全文获取类型
收费全文 | 618篇 |
免费 | 28篇 |
国内免费 | 245篇 |
专业分类
安全科学 | 41篇 |
废物处理 | 38篇 |
环保管理 | 59篇 |
综合类 | 354篇 |
基础理论 | 125篇 |
污染及防治 | 197篇 |
评价与监测 | 16篇 |
社会与环境 | 38篇 |
灾害及防治 | 23篇 |
出版年
2024年 | 1篇 |
2023年 | 15篇 |
2022年 | 25篇 |
2021年 | 29篇 |
2020年 | 22篇 |
2019年 | 32篇 |
2018年 | 24篇 |
2017年 | 27篇 |
2016年 | 28篇 |
2015年 | 31篇 |
2014年 | 49篇 |
2013年 | 50篇 |
2012年 | 51篇 |
2011年 | 54篇 |
2010年 | 45篇 |
2009年 | 44篇 |
2008年 | 58篇 |
2007年 | 41篇 |
2006年 | 26篇 |
2005年 | 27篇 |
2004年 | 22篇 |
2003年 | 15篇 |
2002年 | 23篇 |
2001年 | 15篇 |
2000年 | 8篇 |
1999年 | 18篇 |
1998年 | 20篇 |
1997年 | 31篇 |
1996年 | 11篇 |
1995年 | 5篇 |
1994年 | 9篇 |
1993年 | 11篇 |
1992年 | 6篇 |
1991年 | 6篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 2篇 |
1981年 | 2篇 |
排序方式: 共有891条查询结果,搜索用时 359 毫秒
531.
Effects of feed solutions on refuse hydrolysis and landfill leachate characteristics 总被引:9,自引:0,他引:9
Tap water, aerobically pre-treated leachate, and anaerobically pre-treated leachate, were each fed into the top of a series of three simulated landfills columns, filled with municipal solid waste collected in Shanghai, China. Changes in leachate, including pH, total organic carbon (TOC), and volatile fatty acids (VFAs), and the produced biogas were monitored over time. The tap-water-fed columns had a low hydrolysis rate that yielded an acidic environment (pH 4.8-5.4) in the leachate that inhibited methanogenesis reaction in the refuse. When aerobically pre-treated leachate was fed into the columns, the hydrolysis rate of total organic carbon fluctuated between 200 and 400 mg d-1 and methanogenesis in the refuse column was only partly activated. The hydrolysis rate of refuse fed with anaerobically pre-treated leachate was the highest among the three solutions. The high alkaline levels of the anaerobically pre-treated leachate and its methanogenic bacteria led to an early activation of methanogenesis in the refuse columns. The VFAs contributed approximately 40-60% of TOC in tap-water-fed columns, 60-80% of TOC in the columns fed aerobically pre-treated leachate, and up to 70-90% of TOC in columns fed with anaerobically pre-treated leachate. The feed solution had considerably affected leachate characteristics, and then the build-up of the methanogenesis in the refuse column and the composition of fermentation products in the leachate. The success of a bioreactor landfill depends on whether the recycled leachate could yield a favorable methanogenic environment in the top refuse layer, or whether an appropriate pre-treatment is adopted to modify the leachate characteristics. 相似文献
532.
考察了3种不同硅铝比的ZSM-5沸石分子筛(25H、38H和50H,25、38和50为硅铝比)对水中Cu2+的吸附过程及其影响因素。结果表明,3种材料均能有效吸附去除水中Cu2+离子,动力学符合假二阶动力学模型,吸附等温线符合Langmuir吸附等温式。3种材料吸附速率及吸附容量顺序为:25H〉50H〉38H,其中,25H最大吸附容量达到12.83mg/g。投加量由0.8g/L增加至2.0g/L,材料对Cu2+吸附去除率由87.0%增加至97.5%。考察水中常见阳离子对吸附的干扰作用,结果表明,干扰离子的影响顺序为:Pb2+〉K+〉Na+〉Mg2+;随着干扰离子浓度的增大,材料对Cu2+的去除率显著下降。硅铝比及晶粒形貌均对沸石分子筛吸附Cu2+有较大影响,小的孔径不利于Cu2+的吸附,低硅铝比有利于Cu2+在分子筛上的吸附。 相似文献
533.
534.
Jingjing Dong Chengzhi Hu Weixiao Qi Xiaoqiang An Huijuan Liu Jiuhui Qu 《环境科学学报(英文版)》2020,32(5):35-42
Much attention has been paid to the pollutant dimethylarsenic acid(DMA),because of its high toxicity even at very low doses.Although TiO_2 photocatalytic oxidation(PCO) is one of the few effective methods for treating DMA-containing water,the efficient decomposition of DMA and simultaneous removal of toxic arsenic species remains a significant but challenging task.Here,defective mesoporous TiO_2 with mixed-phase structure was synthesized and used as both photocatalyst and adsorbent for DMA removal.Due to the reduced band-gap and enhanced separation of photogenerated charge carriers, the oxygen-deficient TiO_2 nanostructures exhibited 4.2 times higher PCO efficiency than commercial TiO_2(P25).More importantly,the high surface area of the mesoporous TiO_2 provided sufficient active sites for in-situ adsorption and reaction,resulting in the efficient removal of as-formed As(V).Combining the experimental and characterization results,the different roles of reactive species during PCO reactions were clarified.In the presence of hole(h~+) as the dominant oxidation species,DMA was demethylated and transformed into MMA.Thereafter,MMA was subsequently reduced to As(Ⅲ) by photo-generated electrons.Superoxide radicals(O_2~(·-)) played a significant role in oxidizing As(Ⅲ) into As(Ⅴ),which was finally adsorptively removed by the mesoporous TiO_2. 相似文献
535.
536.
Elemental mercury (Hg^0) in flue gases can be efficiently captured by mercury chloride (HgCl2) solution. However, the absorption behaviors and the influencing effects are still poorly understood. The mechanism of Hg^0 absorption by HgCl2 and the factors that control the removal were studied in this paper. It was found that when the mole ratio of Cl^- to HgCl2 is 10:1, the Hg^0 removal efficiency is the highest. Among the main mercury chloride species, HgCl3^- is the most efficient ion for Hg^0 removal in the HgCl2 absorption system when moderate concentrations of chloride ions exist. The Hg^0 absorption reactions in the aqueous phase were investigated computationaIIy using Moller-Plesset perturbation theory. The calculated Gibbs free energies and energy barriers are in excellent agreement with the results obtained from experiments. In the presence of SO3^2- and SO2, Hg^2+ reduction occurred and Hg^0 removal efficiency decreased. The reduced Hg^0 removal can be controlled through increased chloride concentration to some degree. Low pH value in HgCla solution enhanced the Hg^0 removal efficiency, and the effect was more significant in dilute HgCl2 solutions. The presence of SO4^2- and NO3^- did not affect Hg^0 removal by HgCl2. 相似文献
537.
羟基氧化铁催化臭氧氧化去除水中阿特拉津 总被引:2,自引:0,他引:2
以实验室制备的羟基氧化铁(FeOOH)为催化剂,研究了其催化臭氧氧化去除水中痕量阿特拉津的效能,并对影响催化效果因素及降解机理进行了探讨。在本实验条件下,反应8 min时催化氧化阿特拉津的去除率比单独臭氧氧化高出63.2%,而FeOOH对阿特拉津的吸附量很小,结果表明,FeOOH对臭氧氧化水中的痕量阿特拉津具有明显的催化活性。探讨了催化剂投量、pH、阿特拉津初始浓度和重碳酸盐碱度对催化氧化阿特拉津的影响。催化剂最佳投量为150 mg/L,去除率随pH和阿特拉津初始浓度的增加而升高,重碳酸盐浓度为200 mg/L时催化作用受到明显抑制。通过研究叔丁醇对催化反应的影响间接推断了催化反应的机理,叔丁醇作为羟基自由基抑制剂有效地抑制了水中羟基自由基的生成和它对阿特拉津的氧化反应,间接证明这种催化作用遵循羟基自由基的反应机理。 相似文献
538.
Xingyue Qu Peihe Zhai Longqing Shi Xingwei Qu Ahmer Bilal Jin Han Xiaoge Yu 《Frontiers of Environmental Science & Engineering》2023,17(6):70
539.
Yujun Zhou Qinghua Ji Chengzhi Hu Huijuan Liu Jiuhui Qu 《Frontiers of Environmental Science & Engineering》2023,17(1):11
540.