柱状薄层离子色谱电自生式抑制器

设计一种新型的柱状薄层离子色谱电自生式抑制器.采用多孔电极实现电极-电解液室一体化,消除了电极-电解液室的电压降;柱状薄层的抑制室结构规范了装配工艺并简化了结构,提高其抑制器的性能.     

Effect of Different Energy Sources on Ochrobactrum anthropi Bacteria Chromium Reduction

Ochrobactrum anthropi CTS-325 isolated from a chromium-contaminated site had better resistance to Cr(Ⅵ) in LB medium under aerobic condition.Meanwhile,it was found that the reduction of Cr(Ⅵ) is not complete during the experimental process.Therefore,a series of small molecule energy sources including nitrogen and carbon sources were added into the LB medium in the bacterial stationary phase to promote the chromium reducibility.The result showed that the bacterial growth was positively correlated with the chromium reduction.SDS-PAGE analysis indicated that the protein groups were changed when the bacteria were stimulated by the chromium.Additionally,it was revealed that O.anthropi CTS-325 could utilize the cheaper alternative of sugar(sucrose residue leaching solution) well for further growth and restart the chromium reduction,which offered a new method for practical appli-cations.     

碳钢在N-甲基二乙醇胺介质中的电化学阻抗谱研究

应用电化学阻抗谱(EIS)研究碳钢在N-甲基二乙醇胺(MDEA)介质中的腐蚀行为.实验表明,未经预阴极活化处理的碳钢表面存在氧化膜,溶解氧促使它腐蚀速率增大,经活化处理去除氧化膜后则相反.在不含热稳定性盐(HSS)的MDEA溶液中,碳钢的腐蚀性随MDEA浓度的增加呈先上升后下降趋势;而在HSS高含量的溶液中,其腐蚀性则随MDEA浓度的增加而单调下降.在含有HSS模拟溶液中,碳钢的阳极极化EIS随极化电位由低到高分别出现感抗、负阻抗以及Warburg阻抗响应等特征,对应于孔蚀、活化状态向钝化状态过渡以及进入钝化的趋势,腐蚀反应的阴极过程表现为电化学反应和扩散传质混合控制,阳极过程为电化学反应控制.     

高分散性片状阻燃型氢氧化镁的制备

以轻烧氧化镁为原料, 通过水化水热法制备高分散性片状氢氧化镁. 考察了不同的水化温度、水化时间、水热时间和分散剂体系对氢氧化镁材料形貌的影响. 采用X射线衍射(XRD)、扫描电子显微镜(SEM)、全自动氮物理吸附仪(ASAP)等对所制得的氢氧化镁颗粒的物相、形貌和比表面积进行了分析. 结果表明, 通过水热反应控制和分散剂的加入, 可以得到高分散性片状的阻燃型氢氧化镁.     

Surface Changes of Ochrobactrum Anthropi in Cr（Ⅵ） Treatment for 1 Hour

Bioremediation has been a considerable method for treating Cr（VI） contamination. Bacterial surface changes of Ochrobactrum anthropi during Cr biosorption was investigated in this study. We found that Cr adsorption capacity increased with the increase of initial Cr（Ⅵ） concentration. Atomic force microscope （AFM） morphologic analysis combined with surface roughness analysis indicated that the bacterial surfaces became rougher during Cr uptake process. X-ray photoelectron spectroscopy （XPS） showed that Cr（Ⅲ） was adsorbed on the bacterial surfaces. Fourier transform infrared （FT-IR） analysis showed that surface functional groups including C-O and C-N might be involved in the Cr biosorption process.     

Ni电极电化学流通池检测四环素类药品的研究

比较Au、GC和Ni电极对四环素的电化学响应,讨论了纯Ni电极对四环素的电催化氧化特性,提出以纯Ni为工作电极的电化学流通池,优化结构,建立了测定四环素类抗生素的电化学流通池安培检测法.该方法对四环素、土霉素和强力霉素都有较高的响应灵敏度,线性范围0.1～15mg/L.最低检出限分别为35、45和43μg/L.用此方法可以直接测定四环素类药品的含量.     

原子力显微镜几种成像模式在聚合物太阳能电池材料表征中的应用

聚合物太阳能电池材料表面柔软、粘弹性较强,很容易粘滞探针,从而影响到原子力显微镜的成像质量。本文通过比较轻敲模式、智能成像以及快速扫描模式三种原子力显微镜成像模式对聚合物太阳能电池材料的形貌和相位成像情况,分析探讨了探针型号的选择、作用力控制、扫描速率等参数对成像清晰度和准确性的影响。通过比较可知,弹性系数较小及具有反射镀层的探针均有利于聚合物类样品的检测;控制探针与样品之间较小作用力也有利于获得丰富的形貌信息;另外,扫描速率太高不利于获得细节形貌信息,应将扫描速率控制在一定范围内。因此,选择合适的成像条件和设置适当的扫描参数对原子力显微镜成功应用于分析表征聚合物太阳能电池材料样品具有十分重要的意义。