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Synergistic effects in Mn-Co mixed oxide supported on cordierite honeycomb for catalytic deep oxidation of VOCs

Journal of environmental sciences 2022年第2期34卷 231-243页

作者： Hongyang Zhao Hui Wang Zhenping Qu Key Laboratory of Industrial Ecology and Environmental Engineering School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China

A series of Co-Mn mixed oxide catalyst supported on a cordierite monolith was facilely synthesized by ultrasonic *** catalytic performance was evaluated in the combustion of toluene,ethyl acetate and its *** was observed that with incorporating Mn into Co_(3)O_(4),the formation of solid solution with spinel structure could significantly improve the catalytic activity of pure phase Co_(3)O_(4).And the monolithic Co_(0.67)Mn_(0.33)O_(x) catalyst showed the best catalytic performance in the catalytic oxidation of toluene and ethyl acetate which could be completely oxidized at 220 and 180℃ respectively under the reaction velocity(WHSV)about 45,000 m L/(g·hr)and pollutant concentration of 500 ppm *** total conversion temperature of the VOCs mixture was at 230℃(500 ppm V toluene and 500 ppm V ethyl acetate)and determined by the temperature at which the most difficult molecule was *** excellent catalytic performance of monolithic Co_(0.67)Mn_(0.33)O_(x) was attributed to the higher content of Mn^(3+),Co^(3+),surface adsorbed oxygen and better redox *** prepared catalyst showed the good mechanical stability,reaction stability,and good adaptability to different reaction conditions.

关键词： Catalytic oxidation Cobalt Manganese Cordierite Monolithic catalyst

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Bibliometric analysis and scientific trends on perfluorinated and polyfluoroalkyl substances (PFASs) as an emerging pollutant

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Water-Energy Nexus 2024年第1期7卷 187-199页

作者： Guo, Hongan Xing, Meiyan Sun, Xiaojie Liu, Tao Key Laboratory of Yangtze Water Environment for Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology Guilin University of Technology Guilin541004 China

The persistence, bioaccumulation, and toxicity of perfluorinated and polyfluoroalkyl substances (PFASs), along with their concentrations in the environment and humans, have attracted global attention. However, so far, there have been seldom reports providing a systematical review in the entire field of PFASs research. Therefore, this study summarizes 14,112 relevant publications (2005–2022) and conducts bibliometric analysis using Vosviewer and CiteSpace. The findings offer insights into global PFASs research trends, assisting scientists in establishing their research directions. Unlike traditional literature reviews, this article presents a new method for data collection and analysis that achieves quantitative visualization of the information from the past 18 years in the field of PFASs. Results show a significant increase in global PFASs publications, with China leading in publication output and the US in international collaborations. Author Kurunthachalam Kanna has the highest publication records. Document co-citation clustering and key line analysis identifies four major research areas and landmarks, while betweenness centrality analysis reveals developmental processes. Citation burst analysis finds that PFASs toxicity and monitoring have been hot areas, suggesting the need for greater attention towards the types and levels of PFASs in various environmental media and the removal processes of PFASs responsible for pollution, which may emerge as future research hotspots. © 2024

关键词： Toxicity

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Effect of Aluminizing and Laser Shock Peening Treatments on the High-Temperature Oxidation Resistance of AISI 321 Stainless Steel for Solar Thermal Power Heat Exchanger

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Chinese Journal of Mechanical engineering 2025年第2期38卷 199-220页

作者： Wei Li Wenyang Qin Dapeng Jiang Guowei Bo Song Ni Hui Chen Yilin Zhao Weiying Huang Xulong Peng Jianjun He Yanjie Ren Cong Li Libo Zhou Shengde Zhang Jian Chen Changsha Environmental Protection Vocational College School of Energy and Power Engineering Changsha University of Science and Technology State Key Laboratory of Powder Metallurgy Central South University School of Civil Engineering Changsha University of Science and Technology Japan Electric Power Central Research Institute

The high-temperature oxidation resistance of AISI 321 stainless steel used in solar thermal power heat exchangers determines its service life. In this study, aluminizing and subsequent laser shock peening（LSP） treatments were employed to improve the high-temperature oxidation resistance of AISI 321 stainless steel at 620 °C. These two treatments decreased the oxidation rate of AISI 321 steel. Specifically, the optimal oxidation resistance was observed in aluminized steel before oxidation for 144 h owing to the increased entropy of the LSP-treated specimen. After 144 h, LSP-treated steel achieved the best oxidation resistance because of the formation of a protective α-Al2O3film. Moreover, the large amount of subgrain boundaries formed on the aluminized layer of the LSP-treated samples could act as short-circuit paths for the outward diffusion of Al, facilitating the rapid nucleation of α-Al2O3. Meanwhile, the aluminized layer could isolate the contact between the oxidation environment and matrix, thereby decreasing the oxidation rate. Furthermore, the minimum oxidation parabolic constant was calculated for LSP-treated steel(6.45787×10-14), which was 69.18% and 36.36% that of aluminized and 321 steel, respectively, during the entire oxidation process. Therefore, the combination of aluminizing and LSP treatments can improve the high-temperature oxidation resistance of 321 stainless steel, providing a new idea for its surface treatment to achieve a long service life at high temperatures.

关键词： AISI 321 stainless steel Aluminizing High-temperature oxidation resistance Laser shock peening Oxidation film

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Unveiling microplastic distribution and interactions in the benthic layer of the Yangtze River Estuary and East China Sea

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environmental science and Ecotechnology 2024年第4期20卷 114-122页

作者： Xinyu Ge Feng Xu Bo Li Lili Liu Xiao Lu Lijuan Wang Yunxiao Zhang Jiangpeng Li Jiawei Li Yuanyuan Tang School of Environmental Science and Engineering College of EngineeringSouthern University of Science and TechnologyShenzhen518055China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resource and Environmental EngineeringEast China University of Science and TechnologyShanghai200237China School of Marine Science and Technology Zhejiang Ocean UniversityZhoushan316004China

Microplastics(MPs),recognized as an emerging global environmental concern,have been extensively detected worldwide,with specific attention directed towards the Yangtze River Estuary(YRE)and East China Sea(ECS)*** their critical research significance,there remains a knowledge gap concerning the distribution of MPs in the benthic layer within this area,particularly regarding interactions governing their *** we illuminate the distribution of MPs within the benthic layer and unravel the intricate interplay between bottom water and sediment in the YRE and *** find that MPs are notably more abundant in bottom water,ranging from 8 to 175 times higher than in surface *** MPs predominantly consist of polyester fibers,exhibit a size range between 0.5 and 5.0 mm,and display distinct ***-occurrence network analysis and Principal Coordinate Analysis confirm a robust correlation between MPs in bottom water and sediment,signifying the pivotal role of bottom water in mediating the distribution and transportation of MPs within the benthic ***,a positive correlation between MPs in sediment and bottom water turbidity underscores the impact of surface sediment resuspension and upwelling on MPs *** study clarifies the intricate interactions within the benthic layer and highlights the crucial role of bottom water as a mediator in the vertical distribution of MPs,advancing our understanding of the“source-to-sink”transport processes governing MPs within water-sediment systems.

关键词： Microplastics Bottom water Sediment Distribution Correlation analysis

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Unintentional emissions of polychlorinated naphthalenes in China:Sources,composition,and historical trends

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Journal of environmental sciences 2025年第2期148卷 221-229页

作者： Ye Huang Lin Huang Ying Li Nazupar Sidikjan Yunshan Zhang Yan Chen Yangmin Chen Ye Li Wei Du Long Chen YanWu Shanshan Zhang Jing Yang Wenjun Meng Guofeng Shen Min Liu Shu Tao Key Laboratory of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghai 200241China Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control Faculty of Environmental Science&EngineeringKunming University of Science&TechnologyKunming 650500China Laboratory of Earth Surface Processes College of Urban and Environmental SciencePeking UniversityBeijing 100871China

Polychlorinated naphthalenes(PCNs)are detrimental to human health and the *** the commercial production of PCNs banned,unintentional releases have emerged as a significant environmental ***,relevant information is still *** this study,provincial emissions for eight PCNs homologues from 37 sources in the Chinese mainland during the period of 1960-2019 were estimated based on a source-specific and time-varying emission factor *** results showed that the total PCNs emissions in 2019 reached 757.0 kg with Hebei ranked at the top among all the provinces and iron&steel industry as the biggest ***-chlorinated PCNs comprised 90%of emissions by mass,while highly chlorinated PCNs dominated in terms of toxicity,highlighting divergent priorities for mitigating emissions and safeguarding human *** emissions showed an overall upward trend from 1960 to 2019 driven by emission increase from iron&steel industry in terms of source,and from North China and East China in terms of geographic ***-capita emissions followed an inverted U-shaped environmental Kuznets curvewhile emission intensities decreased with increasing per-capita Gross Domestic Product(GDP)following a nearly linear pattern when log-transformed.

关键词： PCNs Emission inventory Emission factor Composition profile Emission intensity Chinese mainland

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Bioleaching of vanadium from stone coal vanadium ore by Bacillus mucilaginosus:Influencing factors and mechanism

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International Journal of Minerals,Metallurgy and Materials 2024年第8期31卷 1828-1838页

作者： Yingbo Dong Jinyu Zan Hai Lin School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

Vanadium and its derivatives are used in various industries,including steel,metallurgy,pharmaceuticals,and aerospace *** China has massive reserves of stone coal resources,these resources have low ***,the effective extraction and recovery of metallic vanadium from stone coal is an important way to realize the efficient resource utilization of stone coal vanadium ***,Bacillus mucilaginosus was selected as the leaching *** vanadium leaching rate reached 35.5%after 20 d of bioleaching under optimal operating *** cumulative vanadium leaching rate in the contact group reached 35.5%,which was higher than that in the noncontact group(9.3%).The metabolites of ***,such as oxalic,tartaric,citric,and malic acids,dominated in bioleaching,accounting for 73.8%of the vanadium leaching ***,during leaching,the presence of stone coal stimulated the expression of carbonic anhydrase in bacterial cells,and enzyme activity increased by 1.335-1.905 *** activity positively promoted the production of metabolite organic acids,and total organic acid content increased by 39.31 mg·L^(-1),resulting in a reduction of 2.51 in the pH of the leaching system with stone *** effect favored the leaching of vanadium from stone *** force microscopy illustrated that bacterial leaching exacerbated corrosion on the surface of stone coal beyond 10 *** study provides a clear and promising strategy for exploring the bioleaching mechanism from the perspective of microbial enzyme activity and metabolites.

关键词： Bacillus mucilaginosus stone coal vanadium ore bioleaching carbonic anhydrase organic acids

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Synthetic Cu(Ⅲ)from copper plating wastewater for onsite decomplexation of Cu(Ⅱ)-and Ni(Ⅱ)-organic complexes

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Chinese Chemical Letters 2025年第2期36卷 470-475页

作者： Junyi Yu Yin Cheng Anhong Cai Xianfeng Huang Qingrui Zhang National and Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution College of Life and Environmental ScienceWenzhou UniversityWenzhou 325035China State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseSchool of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China

Herein,the Cu(Ⅲ)synthesized from copper plating effluent was developed for the first time to evaluate the onsite degradation performance of heavy metal complexes in the wastewater,thus achieving the purpose of“treating waste with waste”.The results indicated that synthetic Cu(Ⅲ)presented the excellent decomplexation performance for Cu(Ⅱ)/Ni(Ⅱ)-organic *** removal efficiency of Cu(Ⅱ)/Ni(Ⅱ)-EDTA significantly increased with increasing Cu(Ⅲ)dosage,and the degradation of Cu(Ⅱ)/Ni(Ⅱ)-EDTA by synthetic Cu(Ⅲ)system displayed highly p H-dependent *** radical quencher experiments confirmed that Cu(Ⅲ)direct oxidation were mainly involved in the degradation of Cu(Ⅱ)-***,the continuous decarboxylation process was proven to be the main degradation pathway of Cu(Ⅱ)-EDTA in Cu(Ⅲ)*** coexisting substances(SO42-,Cl-and fulvic acids)showed little impacts at low level for the removal of Cu(Ⅱ)/Ni(Ⅱ)-EDTA,while retarded the degradation of Cu(Ⅱ)-EDTA slightly at high level,which features high selective ***,it was also effective to remove Cu(Ⅱ)/Ni(Ⅱ)-EDTA from in treating actual Cu/Ni-containing wastewater through synthetic Cu(Ⅲ)treatment.

关键词： Copper plating wastewater Cu(III) Decomplexation Treating waste with waste Selectivity

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Comprehensive study on the spatial distribution of heavy metals and their environmental risks in high-sulfur coal gangue dumps in China

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Journal of environmental sciences 2024年第2期36卷 486-497页

作者： Yingbo Dong Huan Lu Hai Lin School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory on Resource-oriented Treatment of Industrial Pollutants Beijing 100083China

The accumulation of coal gangue(CG)from coal mining is an important source of heavy metals(HMs)in *** spatial distribution and environment risk assessment are extremely important for the management and remediation of *** soil samples were collected from the high-sulfur CG site in northern China and analyzed for six *** results showed that the soil was heavily contaminated by Mn,Cr and Ni based on the Nemerow index,and posed seriously ecological risk depended on the geo-accumulation index,potential ecological risk index and risk assessment *** semi-variogram model and ordinary kriging interpolation accurately portrayed the spatial distribution of ***,Mn,and Cr were distributed by band diffusion,Ni was distributed by core,the distribution of Cu had obvious patchiness and Zn was more *** spatial autocorrelation indicated that all HMs had strong spatial *** BCR sequential extraction was employed to qualify the geochemical fractions of *** data indicated that Fe and Cr were dominated by residual fraction;Cu,Ni and Zn were dominated by reducible and oxidizable fractions;Mn was dominated by reducible and acid-extractable(25.38%-44.67%)*** correlation analysis showed that pH was the main control factor affecting the non-residue fractions of ***,acid production from high sulfur CG reduced soil pH by 2-3,which indirectly promoted the activity of ***,the conceptual model of HMs contamination at the CG site was proposed,which can be useful for the development of ecological remediation strategies.

关键词： High-sulfur coal gangue Soil contamination Heavy metals Spatial distribution Geochemical fractions Risk assessment

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A potential threat from biodegradable microplastics: mechanism of cadmium adsorption and desorption in the simulated gastrointestinal environment

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Frontiers of environmental science & engineering 2024年第2期18卷 63-75页

作者： Timing Jiang Xiang Wu Shushan Yuan Changfei Lai Shijie Bian Wenbo Yu Sha Liang Jingping Hu Liang Huang Huabo Duan Yafei Shi Jiakuan Yang School of Environmental Science&Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Resources and Environmental Science Hubei UniversityWuhan 430062China Hubei Provincial Engineering Laboratory for Solid Waste Treatment Disposal and Recycling Wuhan 430074China School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan 430068China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

It has been demonstrated that microplastics (MPs) can accumulate heavy metals from the environment and transfer them into organisms via the food chain. However, adsorption and desorption capacities for biodegradable MPs relative to those for conventional MPs remain poorly understood. In this study, cadmium (Cd(II)) adsorption and desorption characteristics of polylactic acid (PLA), a typical biodegradable MP, were investigated. Two conventional MPs, i.e., polypropylene (PP) and polyamide (PA) were used for comparison. The maximum Cd(II) adsorption capacities of the MPs studied in the adsorption experiments decreased in the order PA (0.96 ± 0.07 mg/g) > PLA (0.64 ± 0.04 mg/g) > PP (0.22 ± 0.03 mg/g). The Pseudo-second-order kinetic model and Freundlich isothermal model described the Cd(II) adsorption behaviors of PLA MPs well. X-ray photoelectron spectroscopy and two-dimensional Fourier transform infrared correlation spectroscopy analysis indicated that oxygen functional groups were the major and preferential binding sites of PLA MPs, which contributed to their high Cd(II) adsorption capacities. Simulated gastric and intestinal fluids both significantly enhanced the desorption capacities of the examined MPs. Notably, degradation of the PLA MPs during in vitro human digestion made the Cd(II) on the PLA MPs more bioaccessible (19% in the gastric phase and 62% in the intestinal phase) than Cd(II) on the PP and PA MPs. These results indicate the remarkable capacities of biodegradable MPs to accumulate Cd(II) and transfer it to the digestive system and show that biodegradable MPs might pose more severe threats to human health than conventional nonbiodegradable MPs.

关键词： Biodegradable microplastics Cadmium Adsorption and desorption Gastrointestinal environment Two-dimensional correlation spectroscopy Bioaccessibility

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A colorimetric nanobiosensor with enhanced sensitivity for detection of lead(Ⅱ)in real-water samples via an adeninecytosine mismatched DNAzyme

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Frontiers of environmental science & engineering 2024年第12期18卷 167-177页

作者： Jinchuan Liu Hang Yang Huanxing Li Jiancheng Wang Xiaohong Zhou College of Environmental Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China State Key Joint Laboratory of ESPC School of EnvironmentTsinghua UniversityBeijing 100084China

Facile and ultrasensitive detection of Pb^(2+)in water for remote or resource-limited environments remains ***-based colorimetric nanobiosensors have been extensively studied to regulate the assembly of functionalized gold nanoparticles(AuNPs).However,these nanobiosensors have been criticized for their low sensitivity owing to the difficulty of dissociating DNAzyme embedded in AuNP *** address this issue,we rationally designed a DNAzyme by introducing an adenine-cytosine(A-C)mismatch to strengthen the disassembly of DNAzyme-linked *** proof of concept,a“turn on”colorimetric nanobiosensor integrated with mismatched DNAzyme and functionalized AuNPs was first developed for Pb^(2+)*** the optimal detection conditions,the obtained typical calibration curve shows a detection limit of 8.6 nmol/L,with an approximately 11-fold sensitivity improvement in Pb^(2+)detection compared with unmismatched DNAzyme,and a linear response range from 10 to 300 nmol/*** nanobiosensor demonstrated robust selectivity and satisfactory recovery rates between 86.5%and 106.4%for Pb^(2+)in spiked environmental water ***,the detection process is user-friendly and can be completed within 30 min,requiring only a simple water sample addition *** the extensive applications of DNAzyme in conjunction with nanoparticles,this study provides a valuable reference for designing other DNAzyme-powered nanoparticle assemblies in biosensing systems.

关键词： Trace lead(Ⅱ)ions Modified mismatched DNAzyme Gold nanoparticles Colorimetric nanobiosensor environmental water samples

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