为实现水环境中抗生素和重金属的高效去除,采用水热法构筑了一种集高效吸附性、可见光催化性以及磁回收性于一体的磁性生物炭基钨酸铋光催化剂(BC@ZFO/BWO).实验结果表明,磁性生物炭(BC@ZFO)掺杂量的质量分数为25％时,BC@ZFO/BWO的吸附性能和光催化活性最佳,在120 min内,对20.00 mg/L四环素(TC)吸附率为58.38％;在光反应60 min内,对20.00mg/LTC和Cr(Ⅵ)去除率分别为95.36％和98.04％.ESR测试结果表明,在光催化反应过程中·O2-和·OH发挥了主要作用.重复利用实验表明,质量分数为25％的(BC@ZFO)/BWO具有良好的稳定性与磁回收性.可见,相比于传统的钨酸铋光催化剂,BC@ZFO/BWO光催化复合材料的构建,提升了光催化剂对水中有机污染物和重金属的氧化还原能力,为水污染修复和粉末催化剂的回收提供了新思路.

CO2加氢制甲醇技术是利用CO2和氢气直接催化合成甲醇,利用碳循环减少CO2排放的同时生成可利用化学能源,为减轻温室效应提供了高效的绿色科学技术.通过Citespace软件对CO2加氢制甲醇技术进行科学计量可视化分析,可以更快地把握此领域的研究热点以及未来的创新方向.

CO2地质封存技术是目前被认为有效减少温室气体排放量及应对气候变暖最有效、最直接的技术,而深部咸水层是CO2地质储存的理想储层.CO2注入咸水层后对土著微生物群落结构与多样性会产生较大影响,而某些特定微生物会反作用于CO2地质封存过程,从而起到积极作用.

Based on the hydrogeological characteristics of field site contaminated by the petroleum in the Northeast of China,the effects of environmental factors on the growth of microorganisms and the biodegradation of benzene and xylene are investigated by batch experiment.Also,the migration rules for microorganisms in different sandy media and the biodegradation of benzene and xylene using biosparging are carried out by column experiment.The results indicate that the optimal condition for the biodegradation of benzene and xylene is as follows:the temperature is 20℃,pH value is 7.0,nitrogen and phosphorus added and DO is 5.21mg/L.The migration velocity of microorganisms increases with the diameter and porosity of the media increasing.For one kind of medium,the time for microorganism penetrating first medium of 20cm is longer than last medium of 20cm.For different media,the time taken by microorganisms to penetrate the medium of 40cm is in an ascendant order,namely,gravelly sand<coarse sand<medium sand.Generally speaking,with the diameter of the media decreasing,the removal rate of benzene and xylene increases and in the medium of medium sandy,the removal rate reaches at above 40% by biosparging.

Some poisonous gases,like H2 S,benzene and toluene,will be produced in the process of in situ shale-oil extraction.These gases may leak out through the flange interface,the pipeline breakage,the geological crack and the outer side of an abandoned well.In this study,the risk of the air environment is assessed and evaluated in the in-situ shale-oil extraction in a country of Jilin Province,China.The most credible accident consequences are calculated at the same time.It is shown that,after leakage from the flange interface or the pipeline or after rupture,H2 S tends exceed the maximum allowable concentration in the workshop in the plant area.The concentration values of H2 S,benzene and toluene exceed the occupation contact limiting values when the wind speed is 2m/s.The concentrations of H2 S and benzene exceed the value of the immediate danger to life and the health concentration limitation.Toluene value is within the standard.H2 S concentrations exceed the limit value of acute poisoning phenomenon,while those of benzene and toluene are within the standard.The plant area is mainly affected during the short time of the leakage accident occurring.According to the risk calculation and evaluation in this study,the project risk level is lower than the same industry standard.The environmental risk is acceptable.In order to minimize the probability of the accident risk and the impact on the surrounding environment,we put forward some prevention and management suggestions.

<正>"红色经典"影片一直是中国影视的主体,在经历过一段低潮之后,通过大量的重拍和热播再次成为新世纪中国影视的主旋律创作,特别是2009年国庆六十周年前后,作为中国社会惯有的"回顾"和"献礼"形式,此类影片更呈现出一个令人瞩目的高潮。有《建国大