MOF衍生的分层多孔三维N-CoPx/Ni2P大电流密度下加速析氢

氢气(H2)具有能量密度高、环境友好等优点,是一种很有前景的清洁能源载体.目前,电催化水裂解大规模制氢被认为是一种理想可行的方法.析氢反应(HER)涉及多个步骤,首先形成吸附的氢(Volmer步骤),然后是脱附步骤(Heyrovsky步骤)或两个相邻的吸附氢形成H2(Tafel步骤).与酸性介质相比,碱性介质中的HER...     

在线净化加速溶剂萃取–气相色谱–质谱法测定土壤中11种半挥发性有机物

采用加速溶剂萃取法对样品进行在线净化和萃取,气相色谱–质谱法测定土壤中11种半挥发性有机物.考察了净化条件、萃取剂、浓缩条件等因素对土壤中11种半挥发性有机物测定的影响,分析了在线净化和离线净化的差异以及在线净化的优势.以弗罗里硅土和石墨化碳黑为净化剂,石英砂为分散剂,土壤样品经快速溶剂萃取仪在线净化萃取,浓缩后采用气...     

Treatment effects and mechanisms of Cu(II) coordination polymer in hypotension after anesthesia

A Cu(II) coordination polymer (CP) (that is, [Cu₂(OH)(H₂O)₂(cbca)·2H₂O]_n (1)) has been obtained with the reaction between Cu(II) salt and 4′-(1-carboxyethoxy)-[1,1′-biphenyl]-3,5-dicarboxylic acid (H₃cbca), a semi-rigid tricarboxylic acid ligand under the hydrothermal reaction condition. Prevention activity of the new compound on hypotension after anesthesia surgery was evaluated and the related mechanism was researched at the same time. The noninvasive blood pressure monitor was firstly conducted to measure the blood pressure of the animal after compound treatment. Besides, the real time RT-PCR assay was also used to determine theα receptor relative expression on vascular endothelial cells after compound treatment.     

光电解水制氢耦合生物质醇/醛氧化的研究进展

生物质醇/醛是一类重要的生物基平台化合物, 通过催化氧化重整可将其进一步转化为高值含氧化学品或燃料. 太阳能驱动的光电催化技术是实现生物质醇/醛氧化最为绿色高效的途径之一. 与传统光电解水制氢相比, 利用生物质醇/醛氧化来替代阳极析氧过程不仅可以提高阳极产物的附加值, 同时可以提升太阳能到氢能的转化效率. 因此, 光电解水制氢耦合生物质醇/醛氧化对绿氢提效降本和高值化学品合成具有重要意义. 本文综合评述了光电解水制氢耦合生物质醇/醛的氧化反应机理, 总结了目前光电催化技术在生物质醇/醛氧化方面的研究进展, 最后对该领域所面临的机遇和挑战进行了展望.     

Mn-MOF衍生的Mn2O3微马达用于水中甲基蓝的去除

以锰金属有机框架(Mn?MOF)为前驱体制备了Mn₂O₃微球。所得微球大小约为4μm,尺寸均匀,具有完美的球形结构,表面粗糙,结晶度好,产率较高。同时,研究了Mn?MOF衍生的Mn₂O₃微马达在不同条件下的运动性能以及对甲基蓝的降解性能。Mn₂O₃微马达运动性能优异,在10%的H₂O₂溶液中,其运动速度可达81.32μm·s^-1。实验结果表明,加入H₂O₂后,Mn₂O₃微马达在5 min内通过降解作用可有效去除MB。     

研究性与系统性相结合的有机合成实验教学实践

为了培养学生的创新能力和实践能力,使学生较全面地掌握有机合成实验理论知识和实验技能,开展了有机合成实验研究性和系统性结合的教学探索和实践。在课程建设和教学过程中,贯彻以学生为主体的教学改革思路与方法。从教学内容和模式、授课方式、考核方式等多个教学环节进行探索研究,科教融合,结合实际课堂教学,倡导启发式教学方法。研究型教学模式的实施有效地调动了学生自主研究性学习的积极性,有利于提高学生的综合实践能力,促进实验教学与科学研究的衔接。     

An Iridium Complex as an AIE-active Photosensitizer for Image-guided Photodynamic Therapy

Image-guided photodynamic therapy (PDT) has received growing attention due to its non-invasiveness and precise controllability. However, the PDT efficiency of most photosensitizers are decreased in living system due to the aggregation-caused singlet oxygen (¹O₂) generation decreasing. Herein, we present an Iridium (III) pyridylpyrrole complex (Ir-1) featuring of aggregation-induced emission (AIE) and ¹O₂ generation characteristics for image-guided PDT of cancer. Ir-1 aqueous solution exhibits bright red phosphorescence peaked at 630 nm, large Stokes shift of 227 nm, and good ¹O₂ generation ability. The ¹O₂ generating rate of Ir-1 in EtOH/water mixture solution is 2.3 times higher than that of Rose Bengal. In vitro experimental results revealed that Ir-1 has better biocompatibility and higher phototoxicity compared with clinically used photosensitizers (Rose Bengal and Ce6), suggesting that Ir-1 can serve as a photosensitizer for image-guided PDT of cancer.     

A High-Efficiency Hematite Photoanode with Enhanced Bonding Energy Around Fe Atoms

Hematite nanoarrays are important photoanode materials. However, they suffer from serious problems of charge transfer and surface states; in particular, the surface states hinder the increase in photocurrent. A previous strategy to suppress the surface state is the deposition of an Fe-free metal oxide overlayer. Herein, from the viewpoint of atomic bonding energy, it is found that the strength of bonding around Fe atoms in the hematite is the key to suppressing the surface states. By treating the surface of hematite with Se and NaBH₄, the Fe₂O₃ transforms to a double-layer nanostructure. In the outer layer, the Fe−O bonding is reinforced and the Fe−Se bonding is even stronger. Therefore, the surface states are inhibited and the increase in the photocurrent density becomes much faster. Besides, the treatment constructs a nanoscale p–n junction to promote the charge transfer. Improvements are achieved in onset potential (0.25 V shift) and in photocurrent density (5.8 times). This work pinpoints the key to suppressing the surface states and preparing a high-efficiency hematite nanoarray, and deepens our understanding of hematite photoanodes.