呋咱类含能材料合成进展

慨述了呋咱类含能材料的合成进展。

微波技术在处理煤化工污水中难降解有机物的工程化设计探索

煤化工废水中多环苯类有机物引起的化学性水污染很难处理,利用微波能技术处理化工污水中多环苯类有机物是近年研究的热点。为提高有机物降解效率,提高微波在污水内的作用深度和均匀性,本文介绍了一种对污水中有机物先富集后处理的降解方法,给出了微波诱导法处理煤化工污水的试验方案,并给出大功率四同轴天线阵激励谐振腔体的设计方案。

真空微波管技术在降解煤化工污水类POPs物质的应用研究

持久性有机污染物(POPs)对人类健康和环境具有严重危害,煤化工废水中多环苯类有机物引起的化学性水污染是最难处理的污染源,利用微波能技术特点辅助处理在化工污水中多环苯类有机物是近年研究热点,也是真空大功率微波器件发展新的市场出路。本文介绍了微波法辅助处理化工污水的机理及实验室结果并设计出一种对煤化工污水中永久有机物先富集后微波辅助降解类POPs物质的工艺方法和微波作用腔体的型式,此项工作对微波辅助降解化工污水中类POPs物质的工业化实施有较大启发借鉴作用。

多六隅图完备匹配计数的一种新方法

多六隅图有着十分明显的理论化学背景 ,其完备匹配的计数是一个广泛研究的课题。本文通过定义一种特殊矩阵 ,从而给出了一类多六隅图完备匹配计数的显式表达式。

Photoionization Mass Spectrometric and Kinetic Modeling of Low-pressure Pyrolysis of Benzene

Pyrolysis of benzene at 30 Torr was studied from 1360 K to 1820 K in this work. Synchrotron vacuum ultraviolet photoionization mass spectrometry was employed to detect the pyroly- sis products such as radicals, isomers and polycyclic aromatic hydrocarbons, and measure their mole fraction profiles versus temperature. A low-pressure pyrolysis model of benzene was developed and validated by the experimental results. Rate of production analysis was performed to reveal the major reaction networks in both fuel decomposition and aromatic growth processes. It is concluded that benzene is mainly decomposed via H-abstraction reaction to produce phenyl and partly decomposed via unimolecular decomposition reac- tions to produce propargyl or phenyl. The decomposition process stops at the formation of acetylene and polyyne species like diacetylene and 1,3,5-hexatriyne due to their high thermal stabilities. Besides, the aromatic growth process in the low-pressure pyrolysis of benzene is concluded to initiate from benzene and phenyl, and is controlled by the even carbon growth mechanism due to the inhibited formation of C5 and C7 species which play important roles in the odd carbon growth mechanism.

Vapor-Liquid Equilibrium of Toluene-Polycyclic Aromatic Hydrocarbon System in Sub- and Supercritical State

The phase behaviors of toluene/polycyclic aromatic hydrocarbon mixture systems were investigated with a continuous-flow type apparatus at 573.2, 598.2, 623.2 and 648.2 K, while the pressure changed from 1 to 5MPa. The pseudo-binary phase behaviors were predicted with the Peng-Robinson equation of state with interaction parameters between toluene and pseudo-components considered. The phase diagrams of the system have been classified following the category of phase boundary diagram models. The extraction selectivity and efficiency of tolu-ene as a solvent was discussed by comparing with that of hexane. The prediction model for selectivity was also suggested.

Pollution of HCHs,DDTs and PCBs in tidal flat of Hangzhou Bay 2009–2013

The concentration and distribution of three persistent organic pollutants （hexachlorocyclohexanes （HCHs）, dichlorodiphenyltrichloroethanes （DDTs） and polyehlorinated biphenyls （PCBs）） was assessed in tidal fiat sediments collected from the south bank of Hangzhou Bay, China from 2009 to 2013. Gas chromatography coupled to triple quadrupole mass spectrometry （GC-MS/MS） was used for analysis, based on United States Environmental Protection Agency methods EPAS080A, EPA8081B, and EPA3550B. The results showed that the levels of HCHs, DDTs and PCBs decreased in the order of DDTs 〉 HCHs 〉 PCBs, and their mass fractions ranged from 0.29-32.91, 0.09-13.19 and 0.16-4.10 ktg/kg （dry mass）, respectively. The levels of HCHs, DDTs and PCBs decreased slowly from 2009 to 2013, with considerably greater concentrations in winter than in spring and summer. In this study area, the concentrations of DDTs and HCHs decreased gradually towards the mouth of Hangzhou Bay, while the concentrations of PCBs were related to changes in the local economy. In addition, the sources of HCHs and DDTs were identified as atmospheric precipitation and historical residues, Finally, we predicted that PCBs pollution primarily originated from Aroclor 1254（Lot A4）, which might root in the illegal demolition and stacking of abandoned paint, transformer or electronic equipment in the south bank of Hangzhou Bay.

Quality, Quantity and Origin of PAHs （Polycyclic Aromatic Hydrocarbons） in Lotic Ecosystem of Al-Hilla River, Iraq

The Euphrates River is one of the major rivers in Iraq. When it reaches north of Hilla city, it will be divided in two branches. One of these braches flows toward Hilla city. On this branch, six locations were studied for the water quality of the Euphrates water. The present paper is aimed to fill the gap of information of the presence of PAHs （poly aromatic hydrocarbons） in water and sediment of AI-Hilla River, as well as to determine the quality and quantity of some PAHs. The depth of the river ranges from 2 m to 6 m. The quality, quantity and the origin of PAHs were studied in the water and sediment of Al-Hilla River. In addition, some physical and chemical properties were studied at six sites along the studied area, for the period March, 2010 to February, 2011. Sixteen PAHs that are listed by USEPA （US Environmental Protection Agency） as priority pollutants （Nap （naphthalene）, Acpy （acenaphthylene）, Acp （acenaphthene）, Flu （fluorine）, Phen （phenanthrene）, Ant （anthracene）, Flur （fluoranthene）, Py （pyrene）, B（a）A （benzo（a）anthracene）, Chry （chrysene）, B（b）F （benzo（b）fluoranthene）, B（k）F （benzo（k）fluoranthene）, B（a）p （benzo（a）pyrene）, BbA （dibenzo（a,h）anthracene）, B（ghi）P （benzo（ghi）perylene） and Ind （indeno （1,2,3-cd） pyrene）） were detected in Al-Hilla river. High concentrations of PAHs were detected in the sediment relative to that within the water. The present study revealed that the origin of PAHs in water and sediment might be the pyrogenic origin.

The detection and significance of polycyclic aromatic hydrocarbons in human pancreatic cancer

Objective:The aim of this study was to investigate the effect of polycyclic aromatic hydrocarbons (PAHs) on the occurrence of human pancreatic cancer.Methods:PAHs in human pancreatic cancer,adjacent pancreatic cancer tissues and tissues without pancreatic cancer were extracted by ultrasonic extraction (UE).And then the extracts were cleaned up by solid phase extraction and analyzed by high performance liquid chromatography (HPLC) with fluorescence spectroscopy.Results:Four kinds of PAHs were detected,which were chrysene,2-methylanthracene,pyrene and benzo (a) pyrene.The contents of the four PAHs were not statistically significant between pancreatic cancer and adjacent tissues (P > 0.05).The contents of 2-methylanthracene,pyrene and benzo (a) pyrene in pancreatic cancer and adjacent tissues were higher than tissues without pancreatic cancer,the differences were statistically significant (P < 0.05).The contents of chrysene in the three kinds of pancreatic tissues were not statistically significant (P > 0.05).Conclusion:PAHs were found in human pancreatic tissues.Human pancreatic tissues have extremely strong ability of bio-concentrating PAHs.PAHs might play an important role in the occurrence of human pancreatic cancer.

Zeolite-Encapsulated Fe（lll） Complex with 5,10,15,20-Tetraphenyl Porphyrin as Heterogeneous Catalysts for Epoxidation of α-Pinene： Synthesis, Characterization and Catalytic Activity

In this paper iron complex with 5,10,15,20-tetraphenyl porphyrin inside NaX zeolite nanocages was capsuled. All synthesized homogeneous and heterogeneous catalysts were applied for epoxidation of α-pinene. It has been shown that hydrophobic porphyrins are anchored inside the zeolite pores according to flexible ligand method. It also has been examined that capsulation of metalloporphyrins inside the pores of solid supports change catalytic activity and stability. All catalysts were characterized by Fourier transform infrared （FTIR）, UV/Vis diffuse reflectance spectroscopic （DRS）, scanning electron microscopy （SEM） analyses to confirm the complexes immobilization.

The PCDD/PCDF Dioxin Releases in the Climate of Environment of Jordan in the Period (2000-2008)

Many environment problems of the full using of several categories of processing include mining,heat generators,direct combustion of forest fires,cement production,power plant,transport,medical waste.Dioxin/furan releases from these categories are one of these environment problems.Possible lines of reducing the PCDD/PCDF (Polychlorinated dibenzo-para-dioxins/Polychlorinated dibenzofurans) releases from these categories are elucidated.The contribution of this paper is present the identification and estimation of the latest figure of dioxin/furan releases in the climate of environment of Jordan in the period 2000-2008 from the following categories (cement,aluminum,ceramic,medical waste,power plant,land fill,ferrous and non-ferrous metals,uncontrolled combustion process (biomass burning,waste burning,accidental fires in house,transport).These finding shows the sign of growth of estimated PCDD/PCDF releases from categories which did not calculated and followed after 2003.The result shows the highest PCDD/PCDF release from landfill fires (62.75 g TEQ/year),medical waste (8.8264 g TEQ/year),and transport (3.0145 g TEQ/year).Jordan seeks by next years,a reduction in total releases of dioxins and furans from sources resulting from human activity.This challenge will apply to the aggregate of releases to the air nationwide and of releases to the water within the Jordan area.Jordan should conduct air monitoring for dioxin in order to track fluctuations in atmospheric deposition levels.

An antiferromagnetic {Mn_8} ring supported by planar multidentate ligands

Complexation of the planar multidentate ligand 3,5-bis-（2-hydroxyphenyl）pyrazole （H3L） with manganese chloride leads to the formation of the polynuclear complex [MnIHsL4Oa（MeO）a（MeOH）8] （1）. 1 has an octanuclear macrocyclic core in which the MnnI ions are bridged by four L molecules to form a ring type structure. Antiferromagnetic interactions were shown to be op- erative between metal centers.