【无机化学学报】doi: 10.11862/CJIC.20240255
采用原位聚合法制备了氯氧化铋(BiOCl)与聚苯胺(PANI)复合的Ⅱ型异质结光催化剂BiOCl/PANI,并采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)、紫外可见漫反射光谱(UV-Vis DRS)和N2吸附-脱附测试等多种技术手段对其进行了表征,考察了BiOCl/PANI在模拟可见光下对罗丹明B (RhB)的光催化降解性能。实验结果表明:BiOCl/PANI催化剂比PANI和BiOCl具有更高的光催化活性,在RhB质量浓度为50 mg·L-1、PANI与BiOCl的物质的量之比为0.02∶1、50 mg·L-1的催化剂条件下,所制备的BiOCl/PANI光催化150 min后,RhB降解率为98.8%,速率常数为0.031 min-1;经过4次循环实验后,RhB降解率从98.8%降低至98.4%,表现出良好的稳定性和可重复利用性。光催化剂BiOCl/PANI实现了电子和空穴对的快速分离,降低了二者在催化剂内部的复合速率,提高了光催化性能。
【大学化学】doi: 10.3866/PKU.DXHX202309092
现行的实验教材中缺乏双核桥联配合物合成的实验,关于仲胺合成和Cu(II)氧化性的知识也较少。本实验从有机化学理论知识中的基本反应出发,设计了两条路线合成目标仲胺配体,即基于亲核取代反应的路线一和亲核加成缩合-还原的路线二。运用配位化学原理及有机化学中的共轭驱动效应,使弱氧化性的Cu(II)将仲胺氧化成共轭的芳香亚胺(希夫碱)结构,同时利用希夫碱的配位作用和氯离子的桥联配位作用形成稳定的氯桥联双核Cu(I)配合物。为适应普通高校的实验教学条件,本实验还设计了一套操作简单、现象直观的Cu(I)配合物中铜离子价态的鉴定实验。本实验所涉实验原理既包含基础化学反应知识,又体现最新的科学研究成果,反应条件温和、实验现象直观、重现性好、收率高,能有效提高学生的综合实验操作技能,锻炼学生的有机合成、配位合成能力。
【大学化学】doi: 10.12461/PKU.DXHX202405147
仪器分析实验“分子荧光法测定罗丹明B的含量”存在实验过于简单、未考虑实际情况等问题。因此,本改进实验在三维荧光扫描模式下获取样本数据,不进行复杂预处理,而是运用化学计量学算法解析出目标分析物的纯信号,进而实现了染色辣椒中罗丹明6G和123的同时测定。本改进实验提高了学生全面考虑问题和创新解决问题的能力。
【大学化学】doi: 10.3866/PKU.DXHX202311033
将有机光化学领域的前沿研究引入到本科实验教学中,以苯甲醛、苯胺和4-异丙基-1,4-二氢吡啶作为起始原料,在温和条件下进行可见光介导的一锅法串联反应,实现了仲胺化合物的制备。实验具有原料廉价易得、反应条件温和、安全性高、操作简单等特点,同时融入绿色化学理念和有机合成方法学的实验探究过程,适用于本科实验教学,可帮助学生在熟练实验操作的同时,增强对光化学反应、一锅法串联反应、自由基反应等知识的理解。本实验将新的科研成果转化为人才培养内容,有助于提高学生的科研创新与实践能力。
【无机化学学报】doi: 10.11862/CJIC.20240219
A simple two-step hydrothermal method synthesized four different CdS/Fe3O4 photocatalysts with varying ratios of mass of CdS to Fe3O4. The composition and morphology of the prepared samples were investigated using X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Solid UV reflectance spectra testing found that CdS/Fe3O4 nanocomposites had good light absorption throughout the spectral range, promoting their photocatalytic properties. Under visible light irradiation, CdS/Fe3O4 (2:5) with a mass ratio of 2:5 exhibited excellent photocatalytic performance, with a degradation rate of 98.8% for rhodamine B. Furthermore, after five cycles of photocatalytic degradation reaction, the rhodamine B degradation rate remained at 96.2%, indicating that the photocatalysts have good photocatalytic stability.
【无机化学学报】doi: 10.11862/CJIC.20250028
A flower-like BiOBr photocatalyst (CS/BiOBr) was prepared by using the carbon material derived from corn straw (CS) as the carrier. The prepared composites were characterized by X - ray diffraction (XRD), Fourier transform infrared (FIIR) spectra, scanning electron microscope (SEM), X - ray photoelectron spectra (XPS), and UV-Vis diffuse reflectance spectra (UV-Vis DRS). The SEM analyses indicate that the introduction of CS promotes the formation of a unique flower-like structure in BiOBr, which not only optimizes the efficiency of light capture but also increases the specific surface area of BiOBr. The bandgap of the composite was narrower compared with the pure BiOBr. The CS/BiOBr composites exhibited higher photocatalytic activity than pure CS and BiOBr under visible light irradiation, and a higher first-order reaction rate constant (k) of 0.043 7 min-1 than BiOBr (0.014 6 min-1), and exhibited excellent stability and reusability during the cyclic run. The enhanced photocatalytic activity is attributed to the efficient separation of photoinduced electrons and holes. Superoxide radicals and holes were the major active species.