物理化学课程网站辅助课堂教学浅谈

课程网站的建设是国家级、省级和市级精品课程建设的一个重要环节,同时也是辅助课堂教学的一个重要途径。将物理化学课程网站作为学生学习的第二课堂,在教学过程中突出学生的主体地位,充分利用课程网站,对提高学生对物理化学课程学习的积极性和主观能动性具有重要意义。     

无机化学实验教学初探

无机化学实验是化学教育的重要组成部分,对于培养学生发现问题、解决问题的能力以及创新能力,提高学生对化学学科的学习兴趣具有非常重要的作用。这门课程的教学是以学生为主体,指导教师为主导。本文主要探讨教学内容的优化,以及如何保证教学质量等等方面,旨在提高这门课程的教学质量。     

高校绿色化学实验室建设的探讨

加强绿色化学实验室建设是绿色化学研究的重要内容,通过绿色化学实验课程体系建设、实验室软、硬件建设、环境建设等途径实现绿色化学实验室的目标,是减少实验室污染和保护师生健康的保障,还能减少实验药品、试剂消耗,是培养具有绿色化学理念和环保意识的化学人才的需要。     

制药工程专业物理化学教学改革与实践

以适应制药专业人才培养为主旨,把物理化学的课程特点与制药工程专业的专业特点结合起来,加强物理化学教学与制药工程专业的融合。在激发学生学习兴趣的基础上,通过优化教学内容,改革教学方法与手段,做好归纳与总结,以提高教学效果,培养学生应用型思维与应用能力。     

Kinetics and modeling of L-cysteine effect on the Cu(II)-induced oxidation of quercetin

Abstract

This study aimed at investigating the effect of L-cysteine on the Cu²⁺-induced oxidation of quercetin, within a pH range varying from 6.7 to 8.3 and temperatures varying from 53 to 87?°C. Initial examinations showed that quercetin degradation obeyed apparent first-order kinetics and it was significantly temperature-dependent. Modelling of the effect of L-cysteine by implementing response surface methodology suggested that L-cysteine did not inhibit quercetin oxidation, but it acted as an oxidation stimulant. Liquid chromatography-diode array-mass spectrometry analyses revealed the presence of typical quercetin degradation and oxidation products, including protocatechuic acid, 2-(hydroxybenzoyl)-2-hydroxybenzofuran-3(2H)-one and a quinone methide. However, the presence of two tentative quercetin/L-cysteine adducts evidenced the implication of L-cysteinyl radicals in the relevant reactions. It was concluded that the formation of L-cysteinyl radicals may promote quercetin oxidation, giving rise to substances with unknown biological significance. This fact merits further attention to illuminate possible beneficial or adverse nutritional consequences of such reactions in foods.     

Kinetic Study of Copper Deposition on Iron by Cementation Reaction

Abstract

Cementation of copper on iron powder was shown to be a feasible process to achieve a high degree of copper removal over a broad operational range. First-order kinetics were followed for both the copper concentration and the surface area of iron. To minimize the effect of copper-hydroxyl formation and excess iron consumption, the cementation process was found to be more practical in weak acidic conditions     

A sensitive and selective deep eutectic solvent-based ultrasound-assisted liquid phase microextraction procedure for separation-preconcentration and determination of copper in olive oil and water samples

ABSTRACT

A green and simple deep eutectic solvent-based ultrasound-assisted liquid phase microextraction method has been developed for the preconcentration of copper as 2-(5-bromo-2-pyridylazo)-5-(diethylamino) phenol chelates. The effects of pH, ligand concentration, DES volume, sample volume, and tetrahydrofuran volume were investigated. Analytical performance parameters like limit of detection, limit of quantification, preconcentration factor, and relative standard deviation were determined as 6.6 μg L^?1, 21.8 μg L^?1, 15, and <5%, respectively. Validation of the developed method was checked by the analysis of certificated reference materials. The procedure was successfully applied to determination of copper in olive oil and water samples.     

Separation of Copper and Nickel from Ammoniacal/Ammonium Carbonate Solutions Using ACORGA PT5050

ABSTRACT

ACORGA PT5050 diluted with iberfluid (kerosene-type diluent, mostly aliphatic) was used to coextract copper and nickel from ammoniacal carbonate solutions. The influence of kinetics, temperature, equilibrium pH, and extractant concentration on the extraction of both metals has been studied. It was observed that nickel extraction is very sensitive to aqueous pH and that the extraction falls beyond an equilibrium pH of 9. For a typical solution containing near 3 g/L each of copper and nickel and 60 g/L ammonium carbonate, conditions were established for the coextraction and selective stripping of nickel and copper.     

The Transport of Copper(II) through Hollow Fiber Renewal Liquid Membrane and Hollow Fiber Supported Liquid Membrane

Abstract

In this paper, hollow fiber renewal liquid membrane (HFRLM) and hollow fiber supported liquid membrane (HFSLM) were used to simultaneously remove and recover copper(II) from aqueous solutions, and the transport performance of these two techniques were compared under the similar conditions for the system of CuSO₄ +D2EHPA in kerosene +HCl. The results showed that the HFRLM process was more stable than the HFSLM process. The HFRLM process had a higher overall mass transfer coefficient than that of HFSLM process in single-pass experiments. These were because the renewal effect of the liquid membrane layer could reduce the mass transfer resistance of the lumen side and replenish the loss of the membrane liquid in the HFRLM process. The transport results were better in the HFRLM process than that in the HFSLM process with recycling experiments. Therefore, HFRLM technique is a promising method for simultaneous removal and recovery of heavy metal from aqueous solutions.     

合成1-(4-苯基-1,2,3-三氮唑-1-亚甲基)苯并三氮唑的新方法

三氮唑类衍生物具有抗菌、抗炎、抑制病毒生长等广泛的生物活性。从苯并三氮唑出发,通过点击化学反应在水相中合成了1-(4-苯基-1,2,3-三氮唑-1-亚甲基)苯并三氮唑,产率为91%;该合成方法具有简便快速、产率高等优点。