Ab Initio Study of the Interaction of a Graphene Surface Decorated with a Metal-Doped C30 with Carbon Monoxide,Carbon Dioxide,Methane, and Ozone

Using DFT simulations, we studied the interaction of a semifullerene C₃₀ and a defected graphene layer. We obtained the C₃₀ chemisorbs on the surface. We also found the adsorbed C₃₀ chemisorbs, Li, Ti, or Pt, on its concave part. Thus, the resulting system (C₃₀-graphene) is a graphene layer decorated with a metal-doped C₃₀. The adsorption of the molecules depends on the shape of the base of the semifullerene and the dopant metal. The CO molecule adsorbed without dissociation in all cases. When the bottom is a pentagon, the adsorption occurs only with Ti as the dopant. It also adsorbs for a hexagon as the bottom with Pt as the dopant. The carbon dioxide molecule adsorbs in the two cases of base shape but only when lithium is the dopant. The adsorption occurs without dissociation. The ozone molecule adsorbs on both surfaces. When Ti or Pt are dopants, we found that the O₃ molecule always dissociates into an oxygen molecule and an oxygen atom. When Li is the dopant, the O₃ molecule adsorbs without dissociation. Methane did not adsorb in any case. Calculating the recovery time at 300 K, we found that the system may be a sensor in several instances.     

矿泉水中臭氧杀灭霉菌效果研究

采用从生产现场及矿泉水瓶和盖分离出的卵形孢霉 (Oosporasp .)、刀孢霉 (Clas terosporiumsp .)、青霉 (Penicilliumsp .)、结实串孢霉 (Hormisciumsp .)、峡筒串孢霉 (Pro phytromasp .)和南方常见污染霉菌中的黑曲霉 (Aspergillusniger)MIG3.2 7、米曲霉 (As pergillusoryzae)MIG3.2 9、桔青霉 (Penicilliumcitrinum )MIG3.1 0 0、绳状青霉 (Penicilliumfuniculosum)MIG3.1 0 4、拟康氏木霉 (Trichodermapseadokoningi)MIG3.1 42等标准菌株作为试验菌株 ,分别用PET瓶灌装臭氧质量浓度为 0 1、0 3和 0 6mg/L的矿泉水后 ,在矿泉水瓶和瓶盖中分别添加 0～ 30个霉菌孢子 ,当矿泉水中臭氧质量浓度达到 0 3mg/L以上时 ,对霉菌孢子有较好的杀灭效果 ,平均存活阳性率 <1 0 %。在 1年保质期内 ,霉菌存活阳性率在不同存放时间差异不大。     

In vivo toxicity assessment of deoxynivalenol-contaminated wheat after ozone degradation

ABSTRACT

The effect of ozone on deoxynivalenol (DON) detoxification was investigated. Ozone treatment could significantly reduce the levels of DON in wheat; 53% of DON in wheat was decomposed with 90 mg l^–1 of ozone at a flow rate of 15 l min^–1 for 4 h. The safety of DON-contaminated wheats (DCWs) untreated/treated by ozone was also evaluated. Institute of Cancer Research (ICR) mice were divided into a standard diet group and five experimental diet groups for a 51-day orally administration experiment. In the experiment, no remarkable changes in the general appearance of the mice were observed, and all the mice survived until the scheduled necropsy. The results of sub-chronic toxicity indicated that mice fed on DCWs alone had significantly decreased in body weight gain, thymus and spleen weights, ratios of liver, thymus and spleen to body weight, blood indices (red blood cell, haemoglobin, white blood cell), and pro-inflammatory cytokines (interleukin-6 (IL-6), tumour necrosis factor alpha (TNF-α)), while showing a significant increase in alanine aminotransferase, aspartate aminotransferase, blood creatinine and blood urea nitrogen levels. Histopathological examination indicate that DON elicited some degree of toxicity on the liver, kidney and thymus tissue. Mice fed on DCWs treated by ozone mitigated the adverse effects compared with mice fed on DCWs. All the results suggested that the deleterious effects of DON could be highly reduced by ozone, and ozone itself shows minor toxic effects on animals in this process.     

Ozone and Chlorine Treatment of Minimally Processed Lettuce

ABSTRACT The objectives of this research were to determine the effectiveness of ozone in combination with chlorine on the microbiological and sensory attributes of lettuce as well as the quality of the water used for processing commercial lettuce salad. Iceberg lettuce was inoculated with 8.0 log CFU/g microorganisms isolated from spoiling lettuce, treated with combinations of chlorine and ozone, and analyzed microbiologically. Commercial salads rinsed with chlorine, ozone, or a mixture were evaluated for sensory acceptability. Chlorine, ozone, and chlorine-ozone reduced aerobic plate count up to 1.4, 1.1, and 2.5 log, respectively. As determined by appearance, commercial lettuce salads treated with chlorine, ozone, or a combination had a shelf life of 16, 20, or 25 d, respectively. Using an ozone-chlorine or ozone rinse for commercial lettuce salads, there were no visible turbidity changes in process water. The quality of the water remained constant for longer periods of time making it available for longer reuse. Therefore, chlorine-ozone combinations may have beneficial effects on the shelf life and quality of lettuce salads as well as on the water used for rinsing or cleaning the lettuce.     

包装方式对冰温保鲜脆肉鲩鱼片品质的影响

将生鲜脆肉鲩鱼片分别用臭氧充气、CO2充气和真空3种方式包装,于冰温(-0.5℃)下保藏,研究包装方式对脆肉鲩鱼片品质的影响。结果表明,随储藏时间延长,菌落总数、挥发性盐基氮(TVB-N)、硫代巴比妥酸(TBA),肉质渗出率随贮藏时间的延长而增大。包装方式对鱼肉菌落总数、TVB-N、TBA和肉汁渗出率的影响有显著差异。臭氧充气包装和CO2充气包装效果优于真空包装,臭氧充气包装鱼片,品质好于其他两种包装方式。     

流化催化裂化汽油吸附法深度脱硫工艺的研究

以臭氧氧化活性炭为吸附剂,对流化催化裂化(FCC)汽油进行吸附脱硫研究,探索了最佳吸附条件和最佳再生条件。实验结果表明,在活性炭颗粒大小为80～100目、吸附温度为80℃、原料液态空速为1.70h-1的最佳吸附条件下,可使初始硫含量为796μg/g的FCC汽油的初始流出液的硫含量降到18μg/g,初始脱硫率达97.7%;在脱附剂为乙醇、再生温度为60℃、脱附剂液态空速为1.70h-1的最佳再生条件下再生活性炭,循环使用3次时仍可使初始流出液的硫含量降到45μg/g,初始脱硫率达94.3%。     

紫外臭氧垂直探测仪波长定标研究(英文)

介绍了一种新的紫外臭氧垂直探测仪波长定标方法。结合连续光谱和单色仪产生特征谱线克服了一些特殊波段内离散线谱的缺失。紫外臭氧垂直探测仪的波长定标系统主要由高稳定氙灯光源、1.5 m车尔尼-特纳型单色仪以及前置、后置光学系统构成。该新方法的基本原理主要是一个相互定标校准的过程。紫外臭氧垂直探测仪自带汞灯在紫外波段给波长定标系统提供参考标准光谱,波长定标系统则反过来给紫外臭氧垂直探测仪提供12个更高线性精度的臭氧吸收特征光谱。该波长定标结果完全满足臭氧反演所需要的波长准确度及光谱带宽精度要求。     

聚丙烯微孔膜表面的臭氧处理接枝改性

采用臭氧处理聚丙烯微孔膜,在其表面引入过氧化物,然后通过过氧化物的分解引发丙烯酸单体在微孔膜表面接枝。研究了臭氧处理条件、接枝反应条件对聚丙烯微孔膜的接枝率、亲水性及溶胀性的影响。研究结果表明,丙烯酸接枝微孔膜与水的接触角随接枝率的增加而逐渐下降,吸水率随接枝率的增加而呈线性增加趋势,表现出良好的亲水性与溶胀性。     

杭州主城区饮用水深度处理的发展与实践

经过数十年的实践,有必要对我国饮用水深度处理技术的发展进行回顾和总结。文中以杭州主城区为例,总结认为新建水厂需考虑改扩建的需求,活性炭层下设砂垫层能有效降低活性炭出水的浑浊度,前置活性炭工艺需充分考虑活性炭的强度,避免光照能有效降低砂滤池藻类繁殖的风险。同时,对改造中采用臭氧活性炭及膜处理两种典型的深度处理组合工艺的主要设计参数及出水水质进行了对比分析。结果表明,上述两种深度处理组合工艺在水质上的差异主要是浑浊度和微生物。     

蔗渣氧碱浆的臭氧漂白研究

本研究对清洁的臭氧以及过氧化氢氧系漂白工艺的蔗渣氧碱浆漂白效果进行了探索与优化.结果表明,在浆浓40％、臭氧浓度为0.9 kg/(min·t)(以绝干浆计)、常温漂白10 min、复合酸用量1.5％、pH值2.5的条件下,可获得理想的臭氧漂白蔗渣氧碱浆.该浆在氧碱浆基础上,白度从58.6％提高到74.5％,增加15.9...