10 research outputs found

    磁性氧化铝负载Pd催化剂对硝基苯加氢催化活性的研究

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    采用微乳法室温下合成了γ-Al2O3/SiO2/Fe3O4磁性复合颗粒为载体负载的纳米钯催化剂。利用透射电镜、x射线光电子能谱和振动样品磁强计等手段对催化剂进行表征,评价了催化剂对硝基苯加氢制苯胺反应的催化活性。结果表明,通过调控反应条件,可在平均粒径为200nm左右的磁性载体上负载10nm左右均匀分散的Pd纳米颗粒,整个催化剂呈现超顺磁性;在催化剂磁含量为8%、Pd负载量1%、反应时间40min、反应温度50℃,反应压力0.5MPa条件下,硝基苯的转化率可以达到100%,催化剂重复使用10次时仍可保持很高的催化活性,并可在外磁场作用下快速分离与回收

    磁性氧化铝负载Pd催化剂对硝基苯加氢催化活性的研究

    No full text
    采用微乳法室温下合成了γ-Al2O3/SiO2/Fe3O4磁性复合颗粒为载体负载的纳米钯催化剂。利用透射电镜、x射线光电子能谱和振动样品磁强计等手段对催化剂进行表征,评价了催化剂对硝基苯加氢制苯胺反应的催化活性。结果表明,通过调控反应条件,可在平均粒径为200nm左右的磁性载体上负载10nm左右均匀分散的Pd纳米颗粒,整个催化剂呈现超顺磁性;在催化剂磁含量为8%、Pd负载量1%、反应时间40min、反应温度50℃,反应压力0.5MPa条件下,硝基苯的转化率可以达到100%,催化剂重复使用10次时仍可保持很高的催化活性,并可在外磁场作用下快速分离与回收

    磁性氧化铝负载Pd催化剂对硝基苯加氢催化活性的研究

    No full text
    采用微乳法室温下合成了γ-Al2O3/SiO2/Fe3O4磁性复合颗粒为载体负载的纳米钯催化剂。利用透射电镜、x射线光电子能谱和振动样品磁强计等手段对催化剂进行表征,评价了催化剂对硝基苯加氢制苯胺反应的催化活性。结果表明,通过调控反应条件,可在平均粒径为200nm左右的磁性载体上负载10nm左右均匀分散的Pd纳米颗粒,整个催化剂呈现超顺磁性;在催化剂磁含量为8%、Pd负载量1%、反应时间40min、反应温度50℃,反应压力0.5MPa条件下,硝基苯的转化率可以达到100%,催化剂重复使用10次时仍可保持很高的催化活性,并可在外磁场作用下快速分离与回收

    Acetylcholinesterase Biosensor Platform Based on BP2000 for the Detection of Carbaryl

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    为给农药西维因检测提供一种新方法,根据西维因抑制乙酰胆碱酯酶活性的原理,以黑珍珠2000(BP2000)为乙酰胆碱酯酶的固定化材料,采用滴凃电极法构建了基于乙酰胆碱酯酶的西维因生物传感平台. 结果表明,固定在BP2000 上的乙酰胆碱酯酶保持了对氯化乙酰胆碱的催化活性,并且由于BP2000 材料的引入,提升了电极有效的电化学活性表面积,而且电极上物质的电化学氧化拥有较低氧化电位(0.630 V)并伴随质子传输. 由BP2000 搭建成功的乙酰胆碱酯酶生物传感平台对西维因检测的线性响应范围为2.0 ng·mL-1 ~ 12.5 ng·mL-1,检测限为3.15 ng·mL-1. 本研究对酶生物传感平台和酶生物燃料电池体系中酶电极的构建提供了一种简单方法及高效载体.With the purpose of providing a new method for carbaryl (a pesticide) detection, on the basis of the principle that acetylcholinesterase (AChE) activity can be restrained by carbaryl, an AChE biosensor platform based on BP2000 (as a fixation) was constructed by dropping method. As a result, it revealed that AChE immobilized on BP2000 maintained its catalytic activity for acetylcholine (ATCl), and due to the introduction of the BP2000 material, the effective electrochemical surface area of the modified electrode was enlarged. In addition, the electrochemical oxidation at the modified electrode occurred at low potential (0.630 V) accompanied by proton transmission. The AChE biosensor platform based on BP2000 matrix for carbaryl detection was able to reflect a linear response in the range of 2.0 ng·mL-1 ~ 12.5 ng·mL-1 with the detection limit of 3.15 ng·mL-1. At last, this work will provide a simple method and an efficient matrix in establishing an enzyme electrode of enzymatic biosensor platform and enzymatic fuel cell.获2017年中国科学院大学生科创计划资助作者联系地址:1. 暨南大学化学与材料学院,广东 广州 511400;2. 中国科学院长春应用化学研究所,吉林省先进化学电源实验室,吉林长春 130022;3. 长春工程学院理学院;吉林长春 130012Author's Address: 1.College of Chemistry and Material Science, Jinan University, Guangzhou 511400, China; 2.Jilin Laboratory of Advanced Power, Changchun Institute of Applied Chemistry,Changchun 130022, China; 3.School of Science, Changchun Institute of Technology, Changchun 130012, Jilin, China.通讯作者E-mail:[email protected]

    Influence of N/P ratio on the growth and competition of two red tide algae

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    研究了两种赤潮藻即假微型海链藻(Thalassiosira pseudonanaHasle et Heimdalh)和裸甲藻(Gymnodiniumsp.)在不同氮磷比培养条件下的生长特性和藻间竞争作用,探讨了氮磷含量及其比值对赤潮爆发的影响机理.结果表明,在N/P=16条件下,假微型海链藻的最大比增长率最高、相对生长常数最大、平均倍增时间最短,叶绿素a含量最高,说明该N/P值是假微型海链藻最佳生长营养盐条件.对裸甲藻而言,N/P=6是其最佳生长的营养盐条件.叶绿素a含量受N/P值的影响和藻细胞密度所受的影响趋势基本一致.不同N/P值对藻间竞争作用和群落演替的总体影响不明显,都呈现先硅藻后甲藻的群落演替规律.裸甲藻可能具有利用体内磷来维持生长的特点. 【英文摘要】 The growth and species competition of two red tide species Thalassiosira pseudonana and Gymnodinium sp.were studied under different N/P ratio,and the algal batch culture experiments was conducted.The physiological and biochemical indexes were measured periodically,including μ_(max),K,G(d)and Chla.The results showed that when the N/P ratio was 16∶1,the μ_(max),K and Chla of Thalassiosira pseudonana were all the highest,and G(d)was the shortest.This implied that the optimal N/P ratio of Thalassiosira pseudo...福建省自然科学基金项目(D96012);; 国家海洋局海洋科技项目(A01305);; 国家重点基础研究计划项目(2001CB409701)资助课
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