Journal of Environmental Management最新文献_第6页

A novel deep learning-based floating garbage detection approach and its effectiveness evaluation in environmentally sustainable development

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125154

Yuhai Zheng , Xizhi Nong , Lihua Chen , Di Long

Floating garbage removal is an essential environmental strategy to reduce water pollution and achieve environmental sustainability, and it is a pressing issue for global ecological restoration. Under the interference of complex environments, floating garbage will gather, overlap, and change its shape due to water flow and wind. Efficient and automatic detection and collection of floating garbage gathered on the water surface is a challenging environmental management task. This study proposed an efficient and economical deep learning solution based on YOLOv8 (You Only Look Once v8). By improving the backbone, introducing the Wise-Powerful IoU loss, and adding the AuxHead detection head, the negative impact of complex environmental factors was effectively compressed, and the detection mean Average Precision(mAP) of the surface model aggregated floating garbage was improved to 89.4 %. The Precision(P) was improved to 95.8 %. The model size is only 18.8 MB, and the number of model parameters is reduced by 32.2 % compared with the original model. The proposed model addresses the challenging issue of detecting aggregated floating garbage on the water surface, and the lightweight model is also more conducive to promoting outdoor use. The research results can improve the aggregated floating garbage collection rate by up to 61.5 % compared with the mainstream model Faster R-CNN. It can save up to about 1730.3 kW·h of electricity per ton of recycled waste oil and reduce the emission of 452.7 kg of CO₂ and 2328.8t of water pollution. The scheme is superior to the current technical level in terms of detection Precision and mean Average Precision and makes essential scientific contributions to the protection and restoration of water ecosystems, energy conservation, emission reduction, and carbon reduction.

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引用次数: 0

Exploring the function of key species in different composting stages for effective waste biotransformation

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125234

Shang Ding , Jialin Zhong , Shuwen Du , Xiaofan Liu , Aiping Yao , Xinhua Xu , Donglei Wu

Composting is a microbial-driven process that plays a vital role in recycling waste and promoting sustainable production. To develop more effective bioaugmentation strategies, this study examined three successive stages in an aerobic composting system, focusing on microbial community adaptation to high-temperature stress (mode_2) and nutrient-poor conditions (mode_3). The results revealed a shift from an r-strategy (rapid growth) to a K-strategy (thriving under resource-limited conditions). Community succession was predominantly driven by deterministic processes (>90 %) and exhibited strong cooperative interactions. Using multiple statistical approaches, key species were identified for each condition. These species enhanced microbial network connectivity under environmental stresses, increasing network edges by 29 %–35 %. Under high-temperature stress, Bacillus and Ureibacillus maintained core functions, while Chelativorans and Aeribacillus contributed to key metabolic pathways, including amino acid metabolism. In nutrient-poor conditions, Saccharomonospora and Pseudoxanthomonas enhanced overall system functionality, and Novibacillus played a key role in carbon and nitrogen cycling, particularly nitrogen fixation. Predictive models for microbial community stability (R² = 0.68–0.97) were developed based on these key species to enable rapid assessment of system stability. Overall, this study identifies essential microbes involved in composting across different environmental conditions and clarifies their functional roles, providing valuable insights for optimizing aerobic composting efficiency and advancing waste resource management.

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引用次数: 0

Spatio-temporal dynamics variation of dissolved organic matter and water quality parameters in Giheung Reservoir: A vertical perspective

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125214

Ziyu Lin , Hye-Ji Oh , Kwang-Hyeon Chang , Juin Yau Lim , Jong-Min Oh

Water reservoirs in densely populated areas play a crucial role in water supply, irrigation, and flood regulation. This study investigated the spatiotemporal dynamics of dissolved organic matter (DOM) and its interactions with water quality parameters in Giheung Reservoir, South Korea. Monthly water samples were collected at three depths, measuring fifteen physicochemical properties alongside DOM characterization using Excitation-Emission Matrix Parallel Factor Analysis (EEM-PARAFAC), identifying four DOM components: C1 (microbial protein-like), C2 (humic-like), C3 (terrestrial humic-like), and C4 (tyrosine/tryptophan-like). Seasonal stratification influenced DOM distribution, with humic-like DOM (C2, C3) accumulating in deeper layers during summer, while protein-like DOM (C1, C4) dominated surface waters due to enhanced biological productivity, and mixing periods homogenizing DOM across depths. The dimictic thermal regime, with moderate summer stratification and full mixing in spring and autumn, governed these patterns. 2D correlation spectroscopy (2D-COS) identified sequential DOM variation across layers, with humic-like DOM increasing at depth during stratification. Fluorescence indices—Fluorescence Index (FI), Humification Index (HIX), and Biological Index (BIX)—were integrated into structural equation modeling (SEM), showing that temperature and dissolved oxygen strongly drive protein-like DOM, while nitrogen and phosphorus compounds shape DOM reactivity. These findings enhance understanding of DOM biogeochemical processes and provide valuable insights for reservoir management to maintain water quality.

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引用次数: 0

Waste reutilization: Carbon foam–red mud composites with photothermal effects for wastewater purification in outdoor environments

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125200

Shangqing Zhang , Jing Cui , Zhijie Li , Hucheng Huang , Wenkai Zhang , Zhiqiang Wang , Fenghua Zhao , Shaohui Guo

The problems associated with the lack of clean fresh water are well-known and expected to worsen in the coming decades owing to water scarcity, which is a global occurrence even in regions currently considered water-rich. Addressing these problems calls for a tremendous amount of research to be conducted to identify robust methods for purifying water at a lower cost and with less energy, while simultaneously minimizing the use of chemicals and their impact on the environment. Herein, we prepared photothermal/photodegradation materials based on carbon foam and red mud for use in wastewater purification on basis of waste reutilization. Owing to the coupling of the photothermal effect, adsorption properties, and photodegradation performance of these materials, wastewater samples containing various organic substances (RhB and MB solutions) and industrial heavy ions were effectively purified. We designed a practical device based on these materials for use in water purification in outdoor environments under natural sunlight. The device demonstrated satisfactory purification performance, indicating its potential practicability.

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引用次数: 0

Growing status rather than temperature was more associated with phytoplankton stoichiometry

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125175

Yang Yang , Qinglan Chen , Jingyun Pan , Yingliang Liu , Naselli-Flores Luigi

Phytoplankton growth is regulated primarily by temperature and nutrient availability. Due to the increasing trend of global warming and eutrophication, it is important to unravel the responses of phytoplankton to varying temperatures and nutrients. This study investigated the interactive effects of temperature (15 °C vs 25 °C) and nitrogen/phosphorus availability (N/P ratios: 13–77) on phytoplankton stoichiometry and community assembly in subtropical reservoir communities. We assumed that (1) Temperature effect on stoichiometry would intensify under nutrient limitation due to altered metabolic demands. Phosphorus limitation would dominate at higher temperatures through growth rate-mediated utilization; (2) Stoichiometric homeostasis would primarily reflect growth phase rather than thermal regime. Results demonstrated that temperature-nutrient interactions shape cellular stoichiometry through growth dynamics. Biomass increased with warming and nutrient enrichment, particularly under P-repleted conditions. Alkaline phosphatase, acting as a strategy for P-limitation, showed temperature-dependent, phase-specific patterns. Cellular elemental contents exhibited greater thermal sensitivity during the exponential growth, aligning with ribosomal investment demands. The homeostasis of phytoplankton was growth-phase dependent, with stationary-phase communities showing plasticity at 25 °C and stability at 15 °C. Temperature affected the stoichiometry indirectly by adjusting the growth rate and metabolism which changes the nutrient demand and resource allocation within cells. Cyanobacteria dominated warmer treatments through enhanced P-use efficiency. This study highlighted temperature-mediated shifts in nutrient limitation thresholds and homeostasis strategies, which provides evidences for predicting bloom dynamic under eutrophication and climate change in this region.

浮游植物的生长主要受温度和养分供应的调节。由于全球变暖和富营养化的趋势日益加剧，了解浮游植物对不同温度和养分的反应非常重要。本研究调查了温度（15 °C与25 °C）和氮磷供应量（氮磷比：13-77）对亚热带水库群落浮游植物化学计量和群落组合的交互影响。我们假定：(1) 由于新陈代谢需求的改变，温度对化学计量的影响会在营养限制条件下加剧。在较高温度下，磷的限制将通过生长速率介导的利用而占主导地位；（2）化学计量平衡主要反映生长阶段而非温度制度。研究结果表明，温度与养分的相互作用通过生长动态影响细胞的化学计量。生物量随着温度升高和养分富集而增加，尤其是在钾贫乏的条件下。碱性磷酸酶作为一种限制 P 的策略，表现出与温度相关的特定阶段模式。细胞元素含量在指数生长期间表现出更高的热敏感性，这与核糖体投资需求一致。浮游植物的平衡与生长阶段有关，静止期群落在 25 °C 时表现出可塑性，而在 15 °C 时则表现出稳定性。温度通过调整生长率和新陈代谢间接影响了化学计量，从而改变了细胞内的营养需求和资源分配。蓝藻通过提高钾的利用效率，在温度较高的处理中占主导地位。这项研究强调了温度介导的营养限制阈值和平衡策略的变化，为预测该地区富营养化和气候变化下的水华动态提供了证据。

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引用次数: 0

Cleaner production of performance-enhanced hybrid composites using agro-industrial wastes: A sustainable waste management strategy

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125116

B. Prabhu , M. Prakash , N. Ramasamy , Viswanathan Kanagasabai , T. Mohanraj , D. Vijay , T. Arunkumar

Extensive research on developing sustainable hybrid composites using special waste streams as alternative conventional ceramic oxide reinforcements for effective solid waste management is envisioned. This study examines physical and mechanical characteristics of aluminium hybrid composites (AHC) via waste management strategy of reducing, recycling and reusing the bio-mass wastes; Coconut shell ash (CA) and Red mud (RD) at their total concentration of 2, 4 and 6 wt % as reinforcements. The particle size and its elements of the reinforcements are examined by particle size analyzer (PSA) and X-ray fluorescence (XRF) analysis. The composites are produced via the bottom pouring stir casting process. The composites’ morphology, composition, crystallinity via FESEM/EDAX, FT-IR, and XRD studies, mechanical (tensile, compressive strength, micro-hardness and impact energy) and physical (density and porosity) properties are analyzed to assess functionality. Characterization studies confirm the reinforced composites surpass the base aluminium alloy in physical and mechanical properties. Specifically, the composite with 6 wt % (CA + RD) has the potential to improve the base aluminium alloy in terms of density (2.61 g/cc), hardness (100.14 VH), impact energy (2.30 J), tensile (161.09 MPa), and compressive strength (226.05 MPa). Statistical analysis validates the experimental data, confirming the reinforcements as suitable alternatives to ceramic oxides for enhancing metal composites. The LCA results indicate energy consumption (293.12 MJ/kg) and CO₂ emissions (25.11 kg CO₂/kg), emphasizing the need for clean energy adoption and advanced raw material extraction to develop sustainable composites aligned with SDGs 9 and 12 in the construction and energy sectors.

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引用次数: 0

Soil nutrients determine multidimensional absorptive root traits of Cryptomeria japonica var. sinensis plantations along a chronosequence in subtropical forest

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125220

Chunran Liu , Lihua Wang , Jing Li , Petr Heděnec , Zhenfeng Xu , Bo Tan , Xinglei Cui , Han Li , Lin Xu , Hongwei Xu , Li Zhang , Lixia Wang , Sining Liu , Yanhong Gong , Yaling Yuan , Chengming You

Absorptive roots are crucial for nutrient uptake and water absorption in forest ecosystems, yet variations in root traits and the underlying drivers during stand succession remains poorly understood. Here, we use a space-for-time substitution method to investigate the morphological traits (i.e., root diameter, RD; specific root length, SRL; and root tissue density, RTD) and chemical traits (i.e., concentrations of carbon, C; nitrogen, N; phosphorus, P; potassium, K; calcium, Ca; magnesium, Mg and manganese, Mn) in the absorptive roots of Cryptomeria japonica across five chronosequences in subtropical China. Simultaneously, we evaluated soil parameters and tree relative growth rate (RGR) to determine their influence on root traits. The results showed that RD, N, K, and Ca concentrations exhibited hump-shaped patterns with stand development (peaking in mature stands), whereas SRL and RTD exhibited opposite trends. Additionally, P and Mg concentrations in the roots decreased with stand age, whereas Mn concentration increased. Two trade-off strategies of absorptive root traits were identified: the first strategy characterized by RD, RTD, and root nutrients (N, Ca and Mg), potentially indicates a trade-off between nutrient acquisition and conservation. The second strategy related to SRL and K concentration represents a trade-off between resource foraging efficiency and nutrient allocation. Soil factors had a greater influence on root trait variations than tree RGR. Specifically, soil pH negatively influenced RD and Mn concentration but positively affected RTD. Root N and Ca concentrations increased with soil water content, while K concentration rose with soil nitrate-N availability. Conversely, P and Mg concentrations decreased with increasing soil ammonium-N. These findings demonstrate that forest stand development shapes adaptive adjustments in absorptive root traits through soil-mediated trade-offs between resource acquisition and conservation, highlighting edaphic factors as key regulators of nutrient foraging strategies.

{"title":"Soil nutrients determine multidimensional absorptive root traits of Cryptomeria japonica var. sinensis plantations along a chronosequence in subtropical forest","authors":"Chunran Liu , Lihua Wang , Jing Li , Petr Heděnec , Zhenfeng Xu , Bo Tan , Xinglei Cui , Han Li , Lin Xu , Hongwei Xu , Li Zhang , Lixia Wang , Sining Liu , Yanhong Gong , Yaling Yuan , Chengming You","doi":"10.1016/j.jenvman.2025.125220","DOIUrl":"10.1016/j.jenvman.2025.125220","url":null,"abstract":"<div><div>Absorptive roots are crucial for nutrient uptake and water absorption in forest ecosystems, yet variations in root traits and the underlying drivers during stand succession remains poorly understood. Here, we use a space-for-time substitution method to investigate the morphological traits (i.e., root diameter, RD; specific root length, SRL; and root tissue density, RTD) and chemical traits (i.e., concentrations of carbon, C; nitrogen, N; phosphorus, P; potassium, K; calcium, Ca; magnesium, Mg and manganese, Mn) in the absorptive roots of <em>Cryptomeria japonica</em> across five chronosequences in subtropical China. Simultaneously, we evaluated soil parameters and tree relative growth rate (RGR) to determine their influence on root traits. The results showed that RD, N, K, and Ca concentrations exhibited hump-shaped patterns with stand development (peaking in mature stands), whereas SRL and RTD exhibited opposite trends. Additionally, P and Mg concentrations in the roots decreased with stand age, whereas Mn concentration increased. Two trade-off strategies of absorptive root traits were identified: the first strategy characterized by RD, RTD, and root nutrients (N, Ca and Mg), potentially indicates a trade-off between nutrient acquisition and conservation. The second strategy related to SRL and K concentration represents a trade-off between resource foraging efficiency and nutrient allocation. Soil factors had a greater influence on root trait variations than tree RGR. Specifically, soil pH negatively influenced RD and Mn concentration but positively affected RTD. Root N and Ca concentrations increased with soil water content, while K concentration rose with soil nitrate-N availability. Conversely, P and Mg concentrations decreased with increasing soil ammonium-N. These findings demonstrate that forest stand development shapes adaptive adjustments in absorptive root traits through soil-mediated trade-offs between resource acquisition and conservation, highlighting edaphic factors as key regulators of nutrient foraging strategies.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125220"},"PeriodicalIF":8.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Planning conservation priority areas for marine mammals accounting for human impact, climate change and multidimensionality of biodiversity

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125193

Linjie Li , Yanli Tang , Hao Dong , Linlin Zhao , Changdong Liu

Because of the crucial ecological status of marine mammals, identifying priority areas for these species could significantly contribute to achieving the 30 % ocean protection target set by the Kunming-Montreal Global Biodiversity Framework. However, comprehensive conservation priorities requires considering multiple biodiversity dimensions and the impacts of climate change and human activities, which are poorly considered. In this study, we first investigated the distribution patterns of species, functional, and phylogenetic diversity of marine mammals and analyzed their relationship with cumulative anthropogenic impacts and climate change. We then developed conservation plans in which conservation targets of each species were allocated according to their distinctiveness indices, and protection costs were set as cumulative anthropogenic impacts and future climate velocity. The results indicate that incorporating extinction probability into the calculation of distinctiveness indices affects species uniqueness rankings, highlighting the need to consider species threat levels in future conservation efforts. Negative correlations were found for marine mammal diversity with cumulative anthropogenic impacts and climate change, implying that these factors may have already influenced the biodiversity distribution. The results suggest that existing MPAs are exposed to high levels of cumulative human impacts and climate velocity, necessitating further assessment of their effectiveness. In contrast, the low-regret MPAs identified in this study face significantly lower cumulative human impacts and future climate velocity, presenting valuable opportunities for marine mammal conservation.

{"title":"Planning conservation priority areas for marine mammals accounting for human impact, climate change and multidimensionality of biodiversity","authors":"Linjie Li , Yanli Tang , Hao Dong , Linlin Zhao , Changdong Liu","doi":"10.1016/j.jenvman.2025.125193","DOIUrl":"10.1016/j.jenvman.2025.125193","url":null,"abstract":"<div><div>Because of the crucial ecological status of marine mammals, identifying priority areas for these species could significantly contribute to achieving the 30 % ocean protection target set by the Kunming-Montreal Global Biodiversity Framework. However, comprehensive conservation priorities requires considering multiple biodiversity dimensions and the impacts of climate change and human activities, which are poorly considered. In this study, we first investigated the distribution patterns of species, functional, and phylogenetic diversity of marine mammals and analyzed their relationship with cumulative anthropogenic impacts and climate change. We then developed conservation plans in which conservation targets of each species were allocated according to their distinctiveness indices, and protection costs were set as cumulative anthropogenic impacts and future climate velocity. The results indicate that incorporating extinction probability into the calculation of distinctiveness indices affects species uniqueness rankings, highlighting the need to consider species threat levels in future conservation efforts. Negative correlations were found for marine mammal diversity with cumulative anthropogenic impacts and climate change, implying that these factors may have already influenced the biodiversity distribution. The results suggest that existing MPAs are exposed to high levels of cumulative human impacts and climate velocity, necessitating further assessment of their effectiveness. In contrast, the low-regret MPAs identified in this study face significantly lower cumulative human impacts and future climate velocity, presenting valuable opportunities for marine mammal conservation.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125193"},"PeriodicalIF":8.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Co-application of digestate and biochar reduced greenhouse gas emissions in paddy soil through enhanced denitrification and anaerobic methane oxidation

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125244

Dandan Gao , Hailin Tian , Hao Yang , Wenxia Tan , Xiaofeng Liang , Chunyu Wen , Dianyu Song , Yuman Zhang , Qian Tan

Digestate from food waste (FW) has been identified as a promising nutrient resource for agriculture. However, applying digestate directly to soil often produces considerable greenhouse gas (GHG) emissions. As a soil amendment, biochar has demonstrated potential for mitigating GHG emissions. At present, the effect of biochar on GHG emissions and the associated regulatory mechanisms in paddy soils amended with digestate remains unclear. A 45-day soil incubation was conducted with different nitrogen substitution ratios of urea by digestate, coupled with biochar application: CK (100 % urea), D₀U₁₀₀ (100 % urea + biochar), D₅₀U₅₀ (50 % urea, 50 % digestate + biochar), and D₁₀₀U₀ (100 % digestate + biochar). Results indicated that the co-application of biochar and digestate significantly reduced N₂O accumulation by 44.99 %–80.39 % compared to CK, primarily due to a decrease in soil NO₃⁻-N content and an increase in soil pH, which together significantly improved the distribution of the nosZ gene involved in denitrification. The increase in the abundance of Conexibacter, Symbiobacterium, Anaerolinea, and Candidatus_Solibacter further contributed to N₂O reduction. Furthermore, the co-application led to a 21.68 %–38.15 % reduction in CH₄ accumulation compared to CK. Biochar increased the abundance of methanotrophic bacteria, such as Methylococcaceae, Methyloligellaceae, and Methylomirabilaceae. Co-application increased the abundance of nitrate-reducing bacteria Symbiobacterium and Anaerolinea, thereafter facilitating nitrite-dependent anaerobic methane oxidation (AOM) dominated by Methylomirabilaceae. Additionally, sulfate-dependent and Iron(III)-dependent AOM likely further contributed to CH₄ reduction. Overall, this study proposed a low-carbon management strategy for FW digestate and GHG emissions mitigation of paddy soil.

{"title":"Co-application of digestate and biochar reduced greenhouse gas emissions in paddy soil through enhanced denitrification and anaerobic methane oxidation","authors":"Dandan Gao , Hailin Tian , Hao Yang , Wenxia Tan , Xiaofeng Liang , Chunyu Wen , Dianyu Song , Yuman Zhang , Qian Tan","doi":"10.1016/j.jenvman.2025.125244","DOIUrl":"10.1016/j.jenvman.2025.125244","url":null,"abstract":"<div><div>Digestate from food waste (FW) has been identified as a promising nutrient resource for agriculture. However, applying digestate directly to soil often produces considerable greenhouse gas (GHG) emissions. As a soil amendment, biochar has demonstrated potential for mitigating GHG emissions. At present, the effect of biochar on GHG emissions and the associated regulatory mechanisms in paddy soils amended with digestate remains unclear. A 45-day soil incubation was conducted with different nitrogen substitution ratios of urea by digestate, coupled with biochar application: CK (100 % urea), D<sub>0</sub>U<sub>100</sub> (100 % urea + biochar), D<sub>50</sub>U<sub>50</sub> (50 % urea, 50 % digestate + biochar), and D<sub>100</sub>U<sub>0</sub> (100 % digestate + biochar). Results indicated that the co-application of biochar and digestate significantly reduced N<sub>2</sub>O accumulation by 44.99 %–80.39 % compared to CK, primarily due to a decrease in soil NO<sub>3</sub><sup>−</sup>-N content and an increase in soil pH, which together significantly improved the distribution of the <em>nosZ</em> gene involved in denitrification. The increase in the abundance of <em>Conexibacter</em>, <em>Symbiobacterium</em>, <em>Anaerolinea</em>, and <em>Candidatus_Solibacter</em> further contributed to N<sub>2</sub>O reduction. Furthermore, the co-application led to a 21.68 %–38.15 % reduction in CH<sub>4</sub> accumulation compared to CK. Biochar increased the abundance of methanotrophic bacteria, such as <em>Methylococcaceae</em>, <em>Methyloligellaceae</em>, and <em>Methylomirabilaceae</em>. Co-application increased the abundance of nitrate-reducing bacteria <em>Symbiobacterium</em> and <em>Anaerolinea</em>, thereafter facilitating nitrite-dependent anaerobic methane oxidation (AOM) dominated by <em>Methylomirabilaceae</em>. Additionally, sulfate-dependent and Iron(III)-dependent AOM likely further contributed to CH<sub>4</sub> reduction. Overall, this study proposed a low-carbon management strategy for FW digestate and GHG emissions mitigation of paddy soil.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125244"},"PeriodicalIF":8.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Highly-efficient photocatalytic removal of methyl orange on CuO hierarchical hollow microspheres modified by ultrathin and porous g-C3N4 nanosheets

IF 8 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Journal of Environmental Management

Pub Date : 2025-04-05 DOI: 10.1016/j.jenvman.2025.125233

Qian Li , Pingan Zhang , Tianjie Hong , Feifei Tao

Photocatalytic degradation technology is taken as an efficient strategy to alleviate organic dye pollution in wastewater. In order to achieve high catalytic activities, morphology regulation and structure design are crucial for photocatalytic system. In this work, the hierarchical CuO hollow microspheres self-assembled by nanowires (CuO HMS) were successfully synthesized by solvothermal process. Graphitic carbon nitride (g-C₃N₄) nanosheets (CNN) with ultrathin and porous feature were anchored on the spherical shell of CuO HMS to manufacture the CuO/g-C₃N₄ p-n heterojunction via one-step calcination. The unique CuO/g-C₃N₄ composite possesses the nanowire self-assembled hollow hierarchical microstructures, as well as the self-doped CuO by the C and/or N atoms, which conduces to increasing specific surface area, narrowing band gap, improving visible-light-harvesting capacity, promoting the segregation of photo-induced electron-hole pairs, and accelerating carrier movement. Therefore, CuO/g-C₃N₄ shows outstanding photocatalytic properties of methyl orange (MO) degradation, compared with CuO HMS and CNN. Especially, the CuO/g-C₃N₄ composite with 10 wt% CuO HMS (CC-3) achieves almost complete decomposition of MO, and its apparent rate constant (k_app) is superior to that of CuO HMS (19.1 times) and CNN (22.5 times). Compared with the similar materials such as CuO/BiVO₄, CuO/TiO₂ and CuO/ZnO p-n heterojunctions, the resulting CuO/g-C₃N₄ composite demonstrates the satisfactory photocatalytic performance. The close cooperation of unique hollow hierarchical morphology, C and/or N self-doping, and p-n heterojunction is proposed to account for the extraordinary photocatalytic MO decomposition. This work proposes a feasible and effective paradigm for the construction of CuO/g-C₃N₄ composite, which demonstrates excellent photocatalytic performance for pollutant removal in wastewater by establishing hollow structure, non-metallic self-doping and p-n junction.

{"title":"Highly-efficient photocatalytic removal of methyl orange on CuO hierarchical hollow microspheres modified by ultrathin and porous g-C3N4 nanosheets","authors":"Qian Li , Pingan Zhang , Tianjie Hong , Feifei Tao","doi":"10.1016/j.jenvman.2025.125233","DOIUrl":"10.1016/j.jenvman.2025.125233","url":null,"abstract":"<div><div>Photocatalytic degradation technology is taken as an efficient strategy to alleviate organic dye pollution in wastewater. In order to achieve high catalytic activities, morphology regulation and structure design are crucial for photocatalytic system. In this work, the hierarchical CuO hollow microspheres self-assembled by nanowires (CuO HMS) were successfully synthesized by solvothermal process. Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) nanosheets (CNN) with ultrathin and porous feature were anchored on the spherical shell of CuO HMS to manufacture the CuO/g-C<sub>3</sub>N<sub>4</sub> p-n heterojunction via one-step calcination. The unique CuO/g-C<sub>3</sub>N<sub>4</sub> composite possesses the nanowire self-assembled hollow hierarchical microstructures, as well as the self-doped CuO by the C and/or N atoms, which conduces to increasing specific surface area, narrowing band gap, improving visible-light-harvesting capacity, promoting the segregation of photo-induced electron-hole pairs, and accelerating carrier movement. Therefore, CuO/g-C<sub>3</sub>N<sub>4</sub> shows outstanding photocatalytic properties of methyl orange (MO) degradation, compared with CuO HMS and CNN. Especially, the CuO/g-C<sub>3</sub>N<sub>4</sub> composite with 10 wt% CuO HMS (CC-3) achieves almost complete decomposition of MO, and its apparent rate constant (<em>k</em><sub>app</sub>) is superior to that of CuO HMS (19.1 times) and CNN (22.5 times). Compared with the similar materials such as CuO/BiVO<sub>4</sub>, CuO/TiO<sub>2</sub> and CuO/ZnO p-n heterojunctions, the resulting CuO/g-C<sub>3</sub>N<sub>4</sub> composite demonstrates the satisfactory photocatalytic performance. The close cooperation of unique hollow hierarchical morphology, C and/or N self-doping, and p-n heterojunction is proposed to account for the extraordinary photocatalytic MO decomposition. This work proposes a feasible and effective paradigm for the construction of CuO/g-C<sub>3</sub>N<sub>4</sub> composite, which demonstrates excellent photocatalytic performance for pollutant removal in wastewater by establishing hollow structure, non-metallic self-doping and p-n junction.</div></div>","PeriodicalId":356,"journal":{"name":"Journal of Environmental Management","volume":"381 ","pages":"Article 125233"},"PeriodicalIF":8.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143776625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0