全文获取类型
收费全文 | 403篇 |
免费 | 72篇 |
国内免费 | 236篇 |
专业分类
安全科学 | 35篇 |
废物处理 | 72篇 |
环保管理 | 57篇 |
综合类 | 373篇 |
基础理论 | 64篇 |
污染及防治 | 99篇 |
评价与监测 | 4篇 |
社会与环境 | 3篇 |
灾害及防治 | 4篇 |
出版年
2024年 | 1篇 |
2023年 | 14篇 |
2022年 | 25篇 |
2021年 | 34篇 |
2020年 | 26篇 |
2019年 | 28篇 |
2018年 | 34篇 |
2017年 | 19篇 |
2016年 | 32篇 |
2015年 | 29篇 |
2014年 | 27篇 |
2013年 | 49篇 |
2012年 | 66篇 |
2011年 | 40篇 |
2010年 | 18篇 |
2009年 | 34篇 |
2008年 | 25篇 |
2007年 | 34篇 |
2006年 | 33篇 |
2005年 | 21篇 |
2004年 | 17篇 |
2003年 | 23篇 |
2002年 | 12篇 |
2001年 | 14篇 |
2000年 | 8篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 4篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1977年 | 4篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1972年 | 3篇 |
1971年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有711条查询结果,搜索用时 531 毫秒
91.
92.
Chunxu Wu Lanfeng Li Hao Zhou Jing Ai Hongtao Zhang Jialin Tao Dongsheng Wang Weijun Zhang 《环境科学学报(英文版)》2021,33(2):340-352
This study aimed to explore the adsorption performance of sludge-based activated carbon (SBC) towards dissolved organic matters (DOMs) removal from sewage, and investigated the modification effect of different types of chemicals on the structure of synthesized SBC. Waste activated sludge (WAS) was used as a carbon source, and HCl, HNO3, and NaOH were used as different types of chemicals to modify the SBC. With the aid of chemical activation, the modified SBC showed higher adsorption performances on DOMs removal with maximum adsorption of 29.05 mg/g and second-order constant (k) of 0.1367 (L/mol/sec) due to the surface elution of ash and minerals by chemicals. The surface elemental composition of MSBC suggested that the content of C-C and C-O functional groups on the surface of modified sludge-based activated carbon (MSBC) played an important role on the adsorption capacities of MSBC towards DOMs removal in sewage. Additionally, the residual molecular weight of DOMs in sewage was investigated using a 3-dimension fluorescence excitation-emission matrix (3D-EEM) and high-performance size exclusion chromatography (HP-SEC). Results showed that the chemical modification significantly improved the adsorption capacity of MSBC on humic acids (HA) and aromatic proteins (APN), and both of NaOH-MSBC and HCl-MSBC were effective for a wide range of different AMW DOMs removal from sewage, while the HNO3-MSBC exhibited poorly on AMW organics of 2,617 Da and 409 Da due to the reducing content of macropore. In brief, this study provides reference values for the impact of the chemicals of the activation stage before the SBCs application. 相似文献
93.
以水稻秸秆为原料,经炭化、KMnO4预氧化和FeSO4溶液改性后,制备得到低成本的改性炭化水稻秸秆(modified carbonized rice straw,MCRS).采用Zeta电位分析仪、扫描电镜、能谱仪、比表面积分析仪、红外光谱分析仪和X射线衍射分析仪多种手段,分析了炭化水稻秸秆和MCRS的理化性能.通过静态吸附试验研究了吸附剂投加量、pH值和温度对MCRS除磷效果的影响.结果表明:MCRS对磷的吸附是一个吸热过程,其吸附等温线可用Langmuir方程进行拟合.当投加量为4g·L^-1、pH值为7时,MCRS对水溶液中磷的去除率最高可达96%;依据Langmuir方程计算得到,30℃条件下,MCRS对磷的最大吸附量为5.49 mg·g^-1. 相似文献
94.
Fenton氧化法修复石油污染土壤的研究进展 总被引:1,自引:0,他引:1
传统的Fenton氧化法(Fe2+/H2O2)因反应速度过快、需要定期补充Fe2+、控制pH值≤3等方面的限制而影响到石油烃类污染土壤的修复效果.本文综述了近年来Fenton反应中氧化剂、催化剂的改进及其对土壤中石油污染物的去除效率,揭示了土壤性质、反应条件、污染物结构及非均相催化剂比表面积等因素对去除效率的影响,介绍了超声波前置处理后,Fenton试剂与土壤上解吸的石油污染物接触几率的增加及石油烃类可生物降解性的提高,促进了微生物的后续处理效果,并对该领域的研究趋势进行了展望. 相似文献
95.
96.
膜的改性及其在环境领域应用研究进展 总被引:1,自引:0,他引:1
膜改性由于具有清洁、廉价、节能等特点,近年来得到快速发展,是解决膜污染的有效方法之一。本文综合介绍了膜的基体改性、表面改性这两种改性类型和目前常用的改性方法包括表面涂覆、表面活性剂改性、化学修饰改性、仿生改性等等,并简单介绍了膜改性在环境领域的应用,探讨了膜改性今后的发展。 相似文献
97.
Removal of phosphate from wastewater using alkaline residue 总被引:2,自引:0,他引:2
Yubo Yan Xiaodong Liu Xiuyun Sun Fangbian M Lianjun Wang Jiansheng Li Jinyou Shen 《环境科学学报(英文版)》2014,26(5):970-980
Alkaline residue(AR) was found to be an efficient adsorbent for phosphate removal from wastewater. The kinetic and equilibrium of phosphate removal were investigated to evaluate the performance of modified alkaline residue. After treatment by NaOH(AR-NaOH), removal performance was significantly improved, while removal performance was almost completely lost after treatment by HCl(AR-HCl). The kinetics of the removal process by all adsorbents was well characterized by the pseudo second-order model. The Langmuir model exhibited the best correlation for AR-HCl, while AR was effectively described by Freundlich model. Both models were well fitted to AR-NaOH. The maximum adsorption capacities calculated from Langmuir equation were in following manner: AR-NaOH AR AR-HCl. Phosphate removal by alkaline residue was pH dependent process. Mechanisms for phosphate removal mainly involved adsorption and precipitation, varied with equilibrium pH of solution. For AR-HCl, the acid equilibrium pH( 6.0) was unfavorable for the formation of Ca-P precipitate, with adsorption as the key mechanism for phosphate removal. In contrast, for AR and ARNaOH, precipitation was the dominant mechanism for phosphate removal, due to the incrase on pH( 8.0) after phosphate removal. The results of both XRD and SEM analysis confirmed CaHPO4·2H2O formation after phosphate removal by AR and AR-NaOH. 相似文献
98.
为进一步提高电极生物膜反应器的脱氮效能,采用导电聚合物聚噻吩(PTh)和电子穿梭体蒽醌-2,6-二磺酸二钠(AQDS)改性阴极材料石墨毡,系统研究了不同碳氮比(C/N)条件下,改性电极的应用对BER体系的脱氮效能、电极表面生物相和体系微生物群落结构等方面的影响.结果表明,应用PTh与AQDS协同处理石墨毡的BER体系的NO~-_3-N去除速率和效能均明显优于未处理电极体系,在HRT=4 h、C/N为2.0时NO~-_3-N的去除率达到90.0%以上.PTh/AQDS改性石墨毡电极的生物膜与电极的比重为0.26±0.04,其值为对照组的2.4倍,证明了PTh/AQDS改性后电极具有更优的生物相容性.应用PTh/AQDS改性电极的BER具有更好的微生物丰富度和多样性,AQDS促进了特定微生物Thauera_mechernichensis(24.6%)的富集和亚硝酸盐还原酶的活性,保障了BER体系的反硝化效能. 相似文献
99.
Adsorption of mixed cationic-nonionic surfactant and its effect on bentonite structure 总被引:1,自引:0,他引:1
The adsorption of cationic-nonionic mixed surfactant onto bentonite and its effect on bentonite structure were investigated. The objective was to improve the understanding of surfactant behavior on clay mineral for its possible use in remediation technologies of soil and groundwater contaminated by toxic organic compounds. The cationic surfactant used was hexadecylpyridinium bromide (HDPB), and the nonionic surfactant was Triton X-100 (TX100). Adsorption of TX100 was enhanced significantly by the addition of HDPB, but this enhancement decreased with an increase in the fraction of the cationic surfactant. Part of HDPB was replaced by TX100 which decreased the adsorption of HDPB. However, the total adsorbed amount of the mixed surfactant was still increased substantially, indicating the synergistic effect between the cationic and nonionic surfactants. The surfactant-modified bentonite was characterized by Brunauer-Emmett-Teller specific surface area measurement, Fourier transform infrared spectroscopy, and thermogravimetric-derivative thermogravimetric/differential thermal analyses. Surfactant intercalation was found to decrease the bentonite specific surface area, pore volume, and surface roughness and irregularities, as calculated by nitrogen adsorption-desorption isotherms. The co-adsorption of the cationic and nonionic surfactants increased the ordering conformation of the adsorbed surfactants on bentonite, but decreased the thermal stability of the organobentonite system. 相似文献
100.
《大气污染防治法》(修订草案)有很多突破,但是针对性、策略性、特色性和可实施性均存在欠缺,需要进一步把生态文明、绿色化、区域协同发展的要求纳入立法目的,体现在体制制度和机制的设计中;理顺立法体例,保证规定的逻辑性;坚持空间管控和多规合一,坚持空气质量目标管理的思路,采取实际大气环境容量和实时排放流量控制相结合的工作模式;明确行动计划与现行环境保护规划、各专项环保规划的关系;理顺监管体制,创新区域联合防治的制度和机制,弥补侵权法律责任和法律救济规定的不足,保持信息公开申请和环境民事公益诉讼提起条件的前后贯通性。只有这样,才能既体现立法修改的必要性和针对性,又体现立法规定的时代性和特色性,展现法律措施的严格性和法律责任的严厉性。 相似文献