离子交换树脂和交换纤维处理含氰废水

采用离子交换树脂、离子交换纤维处理含氰废水。研究了两种不同材料对含氰废水中游离CN-、铜氰配合物、锌氰配合物的吸附性能。结果表明,和离子交换树脂相比,强碱性离子交换纤维对含氰废水中的主要成分铜氰配合物、锌氰配合物具有快的吸附速度和大的吸附容量,是一种有发展潜力的含氰废水处理材料。     

Orally active cephalosporins. II. Synthesis and structure-activity relationships of new 7 beta-[(Z)-2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-cephalospori ns with 1,2,3-triazole in C-3 side chain

The synthesis, antibacterial activity and oral absorbability of 7 beta-[(Z)-2-(2-aminothiazol-4-yl)-2-hydroxyiminoacetamido]-3 -(1H-1,2, 3-triazol-4-yl)thiomethylthio-3-cephem-4-carboxylic acid (1g) and related compounds are described. Their oral absorbability was influenced by the spacer length between C-3 of a cephem nucleus and C-4' of 1,2,3-triazole. The SCH2S structure was also found to contribute to their good oral absorption. The quantitative relationship between the bioavailability and the spacer length of cephalosporins (1a-1n) is discussed.     

某螯合树脂对钒(Ⅳ)离子的吸附行为研究

研究了某螯合树脂A对钒(Ⅳ)离子的吸附行为,考察了pH值、树脂用量、反应时间、反应温度、钒标准溶液浓度对静态吸附效果的影响。实验结果表明,在pH=4、树脂用量1.0g、反应时间4h、温度60℃条件下,螯合树脂A对钒(Ⅳ)的吸附量为184.2mg/g。对螯合树脂A的解吸、共存阳离子的影响等进行了分析。     

加拿大铁精粉对烧结体固结强度的影响及其改善方法

 加拿大铁精粉由于具有铁品位高、脉石及有害元素含量低等优点，其在烧结过程中使用具有有利条件。采用微型烧结法考察了该铁精粉配比对烧结体固结强度的影响及其机理，并研究了4种富矿粉的细粉液相流动性和粗颗粒吸液性。在此基础上，通过固结试验，探究并验证了烧结体固结强度的改善方法。研究结果表明，将该铁精粉配入混匀料中，大幅降低了黏附粉偏析碱度，减弱了液相流动性，因此恶化了烧结体的固结强度。在固定碱度的条件下，高硅铁矿粉有较高的细粉液相流动性，低气孔率铁矿粉有较弱的粗颗粒吸液性。在配加该铁精粉的条件下，选择高液相流动性铁矿粉、弱吸液性铁矿粉、强吸液性铁矿粉粗颗粒分加制粒均能有效改善烧结体的固结强度。     

Study on sorption of D155 resin for gadolinium

The sorption behavior and mechanism of a Macroporous weak acid resin, （D155 resin,） for Gd（Ⅲ） were investigated. The statically saturated sorption capacity is 283 mg/g resin at 298 K in HAc-NaAc medium. The Gd（Ⅲ） adsorbed on macroporous weak acid resin, （D155 resin,） could be reductively eluted with the mixed solution of HCl and NaCl, and the elution percentage was as high as 100%. The resin could be regenerated and reused without remarkable decrease in sorption capacity. The apparent sorption rate constant was k298=1.98×10^5 s^-1. The apparent activation energy was Ea=2.78 kJ/mol. The sorption behavior of D155 resin for Gd（Ⅲ） obeyed the Langmuir isotherm. The thermodynamic sorption parameters were △H=33.0 kJ/mol,△S=192 J/mol/K, and △G298=-24.3 kJ/mol. The sorption mechanism of D155 resin for Gd（Ⅲ） was examined by using chemical method and IR spectrometry. The coordination compound was formed between oxygen atoms in the functional group of D155 resin and Gd （Ⅲ）.     

包覆型浸渍树脂在硫酸介质中吸附铟(Ⅲ)的机理

以P507为萃取剂,HZ818大孔吸附树脂为载体,聚乙烯醇为包覆材料,硼酸为交联剂,制备了包覆型P507浸渍树脂。通过饱和法和等摩尔系列法考察了包覆型P507浸渍树脂在硫酸介质中吸附铟(Ⅲ)的机理,并利用红外光谱对包覆前后浸渍树脂及包覆型P507浸渍树脂吸附铟(Ⅲ)后进行了表征分析。结果表明,包覆型P507浸渍树脂在硫酸介质中吸附铟(Ⅲ)的过程是阳离子交换和配位反应共同作用的结果。     

六方氮化硼填充导热树脂复合材料的研究进展

总结了电气电子领域使用的六方氮化硼(hexagonal boron nitride,h BN)导热填料制备方法,介绍了近几年h BN填充树脂基复合材料的研究进展,研究了导热树脂复合材料的导热机理和导热模型,讨论了h BN填料的形貌、粒度、颗粒复配及表面改性方法等因素对材料导热性能的影响,并对h BN填充高导热树脂复合材料的发展方向进行了展望。     

Synthesis and Drug Release Properties of Thermosensitive Poly(N-vinylacetamide-co-vinylacetate)Hydrogels

Thermosensitive poly[N-vinylacetamide-co-vinylacetate][P(NVA-co-VAc)]hydrogels were prepared via free radical copolymerization from hydrophilic NVA and hydrophobic VAc in the presence of butylenes.bis (N-vinylacetamide)(Bis-NVA)as crosslinker.Scanning electron microscopy(SEM)images reveal that the as-prepared hydrogels were of three-dimensional network with irregular cave structure.The prepared hydrogels with more NVA in the feed swelled faster and the swelling ratio of the hydrogels gradually decreased with temperature increasing from 10℃ to 60℃.The dynamic swelling studies indicate that the swelling process of the hydrogels Was controlled by diffusion of water molecules considered as Fickian-controlled case.The adsorption amount of model drug.sodium salicylate(SS)was higher in the hydrogels containing more NVA units,whose corresponding release could reach equilibrium in about 6 h.     

Effect of pH on sorption for RE（Ⅲ） and sorption behaviors of Sm（Ⅲ） by D152 resin

The pH dependent sorption of rare earth ions （La（Ⅲ）, Ce（Ⅲ）, Pr（Ⅲ）, Nd（Ⅲ）, Y（Ⅲ）, Sm（Ⅲ）, Eu（Ⅲ）, Gd（Ⅲ）, Tb（Ⅲ）, Dy（Ⅲ）, Ho（Ⅲ）, Er（Ⅲ）, Lu（Ⅲ）, and Yb（Ⅲ）） from HAC-NaAC buffer solution at 298 K by D152 resin containing -COOH function groups were presented. The sorption behaviors of D152 resin for Sm（Ⅲ） were discussed as an example. The effects of operational conditions such as pH, temperature, and contact time were studied. The statically saturated sorption capacity was 510 mg/g resin at pH 6.70 in HAc-NaAc medium at 298 K. The sorption behaviors obeyed the Freundlich isotherm. The capacity value for column study was obtained by graphical integration as 495 mg/g resin. Thomas model was applied to experimental data to predict the breakthrough curve and to determine the characteristic parameters of the column useful for process design.     

高拉速连铸保护渣的理化性能研究

高拉速连铸工艺要求连铸保护渣的溶化温度应适当降低，熔化速度应适当增大、粘度适当减小、凝固温度应适当降低、Al2O3吸收速率应适当增大。连铸保护渣的理化性能可以通过调整基料渣系的化学成分和骨架粒子的类型和含量而改变。利用溶化温度、凝固温度、粘度、Al2O3吸收速率与化学成分之间的关系，可以预测连铸保护渣的溶化性能、粘性特征和夹杂物吸收能力。