聚苯乙烯磺酰基硫脲树脂的合成及其对金离子的螯合性能

本文通过交联聚苯乙烯磺酰氟与硫脲反应制得聚苯乙烯磺酰基硫脲树脂(1)。树脂1对Au~(3+)的吸附容量最高达771mgAu~(3+)/g树脂。吸附在树脂上的全离子可以用硫脲的酸性溶液洗脱,回收率达95.3％。     

偕胺肟螯合纤维的合成及对矿液中金的吸附性能研究

螯合离子交换纤维在吸附金属离子时具有选择性高、吸附速度快、易解脱和容易再生等优点[1 4]。本文制备了一偕胺肟螯合纤维,测定了它的机械性能及对模拟金矿液和实际金矿液(水氯法)中金的静、动态吸附性能,考察了共存离子浓度高于实际矿液中浓度几倍至几十倍时对金的吸附选择性。对实际金矿液静态饱和吸附为58 5mg/g,在流速为每分钟1 5个柱床体积的动态实验中,当吸附容量在29 2mg/g以下时,动态吸净率保持在73%以上。1　实验部分1 1　仪器和试剂INSTRON 4465型万能材料试验机(温度为60℃,湿度为60%,拉伸速度为10 00mm/min,计算机采点…     

螯合吸附分离功能纤维的研究进展

螯合纤堆是一类能与金属离子形成多配位络合物的纤堆状吸附功能材料,是近年来发展起来的一种新型离子交换纤堆,具有吸附选择性高、易洗脱、容易再生等优点。综述了近年来螯合纤堆的制备方法及种类,对其螯合机理进行了探讨,概括了该纤堆的应用范围并指出了其应用前景。     

纤维状吸附、分离材料的进展

本文简要地阐明了纤维状吸附、分离材料,其中包括活性碳纤维(ACF)、离子交换纤维(IEF)和螫合纤维(CLF)近年来的发展,它们的基本性质、制备方法和应用。尤其是在环境保护、贵金属的分离、回收等方面的应用前景。文中扼要地介绍了本文作者近年来发现的活性碳纤维和某些螯合纤维的氧化一还原特性。这类纤维在吸附某些高价态金属离子的同时可以把它们还原成低价态或金属元素。     

金离子的活性炭吸附及微波解吸

金离子的活性炭吸附及微波解吸杨春芬，王光灿（云南大学化学系实验中心昆明６５００９１）关键词金，硫脲，吸附，微波解吸用硫脲浸出法提取金、银具有速度快、毒性小，再生净化工序简单等优点￣［１］．用活性炭自硫腺浸金溶液中吸附金是极为有效的方法，但吸附后不易洗...     

双硫腙螯合形成树脂分离富集地质样品中的微量金,铂,钯及其测定

研究了双硫腙螯合形成树脂的合成及其分离富集地质样中Ａｕ，Ｐｔ，Ｐｄ的条件。于ｐＨ１．５的ＨＣｌ介质中，Ａｕ，Ｐｔ，Ｐｄ定量吸附于Ｈ２ＤＺ形成树脂上与大量贱金属分离。用０．６ｍｏｌ／Ｌ的硫脲－０．１ｍｏｌ／ＬＨＣｌ洗脱贵金属，回收率均在９４％－１０６％之间。铁也部分上柱，用磺基水杨酸与酒石酸１：１联合掩蔽除去。     

乙二胺改性聚氯乙烯大孔螯合树脂富集分离微量金, 铂, 钯, 铱的性能和机理研究

本文利用ICP化学光谱法对自合成的聚乙烯乙二胺大孔螯合树脂富集分离微量金、铂、钯、铱进行了研究。讨论了螯合树脂对各微量元素的富集性能、吸附速率和富集机理,并进行了样品的分析,获得了较满意的结果。     

2-HBR负载树脂分离富集金的研究及其分析应用

本文探讨了２－羟基苄叉罗丹宁（２－ＨＢＲ）负载树脂对金的吸附性能及用ＡＡＳ吸附金的酸效应、吸附动力学、吸附机理、吸附热力学、动态试验等。     

泡沫塑料动态快速分离富集金方法的研究

本文系统研究了泡沫塑料动态快速分离富集金的方法。对泡沫塑料柱的处理方法,再生及主要共存离子干扰的消除等均做了较详细的研究。提出了一种简便,不控速的金分离富集的方法。该法用于分析0.051～3.59g/t四种不同含量的金标样,结果与推荐值吻合,5次分析结果,相对标准偏差<5％,同时,可用泡沫塑料柱当天连续使用分析拿标样,回收率为93％—109％。     

用Amberlyst A—26树脂分离金,钯,铂的研究

本文用ＡｍｂｅｒｌｙｓｔＡ－２６大孔阴离子交换树龙分离及用ＴＭＫ分光光度法分别与同时测定金，钯，铂。研究酸度，流速，离子浓度，淋洗剂的选择，共存离子的干扰情况并应用于矿样的分析，得到满意的测定结果。     

两性离子交换纤维柱富集-电感耦合等离子体原子发射光谱法测定水样中稀土元素

提出了两性离子交换纤维柱吸附富集镧、钕、铕、钆、铒和镱,1.5mol·L~(-1)硝酸溶液作洗脱剂,电感耦合等离子体原子发射光谱法测定水样中上述痕量稀土元素含量的方法。在优化的试验条件下,两性离子交换纤维柱对镧、钕、铕、钆、铒和镱的吸附容量分别为7.32,7.61,8.04,7.95,9.12,8.49 mg·g~(-1);镧、钕、铕、钆、铒和镱的检出限(3S/N)分别为0.032,0.068,0.033,0.053,0.045,0.019μg(-1)。方法用于水样中镧、钕、铕、钆、铒和镱含量的测定,回收率在90.0%～101.0%之间,相对标准偏差(n=5)在1.7%～5.4%之间。     

新型离子交换硅胶键合相的制备及评价

二甲基氯硅烷与硅胶表面反应,形成牢固的ＳｉＨ键之后,连接上活泼的中间体——烯丙基缩甘油醚作为柔软的分子臂,最后接上二乙基氨基,由此制得了新型的离子交换硅胶键合相。经漫反射红外光谱、元素分析和高效液相色谱法对键合相进行了鉴定和评价。结果表明：键合反应按预定路线进行,键合相具有较好的色谱性能。此种方法可有效地运用于无孔硅胶填料的制备。     

磁性碳纳米管表面新型镉离子印迹聚合物制备及其对大米中的镉离子富集

以苯胺修饰的磁性碳纳米管为基质,Cd²⁺为模板,甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,在碳纳米管表面制备出一种新型磁性Cd²⁺印迹聚合物(MWNTs/MIIPs)。 采用扫描电子显微镜和红外光谱等技术手段对其形态和化学结构等进行详细表征。 吸附试验结果表明,该磁性印迹材料对Cd²⁺离子具有良好的吸附能力,最大吸附量为16.96 mg/g;选择吸附试验结果表明,该磁性印迹材料对Cd²⁺/Cu²⁺、Cd²⁺/Ni²⁺、Cd²⁺/Pb²⁺和Cd²⁺/Cr³⁺的相对选择因子分别是2.03、2.35、2.16和2.13。 结合原子吸收光谱分析技术,该材料MWNTs/MIIPs可用于大米中的Cd²⁺快速分离富集检测。     

Characterization and Optimization of Polymeric Bispicolamine Chelating Resin: Performance Evaluation via RSM Using Copper in Acid Liquors as a Model Substrate through Ion Exchange Method

Advanced technologies of electronics industries have led to environmental contamination concerns, especially waste print circuit boards containing a very high concentration of copper (II) ions, which can be discharged in wastewater containing many contaminated metals. A low pH is a necessity for treating industrial wastewater containing heavy metals to meet engineering process design. A novel polymeric bispicolamine chelating resin, Dowex-M4195, was applied as an alternative for investigating the behavior of copper (II) in acidic solution via an ion exchange method in a batch experiment system. Characterization of physical and chemical properties before and after ion exchange were also explored through BET, SEM-EDX, FTIR and XRD. Response surface methodology was also applied for optimization of copper (II) removal capacity using design of experiment for selective chelating resin at a low pH. The results indicate that H⁺ Dowex-M4195 chelating resin had a high-carbon content and specific surface area of >64% and 26.5060 m²/g, respectively. It was predominantly macropore porous in nature due to the N₂ gas adsorption isotherm and exhibited type IV with insignificant desorption hysteresis loop of H1-type. It was spherical and cylindrical. After the ion exchange process of copper (II)-loaded H⁺ Dowex-M4195, the specific surface area and total pore volume decreased by about 17.82% and 5.39%, respectively, as compared to H⁺ Dowex-M4195. Hysteresis loop, isotherm and pore size distribution were also similar. Regarding the functional group, the surface morphology and crystalline structures of H⁺ Dowex-M4195 showed copper (II) compound based on the structure of chelating resin that confirmed effective ion exchange behavior. The design of optimization indicated that copper (II) removal capacity of about 31.33 mg/g was achieved, which could be obtained at 6.96 h, pH of 2 (a desirable low pH), dose of 124.13 mg and concentration of 525.15 mg/L. The study indicated that the H⁺ Dowex-M4195 (which is commercially available on the market) can successfully be applied as an alternative precursor through the ion exchange method for further reuse and regeneration of the copper (II) in the electronic waste industries and other wastewater applications needed to respond the policy of biocircular green economy in Thailand.     

生物碱基的反相离子对色谱分离及茶叶中咖啡因测定的研究

报道了在ＹＷＧＣ１８柱上，以甲醇＋水（７．５＋９２．５）、含５ｍｍｏｌ／ＬｐＨ５．０磷酸盐缓冲溶液、１０ｍｍｏｌ／ＬＴＢＡ·Ｂｒ作流动相，同时分离尿嘧啶、９Ｎ二羟丙基腺嘌呤、腺嘌呤、可可碱、尿嘧啶丙酸、９Ｎ二羟丙基茶碱和咖啡因，并用于茶叶中咖啡因的测定，检出限为μｇ／Ｌ级，标准加入回收率为９５．３％～１０５．０％。     

光度法及离子色谱法测定驱油剂中硫酸根含量——联合运用盐析法及活性炭吸附法除去其复杂有机物基体干扰

提出了一种简单、快速的盐析与活性炭吸附混合法,用于去除铬酸钡光度法及离子色谱法测定驱油剂中硫酸根时复杂的有机物基体干扰。考察了样品处理方法、盐种类、盐用量、活性炭用量对基体去除效果的影响。发现使用盐析与活性炭吸附混合法且盐、活性炭质量浓度分别为60,40g·L~(-1)时具有最佳的去除基体干扰效果。方法用于5种驱油剂样品的预处理,并与铬酸钡间接光度法及离子色谱结合用于硫酸根的测定,两种方法测定结果吻合良好。     

Use of The Luminol Reaction for Metal Ion Detection in Liquid Chromatography

Abstract

The use of high performance liquid chromatography (HPLC) for the separation and quantitation of trace metals in solution has been hampered by the lack of A suitable detection system. The method generally used with classical metal ion separations - fraction collection and subsequent colorimetric detection - cannot easily be used in HPLC. To overcome this problem, A novel metal ion detection system based on the luminol reaction has been developed. Column effluent is successively mixed with luminol and then hydrogen peroxide before entering A chamber where chemiluminescence from the oxidation of the luminol is detected. The reaction is catalyzed by at least 20 different metal ions, and over A wide range the luminescence is proportional to metal ion concentration. The design of the system and some of its performance characteristics are described.     

Ion chromatography for the separation of heparin and structurally related glycoaminoglycans: A review

The global crisis resulting from adulterated heparin in late 2007 and early 2008 revived the importance of analytical techniques for the purity analysis of heparin products. The utilization of ion chromatography techniques for the separation, detection, and structural determination of heparin and structurally related glycoaminoglycans, including their corresponding oligosaccharides, has become increasingly important. This review summarizes the primary HPLC approaches, particularly strong anion exchange, weak ion exchange, and reversed‐phase ion‐pair, used for heparin purity analysis as well as structural characterization. Strong anion exchange HPLC has been studied most extensively and currently offers the best separation of crude heparin and heparin‐like compounds. Weak anion exchange HPLC has been shown to provide shorter analysis times with lower salt concentrations in the mobile phase but is not as widely developed for the separation of all glycoaminoglycans of interest. Reversed‐phase ion‐pair HPLC offers fast and effective separations of oligosaccharides derived from glycoaminoglycans that can be coupled to mass spectrometry for structural analysis. However, this method generally does not provide sufficient retention of intact glycoaminoglycans.     

锂离子电池Si@void@C复合材料的制备及其电化学性能

以纳米Si颗粒为核心,正硅酸四乙酯(TEOS)为SiO_2源,采用Stober法在Si表面包覆一层SiO_2,再以多巴胺为碳源,通过碳化处理将SiO_2表面的聚多巴胺层转化成碳层。最后,用HF刻蚀SiO_2并留下空隙,得到Si@void@C复合纳米颗粒。利用X射线衍射、扫描电镜、透射电镜和恒流充放电测试对材料的物相、微观形貌和电化学性能进行表征。结果表明,在0.1 A·g~(-1)电流密度下,Si@void@C负极材料充放电循环100次后充电比容量仍然有1 319.5 mAh·g~(-1),容量保持率为78.4%,表现出优异的电化学性能。     

锂离子电池Si@void@C复合材料的制备及其电化学性能

以纳米Si颗粒为核心,正硅酸四乙酯（TEOS）为SiO₂源,采用Stober法在Si表面包覆一层SiO₂,再以多巴胺为碳源,通过碳化处理将SiO₂表面的聚多巴胺层转化成碳层。最后,用HF刻蚀SiO₂并留下空隙,得到Si@void@C复合纳米颗粒。利用X射线衍射、扫描电镜、透射电镜和恒流充放电测试对材料的物相、微观形貌和电化学性能进行表征。结果表明,在0.1 A·g^-1电流密度下,Si@void@C负极材料充放电循环100次后充电比容量仍然有1 319.5 mAh·g^-1,容量保持率为78.4%,表现出优异的电化学性能。