Biological N Removal from Wastes Generated from Amine-Based CO2 Capture: Case Monoethanolamine

Large-scale amine-based CO₂ capture will generate waste containing large amounts of ammonia, in addition to contaminants such as the actual amine as well as degradation products thereof. Monoethanolamine (MEA) has been a dominant amine applied so far in this context. This study reveals how biological N removal can be achieved even in systems heavily contaminated by MEA in post- as well as pre-denitrification treatment systems, elucidating the rate-limiting factors of nitrification as well as aerobic and denitrifying biodegradation of MEA. The hydrolysis of MEA to ammonia readily occurred both in post- and pre-denitrification treatment systems with a hydraulic retention time of 7 h. MEA removal was ≥99?±?1 % and total nitrogen removal 77?±?10 % in both treatment systems. This study clearly demonstrates the advantage of pre-denitrification over post-denitrification for achieving biological nitrogen removal from MEA-contaminated effluents. Besides the removal of MEA, the removal efficiency of total nitrogen as well as organic matter was high without additional carbon source supplied.     

Development of colloidal gold-based immumochromatographic assay for the rapid detection of medroxyprogesterone acetate residues in biological materials

A competitive colloidal gold-based immunoassay in lateral-flow format for the rapid detection of medroxyprogesterone acetate (MPA) in biological materials was developed. A nitro-cellulose membrane strip was separately coated with goat anti-rabbit IgG (control line) and MPA hapten-OVA conjugate (test line). Anti-MPA polyclonal antibody labelled with colloidal gold particles was first incubated with MPA. The limit of detection for lateral flow was 5?ng?g^?1 for detecting an MPA standard solution, and the limit of detection was 10?ng?mL^?1 for detecting the MPA spiked in pig urine and 10?ng?g^?1 for spiked in pig liver. The results were confirmed by high-performance liquid chromatography tandem mass spectrometry (HPLC/MS/MS) and indicated that there was a good agreement between both methods (R ²?=?0.976). The assay time for the test was less than 5?min, suitable for rapid testing on site.     

纸张物证的分析检验方法

纸张是犯罪现场经常出现的物证。对纸张物证的分析检验在案件侦破中有着重要作用,因此,法庭科学工作者一直对纸张物证的检验方法进行深入研究。随着法庭科学实验室的发展,纸张的检验技术得到了长足的进步,由传统的单一仪器分析方法发展到现在多种分析技术的联合应用,从而建立了快速、有效、灵敏的检验方法,为涉及纸张物证的案件侦破做出了显著的贡献。本文对纸张物证的分析检验方法进行了介绍和讨论。     

双功能配体促进的钯催化不对称醚化和胺化反应（英文）

研究双亚砜膦配体(BiSO-P)亚砜基团的Bronsted碱性在协同催化反应中的作用.1H NMR研究表明双亚砜膦与醇和胺等质子试剂形成氢键;并将此类配体应用于钯催化的不对称醚化和胺化反应,最高获得99%ee.研究发现氢键的存在能有效提高反应的ee值,配体亚砜基团在反应过程中同时起着Lewis和Bronsted碱的作用.     

Synthesis and characterization of biphenyl liquid crystal based on natural molecules and 2(5H)-furanone moiety

Using 4′-hexyloxybiphenyl-4-ol and N-(5-alkoxy-3-bromo-2(5H)-furanonyl) amino acids as reactants, a series of novel biphenyl liquid crystal compounds containing natural molecule moieties, such as menthol, borneol, and amino acids, were synthesized via esterification. The structures of all novel compounds were confirmed by FTIR, ¹H NMR, ¹³C NMR, MS, and elemental analysis, and the liquid crystal properties of target compounds were characterized with DSC, XRD, and POM. The introduction of hexyloxy made the biphenyl esters have a potential to appear in mesomorphic phase and have a higher Tm, and bornyl moiety was more beneficial for the liquid crystal performance than a menthyl unit. Most compounds were mesomorphic phase liquid crystal molecules, and POM and XRD showed that they existed in smectic phase. These researches provide a theoretical basis for the synthesis of biphenyl ester liquid crystal materials via the utilization of 2(5H)-furanone derivates and natural molecules.     

Excellent degradation performance of azo dye by metallic glass/titanium dioxide composite powders

The metallic glass/titanium dioxide powders (MG/TiO₂) with enhanced photocatalytic oxidation activity were synthesized, which exhibit a higher efficiency in decolorizing methylene blue solutions (MB). Compared with the pure TiO₂ and crystalline alloy/TiO₂ (CA/TiO₂) under the same circumstances, its degradation rate was 60 % and 30 % higher, respectively. Furthermore, compared with the CA/TiO₂, the MG/TiO₂ photocatalytic rate was three times faster when decolorizing MB. Considering the excellent intrinsic high-performance photocatalytic degradation under visible light irradiation, these novel powders were proven to have potential applications in water purification industry.     

The Redox‐Neutral Approach to C?H Functionalization

The direct functionalization of C? H bonds is an attractive strategy in organic synthesis. Although several advances have been made in this area, the selective activation of inert sp³ C? H bonds remains a daunting challenge. Recently, a new type of sp³ C? H activation mode through internal hydride transfer has demonstrated the potential to activate remote sp³ C? H linkages in an atom‐economic manner. This Minireview attempts to classify recent advances in this area including the transition to non‐activated sp³ C? H bonds and asymmetric hydride transfers.     

Electrospun Porous NiCo2O4 Nanotubes as Advanced Electrodes for Electrochemical Capacitors

Novel, porous NiCo₂O₄ nanotubes (NCO‐NTs) are prepared by a single‐spinneret electrospinning technique followed by calcination in air. The obtained NCO‐NTs display a one‐dimensional architecture with a porous structure and hollow interiors. The effect of precursor concentration on the morphologies of the products is investigated. Due to their unique structure, the prepared NCO‐NT electrode exhibits a high specific capacitance (1647 F g^?1 at 1 A g^?1), excellent rate capability (77.3 % capacity retention at 25 A g^?1), and outstanding cycling stability (6.4 % loss after 3000 cycles), which indicates it has great potential for high‐performance electrochemical capacitors. The desirable enhanced capacitive performance of NCO‐NTs can be attributed to the relatively large specific surface area of these porous and hollow one‐dimensional nanostructures.