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排序方式: 共有59条查询结果,搜索用时 422 毫秒
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H. Daraei A. Mittal M. Noorisepehr F. Daraei 《Environmental science and pollution research international》2013,20(7):4603-4611
The aim of the present research is to develop economic, fast, and versatile method for the removal of toxic organic pollutant phenol from wastewater using eggshell. The batch experiments are conducted to evaluate the effect of pH, phenol concentration, dosage of adsorbent, and contact time on the removal of phenol. The paper includes in-depth kinetic studies of the ongoing adsorption process. Attempts have also been made to verify Langmuir and Freundlich adsorption isotherms. The morphology and characteristics of eggshell have also been studied using scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray fluorescence analysis. At ambient temperature, the maximum adsorption of phenol onto eggshells has been achieved at pH 9 and the contact time, 90 min. The experimental data give best-fitted straight lines for pseudo-first-order as well as pseudo-second-order kinetic models. Furthermore, the adsorption process verifies Freundlich and Langmuir adsorption isotherms, and on the basis of mathematical expressions of these models, various necessary adsorption constants have been calculated. Using adsorption data, various thermodynamic parameters like change in enthalpy (?H 0), change in entropy (?S 0), and change in free energy ?G 0 have also been evaluated. Results clearly reveal that the solid waste material eggshell acts as an effective adsorbent for the removal of phenol from aqueous solutions. 相似文献
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Alok Mittal 《毒物与环境化学》2013,95(10):1813-1823
Bottom ash and de-oiled soya have been evaluated as potential adsorbents for the removal of a water soluble azo dye. The characterization of the adsorbents has been performed using infrared spectroscopy and differential thermal analysis. A batch of adsorption method has been adopted for studying the effects of pH, adsorbate concentration, and particle size on the adsorption process. The experimental data were tested using Langmuir, Freundlich, Tempkin, and Dubinin–Radushkevich isotherms and their parameter constants were determined. The thermodynamics showed that the process is spontaneous and exothermic. The kinetic studies revealed that the adsorption process follows first-order kinetics. A fixed-bed adsorption experiment resulted in 89% and 94% saturation of bottom ash and de-oiled soya, respectively, indicating that both adsorbents can be potentially economical. 相似文献
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Daraei Hasti Mittal Alok Toolabian Kimia Mittal Jyoti Mariyam Asna 《Environmental science and pollution research international》2023,30(9):22273-22283
Environmental Science and Pollution Research - 2,4-Dinitrophenol (2,4-DNP) is a toxic compound that is widely used in many industrial and agricultural processes. This compound has low... 相似文献
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Environmental Fluid Mechanics - Pedestrian level wind comfort, natural ventilation and pollutant dispersion are strongly influenced by building shape and orientation. In the recent years, the trend... 相似文献
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Bioavailability and risk assessment of trace metals in sediments of a high-altitude eutrophic lake,Ooty, Tamil Nadu,India 总被引:1,自引:0,他引:1
Parthasarathy Purushothaman Asok Manju Ranjan Rajesh Kumar Swain Sujit Kumar 《Environmental science and pollution research international》2021,28(15):18616-18631
Environmental Science and Pollution Research - Ooty lake, in the southern part of India, has raised huge concern about the role of metals in a lake due to increasing anthropogenic activities.... 相似文献
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Gopal Datt Bhatta Hemant Raj Ojha Pramod Kumar Aggarwal V. Rasheed Sulaiman Parvin Sultana Dhanej Thapa Nimisha Mittal Khemraj Dahal Paul Thomson Laxman Ghimire 《Environment, Development and Sustainability》2017,19(2):497-525
While impacts of climate change on agricultural systems have been widely researched, there is still limited understanding of what agricultural innovations have evolved over time in response to both climatic and non-climatic drivers. Although there has been some progress in formulating national adaptation policies and strategic planning in different countries of South Asia, research to identify local-level adaptive strategies and practices is still limited. Through eight case studies and a survey of 300 households in 15 locations in India, Nepal and Bangladesh, this paper generates empirical evidence on emerging agricultural innovations in contrasting socio-economic, geographical and agro-ecological contexts. The study demonstrates that several farm practices (innovations) have emerged in response to multiple drivers over time, with various forms of institutional and policy support, including incentives to reduce risks in the adoption of innovative practice. It further shows that there is still limited attempt to systematically mainstream adaptation innovations into local, regional and national government structures, policies and planning processes. The paper shows that the process of farm-level adaptation through innovation adoption forms an important avenue for agricultural adaptation in South Asia. A key implication of this finding is that there is a need for stronger collaborations between research institutions, extension systems, civil society and the private sector actors to enhance emerging adaptive innovations at the farm level. 相似文献
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Susheel K. Mittal Nirankar Singh Ravinder Agarwal Amit Awasthi Prabhat K. Gupta 《Atmospheric environment (Oxford, England : 1994)》2009,43(2):238-244
Open crop stubble burning events were observed in and around Patiala city, India. A ground level study was deliberated to analyze the contribution of wheat (Triticum aestivum) and rice (Oriza sativa) crop stubble burning practices on concentration levels of aerosol, SO2 and NO2 in ambient air at five different sites in and around Patiala city covering agricultural, commercial and residential areas. Aerosols were collected on GMF/A and QMF/A (Whatman) sheets for a 24 h period throughout the year in 2007. Simultaneously, sampling of SO2 and NO2 was conducted and results obtained during stubble burning periods were compared to the non-stubble burning periods. Results clearly pointed out a distinct increase in aerosol, SO2 and NO2 levels during the crop stubble burning periods. 相似文献