Sm-doped g-C_3N_4/Ti_3C_2 MXene heterojunction for visible-light photocatalytic degradation of ciprofloxacin

A heterojunction of Sm-doped g-C_3N_4/Ti_3C_2 MXene(SCN/MX) was constructed via prepolymerization and solid mixture-calcination method.The modified g-C_3N_4 presented a hollow porous seaweed-like shape which can increase its specific area and active sites.In SCN/MX composite,the optical properties,no matter optical absorption ability or separation performance of photo-induced electrons and holes,were enhanced.Among them,Sm-doping may play an important role on transferring the photogenerated electrons to suppress their recombination,and Ti_3C_2 MXene would broaden light absorption and further improve the carrier migration efficiency.The SCN/MX presented higher photocatalytic degradation efficiency( 99%) of cipro floxacin under visible light irradiation.The quenching experiments and electron spin-resonance spectroscopy confirmed that the dominated active materials were superoxide radical and holes.The degradation mechanisms of ciprofloxacin(CIP) over the SCN/MX were attacking of the active materials on the piperazine ring and quinolone ring,and the final products were CO_2,H_2O and F~-.     

Metal complexes derived from hydrazoneoxime ligands: III – Synthesis,characterization and electrospray ionization mass spectra of some nickel(II) complexes with aroylhydrazoneoximes

Five binuclear nickel(II) complexes [{Ni(L-R)}₂] derived from diacetylmonooxime aroylhydrazones (H₂L-R) have been prepared and characterized. In these complexes the oximate group functions as a bridge between the two nickel(II) ions. The corresponding octahedral bisligand complexes [Ni(HL-R)₂] have been also prepared and characterized. Reaction of [{Ni(L-R)}₂] with excess pyrazole (HPyr) afforded square planar [Ni(L-R)HPyr] complexes. The structure of [Ni(L-H)HPyr] (11), [Ni(L-CH₃O)HPyr] (13) and [Ni(L-Cl)HPyr] (14) have been determined by single-crystal X-ray diffraction. In these complexes, the Ni(II) is coordinated to the oximate nitrogen, hydrazone nitrogen and enolimine oxygen of the aroylhydrazoneoxime ligand, the fourth coordination site is occupied by pyrazole nitrogen. In 11 and 13 the molecular units are linked together by intramolecular NH?O hydrogen bonds forming a helical chain propagating along a and b axis respectively. The helical structure is stabilized by CH?O, CH?π and π?π noncovalent interactions. The structure of 14 consists of two independently crystallographic molecular units. The Ni1 molecular units are assembled together by CH?O and CH?Cl1 interactions forming a two dimensional sheet, while the Ni2 units are jointed together by CH?O and CH?C interactions forming a chain extending along b-axis which are enclosed between sheets of Ni1 units.     

气相色谱-质谱法同时测定动物内脏中的14种酞酸酯类环境激素残留

开展了动物内脏中14种酞酸酯类（PAEs）环境激素残留的气相色谱-电子轰击离子源/质谱（GC-EI/MS）的分析方法研究。优化与选择了动物内脏样品的前处理条件,动物内脏样品经正己烷/二氯甲烷（1/1,v/v）混合提取剂超声提取、Florisil硅藻土固相萃取柱净化与乙酸乙酯/正己烷（2/3,v/v）混合洗脱剂洗脱和浓缩后,以邻苯二甲酸二苯基酯（DPhP）为内标物,采用GC-EI/MS的选择离子监测方式（SIM）进行定性和定量分析。当猪肝样品的加标浓度水平为100、200、400 μg/kg时,加标回收率为：60%~110%,相对标准偏差为：0.78%~10.3%;除邻苯二甲酸二（2-甲氧基乙基）酯（DMEP）与邻苯二甲酸二（2-乙氧基乙基）酯（DEEP）的检测限（MDL）分别为3.30与2.25 μg/kg外,其余的12种PAEs的MDL ≦ 1.74 μg/kg;线性范围为50 ~ 800 μg/kg,相关系数都大于0.9994。此分析方法成功地应用于6种动物内脏中14种痕量PAEs残留的分析。     

可拉伸聚合物基复合固体电解质研究进展

未来可穿戴电子器件和系统需要柔性电池提供致密、 安全且可靠的电能源保障. 发展兼具可拉伸性和高离子电导率的固体电解质技术是实现全固态锂电池柔性化, 进而满足上述要求的关键之一. 本文综合评述了提升聚合物基复合固体电解质离子传导性能的主要机制和研究进展, 分析了在不同尺度下解耦离子传导和力学承载功能, 进而在弯折、 拉伸等形变工况下维持离子传导性能稳定的策略, 介绍了有助于推动可拉伸聚合物基复合固体电解质研究的几类先进表征技术, 并展望了未来研究工作的重点方向.     

轻原子成像法的建立及其新进展

介绍了利用高分辨电子显微不进行晶体结构分析的一种方法－轻原子成像法的建立过程及其在铜,镍,银等金属的初期氧化产物结构分析中的应用,介绍了利用轻原子成像法的思想解决厚膜上观察表面结构的可能性问题的新进展。     

铅基反应堆自然循环与应急余热排出研究

自然循环特性是铅基反应堆一回路的关键运行特性,对反应堆的非能动应急余热排出具有重要的影响,自然循环特性与余热排出能力是反应堆热工水力研究的重要内容。采用多孔介质方法,建立了CiADS铅基堆1/4三维计算模型,使用FLUENT程序对额定工况与低功率工况进行稳态计算。为了研究全厂断电事故下的余热排出过程,从热工水力的等效原则出发,尝试建立二维等效模型以提高瞬态计算效率。结果表明,CiADS铅基堆具备低功率自然循环运行能力和一定的事故容错能力;二维等效模型与三维模型计算结果吻合较好,可用于瞬态下的简化分析;CiADS铅基堆的非能动余热排出系统能够较好地应对全厂断电事故,反应堆具有良好的固有安全性。     

Structure,reactivity and luminescence studies of triphenylsiloxide complexes of tetravalent lanthanides

Among the 14 lanthanide elements (Ce–Lu), until recently, the tetravalent oxidation state was readily accessible in solution only for cerium while Pr(iv), Nd(iv), Dy(iv) and Tb(iv) had only been detected in the solid state. The triphenylsiloxide ligand recently allowed the isolation of molecular complexes of Tb(iv) and Pr(iv) providing an unique opportunity of investigating the luminescent properties of Ln(iv) ions. Here we have expanded the coordination studies of the triphenylsiloxide ligand with Ln(iii) and Ln(iv) ions and we report the first observed luminescence emission spectra of Pr(iv) complexes which are assigned to a ligand-based emission on the basis of the measured lifetime and computational studies. Binding of the ligand to the Pr(iv) ion leads to an unprecedented large shift of the ligand triplet state which is relevant for future applications in materials science.

The first observed luminescence emission spectra of Pr(iv) complexes are assigned to a ligand-based emission. Binding of the triphenylsiloxide ligand to the Pr(iv) ion leads to an unprecedented large red shift of its triplet state.     

Upgrading Common Wheat Pasta by Fiber-Rich Fraction of Potato Peel Byproduct at Different Particle Sizes: Effects on Physicochemical,Thermal, and Sensory Properties

Fiber-enriched food has numerous health benefits. This study develops functional fiber-enriched pasta (FEP) by partially substituting wheat flour for alcohol-insoluble residue prepared from potato processing byproducts (AIR-PPB) at various particle sizes (PS). The independent variables’ effects, AIR-PPB at 2–15% substitution levels, and PS 40–250 µm were investigated in terms of chemical, cooking, thermal, and sensory properties. AIR-PPB is rich in total dietary fibers (TDF) (83%), exhibiting high water-holding capacity (WHC) and vibrant colors. Different concentrations of AIR-PPB increase TDF content in FEPs by 7–21 times compared to the control pasta (CP). Although the optimal cooking time (OCT) decreases by 15–18% compared to CP, where a lower OCT should reduce cooking time and save energy, cooking loss (Cl) increases slightly but remains within an acceptable range of 8%. Additionally, AIR-PPB altered the texture properties of FEP, with a moderate decrease in mass increase index (MII), firmness, and stickiness. AIR-PPB impairs the gluten network’s structure in pasta due to AIR-PPB’s WHC, which competes with starch for water binding, increasing the starch gelatinization temperature. FEPs show an increased lightness and yellowness and improved sensory properties. Highly acceptable FEPs were obtained for the following substitution levels: FEP11 (AIR-PPB at 2% and PS of 145 µm), FEP9 (AIR-PPB 4% level with PS of 70 µm), FEP6 (AIR-PPB of 4% level with 219 µm PS), and FEP1 (AIR-PPB = 8.5% with 40 µm PS), as compared to other FEPs.     

Treatment of nanofluid within porous media using non-equilibrium approach

Journal of Thermal Analysis and Calorimetry - Lorentz force impact on heat transfer was scrutinized in current paper, and nanomaterial behavior was analyzed within a domain which has been...     

Ytterbium (II) Hydride as a Powerful Multielectron Reductant

A dimeric β-diketiminato ytterbium(II) hydride affects both the two-electron aromatization of 1,3,5,7-cyclooctatetraene (COT) and the more challenging two-electron reduction of polyaromatic hydrocarbons, including naphthalene (E⁰=−2.60 V). Confirmed by Density Functional Theory calculations, these reactions proceed via consecutive polarized Yb−H/C=C insertion and deprotonation steps to provide the respective ytterbium (II) inverse sandwich complexes and hydrogen gas. These observations highlight the ability of a simple ytterbium(II) hydride to act as a powerful two-electron reductant at room temperature without the necessity of an external electron to initiate the reaction and avoiding radicaloid intermediates.