为高效电还原碱性废水中的Cr(Ⅵ),利用电化学工作站和三电极体系,研究泡沫铁在碱性条件下对Cr(Ⅵ)的电还原去除,考察泡沫铁和不锈钢网分别作为对电极、不同电流密度对Cr(Ⅵ)去除率的影响,并结合电催化析氢(HER)原理深入探索泡沫铁作为电极在碱性条件下电还原去除Cr(Ⅵ)的机理.结果表明:泡沫铁作为对电极的反应速率是不锈钢网的8倍以上;当电流密度为3 mA/cm2时,泡沫铁作为对电极和工作电极电还原去除Cr(Ⅵ)(20 mg/L)的效果最好,在80 min时去除率达到97.89％.

本文从落实新时代全国高等学校本科教育工作会议精神,加快振兴本科教育,构建高水平人才培养体系,全面提高高校人才培养能力的视角,介绍了新时代对高校教师提出的新要求,强调要牢记使命,明确意识到肩负的国家使命和社会责任,履行教师的职责.

为了提高学生的综合素质,本文提出了有机化学教学方式和教学内容的改进方法:在教学实践中,注重理论联系实际能力的培养及安全意识的培养;采用探索性、研究性的教学方法;引入学科发展前沿及绿色化学的理念,引导学生进行研究性学习.采用上述教学模式不仅能提高有机化学的教学效果,而且对提升学生的综合素质具有推动作用.

We reported a simple protocol to prepare a novel carbonaceous solid acid (CSA) with SiO2 from a mixture of rice husk and phenol by using small amount of sulfuric acid while stirring and heating for dehydration, sulfonation and carbonation at 240 degrees C for 2 h. It was found that adding phenol was vital for enhancing properties of the obtained CSA, and the CSA was efficient and recyclable catalyst for production of biodiesel, with the conversion of oleic acid reaching 94.3% at 65 degrees C for 4 h. Moreover, the conversion still was 90.2% after the CSA had been used five times. (C) 2017 Elsevier B. V. All rights reserved.

有机化学是一门重要的专业基础课,由于其教学内容多,难度大,学生的学习效果往往并不理想.笔者拟在教学工作中,通过着重培养学生的自主学习能力,来达到提高有机化学教学效果的目的,并对如何提高学生的自主学习能力进行了初步的探讨.

This article reported a facile route to prepare β-ferrous oxalate dihydrate layered nanosheets using ferrous sulfate and oxalic acid by simple mechanochemical (grinding) method and convert to α-FeOx by aging treatment at 100°C for 10h. As-obtained samples were characterized by X-ray powder diffraction patterns, scanning electron microscopy images, Fourier transform infrared spectra and ultraviolet–visible diffuse reflection spectra, respectively. Their photocatalytic performances were evaluated by the degradation of rhodamine B under visible-light illumination. It was found that both were efficient photocatalysts.

Highly ordered mesoporous silica was prepared with the assistance of phosphate at a pH of 6.15 using sodium silicate as a silicon source.

有机化学是一门重要的专业基础课，由于其教学内容多，难度大，学生的学习效果往往并不理想。笔者拟通过增加网络视频教学方式来达到提高有机化学教学效果的目的，并对网络视频教学模式的意义及实施方案进行了初步的探讨。随着现代科技的创新和发展，以及教学手段的多样化，高校教师应该与时俱进，不断调整和完善教学内容及方式，才能够达到更为良好的教学效果。

The Na2Zr(PO4)2 with morphologies of microflower or square-like sheet were prepared from phosphate solution and zirconium oxychloride by hydrothermal treatment at 180°C for a short time. It was found that the different phosphate solution conditions played a vital role in crystal growth of Na2Zr(PO4)2. The morphology, structure and composition of the products were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier Transforms Infrared (FT-IR) and X-ray photoelectron spectroscopy (XPS). The obtained Na2Zr(PO4)2 had well ion exchange property and was easily converted to crystalline zirconium hydrogen phosphate with multilayer structure, which could be used in intercalation chemistry and as catalyst. Thus, it also provided a novel route to prepared crystalline zirconium hydrogen phosphate.

Selective leaching of Mg in Mg modified mesoporous hematite promotes highly efficient wet peroxide oxidation of methylene blue.

A highly porous Fe2O3/KIT-6 with Mg substitution (MgO@Fe2O3/KIT-6) has been synthesized through a coincipient wetness impregnation of Fe and Mg into ordered mesoporous KIT-6 silica. The postreactio...

A novel mesoporous Fe/KIT-6 catalyst was prepared by simple wetness impregnation technique. The impregnation of metal species did not alter the well-ordered three-dimensional cubic Ia3d mesostructure of KIT-6. This novel impregnated Fe/KIT-6 catalyst showed high degradation efficiency for methylene blue. The effects of catalyst loadings, pH, Fe content and H2O2 dosage were investigated. At neutral pH, 2600 mg L-1 of H2O2 dosage and initial 30 mg L-1 of methylene blue concentration, over 90% methylene blue degraded in 80 minutes with 15 wt-% Fe/KIT-6. With increasing of Fe loading from 5 to 20 wt-%, degradation efficiency decreased after increasing. The reason may lie in the confinement of nanoparticles inside micropores or mesopores with high Fe content. The degradation of methylene blue might be due to the heterogeneous Fenton oxidation of Fe/KIT-6 catalyst and homogeneous Fenton of leached iron ions from the catalyst.

Mesoporous chitosan-silica composite sorbent has been successfully synthesized by a simple and facile template-free hydrolyzing route from single cheap silica precursor of sodium silicate. The overall decolorization efficiency and capacity for sugar juice between pure chitosan and composite sorbent are very close in field pilot-scale, while much lower quantity of chitosan (only 10 wt.%) is used to build the composite sorbent. The success of increased purification performance and sorption capacity of sugar juice is ascribed to the appropriate pore structure of the composite sorbent with high surface area (395 m2/g), large pore size (7.73×10-9 m) and high percentage of accessible free amine groups of chitosan (70 %).

A facile one-pot method for silver phosphate-mesoporous silica composite was reported. In the synthesis procedure, sodium silicate was firstly added dropwise to acidic Pluronic P123 and silver nitrate aqueous solution, followed by addition of phosphate to adjust the pH to near-neutral. Through the salting-out and flocculation effect of phosphate, tiny silver phosphate particles and silicate oligomers were formed and mixed together to build the composite material. It was a new type of mesoporous silica composite which had a structure similar to SBA-15. And it was found to have higher photocatalytic activity than pure silver phosphate in the degradation of methyl orange under ultraviolet light irradiation. (C) 2014 Elsevier Inc. All rights reserved.

有机化学是一门复杂抽象的专业基础课，学生学习的难度较大，因此在有机化学课堂教学过程中，如何提高学生的学习兴趣，学习热情，加深学生对于理论知识的理解和掌握程度是摆在所有有机化学授课教师面前的一个重要课题。经过实践的探索和尝试，笔者提出了采用视频教学提高教学质量的方法，并对该方法的实施进行了深入探讨。采用该方法进行有机化学课程的教学，将有效的提高有机化学课堂教学效率，达到事半功倍的教学结果。

本文介绍了在有机化学实验己二酸制备方面所做的改革工作。通过问题引导教学法，利用过氧化氢氧化环己烯制备己二酸有利于培养学生的实验兴趣，创新思维和环境保护的意识，有利于提升有机化学实验的教学内容和教学质量。

A facile one-pot method for zirconium phosphate-containing mesoporous silica (ZrP-MS) using sodium silicate and zirconium oxychloride was reported under acidic P123 aqueous solution followed by an aid of phosphate. The obtained ZrP-MS material is a new type of mesoporous silica composite, which had a structure similar to SBA-15 but with larger mean pore diameter. Zirconium phosphate was uniformly distributed in the silica, and it was found to be a unique photocatalyst for the degradation of rhodamine B (RhB) by comparison with ZrP-MS, silver-activated ZrP-MS and silver phosphate-mesoporous silica composites on degradation of RhB and methyl orange, in which the reaction kinetics, luminescence properties of the final products of RhB degradation, fluorescence of ZrP-MS-adsorbed RhB, and free radical capture experiment were performed. The formation and photodegradation mechanism of ZrP-MS are discussed.

We reported a simple route to prepare carbonaceous nanospheres (CNSs) (20–30nm in diameter) from bagasse using a mixture of phosphoric and sulfuric acids while stirring at 50°C for 30min followed by heating for dehydration at 220°C for 1h. It was found that the CNSs were efficient catalysts and recyclable for the esterification of citric acid with n-butanol, in which the esterification rate reached 87.88% for 4h. Meanwhile, luminescent carbonaceous dots were found on the surface of the CNSs. Their maximum emission wavelength was at 425nm under excitation with 330nm wavelengths. The quantum yield was 2.7% under 330nm excitation wavelengths.

We reported a simple route to prepare strong solid protonic acids (SPAs) from waste expanded polystyrene using a small amount of sulfuric acids while stirring at 130°C for 3h followed by heating at 220 or 260°C, respectively, for 2h. Such SPAs were amorphous carbon materials. It was found that they were efficient and recyclable catalysts for acid-catalyzed esterification reaction. Meanwhile, luminescent carbon dots were found on the surface of the obtained SPAs at 220°C. The photoluminescence emission peak position shifted from 415 to 542nm as the excitation wavelengths progressively increased from 310 to 470nm. The quantum yield was 13.2% at 310nm excitation wavelengths.

A simple and effective route to improve the fluorescence of carbon dots is reported. A weak fluorescent solution was obtained by a diminution step to obtain tiny particles from bagasse-based carbonaceous blocks. This solution was subjected to hydrothermal treatment under alkaline conditions to improve its fluorescent performance. The luminescence was found to be improved by more than 20-fold after hydrothermal treatment. The ultraviolet absorption and the surface structure were also significantly changed. The alkaline hydrothermal process was shown to involves hydrolysis, isomerization, dehydration, and polymerization that causes the formation of the C=C double bonds and conjugated structures. The optimum hydrothermal conditions were at 200 degrees C for 8 h, and the most appropriate ratio of NaOH to the amount of the weak fluorescent solution was 38-40 mg to 1 mL.