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关键词： Coal   Chitosan   Manganese adsorption   Statistical modeling   Thermodynamic studies  

摘要： Chitosan was impregnated into porous activated coal to produce a multifunctional chitosan/activated coal (Cs/ Ac) composite. The resulted Cs/Ac was characterized and utilized as a cost-effective adsorbent for Mn(VII) at altered temperatures (i.e., 25, 35, and 45 degrees C). The adsorption results were fitted to classical as well as advanced statistical physics models. The Freundlich equation described well the achieved experimental data at all temperatures. Enhancing the Langmuir adsorption capacity from 203.26 to 224.03 mg/g with temperature indicated that Mn(VII) adsorption was an endothermic process. Steric, energetic and thermodynamics data of the double layer model with two energy sites (i.e., the best fit statistical model) were completely interpreted. The number of Mn(VII) per adsorption site (n) was between 0.76 and 0.92 suggested the presence of multi-docking and multi-interactions mechanisms. The active sites density (NM) of the Cs/Ac decreased with improving temperature. Energetically, Mn(VII) uptake by Cs/Ac was governed by physical interactions (i.e., adsorption energy <40 kJ/ mol). Macroscopically, the interaction between Mn(VII) and Cs/Ac was spontaneous. Overall, modification of the Ac by the used marine biomass (Cs) produced a promising Mn(VII) adsorbent and also, the application of physical analysis offered a deep interpretation for the adsorption mechanism.

关键词： 香港科技大学   材料科学   AIE   物理化学   刺激响应型   生物学   浙江大学   应用潜力  

摘要： 香港科技大学唐本忠院士和浙江大学张浩可研究员对刺激响应型AIEgens相关研究进行了综述。本文要点:(1)得益于独特的优势和广阔的应用前景。AIEgens领域在近年来得到了蓬勃的发展。其中,刺激响应型AIEgens在物理化学、材料科学、生物学和医学等诸多领域都表现出了巨大的应用潜力。

关键词： 物理化学   实战性教学   团队教学  

摘要： 物理化学是四大化学之一,是化学的基础。各个高校授课时,需要时刻关注、分析课堂上同学们学习状态及存在的问题,探索问题原因所在。本文针对目前课堂存在的一些问题,探讨了以OBE为目标导向提出的解决方案及实战性教学法在物理化学中的教学过程中的应用,通过夯实学生的基础知识、培养实际应用的思维,大幅度提升学生的创新能力和水平。

关键词： Curcumin   Zein nanoparticles   Caseinate   Alginate   Stability   Release properties  

摘要： In this study, core-shell biopolymer nanoparticles were fabricated for the encapsulation and delivery of curcumin using a pH-driven method. The influences of the coating composition on the physicochemical properties and curcumin release characteristics of the core-shell nanoparticles were studied. Fourier transform infrared spectroscopy and X-ray diffraction analyses indicated that curcumin was encapsulated in an amorphous state inside the nanoparticles. Particle size and ?-potential measurements indicated that the biopolymer nanoparticles were relatively stable under different environmental conditions: long term storage, heating, pH changes and salt. The DPPH radical scavenging activity of the curcumin was increased after encapsulation within the nanoparticles, whereas the gastrointestinal release of curcumin was prolonged. These results were attributed to the ability of alginate and NaCas to form a thick layer around the nanoparticles, which increased the steric and electrostatic repulsion between them, as well as inhibiting the release of curcumin.

关键词： Biotin   Propylene glycols   Hexylene glycols   Volumetric properties   Acoustic properties   Hydration numbers  

摘要： The current study deals with the analysis of the molecular interactions among the glycols (propylene glycol, PG and hexylene glycol, HG) molecules in (0.000, 0.001, 0.002 and 0.003) ***(-1) aqueous solutions of biotin at constant experimental pressure 0.1 MPa and temperature range (288.15 K, 298.15 K, 308.15 K and 318.15 K). The speed of sound and the density for the liquid mixtures is measured with Anton Paar DSA 5000 M. Numerous thermodynamic and acoustic parameters are determined using these experimental data. The apparent molar volume (V-phi), partial molar volume (V-phi(0)), partial molar volume of transfer (Delta V-phi(0)), apparent molar isentropic compression (K-phi,S), partial molar isentropic compression (K-phi(0),S), partial molar isentropic compression of transfer (Delta K-phi(0),S) were estimated using the experimentally obtained density and speed of sound respectively along with the partial molar expansibility(E-phi(0)), its first-order derivative (partial derivative E-phi(0)/partial derivative T)(P) and pair-triplet interaction coefficients (V-AB, K-AB, V-ABB;K-ABB). The apparent molar properties recommend the existence of strong (solute and solvent) interactions in the ternary mixture which is also justified by the positive partial molar expansibility values, while the partial molar properties suggest the formation of the hydrogen bond in the mixture. With Passynski's equation the hydration number (n(h)) for PG/HG in aqueous solutions of biotin is calculated utilizing the compressibility data and the obtained results are explained in terms of combined hydration effects and hydrophobic effect. (C) 2021 Elsevier B.V. All rights reserved.

关键词： 物理化学   课程思政   改革   理论基础   初步探索  

摘要： 物理化学由于其理论性强、逻辑性强、概念抽象、计算多、公式多,是一门理论性和实践性都很强的课程,是化学和其他相关学科的理论基础。本文从对物理化学课程的介绍和在物理化学课堂中融入课程思政的必要性,对物理化学课程思政改革进行一些初步探索,将思政教育融入高等教育的课堂教学中,以达到使学生的专业知识和思想道德水平共同提高的目的。

关键词： 物理化学   教材建设   国家级教学一等奖   思政优秀教材   紧跟时代步伐  

摘要： 回顾了南开大学化学学院物理化学课程组紧跟时代步伐建设高水平物理化学教材的历程。不断将科研、教学研究、教学改革成果及思政建设融入教材。编著出版的物理化学教材获2009年国家級教学成果一等奖,2021年天津市高校课程思政优秀教材。继续发扬南开化学优良传统,将物理化学教材建设代代相传。

关键词： 课程思政   OBE   物理化学   教学改革   探索  

摘要： 基于OBE理念,将"课程思政"融入《物理化学》课程教学目标,建立《物理化学》课程与环境专业本科生毕业要求细化指标点之间的支撑关系矩阵。挖掘"课程思政"元素,改革"课程思政"方式,从而激发学生学习兴趣,培养学生爱国主义精神与民族自豪感,尽可能实现专业理论课程的价值渗透与价值引领。完善"课程思政"教学效果评价体系,继而不断提升教师对课程思政的理解与实施能力。

关键词： Black soldier fly larvae   Protein extraction and characterization   BSFL flour   Foaming properties  

摘要： The black soldier fly larvae (BSFL), Hermetia illucens (Linnaeus), has been largely utilized for animal feed. Due to its interesting composition, BSFL has great potential to be further implemented in the human diet. Herein we compared the flour and protein extract composition based on their moisture, ash, amino acids, mineral, and protein content. To have wide knowledge on protein profile and behavior, SDS-page electrophoresis, Fourier-transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) were used to give information about protein structure and thermal stability, respectively. The flour and protein extract contained respectively 37.3% and 61.1% of protein. DSC graph reported a glass transition temperature around 30 degrees C, recognizable by a shift in the curve, and an endothermic peak for solid melting at around 200 degrees C. FTIR analysis showed the main amide bands (A, B, I, II, III) for the flour and protein extract. The foam properties of BSFL protein extract were explored under different temperatures treatment, and the best foam stability was reached at 85 degrees C with 15 min of treatment. The data highlight the promising techno-functional properties of BSFL protein extract, and that the nutritional composition might be suitable for further use of BSFL as food fortification system.

关键词： 物理化学   表面张力法   电导法   表面活性剂   临界胶束浓度  

摘要： 通过比较表面张力法和电导法测定阴离子表面活性剂十二烷基硫酸钠(SDS)和非离子表面活性剂辛基酚聚氧乙烯醚(TX-100)的临界胶束浓度的实验效果,明确了2种方法的优劣。采用挂环法测试了不同浓度SDS和TX-100水溶液的表面张力,得到了它们的临界胶束浓度以及饱和吸附量、分子截面积;采用电导法研究上述2种表面活性剂溶液的电导率曲线,仅得到SDS的临界胶束浓度。与电导法相比,表面张力法得到的表面活性剂性质信息更多,应用更广泛。该实验使学生加深理解不同电性表面活性剂临界胶束浓度的性质及测定方法,明确不同方法的优缺点,扩大知识面,同时也提高学生处理数据的能力,为学生今后进一步学习应用表面活性剂打下良好基础。