活性炭自硫脲溶液吸附金的氧化还原机理探讨

采用X射线衍射、元素分析及显微技术等方法,研究了活性炭(AC)自溶液中吸附金硫脲络合物的机理。研究发现,溶液中络合离子被活性炭表面的≥C-OH和≥C-H官能团还原为零价金Au(0)而吸附;提出了氧化还原吸附机理可能的步骤,并用Nernst公式证明该氧化还原吸附过程为自发过程。     

多基硫脲类Schiff碱的合成及生物活性与离子识别

以异硫氰酸苯酯、氨基硫脲、乙二胺、氨基脲和二乙撑三胺为原料,合成了异硫氰酸苯酯-氨基甲酰肼(PITCAM)、异硫氰酸苯酯-硫代氨基脲(PITCTSC),双异硫氰酸苯酯-1,2-二氨基乙烷(PITCE)和双异硫氰酸苯酯-二乙撑三胺(PITCD)4种多基硫脲类Schiff碱,其结构经1HNMR、IR、ESI-MS和元素分析进行表征.对4种合成的化合物进行抑制大肠杆菌、金黄色葡萄球菌以及欧文氏草生杆菌的生物活性测定,结果表明4种合成的多基硫脲类Schiff碱化合物均具有一定的生物抑菌活性,其中合成的化合物PITCAM的生物抑菌活性最好;测试其对不同金属离子的荧光响应光谱,实验结果表明PITCAM对Cu2响应明显.     

硫脲基松香咪唑啉季铵盐 对A3碳钢的缓蚀性能研究

合成了硫脲基松香咪唑啉季铵盐,对其结构进行了红外和核磁表征。采用失重法、动电位极化曲线、交流阻抗以及接触角测试分析了目标产物在质量分数为15%HCl溶液中对A3碳钢的缓蚀性能。采用AFM以及XPS测试对产物的吸附膜进行了表征。结果表明：目标产物的缓蚀效率随添加质量分数的增加先增大后减小,当目标产物质量分数增加到占盐酸质量的0.4%时,缓蚀效率最高达到90.78%;此物质是一种阴极控制为主的混合型缓蚀剂;AFM以及XPS结果证实目标产物确实可以在碳钢表面形成缓蚀剂吸附膜。     

Rapid and highly efficient synthesis of thioureas in biocompatible basic choline hydroxide

A straightforward and convenient synthesis of symmetrical thiourea derivatives by the reaction of primary amines and carbon disulfide in biocompatible basic choline hydroxide is presented. A variety of biologically important thiourea derivatives can be obtained in good to excellent yields without a tedious work-up under mild reaction conditions. A series of primary aliphatic and aromatic amines with different substituted functional groups have been converted to thiourea derivatives under milder reaction conditions and short reaction times.     

分光光度法测定低氰镀锌溶液中硫脲的含量

根据硫脲在ｐＨ２～３醋酸介质中可被ＮａＮＯ２氧化成ＨＳＣＮ，利用ＨＳＣＮ与Ｆｅ（ＮＯ３）３反应生成红色的硫氰酸铁配合物的性质，建立了分光光度法测定低氰镀锌液中硫脲含量的方法，该方法线性范围为０～２．５ｍｇ／２５ｍＬ，回收率为９８．８～１０２．５％。     

甲烷磺酰氯的合成与精制

介绍了甲烷磺酰氯的几种合成方法。探讨了反应温度、通氯速度、氯气、盐酸浓度和用量对产品收率及质量的影响，确定了适宜的工艺条件。介绍了粗品精制的过程。     

NUCLEATION OF THIOUREA ADDUCT CRYSTALS WITH CYCLOHEXANE-METHYLCYCLOPENTANE SYSTEM

To study the homogeneous nucleation of thiourea adducts, the metastable zone widths for the thiourea adducts formed with guests of cydohexane, methylcyclopentane (MCP) and their mixtures were determined. The influence of moderate agitation rate and saturation temperature on the maximum allowable undercooling (i.e., metastable zone width) was studied. The metastable zone width is markedly affected by the cooling rate and the agitation rate. MCP in guests roles to retard the nucleation rate of cyclohexane-MCP-thiourea adducts by causing k2 to decrease. The order of the nucleation in the nucleation process of thiourea adducts is in the range between 3 and 6, and appears to be dependent on the saturation temperature and the guest concentration. The nucleation rate constant (i.e., frequency factor (k₂/N_obs) has shown to exclusively depend on the concentration of guest and the temperature. The retarding effect of MCP in the thiourea adduction was found to be caused by, not only the increase of surface energy, but the decrease of k₂/N_obs     

硫脲衍生物缓蚀剂的合成及其缓蚀性能初探

合成了月桂酰基硫脲缓蚀剂,并通过传统的静态失重法结合现代的电化学测试方法初步考察了其抗CO2腐蚀的缓蚀性能。结果表明,该缓蚀剂在CO2腐蚀介质中,当投加量为0.10 g/L时,缓蚀剂的缓蚀效率达91.49%。通过极化曲线分析可知,该缓蚀剂一种抑制阳极过程为主的阳极型缓蚀剂。电化学阻抗谱测试表明,该缓蚀剂通过负催化效应而起到缓蚀效果。     

N-{5-[1-（2’，4’-二氯苯氧）乙基]-1，3，4-噻二唑-2-基}-N’-芳氧乙酰基硫脲的合成与生物活性

通过2-氨基-5-[1-（2’，4＇-二氯苯氧）乙基]-1，3，4-噻二唑与芳氧乙酰基异硫氰酸酯反应，合成了9种新的芳氧乙酰基硫脲，初步的生物活性测定试验表明，部分化合物具有良好的植物生长调节活性。     

硫脲法电镀污泥中提金研究

在电镀行业中金是常用的贵金属之一,提高含金污泥金的回收率一直是研究的热门。论文用酸性硫脲从电镀污泥处理后的树脂中回收金,并探讨了该方法的最佳工艺条件。结果显示,在40℃恒温搅拌条件下用FeCl3.6H2O(加入量2 g/L溶液)、硫脲(浓度1.0 g/L)的混合溶液(pH=1.5)浸取12 h,浸金率最高,可达85%。