植物酶膜萃取-气相色谱分析水体中痕量有机磷农药

建立了植物酶膜萃取 气相色谱分析水体中痕量有机磷农药的方法 .实验表明 ,选用精面粉作为酶源并用纯水萃取所得的植物酶最为合适 .乐果、对硫磷和甲基对硫磷三种有机磷农药的检测限为 0 1 μg·l- 1;多次测定三种农药的加标回收率均达70 %以上 .     

Modeling the non-linear relationship between financial development and energy consumption: statistical experience from OECD countries

The linkage between financial development and energy consumption is widely investigated in the literature. However, the non-linear relationship between financial development and energy demand is still under debate. Therefore, this study aims to examine the non-linear relationship between financial development, economic growth, and energy consumption in OECD countries. The study uses the Driscoll–Kraay standard errors panel regression model for spanning from 1980 to 2016. The empirical findings indicate that an inverted U-shape relationship exists between financial development and energy consumption as well as between economic growth and energy consumption. Moreover, the feedback hypothesis is found between financial development and energy use. Additionally, income and energy use granger cause each other. The innovative findings contribute to extant literature, which is of special interest to the country’s policymakers regarding energy efficiency.

     

Methyl siloxanes in road dust from a large silicone manufacturing site in China: implications of human exposure

Environmental Science and Pollution Research - Methyl siloxanes are becoming increasingly prevalent in the environment because of their extensive use in various consumer products. Little is known...     

Simultaneously attenuating antibiotic resistance genes and improving the dewaterability of sewage sludge by conditioning with Fenton’s reagent: the pivotal role of sludge pre-acidification

Environmental Science and Pollution Research - Fenton conditioning processes have been recently employed to improve the dewaterability of sewage sludge. However, it remains unclear whether the...     

Municipal waste treatment efficiency in 29 OECD countries using three-stage Bootstrap-DEA model

Environment, Development and Sustainability - Rapid urbanization has led to a sharp increase in municipal waste generation, which has resulted in significant environmental problems. However, the...     

Association of caffeine and caffeine metabolites with obesity among children and adolescents: National Health and Nutrition Examination Survey (NHANES) 2009–2014

Environmental Science and Pollution Research - The effect of caffeine exposure on children’s health remains poorly understood. We aimed to characterize the associations of caffeine and...     

Organic–inorganic calcium lignosulfonate compounds for soil acidity amelioration

Environmental Science and Pollution Research - Soil acidification is a problem widely occurring worldwide, which severely threaten food security and agricultural sustainability. Calcium...     

营销管理信息系统

本文从营销管理信息系统的构成、营销管理信息系统与企业营销过程的关系、营销管理信息系统的作用、内部记录系统、营销决策支持系统等几个方面对企业的营销管理信息系统进行了浅显的讨论。     

浅析市场经济体制下高等学校教职工的激励因素

如何调动广大教师的积极性,已成为非常重要的课题。本文通过对教师激励因素的探讨,阐明在市场经济体制下,高等学校如何调动教师工作的积极性、主动性和创造性,更好地完成教育、教学任务。     

Synthesis and application of Cu-BTC@ZSM-5 composites as effective adsorbents for removal of toluene gas under moist ambience: kinetics,thermodynamics, and mechanism studies

Metal organic frameworks (MOFs) are excellent adsorbents that provide abundant specific surface area, adjustable pore structure, and rich active sites. The purpose of this study was to prepare composites with hydrophobic and high microporous specific surface area and to adsorb toluene gas in moist ambience. An ethanol activation-assisted hydrothermal method was proposed to synthesize copper-benzene-1,3,5-tricarboxylic acid (Cu-BTC) metal-organic framework, Cu-BTC, and ZSM-5 molecular sieve composites (Cu-BTC@ZSM-5). The dynamic adsorption process of toluene on different adsorbents was investigated, and the results showed that the toluene adsorption capacity of Cu-BTC@ZSM-5 (158.6 mg/g) was 2.53 times higher than Cu-BTC (62.7 mg/g), when the ZSM-5 content is 5% and the humidity is 30%RH. Compared with other factors, the humidity inhibited the adsorption of toluene on Cu-BTC@ZSM-5. Langmuir model and the pseudo-second kinetics model can better describe the adsorption behavior of Cu-BTC@ZSM-5. The thermodynamic results showed the adsorption process was a spontaneous exothermic process at low temperature and mainly physical adsorption. The relative regenerability can still up to 80.4% after six cycles. The adsorption mechanisms of Cu-BTC@ZSM-5 were pore-filling adsorption, π-π interaction, cation-π bonding, and hydrophobic interactions. This study will help to design a systematic route to evaluate the adsorption performance of Cu-BTC@ZSM-5 for toluene.