacties and binding constants for Cu^2+,Ni^2+ and Co^2+ ions on chitosan resins,resin 1 and resin 2 exhibit the adsorption selectivity for the mixture solution of 1L1 Cu^2+ and Ni^2+ ions.The adsorption selectivity of metal ion-imprinted resins for their template ions in much higher than that of uncrosslinked chitosan resin.     

蛇笼型螯合树脂的合成及性能研究Ⅱ·CMC/B-62/TETA体系

以羧甲基纤维素（ＣＭＣ）、甘油环氧树脂（Ｂ－６２）及三乙烯四胺（ＴＥＴＡ）为基本原料,经脱水交联合成了一种ＣＭＣ的蛇／ＴＥＴＡ交联Ｂ－６２树脂为笼的新型弱酸弱碱型蛇笼树脂。研究了该树脂在不同溶剂中的溶胀性能及对Ｃｕ＾２＋、Ｎｉ＾２＋、Ｐｂ＾２＋的吸附量、吸附动力学、等温吸附过程等静态吸附。同时研究了ｐＨ值等因素对吸附性能的影响。实验结果表明,该树脂在所有溶剂中只溶胀而不流失;其对上述三种金属离子的     

杯芳烃-壳聚糖聚合物的合成与吸附性能

杯芳烃聚合物常常表现出优异的离子选择性识别性能,在离子交换与吸附、离子萃取与分离、离子传感器和离子色谱等方面有较好的应用前景,但这类聚合物的吸附能力一般较低。壳聚糖是甲壳素的脱乙酰衍生物,是具有广泛用途的天然生物高分子材料,其分子内有氨基和羟基,     

磁性功能化酚醛树脂的合成及对金属离子的吸附性能

磁性功能化酚醛树脂的合成及对金属离子的吸附性能;环氧酚醛树脂;螯合;金属离子;溶胀;吸附容量;吸附动力学     

改性壳聚糖的制备及其对金属离子的吸附性能

用对羟基苯甲醛、水杨醛和香草醛对壳聚糖进行了修饰.探讨了产物对微量Hg2+,Pb2+,Au3+,Cu2+,Ag+,Cr3+,Cd2+,Ni2+和Zn2+的吸附性能.结果表明,改性后的壳聚糖具有不易流失、易再生的特点,并且对离子的去除率较高,尤其对Hg2+,Pb2+和Au3+,去除率更高.     

多胺型螯合树脂对Au（Ⅲ）的吸附性能

研究了含有多胺型螯合树脂FQ－34对Au(Ⅲ）的吸附性能。结果表明，该树脂可在Cu^2 ,Ni^2 ,Zn^2 ,Pb^2 等共存离子存在下选择吸附Au( Ⅲ），其吸附选择系数可达98％以上。     

硫代乙酰胺-聚苯乙烯树脂吸附剂制备及其对铅、镉、铜、镍、铁的萃取

以大孔聚苯乙烯苄胺树脂为载体通过Mannich反应制备了一种新型固相萃取吸附剂TAA-PS(硫代乙酰胺改性聚苯乙烯树脂)。利用FTIR和元素分析对其进行表征。研究了其对痕量金属离子的萃取性能,确定了对Pb2 、Cd2 、Cu2 、Ni2 和Fe3 等金属离子的最佳吸附条件。与其它吸附剂相比,本研究合成的固相萃取吸附剂具有高吸附容量和相当快的吸附速率。应用于自来水和湖水中痕量Pb2 、Cd2 、Cu2 、Ni2 和Fe3 的萃取富集,取得较好结果。     

Cu(Ⅱ)模板法合成交联壳聚糖缩合水杨醛螯合树脂

壳聚糖可溶于酸性介质中并发生降解［１］,因此,利用壳聚糖制备螯合树脂时,需进行改性,使之转变为不溶不熔的交联型树脂．但交联后的壳聚糖虽不溶于酸,其吸附能力却比交联前明显降低［２］．模板合成法是制备具有一定“记忆”功能的高分子吸附螯合树脂的一种新方法,...     

O-羧甲基壳聚糖纳米微粒制备及对Ni~(2+)吸附研究

将壳聚糖与氯乙酸反应,通过控制反应条件制备了取代度为0.71的O-羧甲基壳聚糖,将改性后的O-羧甲基壳聚糖与多聚磷酸钠反应,制备了粒径分布在370-710nm的O-羧甲基壳聚糖纳米微粒,透射电镜观察表明该微粒呈球状,平均粒径为450nm.在此基础上研究了O-羧甲基壳聚糖纳米微粒对工业电镀镍废水Ni~(2+)吸附性能,考察了溶液pH、Ni~(2+)起始浓度、平衡吸附时间、粒径等因素的影响,结果表明:O-羧甲基壳聚糖微粒最佳吸附条件是Ni~(2+)溶液pH为8.0、Ni~(2+)溶液起始浓度为33.28mg/ml、平衡吸附时间为0.5h、粒径较小的O-羧甲基壳聚糖纳米微粒对Ni~(2+)的吸附量要大于粒径较大的吸附量.     

纤维素基磁性聚氨肟树脂的研究

用醋酸纤维素包埋γ-Fe_2O_3作磁芯,经过接枝改性,首次合成了纤维素基聚氨肟树脂(MPAO)。实验结果表明,树脂有效地吸附Hg~(2-)、Cu~(2-)、Pb~(2+)、Ni~(2-)等重金属离子,优点是吸附速度快、易洗脱。吸附动力学证明化学反应是吸附速度的决定因素,与树脂吸附层的非交联结构有关。     

壳聚糖与壳寡糖结构及其对放射性核素铀吸附性能

采用酸碱滴定法测定壳聚糖和壳寡糖脱乙酰度分别为90.9%和90.1%,用IR方法表征了壳糖中乙酰基和氨基。 MALDI-FT-MS进一步给出了经葡聚糖凝胶柱纯化后壳寡糖脱乙酰度和聚合度的信息。 通过壳聚糖吸附性能的研究发现,壳聚糖对放射性核素铀具有较强的吸附能力,吸附率达96%以上,即使在大量Cu2+存在情况下,也可高效吸附放射性核素铀,说明壳聚糖有望成为一种新型的放射性核素吸附去污材料。     

PAN-S浸渍树脂对金属Ni~(2+)的吸附性能研究

用1-(2-吡啶偶氮)-2-萘酚-6-磺酸(PAN-S)水溶液处理201×7强碱性阴离子交换树脂,制取了具有PAN-S功能团的PAN-S浸渍树脂.用PAN-S作显色剂测定水相中金属Ni~(2+),建立了分光光度测定方法,并且研究了测试的优化条件以及PAN-S浸渍树脂对金属Ni~(2+)的静态吸附和动力学吸附行为.结果表明,在288～318K和研究的浓度范围内,PAN-S浸渍树脂对金属Ni~(2+)的吸附平衡数据符合Freundlich和Langmuir吸附等温方程,其吸附金属Ni~(2+)为放热过程,适当降低温度有利于吸附.     

强酸型离子交换树脂支载的过渡金属催化剂

过渡金属对有机化学反应有很好的催化作用。随着聚合物支载试剂的出现,对于高分子催化剂的研究十分活跃。聚合物支载的过渡金属催化剂具有较高的催化活性和稳定性,易于分离和重复使用等优点。本文将Co~(2+)、Cu~(2+)、Ni~(2+)等过渡金属离子接于强酸型离子交换树脂上,比较了这几种聚合物支载催化剂对醇和烯醚加成反应的影响。 所用温度计、压力计已经校正。仪器为IR-440型红外光谱仪,固体样品用KBr压片,液体样品用KBr涂片;WC-1型显微测熔仪;GC-16型气相色谱仪,PEG-20m石英毛细管柱,60～     

新型胺基壳聚糖树脂的合成及其对胆红素吸附性能的研究

以壳聚糖为原料，经羟丙基氯化、胺基化，制备了一种新型胺基壳聚糖树脂，研究了该树脂对胆红素的吸附性能。结果表明：胺基壳聚糖树脂的胺基含量比壳聚糖高，该树脂对游离胆红素的吸附在3h基本达到平衡，吸附量随着胺基含量增加而增加，树脂的吸附性能受温度、离子强度影响。胺基壳聚糖树脂对血清白蛋白结合胆红素的吸附量大于壳聚糖，但低于对游离胆红素的吸附。     

球状壳聚糖负载噻二唑树脂的合成及其吸附性能

用苯甲醛保护胺基后,将2-氨基-5-巯基-1,3,4-噻二唑引入到大孔壳聚糖微球上,合成了亲水性的多孔球状吸附树脂(CTS-AMT)。 对比研究了CTS-AMT和母体微球(CTS)对Zn2+、Cu2+、Cd2+、Pb2+、Ag+和Hg2+的吸附性能。 结果表明,pH=5.0,T=298.15 K时,CTS-AMT树脂对上述金属离子的吸附在1.5 h内基本达到平衡,对金属离子Hg2+、Ag+和Pb2+的静态饱和吸附量分别为2.54、2.31和1.71 mmol/g。 在实验浓度范围内该树脂对Hg2+的吸附过程符合 Langmuir等温吸附模型。     

Surface and biological activity of sophorolipid molecules produced by Wickerhamiella domercqiae var. sophorolipid CGMCC 1576

The ion-imprinted magnetic chitosan resins (IMCR) prepared using U(VI) as a template and glutaraldehyde as a cross-linker showed higher adsorption capacity and selectivity for the U(VI) ions compared with the non-imprinted magnetic chitosan resins (NIMCR) without a template. The results showed that the adsorption of U(VI) on the magnetic chitosan resins was affected by the initial pH value, the initial U(VI) concentration, as well as the temperature. Both kinetics and thermodynamic parameters of the adsorption process were estimated. These data indicated an exothermic spontaneous adsorption process that kinetically followed the second-order adsorption process. Equilibrium experiments were fitted in Langmuir, Freundlich, and Dubinin-Radushkevich adsorption isotherm models to show very good fits with the Langmuir isotherm equation for the monolayer adsorption process. The monolayer adsorption capacity values of 187.26 mg/g for IMCR and 160.77 mg/g for NIMCR were very close to the maximum capacity values obtained at pH 5.0, temperature 298 K, adsorbent dose 50 mg, and contact time 3 h. The selectivity coefficient of uranyl ions and other metal ions on IMCR indicated an overall preference for uranyl ions. Furthermore, the IMCR could be regenerated through the desorption of the U(VI) ions using 0.5 M HNO(3) solution and could be reused to adsorb again.     

壳聚糖缩合呋喃甲醛螯合树脂的合成及性能研究

利用壳聚糖C2 位上活泼氨基与呋喃甲醛缩合反应 ,合成了一种新型树脂。通过L9(34 )正交试验 ,研究了缩合反应的最佳条件 :80℃乙醇中溶胀 1h ,反应 5h ,pH =4.0～ 4.5 ,反应物配比 (氨基摩尔∶醛基摩尔 )为 1∶4,缩合率达到 90 %以上。并测定了上述螯合树脂对过渡金属离子的吸附性能。     

Functionalization of chitosan with 3-nitro-4-amino benzoic acid moiety and its application to the collection/concentration of molybdenum in environmental water samples

A chitosan resin functionalized with 3-nitro-4-amino benzoic acid moiety (CCTS-NABA resin) was newly synthesized for the collection/concentration of trace molybdenum by using cross-linked chitosan (CCTS) as base material. The carboxyl group of the moiety was chemically attached to amino group of cross-linked chitosan through amide bond formation. The adsorption behavior of molybdenum as well as other 60 elements on the resin was examined by passing the sample solutions through a mini-column packed with the resin. After the elution of the elements collected on the resin with 1 M HNO₃, the eluates were analyzed by inductively coupled plasma-mass spectrometry (ICP-MS) and atomic emission spectrometry (ICP-AES).

The CCTS-NABA resin can adsorb several metal ions, such as vanadium, gallium, arsenic, selenium, silver, bismuth, thorium, tungsten, tin, tellurium, copper, and molybdenum at appropriate pHs. Among these metal ions, only molybdenum could be adsorbed almost completely on the resin at acidic regions. An excellent selectivity toward molybdenum could be obtained at pH 3–4. The adsorption capacity of CCTS-NABA resin for Mo(VI) was 380 mg g⁻¹ resin. Through the column pretreatment, alkali and alkaline earth metals in river water and seawater samples were successfully removed.

The CCTS-NABA resin was applied to the adsorption/collection of molybdenum in river water and seawater samples. The concentrations of molybdenum in river water samples were found in the range of 0.84 and 0.95 ppb (ng g⁻¹), whereas molybdenum in seawater was about 9 ppb. The validation of the proposed method was carried out by determining molybdenum in the certified reference materials of SLRS-4, CASS-4, and NASS-5 after passing through the CCTS-NABA resin; the results showed good agreement with the certified values.