电Fenton法处理难降解废水的研究进展

用基于产生强氧化剂-羟基自由基的高级氧化技术处理难降解废水已成为近年来的研究热点,而高级氧化技术中的电Fenton法又以其独特的优点倍受人们的青睐.根据电生成Fenton试剂方法的不同,概括了电Fenton法的主要类型及其机理,介绍了各类型的优缺点及其在国内外的研究状况.同时,还介绍了电Fenton法与其它废水处理技术的联合工艺,对难降解废水具有很好的处理效果.最后,指出电Fenton法今后研究发展方向.     

电Fenton法处理难降解废水的研究进展

用基于产生强氧化剂一羟基自由基的高级氧化技术处理难降解废水已成为近年来研究热点。而高级氧化技术中的电Fenton法又以其独特的优点倍受人们的青睐。根据电生成Fenton试剂方法的不同。概括了电Fenton法的主要类型及其机理,介绍了各类型的优缺点及其在国内外的研究状况。同时,还介绍了电Fenton法与其它废水处理技术的联合工艺,对难降解废水具有很好的处理效果。最后,指出电Fenton法今后研究发展方向。     

Fenton及其联合法处理有机废水的研究进展

Fenton法是高级氧化技术的典型代表。采用Fenton法及其各种联合方法处理难降解有机废水,是水处理领域的一个研究重点。综述了Fenton法、超声波Fenton法、电Fenton法、光Fenton法、微波Fenton法等处理有机废水的研究进展,介绍了各种废水处理方法的特点及应用实例,并探讨了各方法存在的问题及今后的研究方向。     

高级氧化技术在难降解有机废水中的研究及应用

对难降解有机废水的处理技术,是目前水处理技术的重要研究课题之一。高级氧化法以其自身独有的特点日趋成为处理难降解有机废水的重要技术之一。介绍了高级氧化方法的特点和高级氧化法处理难降解有机废水的研究及应用现状,并阐述了高级氧化技术中的高级湿式氧化、臭氧氧化、Fenton试剂法、超声波氧化等重要高级氧化技术。通过高级氧化技术的研究和应用现状及现今存在的问题的分析,指出高级氧化技术工业化发展的方向。     

高级氧化技术处理染料废水的研究进展

由于染料废水中含有高浓度难降解有机污染物,对其有效处理一直是个难题.综述了近几年国内外采用湿式氧化法、Fenton法、光化学与光催化氧化法、电化学法、臭氧氧化法、微波辅助氧化法和超声氧化法等高级氧化技术处理染料废水的进展情况,并指出了高级氧化技术在染料废水处理中的发展趋势.     

Fenton法处理印染废水的研究现状

印染废水是一种难处理工业废水，不仅有机污染物浓度高，而且色度指标也高。若不进行有效处理，将严重污染水环境。高级氧化法是处理难降解废水的有效方法，其中Fenton法及其改进方法处理印染废水的研究近几年开展的比较多。从传统Fenton法处理印染废水出发，介绍Fenton法的改良对难处理废水的处理效果，进而具体介绍电Fenton法处理印染废水的研究现状。     

Fenton试剂在处理难降解工业有机废水中的应用

Fenton试剂作为一种高级氧化技术在高浓度、难降解和有毒有害工业有机废水的处理研究中被广泛应用,并取得了显著的成果。综述了Fenton试剂在焦化废水、垃圾渗滤液、印染废水和农药废水处理中的应用研究进展。指出:进一步开展Fenton试剂与混凝沉降、活性炭吸附、生化、光催化等方法组合处理技术的研究,减少药剂投加量降低水处理成本;拓宽pH使用范围和寻求铁离子的固定化技术,应是今后Fenton试剂处理难降解工业有机废水的发展方向。     

多种技术与Fenton法联合在废水处理中的应用

Fenton法是一种在处理难生物降解有机物废水方面有独特优势的废水处理技术。Fenton法、微波法、超声法、吸附法、混凝法、生物法,每种技术在废水处理方面都各有特点,Fenton法与这些技术联用时能有效提高废水的处理效果。Fenton法与多种技术联合处理废水是难降解废水研究的发展方向。文章介绍了Fenton法与多种技术联用在废水处理中的应用。     

Fenton氧化技术处理难降解工业有机废水研究进展

系统地分析了各种Fenton氧化技术对有机污染物的降解机理,概述了Fenton氧化技术在处理化工废水、印染废水、制药废水、农药废水和含油废水等难降解工业有机废水中的应用研究进展,认为拓宽Fenton氧化体系的pH响应范围,开展Fe2 /Fe3 固定化技术研究是今后的研究重点,Photo-Fenton和E1ectro-Fenton将是今后Fenton氧化体系的两大发展方向.     

Fenton及类Fenton氧化在高浓度难降解有机废水处理中的研究进展

随着工业的迅速发展,越来越多的有机物被广泛运用于工业生产,高浓度难降解的有机废水成为工业水处理的一个难点。阐述了Fenton试剂及光助Fenton、电Fenton以及超声Fenton氧化法处理有机废水的特性,概述了羟基自由基(·OH)的产生机理,对Fenton试剂及类Fenton试剂在有机废水处理上的应用状况进行了总结。     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。