交联壳聚糖微球树脂对Cu(Ⅱ)吸附性能研究

采用反相悬浮法,以戊二醛为交联剂,以环己烷为致孔剂制备交联壳聚糖微球树脂(CCMR);通过静态吸附试验研究树脂对Cu(Ⅱ)的吸附行为。利用金相显微镜和比表面积仪对交联壳聚糖微球树脂(CCMR)的表观形貌和比表面积进行表征;通过紫外可见光谱考察了Cu(Ⅱ)初始浓度对吸附性能影响,研究其吸附动力学。结果表明,随着致孔剂用量的增加,交联壳聚糖微球树脂比表面积增大,吸附性能增强,其中添加环己烷100 m L,乙酸乙酯5 m L制备交联壳聚糖微球树脂对浓度为8 mg/m L的Cu(Ⅱ)溶液的平衡吸附容量可达190 mg/g,吸附性能较好,吸附过程符合准二级吸附动力学模型。     

壳聚糖/明胶复合微球的制备及吸附性能研究

以壳聚糖和明胶为原料,span 80为乳化剂,戊二醛为交联剂,采用乳化交联法制备了壳聚糖/明胶复合微球并用于Cr(Ⅵ)的吸附。考察了复合微球的各制备因素对微球形貌的影响,通过单因素分析研究了壳聚糖与明胶的比例、乳化剂用量、乳化时间对复合微球吸附性能的影响。结果表明,壳聚糖与明胶的比例为1∶2、span80用量为6mL、乳化时间为50min时,制备的复合微球对Cr(Ⅵ)的吸附性能良好,吸附量较大,Cr(Ⅵ)的去除率可达95.3%。     

羧化改性壳聚糖微球的制备及吸附硝基酚的性能

采用反相悬浮环氧氯丙烷交联、氯乙酸羧甲基化制备交联羧化壳聚糖微球,用红外光谱和扫描电镜对微球进行表征,并用于2,4-二硝基苯酚的吸附研究。考察了吸附时间、溶液pH值、酚的浓度和NaCl等因素对2,4-二硝基苯酚吸附的影响。结果表明,羧化改性交联壳聚糖微球具有较好的耐酸碱性能,对2,4-二硝基苯酚有良好的吸附性能,在pH值为3.6条件下,吸附在瞬间就能达到平衡,吸附量达230 mg.g-1,吸附符合Freundlich等温方程。     

交联壳聚糖树脂的制备及其对Cu~(2+)吸附性的研究

以壳聚糖为原料,制成壳聚糖微球,再经过环氧氯丙烷交联得到羟丙基氯壳聚糖微球。实验研究了2.8%壳聚糖醋酸溶液,致孔剂20%无水乙醇,15%氢氧化钠,壳聚糖与环氧氯丙烷质量比为2∶1,反应θ为50℃,反应t为4 h,得到最好的羟丙基氯壳聚糖微球。当溶液pH=6时,振荡θ为30℃,振荡t为60 min,对Cu2+有最大吸附量。     

交联壳聚糖多孔微球吸附亮绿的研究

利用液体石蜡作有机分散介质,戊二醛作交联剂,制备了交联壳聚糖多孔微球,采用SEM对壳聚糖微球的形貌、大小进行了表征,研究交联壳聚糖微球对亮绿的吸附性能,探讨交联壳聚糖多孔微球用量、亮绿初始浓度、pH值、吸附时间、吸附温度的影响.结果表明,室温下,交联壳聚糖微球粒径为0.5～1.0 mm,亮绿初始浓度10 mg·L-1,pH=6,振摇30 min时,吸附量达1.22 mg·g-1;CODCr去除率达73%.亮绿初始浓度越大,吸附量越大,吸附速率越大;吸附剂用量越大,平衡吸附量越小,吸附速率越大.交联壳聚糖微球对亮绿具有很高的吸附容量和较快的吸附速率,再生重复使用,其脱色率仍达90%以上.等温吸附较好符合Freundlich方程.     

季铵盐改性壳聚糖微球对含铬废水的吸附性能

用2,3-环氧丙基三甲基氯化铵对壳聚糖进行改性得到壳聚糖季铵盐,进一步通过乳化交联法合成壳聚糖季铵盐微球,采用傅里叶变换红外光谱（FT-IR）、差热热重分析（TG-DTG）、X-衍射衍射（XRD）和扫描电镜（SEM）对其进行表征分析。此外,研究了壳聚糖季铵盐的浓度、油水比、交联剂用量对合成的壳聚糖季铵盐微球吸附Cr(Ⅵ)性能的影响,并考察了重铬酸钾初始浓度、pH值、壳聚糖季铵盐微球添加量对Cr(Ⅵ)吸附效果的影响。结果表明：HACC浓度为0.8%(w/V)、油水比为8∶1、壳聚糖季铵盐与交联剂质量比为1.64的条件下,可以制备出球型圆整、分散性好的壳聚糖季铵盐微球。在酸性条件和较低浓度的重铬酸钾均有利于壳聚糖季铵盐微球对Cr(Ⅵ)的吸附。     

Cu2+印迹交联壳聚糖微球的合成及吸附性能

利用分子印迹技术,以壳聚糖(CS)为功能单体,Cu~(2+)为印迹离子,通过稀氨水固化、环氧氯丙烷交联、盐酸洗脱Cu~(2+),制得了Cu~(2+)印迹交联壳聚糖微球(Cu~(2+)-ICM)。采用FTIR、XRD和FESEM对产品进行了表征,并测定了微球的骨架密度、含水量和交联度。结果表明:交联改性可使微球具有多孔结构和良好的结构稳定性,能够很好地降低CS的酸溶性,提高微球对Cu~(2+)的吸附性能。通过正交实验L_9(3~4)得到Cu~(2+)-ICM的最优制备条件为:CS 1.5 g,环氧氯丙烷2.5 mL,80℃下交联3.0 h,制得的微球对Cu~(2+)吸附量为67.80 mg/g。在单组分体系中考察了微球对Cu~(2+)的吸附性能。结果表明:当微球投加量为50 mg,Cu~(2+)初始质量浓度为338.7 mg/L,pH=5.0时,吸附量为72.80 mg/g。     

壳聚糖交联微球的制备及其对重金属离子的吸附作用

采用碱解法制备出高脱乙酰度的壳聚糖,再采用戊二醛或环氧氯丙烷对壳聚糖进行交联制得多孔交联微球。结果表明:环氧氯丙烷比戊二醛更适宜作为壳聚糖的交联剂,交联微球对Cu²⁺、Ni²⁺、Cd²⁺的吸附容量受金属离子初始浓度、吸附时间和溶液pH值的影响,其关系为:Cd²⁺>Cu²⁺>Ni²⁺。     

交联壳聚糖对废水中Cu2+的吸附性能

以壳聚糖为原料制备交联壳聚糖吸附剂,并将其用于吸附废水中的Cu2+,考察了交联剂的用量、溶液中Cu2+初始浓度、pH、温度和时间等对交联壳聚糖吸附性能的影响。结果表明,壳聚糖与交联剂的用量比为m(壳聚糖)∶V(甲醛)∶V(戊二醛)=1.5g∶6mL∶4.5mL、溶液pH为6,溶液中Cu2+初始浓度为5mmol/L时吸附效果最佳,且吸附量随着温度升高而增加,吸附表现为吸热过程。     

交联壳聚糖微球的制备及其对不同pH有机染料的吸附性能

本文以壳聚糖为原料,戊二醛为交联剂,采用乳化交联法制备了交联壳聚糖微球。并通过红外光谱仪(FT-IR)、X射线衍射仪(XRD)、扫描电镜(SEM)对壳聚糖和交联壳聚糖微球的结构与形貌进行表征,使用紫外/可见分光光度计测试了甲基橙溶液的吸收波长及吸光度。主要研究了不同p H条件下交联壳聚糖微球对甲基橙溶液的吸附脱色效果。结果表明:交联壳聚糖微球形状规则、表面光滑,其粒径为100μm左右;当甲基橙溶液p H值为3时,吸附速率最快;动力学研究结果表明该吸附过程符合准二级吸附动力学方程模型。     

锰氧化物改性壳聚糖的制备及其吸附汞的研究

文章通过将在锰盐中浸泡过的壳聚糖与氢氧化钠反应制备得到锰氧化物修饰壳聚糖吸附剂。扫描电子显微镜及红外光谱用来表征所得复合物。该复合物的吸附性能通过汞吸附实验获得。吸附动力学实验结果表明:吸附在120分钟可达到平衡。     

壳聚糖吸附剂的制备及性能

通过以壳聚糖为原料,经交联、羟丙基氯化及胺基化,制备了壳聚糖胺基吸附剂。经红外光谱和扫描电镜测定其结构,研究了不同的胺化试剂及其用量对壳聚糖吸附剂胺基含量的影响及对中药液中黄酮化合物的吸附性能。结果表明,改性壳聚糖微球胺基含量比壳聚糖高,对游离黄酮的吸附量随着胺基含量增加而增加。     

改性壳聚糖加碘膜的制备与表征

壳聚糖(CTS)和水杨醛、环氧氯丙烷交联制备壳聚糖衍生物(RS-CTS-E),并制备相应衍生物的凝胶膜,将凝胶膜浸没在一定浓度碘乙醇溶液中,制备改性壳聚糖加碘膜(RS-CTS-E-I2),并对其进行了IR、SEM等表征。碘含量分析表明:改性壳聚糖凝胶膜对单质碘吸附量随碘乙醇溶液浓度增加而增大。碘吸附动力学结果表明其平衡吸附时间为6 h。抑菌性测试结果表明,w(I2)=19.05%时RS-CTS-E-I2膜对金黄色葡萄球菌抑菌环和大肠杆菌抑菌环的抑菌环直径分别为(31±1)mm和(30±1)mm,均为高度敏感。     

Synthesis of Crosslinked Chitosan Possessing Schiff Base and Its Use in Metal Removal

A chitosan resin derivatized with Schiff bases was synthesized by using a crosslinked chitosan (CCTS) as base material. We first synthesized N-benzylidene chitosan (CTB) by the reaction of benzaldehyde with chitosan. After this reaction crosslinking was carried out in the usage of epichlorohydrine (ECH) as a crosslinking agent. The Schiff base was removed by reacting diluted ethyl alcohol hydrochloride solution to give crosslinked chitosan (CCTS).The CCTS was suspended in a mixture of ethyl alcohol/deionized water followed by the addition of epichlorohydrine and by this way crosslinked chitosan-epichlorhydrine (CCTS-ECH) resin was synthesized. After the reaction was completed, the product was filtered, washed with ethyl alcohol and deionized water and dried in vacuum. The two novel polymeric ligands (CCTS-ECH-DHSalophen and CCTS-ECH-DHDPE) were synthesized by the reaction of CCTS-ECH with N,N??-bis(2,5 dihydroxybenzylidene)-1,2-diaminobenzene (DHSalophen), and N,N??-bis(2,5 dihydroxybenzylidene)-4,4??-diaminodiphenylether (DHDPE). The structures of the ligands were characterized by elemental analysis, infrared spectroscopy(FT-IR), scanning electron microscopy(SEM) and thermogravimetric analysis (TGA/DTA). Adsorption experiments (pH dependency, kinetics, and equilibrium) of compounds toward Cr(VI) from waste water were carried out at 25?°C.     

壳聚糖接枝高分子絮凝剂（CAS）处理垃圾渗滤液研究

以壳聚糖（简称CTS）、丙烯酰胺（简称AM）和丙烯酸乙酯季铵盐（简称SMC）为原料,合成了壳聚糖接枝三元共聚高分子絮凝剂简称（CAS）;将其应用于垃圾渗滤液的处理,CODCr的去除率达到58.7％,色度脱除率达到98．1％,且具有pH适用范围广和产污泥量小的优点,对絮凝垃圾渗滤液前后颗粒的粒径分布测定表明,颗粒增大了357倍,且呈正态分布。     

含硫改性壳聚糖气凝胶的合成及对Cu2+吸附的研究

以壳聚糖和二硫代二丙酸二甲酯为原料,通过乙酰化改性,成功制备了壳聚糖衍生物。然后以壳聚糖/壳聚糖衍生物为原料,过硫酸钾为引发剂,N,N'-亚甲基双丙烯酰胺为交联剂,合成了壳聚糖气凝胶/壳聚糖衍生物气凝胶。通过红外光谱（FT-IR）、X射线衍射（XRD）和热重分析（TG）研究了壳聚糖/壳聚糖衍生物的结构性能;同时采用扫描电镜（SEM）对壳聚糖气凝胶/壳聚糖衍生物气凝胶的形貌进行了表征;并且探究了壳聚糖气凝胶/壳聚糖衍生物气凝胶对Cu²⁺的静态吸附实验。FT-IR结果表明壳聚糖衍生物被成功地合成;XRD和TG分析表明相较于壳聚糖,壳聚糖衍生物的结晶度和热稳定性均降低;SEM显示衍生物气凝胶的孔的数量增多。吸附实验结果表明壳聚糖衍生物气凝胶的吸附性能有了较大提高;在25℃,吸附剂添加量50.0mg且Cu²⁺溶液初始质量浓度100mg/L,pH值5时,壳聚糖衍生物气凝胶在60min时达到吸附平衡,最大吸附量为48.26mg/g,比未改性的壳聚糖气凝胶的吸附量提高了63.37%。     

Chitosan Schiff base as eco-friendly inhibitor for mild steel corrosion in 1 M HCl

In the present study, natural biopolymer chitosan was modified into its Schiff base derivative with salicylaldehyde by condensation method. The prepared chitosan salicylaldehyde Schiff base was characterized using ultraviolet spectroscopy, fourier transform infrared spectroscopy, scanning electron microscope and elemental analysis. Thermal analysis was also carried out to determine the thermal stability of the derivative. To explore the corrosion inhibition performance of the chitosan Schiff base, weight loss, and electrochemical techniques were conducted. The inhibitor reduces the metallic corrosion by adsorbing on to the metal surface. The adsorption of chitosan Schiff base on mild steel surface in 1 M HCl follows Temkin isotherm model. Thermodynamic parameters of adsorption and corrosion process were calculated, which revealed the chemical nature of adsorption. SEM and energy dispersive X-ray spectroscopic analysis confirmed the formation of protective chitosan derivative layer on the mild steel surface.     

Heterocyclic modification of chitosan for the adsorption of Cu (II) and Cr (VI) ions

A heterocyclic modification of chitosan has been attempted for development of an effective adsorbent material for removal of metal ions. The modified polymer was characterized using infrared (IR) spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS) and x-ray diffraction (XRD) techniques. The adsorption capacity exhibited for Cu (II) and Cr (VI) were 83.75 and 85.0 mgg^?1, respectively, which is a significant improvement over chitosan. The adsorption on the modified polymer was a second-order kinetic process and followed Langmuir isotherm model. The thermodynamic analysis indicated exothermic and spontaneous nature of adsorption. About 80% of the adsorbed metal ions were desorbed in appropriate stripping solutions indicating reusability.     

活性白土/壳聚糖复合物吸附剂对果汁的澄清作用研究

利用简便的方法制备了活性白土/壳聚糖复合物吸附剂,并通过红外光谱(FT-IR)、热重(TG)、X-射线衍射(XRD)和透射电镜对所制备的吸附剂进行表征.结果表明,壳聚糖嵌入到活性白土的片层结构中,形成了稳定的复合结构,进而增大了活性白土的片层间距,有利于提高活性白土的吸附性能.活性白土/壳聚糖复合物作为吸附剂,对草莓汁、西瓜汁、橙汁均具有较好的澄清效果.对草莓汁澄清条件为:吸附剂用量为0.02 g,35℃、吸附时间1.5h、pH 5,澄清度为69.36％;对西瓜汁的澄清条件为:吸附剂用量为0.02 g,25℃、吸附时间1.5h、pH 6,澄清度达到98.42％;对橙汁的澄清条件为:吸附剂用量为0.02 g,30℃、吸附时间1h、pH 6,澄清度为61.08％.