This study aims to assess the impact of technological innovation on green total factor productivity (GTFP), within Organization for Economic Cooperation and Development (OECD) countries, by using a panel data over the period 1996–2017. The results show that technological innovation has a significant positive influence on GTFP. The interaction between technological innovation and the economic development level has a significant negative impact on GTFP. However, the interaction between technological innovation and foreign direct investment (FDI) has no significant influence on GTFP. In addition, technological innovation has a positive effect on GTFP when the economic development level is lower than the threshold value. However, technological innovation has an otherwise insignificant promotional effect. Technological innovation has a positive effect on GTFP when FDI is below the threshold value, and it has a slightly significant positive impact when FDI exceeds the threshold value. Therefore, various measures should be taken to guide technological innovation and improve its quality to promote GTFP and realize sustainable development. 相似文献
With scholars paying increasing attention to energy sustainability, integrating energy sustainable utilization into the energy-related assessment framework is particularly useful for achieving SDG7. This study empirically assesses the energy-related efficiency (EE) comprised of the energy utilize stage and energy sustainable stage in China using a dynamic two-stage data envelopment analysis model, and its influencing factors including digital economy with fixed-effect models. The findings reveal a slight downward trend of EE from 2011 to 2020, primarily due to the poor performance of energy utilize stage. The subregional analysis illustrates that increasing clean energy use (CEU) is more beneficial to energy efficiency than reducing carbon emissions (CER). Dagum Gini coefficients indicate a growing disparity between regions. Additionally, a “U-shaped” relationship between digital economy and EE is found, but two-thirds provinces of China have not yet surpassed the turning point. Moreover, different degrees of CEU and CER will influence the impact of digital economy on EE. Environmental regulations and green technology innovation play positive moderating roles in the “U-shaped” relationship. This study recommends to stimulate the energy sustainable use through higher adoption of clean energy sources and carbon emissions reduction, as well as highlight the green value of the digital economy. 相似文献
MnO2 microspheres with various surface structures were prepared using the hydrothermal method, and Au/MnO2 catalysts were synthesized using the sol-gel method. We obtained three MnO2 microspheres and Au/MnO2 samples: coherent solid spheres covered with wire-like nanostructures, solid spheres with nanosheets, and hierarchical hollow microspheres with nanoplatelets and nanorods. We investigated the properties and catalytic activities of formaldehyde oxidation at room temperature. Crystalline structures of MnO2 are the main factor affecting the catalytic activities of these samples, and γ-MnO2 shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of γ-MnO2. The gold-supported interaction can change the redox properties of catalysts and accelerate surface oxygen species transition, which can account for the catalytic activity enhancement of Au/MnO2. We also studied intermediate species. The dioxymethylene (DOM) and formate species formed on the catalyst surface were considered intermediates, and were ultimately transformed into hydrocarbonate and carbonate and then decomposed into CO2. A proposed mechanism of formaldehyde oxidation over Au/MnO2 catalysts was also obtained. 相似文献
To improve nitrogen removal performance of wastewater treatment plants (WWTPs), it is essential to understand the behavior of nitrogen cycling communities, which comprise various microorganisms. This study characterized the quantity and diversity of nitrogen cycling genes in various processes of municipal WWTPs by employing two molecular-based methods:most probable number-polymerase chain reaction (MPN-PCR) and DNA microarray. MPN-PCR analysis revealed that gene quantities were not statistically different among processes, suggesting that conventional activated sludge processes (CAS) are similar to nitrogen removal processes in their ability to retain an adequate population of nitrogen cycling microorganisms. Furthermore, most processes in the WWTPs that were researched shared a pattern:the nirS and the bacterial amoA genes were more abundant than the nirK and archaeal amoA genes, respectively. DNA microarray analysis revealed that several kinds of nitrification and denitrification genes were detected in both CAS and anaerobic-oxic processes (AO), whereas limited genes were detected in nitrogen removal processes. Results of this study suggest that CAS maintains a diverse community of nitrogen cycling microorganisms; moreover, the microbial communities in nitrogen removal processes may be specific.
Porous carbon is an excellent absorbent for pollutants in water. Here, we report a breakthrough in performance of porous carbon based on lignin prepared using sodium lignosulfonate (SLS), potassium carbonate and melamine as precursor, activator and nitrogen source, respectively. A series of characterization tests confirmed that in-situ nitrogen doping greatly enhanced porous structure, resulting in a specific surface area of 2567.9 m2 g?1 and total pore volume of 1.499 cm3 g?1, which is nearly twice that of non-nitrogen-doped porous carbon. Moreover, adsorption experiments revealed that at 303 K, the saturated adsorption capacity of chloramphenicol was as high as 713.7 mg g?1, corresponding to an improvement of 33.7%. Further, the prepared porous carbon exhibited a strong anti-interference against metal ions and humic acid. The adsorption process was confirmed to be an endothermic reaction dominated by physical adsorption, indicating that an increase in temperature is conducive to adsorption. The results of this study show that nitrogen-doped lignin-based porous carbon prepared by in-situ doping is a promising material to significantly alleviate water pollution owing to its low cost, excellent pore structure and good adsorption properties.
Environmental Science and Pollution Research - Currently, sustainable utilization, including recycling and valorization, is becoming increasingly popular in waste management. Black soldier fly... 相似文献
