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Sodium alginate-mediated engineering of 3D-MnO2 architectures for efficient room-temperature formaldehyde catalytic decomposition

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Separation and Purification technology 2025年 370卷

作者： Cheng, Zeyi Lu, Jingling Zhang, Huiyu Liu, Fang Ran, Wang Xu, Wenxuan Yu, Tao Chen, Shouzhi Rong, Shaopeng Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China China Testing & Certification International Group Co. Ltd. Beijing100024 China Beijing Chehejia Automobile Technology Co. Ltd Beijing101399 China

Catalytic decomposition of formaldehyde at ambient temperature represents a promising technique for eliminating indoor formaldehyde pollution and improving indoor air quality. The employment of three-dimensional (3D) structured catalysts to facilitate this process is a topic worthy of investigation thanks to its rapid mass transfer and highly exposed active sites. Herein, two kinds of 3D-structured MnO2 were fabricated with the assistance of exogenous assembly force provided by sodium alginate (SA). In comparison to pure SA-assembled 3D catalyst and non-3D-structured MnO2 powder, 3D-MnO2 catalysts demonstrate unparalleled efficacy in HCHO elimination. Due to the porous 3D network with large spatial volume, 3D-MnO2 catalysts offer significant enhancements in mass transfer and the exposure of active sites, allowing for not only greater adsorption of HCHO, but also generation of additional active oxygen species to further oxidize HCHO. Surface –OH groups as the key factor affecting the catalytic activity at ambient temperature. The content and regeneration ability determine the performance of the catalyst at low temperature. 3D-δ-MnO2 demonstrates a distinctive capacity for the adsorption and activation of the water molecules, which further supplements the hydroxyl groups consumed in the decomposition of HCHO. This work proposes a simple method for the preparation of 3D catalysts and elucidates the underlying mechanisms responsible for their superior performance, thereby providing guidance for the development of indoor air purification materials. © 2025 Elsevier B.V.

关键词： Indoor air pollution

Mitogenomic phylogeny,biogeography,and cryptic divergence of the genus Silurus(Siluriformes:Siluridae)

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Zoological Research 2024年第4期45卷 711-723页

作者： Weitao Chen Nicolas Hubert Yuefei Li Shuli Zhu Jun Wang Denggao Xiang Shang Gao Chunni Kou Jilong Wang Tai Wang Zhiqiang Liang Junjie Wu Xinhui Li Jie Li Pearl River Fisheries Research Institute Chinese Academy of Fishery SciencesGuangzhouGuangdong 510380China China Key Laboratory of Aquatic Animal Immune Technology of Guangdong Province GuangzhouGuangdong 510380China Key Laboratory of Prevention and Control for Aquatic Invasive Alien Species Ministry of Agriculture and Rural AffairsGuangzhouGuangdong 510380China Scientific Observing and Experimental Station of National Fisheries Resources and Environment GuangzhouGuangdong 510380China Institut de Recherche pour le Développement MontpellierUMR 226 ISEM(UM-CNRS-IRD)France State Key Laboratory of Eco-hydraulic in Northwest Arid Region of China Xi’an University of TechnologyXi’anShaanxi 710048China Heilongjiang River Fisheries Research Institute Chinese Academy of Fishery SciencesHarbinHeilongjiang 150076China Gansu Fisheries Research Institute LanzhouGansu 730030China Hunan Fisheries Science Institute ChangshaHunan 410153China Yunnan Institute of Fishery Sciences Research KunmingYunnan 650111China

The genus Silurus,an important group of catfish,exhibits heterogeneous distribution in Eurasian freshwater *** group includes economically important and endangered species,thereby attracting considerable scientific *** this interest,the lack of a comprehensive phylogenetic framework impedes our understanding of the mechanisms underlying the extensive diversity found within this ***,we analyzed 89 newly sequenced and 20 previously published mitochondrial genomes(mitogenomes)from 13 morphological species to reconstruct the phylogenetic relationships,biogeographic history,and species diversity of *** phylogenetic reconstructions identified eight clades,supported by both maximum-likelihood and Bayesian ***-based species delimitation analyses yielded multiple molecular operational taxonomic units(MOTUs)in several taxa,including the Silurus asotus complex(four MOTUs)and Silurus microdorsalis(two MOTUs),suggesting that species diversity is underestimated in the genus.A reconstructed time-calibrated tree of Silurus species provided an age estimate of the most recent common ancestor of approximately 37.61 million years ago(Ma),with divergences among clades within the genus occurring between 11.56 Ma and 29.44 Ma,and divergences among MOTUs within species occurring between 3.71 Ma and 11.56 *** reconstructions suggested that the ancestral area for the genus likely encompassed China and the Korean Peninsula,with multiple inferred dispersal events to Europe and Central and Western Asia between 21.78 Ma and 26.67 Ma and to Japan between 2.51 Ma and 18.42 *** factors such as the Eocene-Oligocene extinction event,onset and intensification of the monsoon system,and glacial cycles associated with sea-level fluctuations have likely played significant roles in shaping the evolutionary history of the genus Silurus.

关键词： Maximum likelihood Bayesian inferences Ancestral area estimation Cryptic diversity Dispersal pathways Mitogenomes Sea levels

Lanthanum-Doped Mesoporous Magnetic Carbon Microspheres Derived from Camellia Oleifera Shell Biomass for Phosphate Removal from Industrial Wastewater

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SSRN 2024年

作者： Guo, Huiqin Lin, Jun'e Zhao, Zimiao Kang, Huayue Guo, Yongliang Peng, Tianhui Li, Kexin Yan, Liushui Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong University Nanchang330063 China National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource utilization Nanchang Hangkong University Nanchang330063 China College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control Hunan University Changsha410082 China

Lanthanum-based adsorbents have garnered considerable attention due to their superior phosphate removal property and environmental harmlessness. This study introduces a facile hydrothermal technique for the fabrication of two lanthanum-doped mesoporous magnetic carbon microspheres variants, named MCMSs-LaEX and MCMSs-LaIN, derived from Camellia oleifera shells. These microspheres were synthesized by modifying carbon microspheres (CMSs) with La(OH)3 and Fe3O4 to enhance their phosphate adsorption efficiency in wastewater treatment. The adsorption kinetics and isotherms were fitted well to the pseudo-second-order model and Freundlich model, respectively, indicating a multilayer chemisorption mechanism. The materials exhibited excellent adsorption capacity across a wide pH range of 2-7 and notable selectivity for phosphate ions amidst the presence of high concentrations of common competitive anions in water. Moreover, the MCMSs-LaIN preserved an adsorption efficiency of 90% even after undergoing four cycles of adsorption and desorption with diluted NaOH solution, attesting to its durability and potential for reuse. In-depth XRD, FT-IR and XPS characterization results revealed that the adsorption process is primarily driven by ligand exchange between phosphates and La(OH)3. Importantly, both MCMSs-LaEX and MCMSs-LaIN displayed exceptional effectiveness in removing phosphate from complex industrial wastewaters, such as those generated in phosphating and electrophoresis operations, underscoring their practical applicability in environmental remediation. © 2024, The Authors. All rights reserved.

关键词： Lanthanum compounds

Cu Inanchored Mno/Carbonaceous Frameworks Trigger Peroxymonosulfate Activation for Enrofloxacin Degradation: ROS Generation and Pollutant Attacking Processes

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SSRN 2024年

作者： Niu, Huai-Yuan Dong, Zheng-Tao Guo, Hai Yang, Ya-Ya Li, Jin-Cheng Yan, Ming Li, Ji-Shan Niu, Cheng-Gang Yang, Wen-Jie State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha410082 China College of Environmental Science and Engineering Key Laboratory of Environmental Biology and Pollution Control Ministry of Education Hunan University Changsha410082 China School of Resources and Environment Hunan University of Technology and Business Changsha410205 China Hunan University China

Despite Fluoroquinolone antibiotics (FQs) removal in peroxymonosulfate (PMS) activation have been widely researched and the outstanding degradation performance have been gained, the detailed processes by which reactive oxygen species attack pollutants have not been adequately studied. In this study, a Cu/MnO catalyst, denoted as 4CuMn/C-800, is anchored onto carbonaceous frameworks derived from biomass sources using a one-step calcination method for investigation. Benefiting from the sp2 unsaturated carbon as well as the synergistic effect between Cu2+/Cu+/Cu and Mn3+/Mn2+ bimetallic redox electron pairs, the prepared 4CuMn/C-800 material possesses excellent enrofloxacin (ENR) removal performance, where 85.5% of ENR is degraded in 80 min, and maintains relatively high catalysis performance even in the various reaction conditions (reaction pH, reaction temperature, existing anions etc.). The analysis reveals the 1O2 and •O2-, as the dominate ROS, continuously attack the specific active sites of ENR molecules until they are mineralized. In detail, the generated •O2- mainly attacks the piperazine ring, while the formed 1O2 assaults the quinolone group of ENR. By combining density functional theory (DFT) calculations with LC-MS analysis, we propose four distinct pathways for ENR degradation in the 4CuMn/C-800/PMS system. In summary, this study offers a novel and practical approach to design metal/metal oxide/carbon catalysts and enhances our understanding of the mechanisms behind ROS-driven PMS activation. © 2024, The Authors. All rights reserved.

关键词： Manganese oxide

Core-Shell Structured Bi2S3-ZnS@C Derived from ZIF-8 for Efficient Capture and Reliable Storage of Volatile Radioactive Iodine

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SSRN 2023年

作者： Chen, Kai-Wei Gu, Ao-Tian Zhou, Xin-Yu Wang, Peng Gong, Chun-Hui Mao, Ping Jiao, Yan Chen, Kai Yang, Yi Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province Faculty of Chemical Engineering Huaiyin Institute of Technology Huaian223003 China Nanjing University of Information Science & Technology Nanjing210044 China

Effective capture of radioiodine is crucial for the sustainable development of nuclear power, given its environmental mobility, high toxicity, and long half-life. Herein, a new core-shell structured Bi2S3-ZnS@C derived from ZIF-8 was synthesized by cation exchange, sulfation and carbonization. The advantage of this structure is that Bi2S3 uniformly loads on the surface of nanoparticles, effectively avoiding its aggregation and improving the utilization of active sites. The iodine capture experiments indicated that Bi2S3-ZnS@C had excellent adsorption capacity (up to 1118.5 mg g-1 within 120 min) and high chemisorption percentage (87.3%) at 200 ℃, as well as superior thermal and irradiation stability. The mechanism investigations revealed that the exceptional iodine uptake performance was predominantly attributed to the strong chemical reaction between Bi2S3 and I2 to generate BiI3. Additionally, the iodine-captured Bi2S3-ZnS@C could be immobilized in a commercial glass composition via low-temperature sintering. The findings indicated that the captured BiI3 and I2 were efficiently converted to the chemically stable BixOyI during the sintering process. The initial leaching rate of iodine was 3.94x10-5 g m-2 d-1, which signified the excellent chemical durability of the resultant glass composites. Therefore, the obtained Bi2S3-ZnS@C could be a promising candidate for efficient capture and stable storage of radioiodine. © 2023, The Authors. All rights reserved.

关键词： Bismuth compounds

The long-term effectiveness of ferromanganese biochar in soil Cd stabilization and reduction of Cd bioaccumulation in rice

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Biochar 2021年第4期3卷 499-509页

作者： Yuling Liu Haiyan Luo Boqing Tie Danyang Li Shoutao Liu Ming Lei Huihui Du Hunan Engineering&Technology Research Center for Irrigation Water Purification College of Resources and EnvironmentHunan Agricultural UniversityChangsha 410128People’s Republic of China Key Laboratory of Southern Farmland Pollution Prevention and Control Ministry of AgricultureChangsha 410128China Hunan Institute of Agro-Environment and Ecology Changsha 410128China

The application of Fe-Mn-modified biochar for the remediation of Cd-contaminated soil over long time periods has been little *** this paper,we describe the performance of coconut-shell-derived biochar modified with ferromanganese in relation to soil Cd stabilization and rice Cd bioaccumulation during a 3-year laboratory *** application dosages(0.05-0.5 wt%)and different rice varieties(the early and late rice)are also *** results show that ferromanganese is mainly loaded in biochar pores as MnFe_(2)O_(4),and that it decreases the specific surface area(SSA)and total pore volume of *** biochar(0.5 wt%)applied to paddy soil is more effective than the same dose of pristine biochar in decreasing the soil-exchangeable Cd fraction(27.42-41.92%vs 22.56-33.85%),predominantly by decreasing soil Eh and increasing root Fe *** biochar application helps to reduce Cd bioaccumulation in rice,especially in the grain(up to 48.6%-61.0%),and grain Cd levels(0.2 mg/kg)are all within the acceptable limit for food security in *** is shown that ferromanganese modification and application can maintain soil at low redox status,keep root Fe plaques at a high level,and may also increase the stability of pristine *** of these effects contribute to maintaining its high remediation efficiency over a 3-year inoculation *** results presented in this paper demonstrate the potential appli-cations of ferromanganese biochar in soil remediation and the improvement of food safety.

关键词： Biochar Ferromanganese Modification Cadmium Stabilization

Surface acidic sites strengthened core-shell HC@MnO2 for enhanced gaseous ammonia adsorption

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Chemosphere 2023年第1期338卷

作者： He, Weijiang Lu, Jingling Zhang, Nan Zhou, Yu Ding, Danni Feng, Yanfang Rong, Shaopeng Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Key Laboratory of Agro-Environment in Downstream of Yangtze Plain Ministry of Agriculture and Rural Affairs Institute of Agricultural Resources and Environment Jiangsu Academy of Agricultural Sciences Nanjing210014 China

As a common gaseous pollutant in atmospheric environment, ammonia (NH3) not only contributes to the formation of haze, but also disturb the nitrogen balance in ecosystem through atmospheric nitrogen deposition. Therefore, the control of NH3 emission has important environmental significance. Adsorption is the most commonly used technology for NH3 purification in practice, and efficient adsorbents are the key to adsorption method. Herein, a core-shell structured HC@MnO2 adsorbent was constructed by in-situ growth of layered δ-MnO2 on hydrochar (HC) surface, and its surface acidic sites were further strengthened. The enhancement of surface acidic sites significantly improved the adsorption performance of HC@MnO2 for NH3, reaching 34.49 mg NH3/g, which was superior to commercial carbon-based materials (whose adsorption capacity was 8.47 times that of Coal-based activated carbon, 14.25 times that of Coconut shell activated carbon, and 12.77 times that of Bamboo charcoal). Moreover, the operating parameters and adsorption kinetics were detailly investigated. The adsorption of HC@MnO2 on NH3 was in accordance with pseudo-second-order adsorption kinetics model. Large surface area of core-shell structure and abundant surface acidic sites of δ-MnO2 are the decisive reasons for the excellent adsorption performance of HC@MnO2. Importantly, the enhancement of surface stronger Brønsted acidic sites is the key to improve NH3 adsorption performance of HC@MnO2. Finally, the thermal regeneration and recycling performance of HC@MnO2–H were also investigated. This study provides a suggestive for further research on low-cost composite materials with excellent NH3 adsorption performance. © 2023 Elsevier Ltd

关键词： Manganese oxide

Elucidating the Binding Mechanism between Bovine Serum Albumin and Tio2 Nanoparticles with Diverse Properties: Insights from Spectroscopic Methods and Molecular Docking Simulation

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SSRN 2023年

作者： Zhang, Tingting Chen, Haoming Tan, Chunhu Li, Luo Liu, Chang Li, Weihua Yan, Changqing Li, Jiansheng Lu, Rui Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Information Materials and Intelligent Sensing Laboratory of Anhui Province Anhui University Hefei230601 China School of Environment and Energy Engineering Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse Anhui Jianzhu University Hefei230601 China Hefei Gotion High-tech Power Energy Co. Ltd. Hefei230011 China

The interaction mechanism between bovine serum albumin (BSA) and titanium dioxide (TiO2) nanoparticles with different shapes, surface charge and hydrophobic properties was studied using multiple spectral methods and molecular docking simulation. UV-vis spectra showed that when BSA interacted with the four TiO2 NPs, the intensity of the absorption peak at 278 nm increased, indicating that the TiO2 nanoparticles and BSA formed a stable ground state complex. The results of fluorescence spectra showed that the binding capacities of four different types of TiO2 nanoparticles with BSA are as follows: spherical TiO2 (s-TiO2) > rod-shaped TiO2 (r-TiO2) > positively charged TiO2 (c-TiO2) > hydrophobic TiO2 (h-TiO2). The results of synchronous fluorescence, circular dichroism (CD) and Fourier transform infrared (FTIR) spectroscopy revealed that s-TiO2, r-TiO2, and c-TiO2 have a weak effect on the conformation of BSA, whereas h-TiO2 has a greater effect. After adding 32 and 64 µg/mL TiO2, CD results showed that c-TiO2 increased the ɑ-helix content of BSA from 56.08% to 56.19% and 57.27%, respectively. h-TiO2 increased the ɑ-helix content of BSA to 60.46% and 62%. The FTIR results were consistent with CD. After the addition of TiO2 NPs, c-TiO2 and h-TiO2 increased the ɑ-helix content of BSA from 64.22% to 69.89% and 77.18%, respectively. Molecular docking results show that the bond energy between anatase TiO2 and BSA is -0.3 kJ/mol, and the bond energy between hydroxyl anatase TiO2 and BSA is -0.54 kJ/mol. The content of hydroxyl groups plays a key role in the binding capacity. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

Microbially-driven phosphorus cycling and its coupling mechanisms with nitrogen cycling in mangrove sediments

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Science of the Total Environment 2025年 958卷 178118页

作者： Liu, Fei Zeng, Jiaxiong Ding, Jijuan Wang, Cheng He, Zhili Liu, Zhiwei Shu, Longfei School of Life Sciences Jiaying University Meizhou514015 China Conservation and Utilization Laboratory of Mountain Characteristic Resources in Guangdong Province Meizhou514015 China School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology State Key Laboratory for Biocontrol Sun Yat-sen University Guangzhou510275 China Zhuhai509082 China

The phosphorus (P) cycle plays a crucial role in the biogeochemical cycling of mangrove sediments. However, the diversity of microbially-driven P-cycling and its coupling with nitrogen (N)-cycling remain poorly understood. In this study, we used metagenomic approaches to investigate microbial P-cycling and its potential interactions with N-cycling in mangrove sediments. Our results revealed that pH, total carbon, and total nitrogen were key environmental factors influencing the diversity of P-cycling microbial communities. Phosphorus metabolic pathways differed among mangrove sediment depths. In surface sediments (0–5 cm), microbial communities primarily acquired readily available inorganic phosphorus, whereas, in deeper sediments (>60 cm), they hydrolyzed more persistent triphosphates, reabsorbed nucleotides, and sourced free phosphate, reflecting a shift in phosphorus transport modes. We also identified glutamate metabolism as a potential pathway linking P-cycling with N-cycling, with these functions co-occurring in both contigs and genomes. Additionally, the diversity of microbial communities associated with the P-cycling increased with sediment depth, suggesting that microbially-driven P-cycling diversifies as depth increases. This study provides new insights into P-cycling and its potential coupling with N-cycling through glutamate metabolism, its coupling with N-cycling through glutamate metabolism. © 2024 Elsevier B.V.

关键词： Abiotic