Sonocatalytic degradation of tetracycline hydrochloride with CoFe2O4/g-C3N4 composite

In this work, different mass percent ratios of CoFe₂O₄ coupled g-C₃N₄ (w%-CoFe₂O₄/g-C₃N₄, CFO/CN) nanocomposites were integrated through a hydrothermal process for the sonocatalytic eradication of tetracycline hydrochloride (TCH) from aqueous media. The prepared sonocatalysts were subjected to various techniques to investigate their morphology, crystallinity, ultrasound wave capturing activity and charge conductivity. From the investigated activity of the composite materials, it has been registered that the best sonocatalytic degradation efficiency of 26.71 % in 10 min was delivered when the amount of CoFe₂O₄ was 25% in the nanocomposite. The delivered efficiency was higher than that of bare CoFe₂O₄ and g-C₃N₄. This enriched sonocatalytic efficiency was credited to the accelerated charge transfer and separation of e⁻-h⁺ pair through the S-scheme heterojunctional interface. The trapping experiments confirmed that all the three species i.e. ^•OH, h⁺ and ^•O₂⁻ were involved in the eradication of antibiotics. A strong interaction was shown up between CoFe₂O₄ and g-C₃N₄ in the FTIR study to support charge transfer as confirmed from the photoluminescence and photocurrent analysis of the samples. This work will provide an easy approach for fabricating highly efficient low-cost magnetic sonocatalysts for the eradication of hazardous materials present in our environment.     

无规聚甲基丙烯酸甲酯链的温度系数

本文在旋转异构态理论基础上,建立了双侧基高分子链温度系数的计算公式,由此得到聚甲基丙烯酸甲脂的温度系数从间同链、无规链到全同链呈线性关系,这与实验数值一致.     

氯化血红素/热解石墨电极对单加氧酶的模拟——Ⅱ.苯在氯化血红素/热解石墨电极上的电催化羟基化作用

实验结果支持了血红素(Ha.)的单体(monomer)吸附态对分子氧起电催化还原作用的观点;并表明,H_2O_2的电催化还原主要是在Ha.的二聚体(dimer)吸附态上进行。Ha./电极对苯一步羟基化生成苯酚有电催化作用。     

铜基催化剂催化合成气一步合成甲醇和甲酸甲酯 I.温度和压力的影响(英文)

考察了在低温、低压和浆态反应条件下,由合成气一步直接合成甲醇和甲酸甲酯（ＭＦ）的反应和催化剂。结果表明,不同方法制各的Ｃｕ基催化剂具有不同的催化活性和甲酸甲酯选择性。采用络合沉淀法（ＣＰ）制备的催化剂具有较高的催化活性和ＭＦ选择性。温度和压力对催化剂的活性和ＭＦ选择性具有明显的影响。Ｃｕ－Ｃｒ催化剂的活性随温度和压力的增加而增加,其选择性随温度的升高而降低,随压力的升高而增加。     

BaTiO3纳米颗粒的聚丙烯酰胺凝胶法合成及光催化降解甲基红性能

采用聚丙烯酰胺凝胶法合成了BaTiO3纳米颗粒,利用X射线衍射、傅里叶变换红外光谱、透射电镜和紫外-可见漫反射光谱对样品进行了表征.结果表明,以柠檬酸酸为络合剂、pH=2且在700℃焙烧时可制备出单相BaTiO3纳米颗粒,其形状较为规整,近似呈球形,平均粒径约为55 nm,光学带隙值为3.25 eV.以偶氮染料甲基红为目标降解物,研究了BaTiO3纳米颗粒的光催化性能.结果表明,在紫外光照射下该纳米颗粒表现出较高的催化活性,光催化机理主要为光生空穴的直接氧化.     

STUDY OF Cu-Mu CATALYST FOR THE SYNTHESIS OF METHYL FORMATE AND METHANOL FROM SYNTHESIS GAS

将一种新型的ＣｕＭｎ催化剂用于由合成气合成甲酸甲酯和甲醇，该催化剂表现出良好的反应活性和甲酸甲酯选择性。考察了反应温度、合成气压力及催化剂制备方法等对合成甲酸甲酯和甲醇的反应活性及选择性的影响。在反应条件下，产物收率最高达６０．１０ｇ／（Ｌ·ｈ），产物甲酸甲酯的选择性很高。用ＢＥＴ、ＸＲＤ及ＸＰＳＡｕｇｅｒ等测试方法对催化剂的比表面、晶相组成以及铜、锰在催化剂中的价态进行了表征，并探讨了催化剂失活的原因。     

BiOI/Bi_2WO_6对甲基橙和苯酚的光催化降解及光催化机理(英文)

采用简单的沉积方法制备了不同碘化氧铋含量的BiOI/Bi2WO6光催化剂,通过X射线衍射(XRD)、扫描电子显微镜(SEM)、高分辨透射电子显微镜(HR-TEM)、紫外-可见漫反射光谱(UV-Vis DRS)和BET比表面积测量对其进行了表征。在紫外和可见光的照射下,使用甲基橙和苯酚的光催化降解评价了BiOI/Bi2WO6催化剂的光催化性能。结果表明:与商业P25和纯Bi2WO6相比,13.2%BiOI/Bi2WO6光催化剂具有更高的紫外和可见光催化性能。这明显增加的光催化活性主要归功于光生电子和空穴在Bi2WO6和BiOI界面上的有效转移,降低了电子-空穴对的复合。基于BiOI和Bi2WO6的能带结构,提出了光生载流子的一种转移过程。自由基清除剂的实验表明,·OH,h+,·O2-和H2O2,特别是h+,共同支配了甲基橙和苯酚的光催化降解过程。     

One-Pot Stereoselective Synthesis of Alkyl (Z)-2-[4-Oxo-3-phenyl-2-(phenylimino)-1,3-thiazolan-5-yliden]acetates from Acetylenic Esters and N,N′ -Diphenylthiourea

N, N′ -diphenylthiourea reacts with dialkyl acetylenedicarboxylates in acetone to form 1:1 adducts, which undergo a cyclization reaction to produce alkyl (Z)-2-[4-oxo-3-phenyl-2-(phenylimino)-1,3-thiazolan-5-yliden]acetates in fairly good yields. NMR spectra indicated that the reaction is completely stereoselective.     

The Synthesis of Amino Acid Methyl Ester 5′-Phosphoamidates of Protected Uridine

In this article, we used the Atherton–Todd reaction to synthesize amino acid methyl ester 5′-phosphoamidates of uridine as prodrugs. Their structures were confirmed by ¹H NMR, ³¹P NMR, ¹³C NMR, IR, and mass spectrometry.

Supplemental materials are available for this article. Go to the publisher′s online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file.     

Anti‐static Agent Containing Zinc Oxide and its Modification for PA6 Fiber

A new anti‐static agent was synthesized from zinc oxide‐adipic acid‐polyethylene glycol and caprolactam by three‐step reactions. The antistatic agent (called poly(ether ester amide zinc oxide) or PEEAZ) was analyzed by IR and DSC. The results showed that zinc oxide existed in the main chain of PEEAZ. The glass temperature and melt temperature of poly(ether ester amide zinc oxide) (referred to as PEEAZ in the following) decreased with increasing poly(ether ester zinc oxide) increasing in PEEAZ. Antistatic PA6 fiber was obtained by adding PEEAZ 2–8% (wt/wt) to PA6 during blend spinning. The specific resistance and the static half‐value period of PA6 fiber was less than 10⁹Ω · cm and 60 sec, respectively. Excellent antistatic property remained after being washed 30 times.