Preparation and application of glycidyl methacrylate and methacrylic acid monomer mixture‐grafted poly(ethylene terephthalate) fibers for removal of methylene blue from aqueous solution

A novel fibrous adsorbent that grafts glycidyl methacrylate (GMA) and methacrylic acid (MAA) monomer mixture onto poly(ethylene terephthalate) (PET) fibers was used for removal of methylene blue (MB) in aqueous solutions by a batch equilibration technique. The operation parameters investigated included, pH of solution, removal time, graft yield, dye concentration, and reaction temperature. The adsorption rate of MB is much higher on the MAA/GMA‐grafted PET fibers than on the ungrafted PET fibers. MB was removed 99% the initial dye concentration at 10 mg L⁻¹ and 93% at 200 mg L⁻¹ by monomers mixture‐grafted PET fibers. Pseudofirst order and pseudosecond order kinetic equations were used to examine the experimental data of different graft yield. It was found that the pseudosecond order kinetic equation described the data of dye adsorption on fibrous adsorbent very well. The experimental isotherms data were analyzed using Langmuir and Freundlich isotherm models. The data was that Freundlich isotherm model fits the data very well for the dyes on the fibers adsorbent. The dye adsorbed was easily desorbed by treating with acetic acid/methanol mixture (50% V/V) at room temperature. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Structure and properties of tussah silk fibers graft-copolymerized with methacrylamide and 2-hydroxyethyl methacrylate

Tussah silk fibers were graft-copolymerized with methacrylamide (MAA) and 2-hydroxyethyl methacrylate (HEMA) in aqueous media, using a chemical redox system as an initiator. High weight gain values were obtained with both grafting agents (up to 175%). The extent of homopolymerization was negligible for the MAA grafting system over the entire range of monomer–silk ratios examined, while polymer deposition on the fiber surface occurred when the HEMA–silk ratio exceeded 0.5% (w/w). The moisture content of poly(MAA)-grafted silk fibers was enhanced by grafting. Breaking load, elongation at break, and energy decreased at low weight gain (0–20%) and then remained rather constant. The DSC curves of poly(MAA)-grafted silk showed a new endotherm at about 280°C, due to the melting of poly(MAA) chains. The loss modulus peak of poly(HEMA)-grafted silk fibers broadened and shifted to a lower temperature, showing a tendency to split into two peaks at high weight gain. On the other hand, grafting with poly(MAA) induced a noticeable upward shift of the loss peak. The TMA curves showed that grafting with poly(MAA) resulted in a higher extent of fiber contraction from room temperature to about 250°C. Moreover, the intensity of the final contraction step at about 350°C decreased with increasing weight gain and shifted to a lower temperature. The Raman spectra of grafted fibers were characterized by overlapping of the characteristic lines of both silk fibroin and polymer, the latter showing an intensity proportional to the amount of weight gain. Among the conformationally sensitive vibrational modes of tussah silk fibroin, the amide III range was significantly modified by grafting with both poly(MAA) and poly(HEMA). © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1393–1403, 1998     

木薯淀粉磁性微球的结构表征及其对溶菌酶的吸附性能

磁性微球是高分子材料与磁性物质通过一定作用复合而成的一类具有特殊功能的磁性高分子微球。以木薯淀粉为原材料,复合共沉淀法制备的改性磁流体Fe₃O₄,采用两步法(化学交联法)制备木薯淀粉磁性微球。利用傅里叶变换红外光谱仪、X射线衍射仪、同步热分析仪、扫描电镜、激光粒度仪、磁天平等对其性能及结构进行表征并研究其对溶菌酶的吸附行为。通过单因素法考察磁性微球用量、溶液pH值、吸附温度、吸附时间对吸附率的影响,并采用准一级动力学模型和准二级动力学模型研究其吸附动力学。结果表明:制备的木薯淀粉磁性微球Fe₃O₄含量为19.71%,D₅₀(中位径)为15.40μm,磁化率为1.571×10^-3cm³/g,形貌规整;在微球用量为1.25g,溶液pH=10,吸附温度为25℃,吸附时间为80min时,微球对溶菌酶的吸附率最高,达到84.67%。以相关系数R²为参考,准二级动力学模型(R²=0.99993)较准一级动力学模型(R²=0.99174)、颗粒内扩散模型(R²=0.69996)能更好描述木薯淀粉磁性微球对溶菌酶的吸附行为。     

Preparation of grafted polytetrafluoroethylene fibers and adsorption of bilirubin

BACKGROUND: A successful hemoperfusion technique requires that the adsorbent for bilirubin should have a high specificity, adsorption capacity and adsorption rate, blood compatibility and no toxicity. Compared with polymer microbeads, polytetrafluoroethylene (PTFE) fibers have many advantages. The aim of the work reported here was to prepare a new polytetrafluoroethylene‐graft‐poly(glycidyl methacrylate)‐block‐polyethyleneimine (PTFE‐g‐PGMA‐b‐PEI) adsorbent for bilirubin based on PTFE fibers by the ⁶⁰Co radiation‐induced graft polymerization of GMA followed by the chemical modification of the epoxy groups on the PTFE‐g‐PGMA fibers with PEI. In addition, the adsorption properties of this novel adsorbent for bilirubin were examined. RESULTS: The highest content of amino groups obtained on the PTFE‐g‐PGMA‐b‐PEI fibers was 1.87 mmol g^?1. The maximum adsorption capacity of the grafted fibers was 9.6 mg g^?1 at pH = 6.5. Bilirubin adsorption on these fibers obeyed the Langmuir model. Also, these fibers possessed the ability to selectively adsorb bilirubin in the presence of bovine serum albumin. CONCLUSION: The PTFE‐g‐PGMA‐b‐PEI fibers have a high adsorption capacity for bilirubin and excellent adsorption properties. In addition, this new adsorbent is inexpensive, easy to prepare and has no toxicity. So the PTFE‐g‐PGMA‐b‐PEI fibers as a biomedical adsorbent are promising for the removal of bilirubin through the hemoperfusion technique. Copyright © 2009 Society of Chemical Industry     

溶菌酶分子印迹聚乳酸微球的制备及吸附性能

以改性聚乳酸微球(MPLA)为载体,以γ-(2,3-环氧丙氧)丙基三甲氧基硅烷为功能单体,以四乙氧基硅烷为交联剂,采用溶胶凝胶方法制备了表面溶菌酶分子印迹改性聚乳酸微球(LZY-MIP-MPLA),采用红外、扫描电镜和粒径测定等方法对LZY-MIP-MPLA进行了表征,优化了制备条件。详细研究了LZY-MIP-MPLA对溶菌酶的吸附性能,考察了pH和NaCl对吸附性能的影响。结果显示,LZY-MIP-MPLA对溶菌酶的吸附能力明显大于非印迹改性聚乳酸微球(NIP-MPLA),达到吸附平衡的时间为200min左右。Scatchard方程的分析表明,印迹孔穴对模板分子的作用是不完全等价的,即存在两类不同的结合位点。LZY-MIP-MPLA对溶菌酶和牛血清白蛋白的分离因子为10.13,说明其对溶菌酶具有较好的选择吸附性能。     

水杨醛接枝壳聚糖的制备及其吸附性能

以壳聚糖和水杨醛为原料,采用超声波辐射技术制备了水杨醛接枝壳聚糖,并用红外光谱对产物的结构进行了表征,同时研究了接枝壳聚糖的吸附性能.结果表明:采用超声波辐射,大大提高了壳聚糖的接枝反应速度.所制得的水杨醛接枝壳聚糖对Cu2 、Cr6 的吸附容量和吸附速度要大于壳聚糖,在25℃下,其对Cu2 、Cr6 的吸附容量分别达到117.84 mg·g-1和58.14 mg·g-1,并且对Cu2 、Cr6 的吸附在1 h内即可达到饱和.     

香草醛接枝壳聚糖的制备及其吸附性能

以壳聚糖和香草醛为原料,乙醇为溶剂,采用超声波辐射技术制备了香草醛接枝壳聚糖,用红外光谱对产物的结构进行了表征,同时研究了接枝壳聚糖的吸附性能。结果表明:采用超声波辐射法,大大提高了壳聚糖的接枝反应速度,反应2 h时接枝率达到32.85%。香草醛接枝壳聚糖对Cr6+、Cu2+的吸附容量和吸附速度大于壳聚糖。在25℃下,它对Cu2+、Cr6+的吸附容量分别达到145.68 mg/g和56.75 mg/g,并且对Cu2+、Cr6+的吸附在2 h内即可达到饱和。     

Preparation and characterization of iron(III) complex of an amino‐functionalized polyacrylamide‐grafted lignocellulosics and its application as adsorbent for chromium(VI) removal from aqueous media

The growth and decay processes of optically induced birefringence in two novel azobenzene compounds [one was a hyperbranched poly(aryl ether) containing azobenzene groups, and the other was a hydrogen‐bonded complex] were studied. The temperature dependence of the birefringence signal was investigated. The curves for the buildup and decay of birefringence fit well to biexponential functions. The dependence of the fitting parameters on the temperature is also discussed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

NaHCO处理胶乳生产污泥制备吸附剂对阳离子染料的吸附

以胶乳生产厂脱水污泥为原料、1.40mol/L的NaHCO₃作膨胀剂,60℃浸渍并超声处理30min,污泥烘干后再经高温炭化制备吸附剂,将其用于吸附阳离子兰X-GRRL染料溶液,考察炭化温度、炭化时间、吸附剂粒径、吸附剂投加量、吸附时间及溶液pH对吸附效果的影响,并对其吸附动力学和吸附等温线类型进行了探讨。结果表明：污泥在炭化温度700℃、炭化时间120min的条件下,制备的吸附剂（粒径<0.75mm）的比表面积为118.95m²/g,孔隙结构较为发达,对染料溶液吸附效果最佳;在振荡频率150r/min、吸附温度为25℃±0.10℃、初始染料质量浓度为250mg/L、吸附剂投加量为1.20g/L、溶液pH为5.47、吸附时间为300min时,溶液脱色率可达98.30%,染料吸附量为204.80mg/g;其吸附动力学可用准二级动力学方程进行描述;符合Langmuir型吸附等温线,属于单分子层吸附;吸附剂浸出液及吸附处理后的染料溶液的COD值分别为4.00mg/L和20.00mg/L,不会对水体造成二次污染。     

Preparation of comb‐type grafted hydrogels composed of polyacrylamide and chitosan and their use for DNA adsorption

Comb‐type grafted hydrogels composed of polyacrylamide (PAAm) and chitosan (CT) were prepared and used for DNA adsorption. Instead of direct grafting of the acrylamide monomer onto the CT chain, semitelechelic PAAm with carboxylic acid end groups (PAAm–COOH) was synthesized by free‐radical polymerization with mercaptoacetic acid as the chain‐transfer agent, and it was grafted onto CT with amino groups. The synthesis of telechelic PAAm–COOH and the formation of comb‐type grafted hydrogels were confirmed by attenuated total reflectance/Fourier transform infrared spectroscopy and scanning electron microscopy measurements. The prepared comb‐type grafted hydrogels were used as sorbents in DNA adsorption experiments conducted at +4°C in a tris(hydroxymethyl)aminomethane/ethylenediaminetetraacetic acid solution of pH 7.4. DNA adsorption capacities as high as 2.0 × 10³ μg of DNA/g of dry gel could be achieved by the comb‐type hydrogels with higher PAAm contents. This value was approximately 6 times higher than that of CT alone. In addition, the comb‐type hydrogels showed a high adsorption/desorption rate depending on the PAAm content in the hydrogel. As a result, these comb‐type hydrogels carrying higher amounts of DNA may be considered good candidates for achieving higher removal rates for anti‐DNA antibodies and for effective gene therapy systems. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Preparation of methacrylic acid‐grafted chitin using cerium (IV) ion and its application in adsorbing paraquat

Chitin‐grafted‐poly(methacrylic acid) (chi‐g‐PMAA) was synthesized and characterized as an adsorbent of paraquat. Chi‐g‐PMAA copolymers were prepared using various concentrations of ammonium cerium(IV) nitrate (Ce⁺⁴) to determine the optimal concentration of Ce⁺⁴. Grafting was verified by differential scanning calorimeter thermograms, FTIR, and solid‐state ¹³C‐NMR spectra. A representative chi‐g‐PMAA copolymer was neutralized to a sodium salt (chi‐g‐PMANa) and used to adsorb paraquat. The adsorption equilibrium data are strongly related to both the Langmuir and the Freundlich isotherms. The maximal adsorption capacity is 147.0 mg/g‐adsorbent. This value exceeds those of Fuller's earth and activated carbon, which are the most common binding agents that are currently used for paraquat. The results suggest that chi‐g‐PMANa has potential as a paraquat adsorbent. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Preparation for graft copolymers of sawdust/vinyl monomers and their application for removal of dye

A kind of cationic exchanging resin of carboxyl sawdust (CSD) was fabricated through the hydrolysis of graft copolymers of sawdust with acrylonitrile (SAN) and sawdust with acrylamide (SAA) that were made by initiator Fe²⁺/H₂O₂. A study of the graft copolymerization was conducted for initiator usage, vinyl monomer usage, and reaction temperature. The hydrolysis under basic/acid conditions was also studied for the yield and acid value of CSD followed to adsorb Basic Pink dye (BPD). Our results show the following: (1) graft copolymers (SAN and SAA) with a high rate of graft copolymerization are readily prepared by suitable usages of initiator and vinyl monomer under a certain temperature; (2) adsorption capacity of CSD is relative to pH of BPD solution and reaches the most adsorption capacity at pH ≈ 6; (3) adsorption capacity of CSD increases along with the augment of its acid value; and (4) the adsorption capacity of the CSD toward BPD increases along with augment of initial concentration of the adsorbate and reaches about 500 mg/g. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2390–2396, 2002     

Adsorption of butanol from aqueous solution onto a new type of macroporous adsorption resin: Studies of adsorption isotherms and kinetics simulation

BACKGROUND: Owing to the rapid depletion of petroleum fuel, the production of bio‐butanol has attracted much attention. However, low butanol productivity severely limits its potential industrial application. It is important to establish an approach for recovering low‐concentration butanol from fermentation broth. Experiments were conducted using batch adsorption mode under different conditions of initial butanol concentration and temperature. Batch adsorption data were fitted to Langmuir and Freundlich isotherms and the macropore diffusion, pseudo‐first‐ and second‐order models for kinetic study. RESULTS: The maximum adsorption capacity of butanol onto KA‐I resin increase with increasing temperature, ranged from 139.836 to 304.397 mg g^?1. The equilibrium adsorption data were well fitted by the Langmuir isotherm. The adsorption kinetics was more accurately represented by the macropore diffusion model, which also clearly predicted the intraparticle distribution of the concentration. The effective pore diffusivity (D_p) was dependent upon temperature, but independent of initial butanol concentration, and was 0.251 × 10^?10, 0.73 × 10^?10, 1.32 × 10^?10 and 4.31 × 10^?10 m² s^?1 at 283.13, 293.13, 303.13 and 310.13 K, respectively. CONCLUSION: This work demonstrates that KA‐I resin is an efficient adsorbent for the removal of butanol from aqueous solutions and available for practical applications for future in situ product recovery of butanol from ABE fermentation broth. Copyright © 2012 Society of Chemical Industry     

Synthesis and characterization of polyacrylamide‐grafted coconut coir pith having carboxylate functional group and adsorption ability for heavy metal ions

The present investigation was undertaken to evaluate the effectiveness of a new adsorbent prepared from coconut coir pith (CP), a coir industry‐based lignocellulosic residue in removing metal ions from aqueous solutions. The adsorbent (PGCP‐COOH) having a carboxylate functional group at the chain end was prepared by grafting polyacrylamide onto CP using potassium peroxydisulphate as an initiator and in the presence of N,N′‐methylenebisacrylamide as a crosslinking agent. The adsorbent was characterized by infrared (IR) spectroscopy, thermogravimetry (TG), X‐ray diffraction (XRD) patterns, scanning electron microscopy (SEM), and potentiometric titration. The adsorbent exhibits very high adsorption potential for the removal of Pb(II), Hg(II), and Cd(II) ions from aqueous solutions. The optimum pH range for metal ion removal was found to be 6.0–8.0. The adsorption process follows a pseudo‐second‐order kinetic model. The adsorption capacities for Hg(II), Pb(II), and Cd(II) calculated using the Langmuir isotherm equation were 254.52, 189.49, and 63.72 mg g^?1, respectively. Adsorption isotherm experiments were also conducted for comparison with a commercial carboxylate form cation exchanger. Different industry wastewater samples were treated by the PGCP‐COOH to demonstrate its efficiency in removing heavy metals from wastewater. The reusability of the PGCP‐COOH was also demonstrated using 0.2M HCl. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3670–3681, 2007     

Studies on acrylic acid–grafted polyester fabrics by electron beam preirradiation method. I. Effects of process parameters on graft ratio and characterization of grafting products

Polyester fabrics were preirradiated by electron beam in air and then grafted by acrylic acid (AA) without excluding oxygen. Effects of preirradiation dose, monomer concentration, reaction temperature, storage time, sulfuric acid, and Mohr's salt were investigated in detail and are discussed. The results suggest that it is practicable and effective to graft AA onto polyester fabrics by means of the preirradiation method. FTIR and SEM were used to characterize AA‐grafted polyester fabrics. A new band appearing at 1546 cm^?1 in the FTIR spectrum implies that AA was indeed introduced onto PET macromolecules. Changes of the diameter and the surface structure of fabric fibers presented in SEM micrographs make it clear that a layer of grafted poly(acrylic acid) was formed on the surface of these PET fibers. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3931–3938, 2003     

Biotechnological Potential of Soil Isolate,Flavobacterium mizutaii for Removal of Azo Dyes: Kinetics,Isotherm, and Microscopic Study

Flavobacterium mizutaii has been isolated from soil samples for efficient removal of two azo dyes that is, napthol blue black (Color Index 20470) and direct red 80 (Color Index 35780). The adsorption behaviors of these azo dyes have been investigated in detail to explore the potentiality of F. mizutaii in pollution control management. Effects of various conditions such as pH, temperature, dye concentrations, and incubation time have been studied to optimize the adsorption process. The process is found to be a function of pH of the solution, with the optimum range being pH 1.0–2.0. The results also establish that 405.82 ± 51.4 µmol of napthol blue black and 253.15 ± 31.8 µmol of direct red 80 are adsorbed per gram of F. mizutaii at optimum conditions. FTIR spectroscopic study and functional groups modifications demonstrates different functional groups viz. carboxyl, amine, and phosphate groups of the cell wall components responsible for adsorption of the dyes. AFM along with TEM analysis demonstrates a conspicuous surface morphology change of the dye-adsorbed biomass.

Supplemental materials are available for this article. Go to the publisher's online edition of Separation Science and Technology to view the free supplemental file.     

活性炭纤维的制备及其液相吸附研究-对水溶液中有机物和银的吸附特性

活性炭纤维(ACF)是1种高效而又用途广泛的吸附材料，在环保、食品、化工等领域得到广泛的应用。目前，提高ACF的制备得率，阐明吸附与ACF结构的本质关系，开拓ACF的应用新领域，仍然是人们致力研究而又未能很好解决的问题。本论文围绕ACF的制备及其液相吸附性能，特别是对水中有机物的吸附性能和对银离子的还原吸附特征及其吸附机理，开展了一些基础性研究工作。论文主要包括如下3部分内容 1 ACF的制备及其结构表征 主要采用水蒸汽活化法，并通过前处理及后期氧化改性制备了一系列ACF。系统地研究了碳化-活化温度或时间对ACF的孔结构和化学结构的影响，并用多种方法，包括基于低温氮吸附的DR-法、α,-法、t-法等孔结构的评价方法，X-射线衍射、红外光谱以及X-射线光电子能谱等分析技术系统地表征和比较了这些ACF的结构。揭示了ACF制备的动力学规律，并提出相应的机理。碳化-活化反应是一个对碳为一级反应的过程，该反应需要克服一定的活化能。纤维在碳化过程中形成类石墨微晶的同时，也形成了孔的雏形；而活化过程则使石墨微晶被不断蚀刻和破坏，并在已形成的孔结构的基础上使孔不断扩大。因此，控制碳化反应的最后温度，对于控制ACF的孔发育，具有与控制其它活化条件同等重要的作用。 同时，还归纳了碳化-活化温度可用于控制孔的发育 的一些规律。对于水蒸汽活化制备ACF，低温条件下(800-820)碳化活化，可使得到的ACF含有均一的极微孔；而较高的活化温度(>840℃)，使所得的ACF含有较大比例的超微孔及中孔。 此外，还阐述了用无机氧化剂对剑麻基ACF(SACF)进行后期改性，虽然降低了所得改性ACF(OACF2)的比表面积，但可以改变OACF5的表面化学 结构，有利于改善ACF的化学吸附性能。纤维在碳化前用金属氯化物预处理，可提高了ACF的得率，但该类ACF的比表面积较低。 2 ACF对水溶液中染料的吸附 较深入地研究了ACF对亚甲基蓝、结晶紫、铬蓝黑R、铬黑T、二甲酚橙、溴酚蓝、荧光素等几种染料的静态和动态吸附特征及影响因素，探讨了吸附的热力学和动力学规律。初步阐明了染料在ACF上的吸附机理。染料在ACF上的吸附与吸附剂和吸附质的结构密切相关。由于染料分子的几何尺寸较大，染料分子在ACF上的吸附受孔屏蔽效应的强烈影响。ACF的孔径大小及分布成为决定染料吸附速度和吸附量大小的主导因素。孔径越大，染料的吸附速度越快；而比表面积越高，染料的吸附量也越高。另一方面，ACF表面含氧量的增加，有利于对染料的吸附。碱性阳离子染料比酸性偶氮染料更易于在ACF上吸附。 热力学研究表明，ACF自溶液吸附染料是1个自发过程， G为负值。ACF对亚甲基蓝和结晶紫的吸附为一吸热过程和熵增加的过程。这是由于染料的吸附首先经历了二聚体或多聚体离解的吸热过程所致。提高温度，有利于吸附的进行，其原因是温度升高，使染料的二聚乃至多聚发生离解，减低了ACF的孔屏蔽；同时，也提高了染料的内能，可以克服染料在微孔中扩散所需的能量。至于熵增加的原因，是由于染料的离解和染料替换了ACF表面的水分子的结果。 染料在ACF上的吸附速度随表面覆盖度的升高而降低，并可用简单的Langmuir动力学方程描述。染料的吸附速度决定于染料及ACF的性质，而与染料的初始浓度无关。 3 ACF对有机物和银离子的共吸附 研究了溶液中有机物的存在和ACF表面氧化改性后对活性碳纤维还原吸附银离子的能力的影响。揭示了某些有机物如亚甲基蓝、苯胺等对ACF还原吸附能力的显著促进作用，并初步探讨了其还原吸附机理。溶液中有机物的吸附强烈影响ACF还原吸附Ag(NH3)+2 的能力。溶液中亚甲基蓝的存在可使SACF对Ag(NH3)+2的还原吸附容量提高数倍；溶液中苯胺的存在更显著地提高SACF或OACFs对Ag(NH3)+2的还原吸附容量及还原效率。其它有机物如对硝基苯酚和苯甲酸对ACF还原吸附Ag(NH3)+2的影响，依ACF的不同而不同，但影响程度不大。SACF的氧化改性，提高了产物OACFs对Ag(NH3)+2的还原能力，显示ACF表面化学性质对其氧化还原吸附能力的重要性。 对Ag(NH)+2 在ACF上还原吸附机理的初步分析，显示有机物吸附对ACF还原吸附能力的影响，可能是改变了ACF表面的酸碱环境，或改变了ACF表面的Zeta电位，影响ACF表面的阴极极化程度，从而促进或阻碍了Ag(NH3)+2 在ACF上的还原。 上述研究的结果，为ACF的制备及其结构控制提供了指导依据；为利用染料作为“分子探针”确切评价ACF的液相吸附性能提供了理论基础；为利用ACF的还原能力回收贵金属提供了更有效的方法。这些结果对于环境治理和资源再生，也具有现实和理论上的意义。     

一种硅基介孔材料的制备及其对低浓度Co~（2＋）的选择性吸附

以介孔硅材料MCM-41为基体,采用接枝法设计合成了三类含巯基和胺基的新型吸附材料,通过X射线衍射、Fourier变换红外光谱及N2吸附–脱附实验,对材料的结构进行了表征,探讨了改性剂APTS与MPTMS配比对结构的影响,并对材料Co2＋的吸附性能进行了静态吸附实验。结果表明：APTS与MPTMS的质量比为1：2时制备的吸附材料MA-MCM-2对低浓度Co2＋具有较高的去除率,达到50%以上,好于其他两种;MA-MCM-1和MA-MCM-2等温吸附结果与Langmuir方程及Freundlich方程均能较好地拟合,其饱和吸附容量分别为0.227mmol/g和0.251mmol/g;吸附过程遵循Lagergren准二级动力学方程,Co2＋在MA-MCM-1的吸附过程受液膜扩散和颗粒扩散共同作用,而MA-MCM-2和MA-MCM-3受液膜扩散作用主导。在干扰离子Ca2＋和Mg2＋含量达到200mg/L时,MA-MCM-2对低浓度Co2＋的去除效率仍达到38%,表现出了一定的干扰能力。     

Preparation and adsorption performance of a cellulosic‐adsorbent resin for copper(II)

The adsorbent resin was prepared by grafting copolymerization of acrylic acid and acrylamide onto cellulose under microwave irradiation, and was applied to adsorb copper ions from wastewater. The influences of adsorption time, resin particle size, pH values, and temperature of solution on its adsorption performance were investigated. At the optimal adsorption conditions, adsorption ratio could get to 99.2% and the adsorption capability reached 49.6 mg/g. Furthermore, adsorption theory model was based and study showed that the physical adsorption was dominating and it accorded to Freundlich isotherm model. XPS of adsorbent resin complex was tested, which ensured the chelating groups onto adsorbent surface. Adsorbent resin could be regenerated using 8% NH₃·H₂O, which had good regeneration effect, and experiment showed that adsorption ratio could still keep over 90% when resin was regenerated seven times. So, heavy metal‐ions could be reclaimed from gel resin and the circulation of resources could be realized. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci, 2006