RADIATION RESEARCH
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2023
·Vol. 200
·期 3
·242-255
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IF 3.4
Abdous Slimane,Derradji Mehdi,Mekhalif Zineb,Khiari Karim,Mehelli Oussama,Cherif Younes Bourenane
Given their substantial neutron capture cross-section, extreme hardness, and high chemical and thermal stability, boron-based materials are widely used as building blocks to protect against highly ionizing radiations such as gamma rays and neutrons. Indeed, uncontrolled nuclear radiation exposure can be highly hazardous to radiation workers and the public. In this sense, this work presents an extensive study and experimental evaluation of the nuclear shielding features of hexagonal-boron nitride (h-BN) based nanocomposite, where bisphenol-A based polybenzoxazine (BA-PBz) was used as matrix. The neutron shielding studies were carried out at the nuclear research reactor of Algeria NUR. The surface treatment of h-BN nanoparticles was confirmed by FTIR and XPS techniques. The curing behavior and the degradation phenomena of the nanocomposites were evaluated by DSC-TGA analyses. The distribution of h-BN nanoparticles within the polymer matrix was assessed by TEM and SEM. The results showed that the developed boron nitride-based nanocomposite exhibits intriguing shielding performances and good thermal stability. The DSC-TGA tests exhibit high degradation temperature that reach 279°C. The highest performances were obtained at an h-BN concentration of 7 wt%, where the macroscopic cross was found to be (Σ = 3.844 cm –1 ) with a screening ratio of (S = 96.12%), equivalent to a mean free path (λ) of 0.138 cm.
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Engineering
·
2023
·
IF 12.8
Weiyang Lv,Hao Li,Jinhui Wang,Lixin Wang,Zenglong Wu,Yuge Wang,Wenkai Song,Wenkai Cheng,Yuyuan Yao
Realizing fast and continuous generation of reactive oxygen species (ROSs) via iron-based advanced oxidation processes (AOPs) is significant in the environmental and biological fields. However, current AOPs assisted by co-catalysts still suffer from the poor mass/electron transfer and non-durable promotion effect, giving rise to the sluggish Fe 2+ /Fe 3+ cycle and low dynamic concentration of Fe 2+ for ROS production. Herein, we present a three-dimensional (3D) macroscale co-catalyst functionalized with MoS 2 to achieve ultra-efficient Fe 2+ regeneration (equilibrium Fe 2+ ratio of 82.4%) and remarkable stability (more than 20 cycles) via a circulating flow-through process. Unlike the conventional batch-type reactor, experiments and computational fluid dynamics simulations demonstrate that the optimal utilization of the 3D active area under the flow-through mode, initiated by the convection-enhanced mass/charge transfer for Fe 2+ reduction and then strengthened by MoS 2 -induced flow rotation for sufficient reactant mixing, is crucial for oxidant activation and subsequent ROS generation. Strikingly, the flow-through co-catalytic system with superwetting capabilities can even tackle the intricate oily wastewater stabilized by different surfactants without the loss of pollutant degradation efficiency. Our findings highlight an innovative co-catalyst system design to expand the applicability of AOPs based technology, especially in large-scale complex wastewater treatment.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Jia Zhao,Heng Zhang,Yang Shi,Mengfan Luo,Hongyu Zhou,Zhenjun Xie,Ye Du,Peng Zhou,Chuanshu He,Gang Yao,Bo Lai
Ferrate (Fe(VI)) has aroused great research interest in recent years due to its environmental benignancy and lower potential in disinfection by-product generation. However, the inevitable self-decomposition and lower reactivity under alkaline conditions severely restrict the utilization and decontamination efficiency of Fe(VI). Here, we discovered that Ru(III), a representative transition metal, could effectively activate Fe(VI) to degrade organic micropollutants, and its performance on Fe(VI) activation exceeded that of previously reported metal activators. The high-valent metal species (i.e., Fe(IV)/Fe(V) and high-valent Ru species) made a major contribution to SMX removal by Fe(VI)−Ru(III). Density functional theory calculations indicated the function of Ru(III) as a two-electron reductant, leading to the production of Ru(V) and Fe(IV) as the predominant active species. The characterization analyses proved that Ru species was deposited on ferric (hydr)oxides as Ru(III), indicating the possibility of Ru(III) as an electron shuttle with the rapid valence circulation between Ru(V) and Ru(III). This study not only develops an efficient way to activate Fe(VI) but also offers a thorough understanding of Fe(VI) activation induced by transition metals.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Kexin Yin,Yanan Shang,Dongdong Chen,Baoyu Gao,Qinyan Yue,Xing Xu
Versatile persulfate-based catalytic mechanisms induced by highly-effective single atom catalysts (SACs) have been intensively reported, which was mainly ascribed to the versatile coordinated-structures of SACs. However, the origin of these different mechanisms from the specific properties of pollutants has been ignored. In this work, eight kinds of pollutants were selected and the half-wave potential (φ 1/2 ) values representing their redox potentials were determined. A good correlation between the redox potential characteristics of pollutants and their oxidation performances/pathways in manganese single-atom catalyst (Mn-SAC)/PMS system can be confirmed. The φ 1/2 values of different pollutants showed a good correlation with the energy gaps between the pollutants and Mn-SAC/PMS complexes as well as their electrophilicity indexes, which confirmed the redox potential of pollutants was essential to the electron-transfer oxidation in Mn-SAC/PMS system. Based on the new insights in this work, we will be able to unveil the sources of Fenton-like systems with tunable oxidation processes.
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ENVIRONMENTAL TOXICOLOGY
·
2023
·
IF 4.5
Weiqi Cui,Hui Zhou,Jingxian Zhang,Junwei Zhang,Deqiao Wu,Ying Rong,Fanglin Liu,Junhui Liu,Haiyan Liu,Bo Wei,Youcai Tang,Xinglin Liao,Xia Xu
The environmental pollutant bisphenol A (BPA), used in the manufacture of plastic packaging materials for various diets, is widely distributed in the environment and causes severe hepatotoxicity by inducing oxidative stress. Artemisia argyi essential oil (AAEO), a volatile oil component isolated from Artemisia argyi H.Lév . & Vaniot , has pharmacological effects, especially for hepatoprotective actions. However, the potential effect of AAEO in BPA induced hepatotoxicity has not been characterized. First, we analyzed the chemical composition in AAEO by gas chromatography–mass spectrometry. Herein, we investigated the effect of AAEO on hepatic metabolic changes in mice exposed to BPA. Results showed that compared with the BPA group, AAEO could reduce the level of liver function enzymes in BPA mice serum, and ameliorate hepatic lesions and fibrosis. Additionally, 20 differential metabolites screened by metabolomics were mainly involved in the reprogramming of glutathione metabolism, purine metabolism, and polyunsaturated fatty acid synthesis. Moreover, AAEO could reduce hepatic ferroptosis induced by BPA, as demonstrated by reducing xanthine oxidase activity, up-regulating the activities of glutathione peroxidase 4 (GPX4), superoxide dismutase, and catalase and the expression of SLC7A11 to promote the glutathione synthetic, while inhibiting transferrin receptor 1 (TFR1) expression to reduce the accumulation of Fe 2+ in cells. Therefore, our study identified AAEO as a hepatic protectant against BPA-induced hepatotoxicity by reversing the occurrence of ferroptosis.
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MATERIALS LETTERS
·
2023
·
IF 3
Xiaobao Li,Wenxia Xia,Liming Shen,Weiming Tan,Xinliang Luo
To improve the mechanical properties of epoxy resin (EP), cellulose nanoparticles (CNP)/EP composites were prepared using an in-situ reaction method. Fourier-transform infrared spectroscopy analysis showed that cellulose nanocrystalline (CNC) decomposed into CNP in the reaction, and grafted with epoxy resin E44. Environmental scanning electron microscope analysis showed that the CNP had good interfacial compatibility and dispersion in the EP. TEM analysis showed that the CNC decomposed into CNP during the process of copolymerization with epoxy resin E44, and the size of the CNP was around 50–100 nm. With the addition of 0.3 wt% CNC, the tensile strength of the CNP/EP composite film increased by 24%, the tensile modulus increased by 26%, the elongation at break increased by 61%, and tensile toughness increased by 101%. Therefore, in this work, we presented a novel cellulose nanoparticle to simultaneously strengthen and toughen epoxy resin.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jialu Pan,Lin Che,Tong Wei,Yanqing Cong,Shi-Wen Lv
It is of great significance to rationally regulate the activation mechanism of peroxymonosulfate for wastewater treatment. Herein, for the first time, a newly-constructed NiCo 2 O 4 @ZIF-67 core–shell nanocage was employed as a mediator for effective removal of tetracycline (TC). As-prepared NiCo 2 O 4 @ZIF-67 displayed reduced charge transfer resistance and enhanced electron transfer rate. Importantly, more than 99.58% of TC can be degraded within 30 min by developed NiCo 2 O 4 @ZIF-67/PMS system, and the removal efficiency of TOC was as high as 72.81%. Moreover, antimicrobial tests revealed the low toxicity or non-toxic of degradation products. More interestingly, after coating ZIF-67 film on the surface of NiCo 2 O 4 , the electron transfer process among PMS, contaminant and catalyst was enhanced. The radical and nonradical pathways worked in coordination each other and achieved the rapid removal of various organic pollutants. The ZIF-67-derived NiCo 2 O 4 core dominated the generation of reactive oxygen species, while the coated ZIF-67 shell induced the electron transfer from TC to PMS. Besides, the introduction of ZIF-67 not only improved the anti-interference for inorganic anions, but also boosted the water stability, thereby resulting in that NiCo 2 O 4 @ZIF-67 still remained great catalytic performance after repeated use for several times. In short, current work shared a promising approach for wastewater treatment.
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ChemistrySelect
·
2023
·Vol. 8
·期 26
·e202300747
·
IF 2.1
Shasha Yu
Graphical A new kind of antioxidant RSSPDs were prepared through combining phenol, diphenylamine and sulfide in one molecule with CH 2 NH. They exhibited quite high antioxidative activity at elevated temperature. The multiple intramolecular synergisms between primary antioxidants and secondary antioxidants can be considered as the main reasons for their high antioxidative activity. A new type of multifunctional antioxidant RSSPD was designed through combining four different antioxidant fragments. Pressure differential scanning calorimetry (PDSC) tests show that RSSPD has outstanding antioxidative activity especially at high temperature compared with both the traditional antioxidants and our reported antioxidant SSPD. From the comparison with different related formulations and the density functional theory (DFT) calculations, a complicated intramolecular synergism mechanism is proposed. The intramolecular synergism between different primary antioxidants and the intramolecular synergism between primary antioxidants and secondary antioxidants can be considered as the main reasons for the high antioxidative activity of RSSPD.
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BIOSENSORS & BIOELECTRONICS
·
2023
·
IF 12.6
Yu-Huan Liu,Chang Liu,Xin-Hui Wang,Tong Li,Xing Zhang
Bisphenol A (BPA) is an endocrine disrupting chemical and broadly used in plastics. The leakage of BPA in food and water cycles poses a significant risk to the environment and human health. Thus, monitoring the concentration of BPA to avoid its potential risk is highly important. In this work, a simple and efficient oxygen deficient molecularly imprinted TiO 2 electrochemical sensor was proposed for the detection of BPA. The introduction both oxygen vacancies and molecular imprinting evidently enhanced the electrochemical oxidation signal of BPA. The sensor had a good linear response ranging from 0.01 μM to 20 μM with a limit of detection of 3.6 nM. Additionally, the sensor showed remarkable stability, reproducibility and interference resistant ability. It also exhibits excellent recovery during the detection of real water. These findings suggested that the sensor has the potential to be developed as a simple, efficient and low-cost monitoring system for the monitoring of BPA in water.
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 7
·1-17
·
IF 2.9
Xiao Sihua,Wan Jinquan,Wang Yan,Yan Zhicheng,Ma Yongwen,Sun Jian,Tang Min,Cao Jianye,Chen Jinxin
The large-scale wastewater treatment plants (WWTPs) in developed regions collect volumes of wastewater containing various emerging contaminants (ECs) every day, but without any effective process to eliminate them. Therefore, it is of vital importance to study the occurrence of ECs in the effluents from WWTPs. In this study, the concentration levels and pollution characteristics of typical ECs in effluents were investigated for source identification and risk assessment. In total, 13 of 39 analyzed ECs were detected in the effluents, with the highest detection concentration at 706 µg/L (oxolinic acid). Sulfaphenazole showed the highest detection frequency at 100%, while Liede WWTP (1.2 million m 3 /day), located at Tianhe District, was with the highest detection concentration (899 µg/L) among all sampling sites. Parallel factor analysis was applied to identify the dissolved organic matters (DOMs) of excitation–emission matrix spectroscopy (EEMS) first. Based on previous research data, the connection between DOMs and pollution sources could be built. Then, principal component analysis (PCA) and Pearson’s correlation analysis were used to determine the correlation between ECs and DOMs. Finally, ecological and health risk quotients were calculated for the risk assessment of ECs. The results illustrated that oxolinic acid, sulfaphenazole, sulfaquinoxaline, sulfadimethoxypyrimidine, penicillin V, and flumequine were potentially discharged from human activities and livestock, poultry, and aquaculture industry; the possible sources of sulfadoxine and nafcillin were agricultural activities, food production, and catering industry; sulfapyridine and erythromycin were believed to come from hospital wastewater; and the discharges of lincomycin, sulfameter, and sulfamerazine were related to petrochemical industry or chemical production activities. Except for sulfadoxine, all detected ECs posed a high or median risk on aquatic ecosystem, which is enough to threaten aquatic organisms. Even though only oxolinic acid, sulfaquinoxaline, and sulfadimethoxypyrimidine presented a potential risk on humans’ health, the cumulative effect of ECs in the human body still needs attention. The threats of ECs from large-scale WWTPs in China’s developed regions are pointed out for the first time, which could possibly bring widespread attention on emerging pollution from WWTP effluents, potentially advance the introduction of relevant policies, and provide the direction and target pollutants for follow-up mitigation actions.
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ACS ES&T Engineering
·
2023
·
IF 7.1
Kui Yang,Daoyuan Zu,Zhong Zhang,Jinxing Ma,Zhifeng Yang
A reactive electrochemical membrane (REM) has been identified as an excellent platform in micropolluted water purification due to its rapid mass transfer capability. Unlike traditional flow-by systems, the convection-enhanced REM systems activate the REM’s inner reaction sites, potentially imparting a spatially variable reactivity. Therefore, we explored the spatial scale of micropollutant oxidation in REM. Theoretical and experimental evidence demonstrated that an REM might feature nonuniform oxidation activity along its reaction depth (about hundreds of micrometers). That is, the zone generating •OH was located within a few micrometers beneath the REM surface, i.e., less than 1% of its reaction depth due to the rapid overpotential/potential drop in the REM. The nonuniform reactive character might render the REM of a strong direct electron transfer ability, enabling rapid removal of electron-rich micropollutants even at low potentials. However, unsatisfactory removal of electron-poor micropollutants has been observed, and a higher potential was required to prompt the generation of •OH. These results provide in-depth insight into the spatial scale of nonuniform oxidation of micropollutants in REM, contributing to the analysis of micropollutant oxidation mechanisms and the optimization of the design and operation of REM modules for cost-effective water purification.
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CHEMOSPHERE
·
2023
·
IF 8.8
Hao Li,Canyuan Lin,Ruhui Ma,Yuancai Chen
In this study, the selective adsorption of aromatic compounds on mesoporous MIL-53(Al) was investigated, and followed the order: Biphenyl (Biph) > Triclosan (TCS) > Bisphenol A (BPA) > Pyrogallol (Pyro) > Catechol (Cate) > Phenol (Phen), and exhibited high selectivity toward TCS in binary compounds. In addition to hydrophobicity and hydrogen bonding, π–π interaction/stacking predominated, and more evidently with double benzene rings. TCS-containing halogens could increase π interaction on the benzene rings via forming Cl–π stacking with MIL-53(Al). Moreover, site energy distribution confirmed that complementary adsorption mainly occurred in the Phen/TCS system, as evidenced by Δ Q pri (the decreased solid-phase TCS concentration of the primary adsorbate) < Q sec (the solid-phase concentrations of the competitor (Phen)) . In contrast , competitive sorption occurred in the BPA/TCS and Biph/TCS systems within 30 min due to Δ Q pri = Q sec , followed by substitution adsorption in the BPA/TCS system, but not for the Biph/TCS system, likely attributed to the magnitude of energy gaps (E g ) and bond energy of TCS (1.80 eV, 362 kJ/mol) fallen between BPA (1.74 eV, 332 kJ/mol) and Biph (1.99 eV, 518 kJ/mol) according to the density-functional theory of Gaussian models. Biph with a more stable electronic homeostasis than TCS lead to the occurrence of substitution adsorption in the TCS/BPA system, but not in the TCS/Biph system. This study provides insight into the mechanisms of different aromatic compounds on MIL-53(Al).
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