Journal of Environmental Chemical Engineering最新文献

The surface modification of Poly (acrylamide-co-methylenbisacrylamide-co-N-(4-(2-(phenylcarbamothioyl)hydrazineyl)phenyl)methacrylamide) as a sensor (AR) via titanium dioxide as a novel colorimetric nanocomposite sensor with high sensitivity and selectivity for determination of fluoride anion was described. The colorimetric response of the AR has been screened in dimethyl sulfoxide /Water with a volumetric ratio of 7:3 and acetonitrile in separate media with equal amounts of various anions. In the presence of the mentioned anionic solutions, only the solutions containing fluoride ions, made a significant change in color from pale yellow to orange-red via the –NH deprotonation mechanism, which could be detected with the naked eye. The Box-Behnken design, response surface methodology through UV-Vis spectroscopy techniques in various pH and temperatures and reaction times were tested to optimize the AR conditions. Also, a lateral flow assay test of the synthesized AR detected fluoride ions in real-life samples, including water, contrary to different sources such as toothpaste and mouthwash. Furthermore, according to the World Health Organization report on fluoride ion toxicity in water, the detection limit of the AR was lower than of the declared level.

Natural landscape water and substrate were taken to simulate the release of substrate pollutants in micropolluted water bodies, and a calcium silicate- sodium alginate (CS-SA) bioremediation system was constructed. The removal of ammonium nitrogen (NH₄⁺-N), total nitrogen (TN) and Phosphate (PO₄^3--P) were 99.14 %, 98.90 % and 84.44 %, respectively. The Ca²⁺ continuously released by CS-SA provided good microbial-induced calcium precipitation (MICP) conditions for Acinetobacter calcoaceticus strain HM12, and the removal efficiency of both Zn²⁺ and Cd²⁺ was 100 %, and the pH after remediation was consistent with that of natural water bodies. NH₄⁺-N was removed by heterotrophic nitrification- aerobic denitrification (HN-AD) of strain HM12, and heavy metals and phosphorus were removed by co-precipitation and adsorption by MICP. High-throughput sequencing results showed that strain HM12 was effective as a bioinoculant for the remediation of the aquatic environment. The construction and operation of this bioremediation system provided a method for micropolluted water treatment and recovery of phosphorus and heavy metals.

Leveraging solar irradiation for regenerating amine materials presents a promising alternative to conventional steam-based CO₂ regeneration, potentially mitigating environmental concerns associated with rising CO₂ levels. However, this method has limitations and needs substantial improvements in both regeneration efficiency and photo-thermal conversion efficiency, which are closely tied to the performance of the photo-thermal materials. The development of highly efficient photo-thermal conversion materials is crucial for the successful implementation of this technology. In this review, we focus on the utilization of light-irradiated amine materials for CO₂ regeneration and conversion. We compare and analyze their performance in terms of regeneration efficiency, temperature achieved, properties of the photo-thermal conversion materials and advantages and disadvantages of various photo-thermal materials. Additionally, we provide suggestions for enhancing these materials based on the research findings and discuss the potential future directions. Moreover, we address the challenges and feasibility of replacing traditional steam-based methods with light-activated CO₂ regeneration in industrial applications, aiming to foster more efforts towards the industrial-scale utilization of solar-irradiated CO₂ regeneration and conversion.

Amine-functionalized graphene oxides (AFGOs) are potential candidates for CO₂ capture applications, as the amine functional groups could act as effective sites, promoting CO₂ adsorption strength and selectivity. However, the CO₂ adsorption mechanism on AFGO appears to be ambiguous, particularly with no explicit identification of the chemically bonded species. In this work, density functional theory and microkinetic simulations were carried out to investigate the physical and chemical adsorption mechanisms and behavior between AFGO and CO₂. Our findings indicate that the van der Waals and hydrogen bonding (HB) interactions constitute physical binding modes between the aminated GO and CO₂. The chemical adsorption pathways on AFGO materials have been revealed by the transition state search method, in which the relevant CO₂ adsorption species, including carbamic acid and carbamate, and their formation conditions were theoretically identified on AFGOs. The chemisorption mechanisms have been recognized to be the nucleophilic interaction between GO-supported amines and CO₂, simultaneously assisted by the cooperative effect of multiple HB interactions. More specifically, the surface hydroxyl groups and water molecules can serve as proton transfer media and offer HB interactions, thus regulating the reaction activity and chemical adsorption species. This theoretical work presents a new insight into CO₂-AFGO interaction mechanisms, which is valuable for designing aminated GO adsorbents.

This paper investigated the synergistic mechanism of short-chain fluorocarbon surfactant and electrolyte on inhibiting coal dust pollution via the experimental and molecular dynamics simulations Findings illustrated that the synergistic application of short-chain fluorocarbon and electrolyte achieves better dust suppression performance when compares with the individual application of FS-50 and FS-3100, the maximum suppression rates for FS-50 and FS-3100 after the addition of electrolytes are 94.48 % and 93.94 %, respectively. The addition of electrolyte reduces the diffusion coefficient of suppressants, and its effect on FS-3100 is much higher than on FS-50. The maximum particle size achieved by FS-50 reaches 304–344 μm, while only 238–269 μm and 269–306 μm are acquired by FS-3100. The smaller negative potential and the larger difference in EPE indicate that the addition of NaCl promotes the adsorption of H₂O molecules by surfactants. Compared to FS-3100, FS-50 has a lower negative potential and a larger EPE difference, suggesting that FS-50 exhibits stronger reactivity and better ability of absorb ion hydrates and H₂O molecules, and hence has superior agglomeration effect. The addition of NaCl also promotes the generation of more sodium hydrate ions and hydrated chloride ions, which enhances the ability of FS-3100 to absorb H₂O. Compares with FS-50, due to special curved spatial configuration and the synergistic effect with electrolytes, FS-3100 could restrict the desorption of large numbers of H₂O molecules more effectively, and therefore exhibiting better wettability.