全文获取类型
收费全文 | 44篇 |
免费 | 6篇 |
国内免费 | 29篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 3篇 |
环保管理 | 2篇 |
综合类 | 39篇 |
基础理论 | 17篇 |
污染及防治 | 12篇 |
评价与监测 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 4篇 |
2015年 | 9篇 |
2014年 | 1篇 |
2013年 | 7篇 |
2012年 | 5篇 |
2011年 | 5篇 |
2010年 | 6篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 5篇 |
2006年 | 1篇 |
2005年 | 1篇 |
2003年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 2篇 |
排序方式: 共有79条查询结果,搜索用时 15 毫秒
21.
22.
In this study, a photocatalytic material consisting of ZnO and yttrium-doped ZnO (YZO) nanoparticles was obtained via a facile precipitation conducted under ambient pressure whereby crystalline ZnO was successfully doped with yttrium. YZO had a hexagonal wurtzite polycrystalline structure with smaller crystal and grain sizes than ZnO, which in turn meant larger specific surface area and pore volume. Chemical defects were also produced, which facilitated photocatalytic activity, because such defects can act as reaction centers. The optical band gap magnitude and the diamagnetic nature of YZO were also determined. The structural, crystalline, and chemical defects of YZO synergistically enhanced the photocatalytic degradation of carbaryl; indeed, the kinetic rate constant of this reaction catalyzed by YZO was 11.17 × 10−2 min−1 under natural sunlight irradiation, higher than the value measured for ZnO (8.68 × 10−2 min−1). Evidence thus indicates that yttrium-doping effectively modified some properties of ZnO nanoparticles so that YZO nanoparticles proved a suitable photocatalytic material for carbaryl degradation. 相似文献
23.
TiO2/ZnO光催化降解四环素的研究 总被引:11,自引:0,他引:11
以太阳光、汞灯为光源,TiO2/ZnO复合半导体为催化剂处理四环素溶液,探讨了催化剂的配比、溶液体积、光照时间、pH、初始浓度、光强等6种因素对光催化活性的影响,比较了汞灯和太阳光作光源时的光催化效果,结果表明,用太阳光作光源时光催化效果也较好。 相似文献
24.
25.
Wang Zheng Zhang Bingru Li Fengting 《Frontiers of Environmental Science & Engineering in China》2007,1(4):454-458
The objective of this study was to prepare a new photocatalyst with high activities for degradation of organic pollutants.
Coupled ZrO2/ZnO photocatalyst was prepared with a simple precipitation method with cheap raw materials zinc acetate and zirconium oxychloride,
and was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Reactive brilliant red X-3B was
used as a model compound to investigate the photocatalytic activity of synthesized catalysts in water under 254 nm UV irradiation.
Results show that the optimal calcination temperature and coupling molar ratio of Zr were 350°C And 2.5%, respectively. At
the calcination temperature of 350°C, ZrO2 was dispersed on the surface of hexagonal ZnO in the form of amorphous clusters. The particle size of ZrO2/ZnO decreased with the decrease of calcination temperature and the increase of Zr coupling amount. ZrO2/ZnO has better photocatalytic activity for degradation of reactive brilliant red (RBR) X-3B than pure ZnO and P25-TiO2. 相似文献
26.
The effects of biosolids,ZnO,and ZnO/biosolids on soil microorganism and the environmental fate of coexisting racemic–quizalofop–ethyl(rac-QE) were investigated.Microbial biomass carbon in native soil,soil/biosolids decreased by 62% and 52% in the presence of ZnO(2‰,weight ratio).The soil bacterial community structure differed significantly among native soil,soil/biosolids,soil/ZnO,and soil/biosolids/ZnO based on a principal co-ordinate analysis(PCo A) of OTUs and one-way ANOVA test of bacterial genera.Chemical transformation caused by ZnO only contributed 4% and 3% of the overall transformation of R-quizalofop-ethyl(R-QE) and S-quizalofop-ethyl(S-QE) in soil/ZnO.The inhibition effect of ZnO on the initial transformation rate of R-QE(rR-QE) and S-QE(rR-QE) in soil only observed when enantiomer concentration was larger than 10 mg/kg.Biosolids embedded with ZnO(biosolids/ZnO) caused a 17%–42% and 22%–38% decrease of rR-QEand rS-QE,although rR-QEand rS-QEincreased by 0%–17% and 22%–58% by the addition of biosolids.The results also demonstrated that the effects of biosolids on agricultural soil microorganism and enantioselective transformation of chiral pesticide was altered by the embedded nanoparticles. 相似文献
27.
28.
Pure and Mg-doped self-assembled ZnO nano-particles for the enhanced photocatalytic degradation of 4-chlorophenol 总被引:1,自引:0,他引:1
N. Clament Sagaya Selvam S. Narayanan L. John Kennedy J. Judith Vijaya 《环境科学学报(英文版)》2013,25(10):2157-2167
A novel self-assembled pure and Mg doped ZnO nano-particles (NPs) were successfully synthesized by a simple low temperature co-precipitation method. The prepared photocatalysts were characterized by X-ray diffraction, high resolution scanning electron mi- croscopy, high resolution transmission electron microscopy, diffuse reflectance spectroscopy and photoluminescence (PL) spectroscopy. The results indicated that the prepared photocatalysts showed high crystallinity with a uniform size distribution of the NPs. The degradation of cholorphenols is highly mandatory in today's scenario as they are affecting the environment adversely. Thus, the photocatalytic degradation of 4-chlorophenol (4-CP), a potent endocrine disrupting chemical in aqueous medium was investigated by both pure and Mg-doped ZnO NPs under UV-light irradiation in the present study. The influence of the Mg content on the structure, morphology, PL character and photocatalytic activity of ZnO NPs were investigated systematically. Furthermore,the effect of different parameters such as 4-CP concentration, photocatalyst amount, pH and UV-light wavelength on the resulting photocatalytic activity was investigated. 相似文献
29.
Ma H Kabengi NJ Bertsch PM Unrine JM Glenn TC Williams PL 《Environmental pollution (Barking, Essex : 1987)》2011,159(6):1473-1480
The present study evaluated phototoxicity of nanoparticulate ZnO and bulk-ZnO under natural sunlight (NSL) versus ambient artificial laboratory light (AALL) illumination to a free-living nematode Caenorhabditis elegans. Phototoxicity of nano-ZnO and bulk-ZnO was largely dependent on illumination method as 2-h exposure under NSL caused significantly greater mortality in C. elegans than under AALL. This phototoxicity was closely related to photocatalytic reactive oxygen species (ROS) generation by the ZnO particles as indicated by concomitant methylene blue photodegradation. Both materials caused mortality in C. elegans under AALL during 24-h exposure although neither degraded methylene blue, suggesting mechanisms of toxicity other than photocatalytic ROS generation were involved. Particle dissolution of ZnO did not appear to play an important role in the toxicity observed in this study. Nano-ZnO showed greater phototoxicity than bulk-ZnO despite their similar size of aggregates, suggesting primary particle size is more important than aggregate size in determining phototoxicity. 相似文献
30.
The photodegradation of the aryloxyphenoxy propionic herbicide cyhalofop-butyl (2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]butylpropanoate (CyB), and of its primary metabolite (2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy]propanoic acid (CyA) was studied in water at different irradiation wavelengths. The sunlight irradiation was investigated also in the presence of humic acid (HA), Fe oxide, titanium dioxide (TiO2) and zinc oxide (ZnO) as photocatalysts.CyB and CyA were rapidly degraded by UV irradiation. CyB afforded the butyl ester of 2-[3-(4-cyano-2-fluorophenyl)-4-hydroxy-phenoxy]propanoic acid (CyI), a metabolite arising from a photo-Fries rearrangement. Instead, CyA yielded (R)-2-4-(4-carboxyl-2-fluorophenoxy)phenoxypropanoic acid (CyD), a dicarboxylic acid arising from the photo-hydrolysis of cyano group via amide. CyB was stable in simulated sunlight also in the presence of the catalysts tested.The irradiation of a CyA solution, in the presence of HA or Fe oxide, with simulated sunlight did not produce any significant degradation. In the same experimental conditions, CyA was totally mineralized in the presence of TiO2 and ZnO. 相似文献