Optimized preparation of zinc-inorganic antibacterial material containing samarium using response surface methodology

A Box-Behnken design(BBD) of response surface methodology(RSM) was used to optimize the preparation of the Zn-Sm antibacterial white carbon black by the sol-gel method. The statistical analysis of the results showed that the particle size of the Zn-Sm antibacterial white carbon black was significantly affected by the reaction time, reaction temperature and the stirring speed. According to analysis of variance(ANOVA), the values of the determination coefficient(R2=0.9821) and the "Pred R-Squared" of 0.8227 were in reasonable agreement with the "Adj R-Squared" of 0.9591. It was indicated that this model could be used to navigate the design space. The optimized reaction time, temperature and the stirring speed were 0.88 h, 87.83 oC, and 473.45 r/min, respectively. In addition, the bacteriostasis rate of the product was about 97.92%.     

分子印迹聚合物微萃取样品前处理技术研究（英文）

分子印迹聚合物微萃取是最近一二十年发展起来的一种新型样品前处理技术,集合了分子印迹技术和微萃取技术两者的优势,广泛应用于食品、药物、环境和生物等复杂样品的前处理,其研究也备受关注.本文综述了分子印迹聚合物微萃取技术在样品前处理中的应用进展,包括分子印迹固相微萃取、分子印迹搅拌棒吸附萃取、分子印迹磁性微球萃取和分子印迹整体材料微萃取,探讨了分子印迹聚合物微萃取样品前处理技术存在的问题和局限,并对其应用前景进行了展望.     

硫代硫酸盐浸金现状与发展

硫代硫酸盐是一种是很有潜质的替代氰化物浸金的试剂。它的价格比较便宜而且是一种无毒试剂,对环境比较友好。但是对于其在工业上应用还存在很多问题。本文评述了硫代硫酸盐浸金的发展历史、浸金的基本原理和回收方法及目前硫代硫酸盐浸金技术存在的问题以及发展趋势。     

硫代硫酸盐浸金中硫代硫酸盐稳定性研究状况

阐述了硫代硫酸盐浸金过程中保持浸金试剂稳定性的主要方法,包括标准氨性硫代硫酸盐浸金体系的改进和非铜氨体系。标准氨性硫代硫酸盐浸金体系的改进主要通过加入螯合剂控制溶液中铜氨络离子的浓度、控制溶解氧、改变溶液离子强度和加入相关硫氧化合物等方式,非铜氨体系主要讨论了铁螯合物,同时概括了研究发展趋势。     

铕-银共掺杂无机抗菌材料的制备及性能研究

将铕和金属银离子共同掺杂到白炭黑中,制得一种含稀土新型无机抗菌材料。通过单因素实验得到最佳制备条件为,铕浓度0.005 mol·L-1,反应温度90℃,反应时间1 h。在此条件下制得的铕-银共掺杂抗菌白炭黑对大肠杆菌具有很好的杀菌效果,杀菌率达98%以上。采用XRD、SEM、EDS和FTIR等手段对所制备的样品进行结构形态表征,结果表明产品为无定形态,铕以两种形态存在于材料中,一种与银共生,附着在载体白炭黑上,另一种则游离在材料中,铕和银的添加并没有明显改变白炭黑原有的结构。     

柠檬酸盐体系电镀稀土Sn-Ni合金

采用正交实验优化,得到一种柠檬酸盐体系电镀稀土Sn-Ni合金的实验方法,给出柠檬酸盐体系电沉积稀土Sn-Ni合金的镀液成分和工艺条件,并且对镀液中各组分的作用进行研究和讨论。研究稀土添加剂CeCl3对Sn-Ni合金镀层的影响,运用扫描电子显微镜对Sn-Ni合金沉积层的组成和形貌进行分析,结果表明:镀液中加入稀土盐CeCl3,控制其质量浓度为2～5 g/L,能改善镀层性能,提高镀层的耐腐蚀性,开始生锈时间由52 h提高到143 h(无钝化)。     

铜型无机抗菌材料的改性研究

研究了添加电解质、表面活性剂和有机溶剂对铜型抗菌白炭黑性能的影响.采用溶胶-凝胶法制备出白炭黑载体,选用Cu2+作为抗菌离子,亚硝酸钠(电解质)、十二烷基苯磺酸钠(表面活性剂)和乙醇(有机溶剂)作为添加剂.运用ICP、粒度分布仪等对改性后的抗菌白炭黑进行表征,采用菌落计数法(菌种选用大肠杆菌)对改性后样品的抗菌性能进行研究.结果表明:通过改性,铜型抗菌白炭黑的抗菌离子含量和杀菌率均有所提高；粒径均一,粒度分布窄；热稳定性较好.     

Synthesis,characterization,and antimicrobial properties of Cu-inorganic antibacterial material containing lanthanum

In this paper a kind of new inorganic antibacterial material:Cu-antibacterial white carbon black containing lanthanum was synthesized.The characterization and antimicrobial effect of the Cu-antibacterial white carbon black containing lanthanum was investigated.Inorganic antibiotic materials comprised the carrier,the antibacterial ion and the additive.In this study,we choosed white carbon black as the carrier,which was compound by a sol-gel method.Copper ion was selected to be the antibacterial ion,and lanthanum nitrate was selected to be the additive.The as-synthesized Cu-La-antibacterial white carbon black was characterized by inductively coupled plasma(ICP),laser particle size analyzer,Fourier transform infra-red spectroscopy(FT-IR) and antibacterial activity test(Escherichia coli as experimental bacterium).Results showed that the amount of antibacterial ions of the Cu-La-antibacterial white carbon black was higher than that for the general Cu-antibacterial white carbon black.Its bacteriostasis rate was about 98%(when the content of Cu2+ was about 3%),and corresponded to Ag-antibacterial white carbon black(99%).The particle size of Cu-La-antibacterial white carbon black was under 30 μm with a narrow size distribution.Copper ion was bound to white carbon black by ion exchange process.Moreover,this new inorganic antibacterial material showed promising result on the coating surface of metal.