水蒸气-微波法制备颗粒活性炭新工艺

研究了以椰壳炭化料为原料 ,采用水蒸气 微波法制备颗粒活性炭的可行性。探讨了微波功率、活化时间及水蒸气流量对活性炭性能的影响。得到了水蒸气 微波法制备颗粒活性炭的最佳工艺条件 :微波功率 70 0W、活化时间 3min、水蒸气流量 4.8mL/min。用此工艺条件制得的活性炭碘吸附值 10 31mg/g、亚甲蓝脱色力 10mL/0 .1g、得率 60 .8%。该工艺所需活化时间为传统方法的 1/60 ,得率为传统方法的 2倍左右。     

微波辐射-水蒸气法制备烟杆基颗粒活性炭

研究了以烟杆废弃物为原料,炭化过程中所产生的木焦油为主的复合粘结剂,采用微波辐射-水蒸气法制备颗粒活性炭的可行性。探讨了微波功率、活化时间以及水蒸气质量流量对颗粒活性炭吸附性能和得率的影响。得到了微波辐射-水蒸气法制备颗粒活性炭的最佳工艺:微波功率700 W,活化时间40 m in,水蒸气质量流量1.70 g/m in。此工艺条件制得的颗粒活性炭,碘吸附值1 060.81 mg/g,亚甲基蓝吸附值175 mL/g,得率30.83%。同时,测定了该颗粒活性炭氮吸附,通过BET法计算了活性炭的比表面积,并通过DFT表征了活性炭的孔结构。结果表明:该活性炭为微孔型,BET比表面积为1 109.22 m2/g,总孔容为0.613 1 mL/g。     

水蒸气活化再生乙酸乙烯合成触媒载体活性炭

探讨了活化温度、活化时间、水蒸气流量对再生后活性炭吸附性能和得率的影响,得到了最佳工艺条件:活化温度1 000℃,活化时间60 min,水蒸气流量2.23 g/min。该工艺条件下再生活性炭的碘吸附值1 174.37 mg/g,亚甲基蓝吸附值200 mL/g,得率为62.87%。再生后活性炭的吸附指标达到国家一级品的标准,其中亚甲基蓝吸附值是国家一级品标准的2.22倍。同时,测定了该活性炭氮吸附,通过BET计算了活性炭的比表面积,通过密度函数理论(DFT)表征了活性炭的孔结构。结果表明:该活性炭为微孔型,BET比表面积为1 254.51 m2/g,总孔容为0.592 6 mL/g。     

微波加热烟杆氢氧化钾活化法制备活性炭的研究

研究了微波加热烟杆氢氧化钾活化法制备微孔活性炭的新工艺.采用正交实验研究了相关因素对活性炭得率和吸附性能的影响,确定了最佳工艺条件.该工艺将传统方法的预热、干燥、炭化和活化简化为一个过程,所需要的活化时间是传统方法的1/13,产品的亚甲基蓝吸附值是国家一级标准的2.56倍.同时测定了该活性炭的氮吸附等温线,通过H-K方程和密度函数理论(DFT)表征了活性炭的孔结构.结果表明:该活性炭为微孔型,BET比表面积为1402 m2·g-1,总孔容为0.6855 mL·g-1.采用扫描电镜和透射电镜分析了活性炭的微观结构,与氮吸附测定的结果较为一致.     

焦化除尘粉制备活性炭的研究

研究了以焦化除尘粉为原料,采用水蒸气为活化剂制备活性炭的可行性.利用正交实验探讨了活化温度、活化时间、水蒸气流量等对活性炭吸附性能的影响.结果表明:影响除尘粉基活性炭制备的主次因素为活化温度、活化时间、水蒸气流量;制备除尘粉基活性炭的最佳条件为活化温度850.C,活化时间90 main,水蒸气流量10.73 mL/min,制备除尘粉基活性炭的碘吸附值为490.5215 mg/g,产率为35.16％.     

酚醛树脂基微孔活性炭的制备及表征

以酚醛树脂为原料,氢氧化钾为活化剂,采用炭化活化一步法工艺制备酚醛树脂基活性炭.采用TG-DTA、FTIR、N2-BET等表征手段对炭化活化过程、表面官能团、比表面积和孔结构进行了测试和分析.结果表明:碱脂比为2:1,活化温度为750℃,活化时间为60 min工艺条件下制备的酚醛树脂基活性炭对亚甲基蓝和碘的吸附值分别为186 mL·g-1和1 417.96 mg·g-1;所制备的活性炭以微孔为主,其比表面积为1 667 m2·g-1,孔容1.182 cm3·g-1.平均孔径1.835 nm.     

梧桐树叶基活性炭的制备研究

研究了制备梧桐树叶基活性炭的影响因素。以深秋梧桐树叶为原料,采用微波辐照磷酸活化法制备了梧桐树叶基活性炭,并对影响梧桐树叶基活性炭吸附性能的因素进行了研究。选取微波功率、辐照时间、液固比、活化剂浓度为影响因素,以碘吸附值作为评价指标,通过正交实验确定了梧桐树叶基活性炭的最佳制备条件;分析了各影响因素对梧桐树叶基活性炭性能的影响程度。以碘吸附值作为评价指标,最佳水平组合为微波功率800 W、辐照时间8 min、活化剂浓度80%、液固比为3 mL.g-1,在此条件下制备的梧桐树叶基活性炭碘吸附值大于618.78 mg.g-1。各影响因素对梧桐树叶基活性炭性能的影响程度依次为活化时间>液固比>微波功率>磷酸浓度。     

水蒸气活化法制备稻壳活性炭的研究

研究了水蒸气活化法制备稻壳活性炭的工艺条件,探讨了炭化温度、活化温度、活化时间和水蒸气用量对活化效果的影响。最佳工艺条件为:炭化温度 450℃、活化温度 900℃、活化时间 90 min和水蒸气用量为炭化料的1.5倍,制备的活性炭碘吸附值 844 mg/g,亚甲基蓝吸附值 138 mL/g,产品得率 13.9%。这些指标与木质活性炭相当。且投资少,能耗低,具有良好的经济效益与社会效益。     

微波辐射二氧化碳法制备烟秆基颗粒活性炭

研究了以烟秆废弃物为原料，木焦油为主的复合黏结剂，采用微波辐射二氧化碳法制备颗粒活性炭的可行性．系统探索了微波功率，活化时间以及二氧化碳流量对颗粒活性炭吸附性能和产率的影响，得到了微波辐射二氧化碳法制备颗粒活性炭的最佳工艺条件：微波功率700W，活化时间70min，二氧化碳流量0．15L／min．用此工艺条件制得的颗粒活性炭，碘吸附值为960．30mg／g，亚甲基蓝吸附值13mL／0．1g，产率为43．37％．同时，测定了该颗粒活性炭氮气吸附，通过BET法计算了活性炭的比表面积，并通过DFT表征了活性炭的孔径结果．结果表明，该活性炭为微孔型，BET比表面积为986．65m^2／g，总孔容为0．5152mL／g．     

微波加热化学活化法制备活性炭的优化工艺研究

研究了微波加热条件下碳酸钾活化制备活性炭的工艺流程。以碳酸钾为活化剂,微波为热源,采用正交试验,研究了浸渍时间、活化剂浓度、微波功率、微波加热时间对活性炭产品性能碘吸附值、亚甲基蓝吸附值、得率的影响规律,得到了最佳工艺条件,即微波功率600 W、微波加热时间6 min、碳酸钾浓度0.20 g/mL、浸渍时间24 h。制得活性炭的碘吸附值可达1189.68 mg/g、亚甲基蓝吸附值190 mL/g、得率29.48%,在该工艺条件下,制备的活性炭试样比表面积为1186.10 m²/g,总孔容积0.624 cm³/g,微孔容积0.407 cm³/g,吸附性能较国家标准有所提高。     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。     

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.     

基于ATRP法制备的触角状亲水性羟胺树脂的吸硼性能的研究

以大分子引发剂氯乙酰化聚苯乙烯微球(PS-acyl-Cl)经原子转移自由基聚合(ATRP)法引发丙烯酰胺(AM)和甲基丙烯酸缩水甘油酯(GMA)单体的共聚接枝,制得一种触角状亲水性环氧载体(PS-acyl-g-P(AM-co-GMA)),再经二乙醇胺(DEA)的环氧基开环胺化反应,得到一种含多个-NCH2CH2OH螯合配基的多齿-五元螯合环的触角状亲水性羟胺树脂(PS-acyl-g-P(AM-co-GMA)-DEA)。将此树脂用于硼吸附研究,结果表明,PS-acyl-g-P(AM-co-GMA)-DEA树脂对硼的吸附满足Langmuir方程,为单分子层吸附;饱和吸附量约为37.7 mg·g-1,且树脂5 min即可达到吸附平衡,与其它已报道的吸硼树脂相比,该树脂具有更高的吸附量和吸硼速率。吸附动力学研究表明,树脂吸附硼的过程主要由颗粒扩散过程控制。重复使用5次后该树脂的吸附量基本不变,解吸率均在90%以上,重复使用性能良好。