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671.
掺杂La3+纳米ZnO的制备及其光催化性能 总被引:5,自引:3,他引:2
采用共沉淀法制备了不同La3+含量的La3+-ZnO催化剂,采用x射线衍射仪、透射电子显微镜等对催化剂的结构、相组成、形貌和粒径进行了表征,比较了不同La3+含量的La3+-ZnO催化剂对罗丹明B降解率的影响。实验结果表明,掺杂La3+导致ZnO粒径减小,比表面积增大,延长了光生电子-空穴对的寿命,提高了ZnO的光量子产率,La3+-ZnO催化剂的光催化活性比ZnO显著增强。La3+质量分数为0.8%时,罗丹明B降解率最高,为92.5%。经La3+质量分数0.8%的La3+-ZnO催化剂降解后罗丹明B已被完全降解为无机小分子。 相似文献
672.
Wenyong Wu Shiyang Yin Honglu Liu Yong Niu Zhe Bao 《Environmental monitoring and assessment》2014,186(10):6747-6756
The purpose of this study was to determine and evaluate the spatial changes in soil salinity by using geostatistical methods. The study focused on the suburb area of Beijing, where urban development led to water shortage and accelerated wastewater reuse to farm irrigation for more than 30 years. The data were then processed by GIS using three different interpolation techniques of ordinary kriging (OK), disjunctive kriging (DK), and universal kriging (UK). The normality test and overall trend analysis were applied for each interpolation technique to select the best fitted model for soil parameters. Results showed that OK was suitable for soil sodium adsorption ratio (SAR) and Na+ interpolation; UK was suitable for soil Cl? and pH; DK was suitable for soil Ca2+. The nugget-to-sill ratio was applied to evaluate the effects of structural and stochastic factors. The maps showed that the areas of non-saline soil and slight salinity soil accounted for 6.39 and 93.61 %, respectively. The spatial distribution and accumulation of soil salt were significantly affected by the irrigation probabilities and drainage situation under long-term wastewater irrigation. 相似文献
673.
674.
With increasing attention paid to the recycling use of aged refuse as vegetated soil, it is important to check its possible polluting risk and probe the tolerance of plant system to its stress. For this reason, several physiological responses in Zea mays L. (maize) to the leaching samples of aged refuse in different particle-size (900-300, 300-150, 150-105, 105-90, and 90-0 microm) were investigated in the present study, including growth, lipid peroxidation, protein oxidation and activities of antioxidant enzymes. The results indicate that the aged refuse affected the growth of maize seedlings, and elevated the levels of lipid peroxidation and protein oxidation in leaf tissues in a time-dependent manner, accompanying by the changes of antioxidant status. Also, above physiological responses varied as a function of particle-size distribution of the aged refuse, and statistical growth inhibition and oxidative stress occurred after the exposure of smaller particle-size samples, which contained higher level trace metals, the characteristic pollutants in the aged refuse. The results implicate that aged refuse might cause environmental stress on plant system, but the polluting risk mainly resulted from smaller particle-size samples. Therefore, the critical point of utilizing aged refuse as vegetated soil focused on analyzing its particle-size distribution, and screening out appropriate particle-size samples. 相似文献
675.
Release of polycyclic aromatic hydrocarbons from Yangtze River sediment cores during periods of simulated resuspension 总被引:5,自引:0,他引:5
The role of resuspension duration on release of 16 PAHs was measured experimentally using a particle entrainment simulator (PES). Three sediment cores were resuspended for 12h at 0.2 and 0.5N m(-2). PAHs in water column and total suspended solids (TSS) were monitored at intervals. After 0.25h of resuspension, PAH release was on average 42% of their concentrations after 12h of resuspension, indicating fast release of PAHs from sediments in an initial short time. Moreover, PAHs released faster at 0.5N m(-2) than at 0.2N m(-2); low molecular weight PAHs (2-3-ring) released faster than median molecular weight (4-ring) PAHs. PAH concentrations in TSS showed generally increase with time and differences in magnitudes based on sediment type and energy. Overall, the composition of sediments is the major factor in determining the amount of released PAHs, more so than the level of resuspension energy applied. 相似文献
676.
Tan Feifei Yang Longxue Lu Zhaohua Niu Zhiyuan 《Environmental science and pollution research international》2022,29(49):73878-73895
Environmental Science and Pollution Research - Understanding whether and how urban innovation offers a sound solution to the dilemma of urban green development is a crucial response to mitigate the... 相似文献
677.
Jia Shuopeng She Weibin Pi Zhipeng Niu Buying Zhang Jinhua Lin Xihan Xu Mingjun She Weiya Liao Jun 《Environmental science and pollution research international》2022,29(7):9944-9956
Environmental Science and Pollution Research - Meteorological factors, which are periodic and regular in a long run, have an unignorable impact on human health. Accurate health risk prediction... 相似文献
678.
Xiang Zhang Yue Xuan Bin Wang Chuan Gao Shengli Niu Gaiju Zhao Dong Wang Junhua Li Chunmei Lu John C. Crittenden 《Frontiers of Environmental Science & Engineering》2022,16(7):88
679.
Jiao Wei Niu Yong Zhou Junyu Zhang Hanyu Song Hongli Li Kai 《Environmental science and pollution research international》2022,29(12):17062-17071
Environmental Science and Pollution Research - The bioavailable trace metals are closely related to environmental safety and human health, which might have different source characteristics from the... 相似文献
680.
为了检验新型多功能救援属具在结构设计、制作工艺、功能组合等方面在实际复杂灾害救援场景下的应用实效,采用改进的AHP、熵权法和模糊综合评价方法从工作能力、工作效率、协作能力、维护能力等四个方面对2种新研发的多功能救援属具进行了应用效能综合评价的研究,构建了具有针对性及科学合理的评价指标体系,制定指标测试方法。结果表明:利用改进AHP、熵权法、模糊综合评价相结合的方法能够进一步减少人为主观因素的影响,提升评估结果的实用性和有效性;多功能救援属具提升了实际救援行动的工作能力和工作效率,应用效能评价结果同专家经验判断基本一致。 相似文献