2021/09/03 14:27
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艾柯Advanced-III分子研究实验室用超纯水机
型号: Advanced-III超纯水机
产地: 四川
品牌: 艾柯
¥3万 - 5万
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艾柯Advanced-I实验室超纯水机厂家直营
型号: Advanced-I超纯水机
产地: 四川
品牌: 艾柯
¥3万 - 5万
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方案详情:
良好活性炭的比表面积一般大于1000m2/g,细孔总容积可达0.6-1.8mL/g。活性炭的吸附能力以物理吸附为主,没有极性,一般是可逆的,实验发现,它也可进行一些选择吸附,即化学吸附。
制作温度在300-500℃时,酸性氧化物占优势,这种酸性氧化物在水中离子化时,活性炭就带负电荷;
制作温度在800-900℃时,活性炭具有两性性质。由测定电位得知:一般活性炭带负电荷,在溶液中显弱酸性,在pH值较低的酸性条件下,吸附性较好;在pH值较高的碱性条件下,吸附性较差。
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文献名: Structural, morphological and optical properties of Bi NPs obtained by laser ablation and their selective detection of L-cysteine 作者: Ramon Gabriel Teixeira Rosaa, Celso de Araujo Duartea , Wido Herwig Schreinera, Ney Pereira Mattoso Filhoa, Arandi Ginane Bezerra Jr.b, Andersson Barisonc, Fernanda Maria Marins Ocamposc a Departamento de Física, Universidade Federal do Paraná Centro Politécnico, CP 19044, 81531-990 Curitiba (PR), Brazil b Departamento Acadêmico de Física, Universidade Tecnológica Federal do Paraná, 80230-901 Curitiba (PR), Brazil c Departamento de Química, Universidade Federal do Paraná Centro Politécnico, CP 19081, 81531-990 Curitiba (PR), Brazil 摘要:In the present work we show the results of the investigation of the properties of bismuth nanoparticles (NPs) obtained by the laser ablation in water. The samples were characterized by various techniques: UV/vis spectroscopy, dynamic light scattering, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, nuclear magnetic resonance and zeta potential. The NPs were metallic and surface oxidated, exhibiting absorption peak at 257 nm due to the surface plasmon resonance. The interaction between the NPs and various amino acids was studied and revealed a selective sensibility to cysteine on a range of concentration from 80 to 720 μM, which we attribute to a dimerization of cysteine to cystine probably complexed to the nanoparticle surface by electrostatic interactions, leading to the modification of the NP absorption spectrum. 关键词:Bismuth; Nanoparticles; Laser ablation; Cysteine
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城市污水中TOC与COD的关系
TOC与COD的测定方法不同。测定COD是采用强氧化剂和加热回流的方法,只能将水中的有机物部分氧化(氧化率较低),并且测定时间较长,即使目前一些快速的
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固定污染源废气苯系物的测定—气袋采样/直接进样气相色谱法
本文参考生态环境部发布的标准《HJ 1261- 2022 固定污染源废气 苯系物的测定 气袋采样/直接进样-气相色谱法》,使用磐诺气相色谱仪,进行苯系物含量测定。
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赛默飞卫生级(Hygienic)应用双螺杆挤出机
双螺杆挤出技术是一种用于聚合物行业新材料开发的成熟技术。作为一种高效且连续的 混合工艺,其可以提供高灵活性并对工艺参数进行严格控制。近年来,该技术已推广到其 他应用领域,制药和食品行业加大了对挤出工艺的采用力度。在这些行业中,要完全发挥应用潜力,需要满足特定的设备要求并使用专用附件。 赛默飞可提供采用卫生级设计的专用双螺杆挤出机和附件,帮助研究人员开发下一代新型食品、生物材料和药物。
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