纳米TiO_2-Al_2O_3负载CuMnO_x对甲苯的催化燃烧

研究采用改进的溶胶-凝胶法制备了TiO2-Al2O3复合载体,并用浸渍法制备CuMnOX/TiO2-Al2O3催化剂,通过对甲苯废气催化燃烧的实验,分别考察了Cu-Mn负载量、Cu/Mn摩尔比、焙烧温度及载体对催化剂制备过程及催化剂活性的影响。实验结果表明:活性组分负载量25%,铜锰活性组分的配比Cu:Mn=1:2,焙烧温度500℃是浸渍法制备CuMnOX/TiO2-Al2O3催化剂较佳的工艺条件;XRD衍射图谱表明,500℃下铜锰尖晶石的存在是催化剂催化活性优良的主要原因;由复合载体制备的CuMnOX/TiO2-Al2O3催化剂比单一载体制备的CuMnOX/Al2O3催化剂具有更高的甲苯转化率,其T99比单一载体要低20℃以上。     

Photocatalytic degradation of methyl orange over ITO/CdS/ZnO interface composite films

ITO/CdS/ZnO interface composite films were successfully prepared by subsequent electrodeposition of CdS and ZnO onto indium tin oxide (ITO) glass substrates. The obtained ITO/CdS/ZnO composite films were characterized with X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis spectroscopy. The photocatalytic activity of ITO/CdS/ZnO composite films were investigated using methyl orange (MO) as a model organic compound under UV light irradiation. The influence of operating parameters on MO degradation including initial concentration of MO, pH value of solution, and inorganic anion species over the composite films were examined. A blue shift of absorption threshold was observed for the ITO/CdS/ZnO film in comparison with ITO/ZnO film. ITO/CdS/ZnO composite films prepared under specific conditions showed a higher photocatalytic activity than that of ITO/ZnO films. It was also found that the photocatalytic degradation of MO on the composite filing followed pseudo-first order kinetics.     

废旧线路板非金属材料综合利用

随着信息时代的到来,废印刷线路板处理技术日益成熟,大量的废线路板非金属粉亟需处理。从环境保护和资源回收的角度,综述了废印刷线路板非金属粉的资源化利用。     

基于响应面优化条件下柚皮对Pb2+的吸附

采用Plackett-Burman(P-B)法和中心复合设计(Central Composite Design,简称CCD)对影响柚皮吸附Pb2+的6个条件进行筛选优化.P-B实验设计与统计学分析表明:pH值、Pb2+初始浓度、吸附剂用量是影响吸附率的3个关键因素.以吸附率为响应目标,对3因素进行中心复合设计,并经响应面法优化分析得到影响吸附率的二阶模型,确定了Pb2+吸附实验的最优操作条件:pH值5.4.Pb2+初始浓度为265.86mg·L-1,吸附剂用量为2.56 g·L-1,实测吸附率达到92.47%,吸附量为96.01 mg·g-1;整个吸附过程吸附剂柚皮没有经过任何化学预处理.效果优于一般的天然吸附剂.研究结果表明,柚皮是一种很具潜力的环保型廉价吸附剂.     

毛竹遗态 Fe2O3／Fe3O4／C 复合材料对水中锑（III）的吸附研究

以毛竹遗态Fe2 O3／Fe3 O4／C复合材料为吸附剂,锑（III ）初始含量、溶液初始pH值、吸附剂投加量以及吸附剂粒径为影响因素开展吸附影响研究。结果表明,随着锑（III ）初始浓度的升高,毛竹遗态Fe2 O3／Fe3 O4／C复合材料对锑（III ）的吸附量逐渐增加;初始溶液pH为7时,对锑（III ）的吸附效果最好,吸附量为4．7821 mg／g;块状吸附剂对水中锑（III ）的去除率和吸附量与粉末状吸附剂吸附效果相当。     

Assumptions beyond the science: encouraging cautious conclusions about functional magnetic resonance imaging research on organizational behavior

Functional magnetic resonance imaging (fMRI) is likely to become the major tool for studying the neural underpinnings of organizational behavior. It is a technique for brain imaging that, according to advocates, provides information about which areas of the brain are activated during organizational processes (e.g., leadership and decision‐making). In this article, we take a critical look at this tool from a technical perspective. In particular, we take the reader through the assumptions that must be made at the three main steps of the research process (study design, data capture, and interpretation of results) in order to draw conclusions about organizational phenomena from fMRI research. Applying this analysis to three case studies demonstrates the gap between what fMRI can actually tell us and the claims often made about the contribution of fMRI to understanding and improving organizational behavior. Our discussion provides researchers with a series of recommendations oriented toward optimizing the use of fMRI to help it live up to its potential in the field of organizational behavior and consumers with a means of evaluating fMRI research in order to draw appropriate and warranted conclusions. Copyright © 2016 John Wiley & Sons, Ltd.     

硫酸/硫酸钠复合淋洗剂对铬渣的淋洗效果研究

以湖南长沙某铬盐厂铬渣为研究对象,通过室内模拟实验,采用振荡淋洗方法研究了硫酸-硫酸钠复合淋洗剂对铬渣污染场地Cr的淋洗效果,探讨了淋洗剂浓度、液固比和淋洗时间等对淋洗效果的影响,以及淋洗前后重金属形态的变化,并通过对比试验研究了硫酸钠、柠檬酸、草酸、Na2-EDTA、硫酸、柠檬酸-柠檬酸三钠以及盐酸-氯化钠作为淋洗剂对总铬和六价铬的淋洗效果。结果表明:硫酸/硫酸钠复合淋洗剂在浓度为0.4 mol/L,液固比为20∶1,反应时间为6 h,常温条件下可以达到最佳淋洗效果,总铬和六价铬的浸出效率分别为70.35%和71.56%;另外,重金属形态分析表明,该复合淋洗剂有效减少了铬渣中弱酸可提取态和有机物结合态Cr的百分比,使得残渣态Cr的百分比增加,从而降低了Cr的活性,达到修复目的。淋洗剂对比试验结果表明,与其他淋洗剂相比,硫酸-硫酸钠淋洗效果最好,其中的氢离子能与Cr~(3+)进行离子交换,而硫酸根能够有效地将钙与六价铬分离,对此高钙铬渣的处理更具针对性和有效性。     

Bi2O3-TiO2复合光催化剂协同处理铬-邻苯二甲酸酯复合污染

以硝酸铋和钛酸丁酯为前驱体,采用水热法制备了Bi_2O_3-TiO_2复合半导体材料,并利用X射线衍射(XRD)、紫外-可见吸收光谱(UVVis)、能谱分析(EDS)、X射线光电子能谱(XPS)等手段对复合材料的结构进行了表征.同时,考察了Bi_2O_3-TiO_2复合材料对重金属Cr(Ⅵ)和难降解邻苯二甲酸二丁酯(DBP)复合污染的处理性能,并探讨了复合催化剂协同处理复合污染的作用机制.结果表明:该复合催化剂在可见光下能同时降低重金属Cr(Ⅵ)和有机物DBP的浓度,抑制电子和空穴复合,表现出比对单一Cr(Ⅵ)及DBP污染物更高的处理效率.当Bi_2O_3含量为4%时,复合催化剂表现出最佳的光催化活性.     

减振降噪功能材料的研制

根据材料性能的要求,选择环氧树脂为粘合剂,低分子聚酰胺为固化剂,石粉,石英砂,玻璃纤维３种物质为填料,根据优化的配方制成一种高分子复合材料,该材料的硬度约为２４０ＨＢ左右,冲击强度约为３０ｋｇ·ｃｍ／ｃｍ＾２,均接近于某些金属材料的指标,易成型,并且成本较低,可以用来代替纺织厂有梭织机的某些受撞击比较严重的金属部件,具有广泛的应用价值。