【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: 10.12461/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。
【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.
【大学化学】doi: 10.12461/PKU.DXHX202411016
构建全英文课程体系对于培育具备全球视野的人才具有重大意义,它是推进教育国际化的关键环节。在全球化进程和教育政策的引领下,本项研究着眼于地方本科院校在全英文无机化学课程教学中面临的挑战,进行了深入的实践探索。研究详尽介绍了具体的实施策略及其成效,涵盖了课程概述、教学目标、教学内容、教学资源、教学方法、教师团队、课程思政以及教学效果等8个关键领域,归纳并提炼了无机化学全英文课程建设的特色与创新点,旨在为国内相似课程的建设提供参考和启示。
【无机化学学报】doi: 10.11862/CJIC.20250110
Perfluoroalkyl acids of different chain lengths, including trifluoroacetic acid, heptafluorobutyric acid, and nonafluoropentanoic acid, were used as second ligands to replace the formic acid on the Zr6 clusters in MOF-808. This led to the formation of a series of MOF-808-R materials (R=F3, F7, F9, corresponding to trifluoroacetic acid, heptafluorobutyric acid, and nonafluoropentanoic acid) with multiple ligands, and we investigated the impact of the second ligand modification on pore size and pore environment. The loading amount of the second ligand was determined using NMR and other methods. We conducted adsorption tests for acetylene and carbon dioxide at different temperatures on both MOF-808 and MOF-808-R to explore the effects of the ligand diversification on acetylene separation performance. It was found that MOF-808-F7 exhibited the best performance in acetylene-carbon dioxide separation.
【大学化学】doi: 10.12461/PKU.DXHX202405138
概念图作为组织和表征知识的工具,因能促进有意义的学习,减少无关认知负荷,成为科学课程教学的有效策略,尤其对语言能力不够的学生特别有益。为帮助学生在全英语课程学习中获得成功,本研究将概念图策略运用在基础化学全英语课程教学中,围绕概念图作业的实施,对学生的学业成绩、概念图的评估和学生对实施概念图作业的看法进行统计分析,考察在基础化学全英语课程中使用概念图作业的有效性。
【无机化学学报】doi: 10.11862/CJIC.20240345
CsxWO3/TiO2 composites with full‐spectrum catalytic activity were prepared by solvothermal reaction. The composites were characterized using X‐ray diffraction (XRD) analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area testing, X‐ray photoelectron spectroscopy (XPS), and UV‐Vis diffuse reflectance spectra (UV‐Vis DRS). CsxWO3 and TiO2 were uniformly bonded together in the composites. The heterojunction structure was formed. The band gap was reduced from 2.75 to 2.65 eV. The photocatalytic property of CsxWO3/TiO2 was demonstrated by the degradation rates of 20 mg·L-1 methylene blue dye, which were 99.7%, 91.4%, and 70.7% under irradiation from a 300 W high‐pressure mercury lamp, a 500 W xenon lamp, and a 400 W infrared lamp, respectively. After five cycles of photocatalytic degradation, the composite photocatalyst still showed a degradation efficiency of 87.6%. This indicates that CsxWO3/TiO2 has good photocatalytic degradability and cyclic stability. The photocatalytic mechanism of CsxWO3/TiO2 was investigated. The trapping experiments of the active species showed that the main active substances were the empty hole (h+) and hydroxyl radical (·OH).
【无机化学学报】doi: 10.11862/CJIC.20230477
采用原位溶剂热反应制备多级Ag/Bi/Nv-g-C3N4(氮空位-g-C3N4)/Ti3C2Tx肖特基结,并对其物相组成和晶体结构、微观形貌和孔结构、表面元素组成和化学态、光学和光电化学性质进行了表征。由于Ag、Bi和Ti3C2Tx协同的表面等离激元共振效应,Ag/Bi/Nv-g-C3N4/Ti3C2Tx表现出全光谱吸收特性。由载流子浓度差驱动的界面极化电荷转移诱导形成的肖特基结,显著提高了光生载流子(包括热电子和热空穴)的分离效率和利用率。因此,与Nv-g-C3N4、Ti3C2Tx、Ag/Nv-g-C3N4、Bi/Nv-g-C3N4和Ag/Bi/Nv-g-C3N4相比,Ag/Bi/Nv-g-C3N4/Ti3C2Tx表现出显著增强的全光谱催化活性,其在可见光和近红外光照射下光催化降解四环素的反应速率常数分别为0.033和0.008 6 min-1,为对比样品的10~2.1倍和8.6~1.8倍。
【燃料化学学报】doi: 10.1016/S1872-5813(24)60514-1
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