Hornmclaughlin4202

This paper re-assesses the relationship between economic growth and pollution emissions using a large panel of 146 economies over the period 1990-2016. For our empirical investigation, we rely upon a panel smooth threshold regression (PSTR) model which is a more flexible method for appraising cross-country heterogeneity and time instability. Furthermore, we analyze additional non-linearities in the income-pollution nexus coming from trade openness and financial development channels. Our empirical findings support the existence of environmental Kuznets curve hypothesis for the global sample as well as for income-specific sub-samples. Our sub-sample results show stark differences in the threshold points and the latter increase with the level of economic development. Finally, our investigation of the indirect channels reveals that both trade openness and financial development mediate the adverse effects of income on the pollution emissions of the selected countries. These findings enable us to advance some very important policy implication for the sample economies.Palladium (Pd) is widely used in automotive catalytic converters to reduce toxic gas emissions. The input of Pd in the rainfall-runoff is an important contributing factor to the accumulation of Pd in receiving water bodies. selleckchem In this study, the Meishe River in Haikou, Hainan Province, China, was used as the research area, and palladium (Pd) was selected as the target pollutant. This study explored the response of Pd in the receiving water body to rainfall-runoff and to analyze the influencing factors. The results showed that the dissolved Pd concentration in the receiving water body had a corresponding relationship with that in rainfall-runoff. The response of suspended Pd in the receiving water body to rainfall-runoff was closely related to the location of the drainage outlet. Compared with that of suspended Pd, the response of dissolved Pd in the receiving water body to that in the rainfall-runoff was more obvious. Seven meters downstream from the outfall was the most sensitive response distance of dissolved Pd in receiving water bodies to rainfall-runoff, and the response time was approximately 0-10 min. The suspended Pd at 3 m downstream from the outfall also had a certain response to the rainfall-runoff, and the response time was approximately 15-25 min. The response time of the suspended Pd in the receiving water body depended largely on the first flush ability of the runoff. There was a moderately positive correlation between the dissolved Pd and Cl- in the receiving water body (r = 0.687; p  less then  0.05). The effects of pH, Eh, and total suspended solids (TSS) on suspended Pd were reduced in the response process of the receiving water body. The synergistic effect of multiple factors increased the uncertainty of the Pd response.Antibiotics and nonsteroidal anti-inflammatory drugs (NSAIDs) have a wide range of bioactivities and are released into the ecosystem in large amounts. Heretofore, little information is available regarding their potential risk to the phytoplankton assemblage. Different alpha, taxonomic, and beta diversity measures were investigated and linked to the spatial variation of nine drugs. Distance-based redundancy analysis (dbRDA) indicated that pharmaceutical pollution had adverse effects on both phytoplankton diversity and taxonomic structure leading to the existence of congeneric taxa. However, different phytoplankton groups respond differently to different pharmaceuticals and Cyanoprokaryotes was suggested as the most sensitive group. According to the EC50 value and the detected concentration for each drug, a hazard index (Hq) was calculated for each polluted site to investigate environmental risk analysis. Increasing Hq values exhibited negative effects on phytoplankton diversity. Phytoplankton community was characterized by high beta diversity values, which suggested that microalgae were able to disperse and select suitable environmental conditions. High beta diversity values were driven by species difference rather than species replacement due to the disappearance of most sensitive taxa from highly polluted sites. Additionally, microalgae were classified into different morpho-functional groups (FGs), and principal component analysis (PCA) indicated that different FGs had different responses to pharmaceutical pollution. A laboratory toxicity experiment was also conducted to identify the negative effects of short-term exposure to low doses of paracetamol and ciprofloxacin.Glyphosate (N-[phosphonomethyl]glycine) is one of the most popular herbicides now used in agricultural practice. The aim of this paper was to discuss the research progress and innovations in recent years on the mitigation of glyphosate (GLY) from aqueous media by adsorption. The ecotoxicology of GLY was discussed in the domain of its chronic and sub-chronic toxicity, genotoxicity, reproductive toxicity, and carcinogenicity, and potential risks of food contamination were discussed. It was observed that polymers and resins are the best class of adsorbents for GLY adsorption from aqueous media. GLY adsorption was best fit to either Freundlich or Langmuir isotherm depending on the nature of the adsorbent. The pseudo-second-order kinetics was also the best fit for modelling the kinetics of GLY adsorption. A review of the thermodynamics revealed that GLY adsorption was usually spontaneous and exothermic. Research trends and knowledge gaps are in the area of chemical mobility in environmental systems (especially in the presence of other chemical species), the use of heavy metal-laden adsorbent and molecular modelling. Furthermore, it was observed that the ecotoxicology of GLY still has some contentious areas where there is no conclusive stance.This work presented facile fabrication of carbon nitride (CN)/zinc titanate (ZT) heterojunction by one-step ball milling process for visible light-induced photocatalytic degradation. The phase structures, morphologies, functional groups, and optical properties of the prepared materials were systematically characterized by XRD, FTIR, UV-Vis DRS, and SEM techniques. The ball milling for 10 min significantly improved visible light absorption properties; the as-synthesized ZT/CN catalyst (2.8 eV) showed lower band gap energy than bare ZT (3.2 eV). This result revealed a successful incorporation. The photocatalytic activities of the heterostructure catalysts (ZT/CN) evaluated by degrading tetracycline under visible light irradiation and highest TC removal rate were obtained as 0.0193 min-1 for ZT/CN/5, which was 6.2 times higher than that of bare CN. The most efficient photocatalyst (ZT/CN/5) could be performed three times without any loss of phase. In addition, the heterostructure catalyst was found as promising candidate for efficient photocatalytic degradation of other antibiotics and dye components.