检索结果-内蒙古大学图书馆

Enhanced performance of hierarchical porous HKUST-1/g-C3N4 heterostructure in the degradation of antibiotics with and without light

引用

Separation and Purification technology 2025年 376卷

作者： Nie, Liqin Wang, Kaige Zhao, Wei Zhang, Chen Shen, Tiehan Key Laboratory of Photoelectronic Technology of Shaanxi Province Xi'an China National Center for International Joint Research of Photoelectric Technology & Nano-Functional Materials and Application Xi'an China Institute of Photonics and Photon-Technology Northwest University Xi'an China Joule Physics Laboratory School of Science Engineering and Environment University of Salford Greater Manchester SalfordM5 4WT United Kingdom

Currently, the advanced oxidation processes (AOPs) for water treatment are limited by the demand on externally supplied oxidants or illumination. To overcome these constraints, a series of micro-nano-composites composed of a copper-based metal–organic framework 'HKUST-1' and graphitic carbon nitride (g-C3N4) nanosheets, were designed and synthesized via electrostatic self-assembly, hydrothermal treatment and decarboxylation. These hierarchical porous catalysts (HP-HKUST-1/g-C3N4) exhibit outstanding characteristics, particularly, in the degradation of Tetracycline Hydrochloride (TCH) under either total darkness or visible illumination. Experimental results demonstrate that TCH can be effectively degraded without externally supplied oxidant. Under dark conditions, 30 mg of the catalyst removed 99.92% of 50 mL 50 mg·L−1 TCH in 30 min;under visible light, 99.95% degradation was achieved in just 20 min. The exceptional performance is attributed to high Cu(I) content which offer strong reducing power to activate O2 to generate H2O2. Additionally, photoexcited electrons in g-C3N4 transfer to HKUST-1 via heterojunctions, which suppresses the recombination of electron-hole pairs in g-C3N4 and supplies extra electrons for the O2 reduction in HKUST-1. This study not only presents ideas for designing highly efficient catalysts with self-produced H2O2 by activating O2, but also proposes a practical pathway towards the development of AOPs for wastewater treatment. © 2025 The Authors

关键词： Carboxylation

来源：评论

学校读者我要写书评

暂无评论

Effect of Mold Temperature on the Solidification Process and Microstructure of Zr-Based Metallic Glasses During Casting

SSRN

引用

SSRN 2023年

作者： Jin, Zhishuai Zhang, Chaojun Cao, Guanyu Qiu, Ziao Zhang, Lunyong Shen, Hongxian Jiang, Sida Cao, Fuyang Huang, Yongjiang Ma, Mingzhen Ramasamy, Parthiban Eckert, Jürgen Sun, Jianfei School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China National Key Laboratory of Precision Hot Processing of Metals Harbin Institute of Technology Harbin150001 China National Key Laboratory of Space Environment and Matter Behaviors Harbin Institute of Technology Harbin150001 China Erich Schmid Institute of Materials Science Austrian Academy of Sciences Leoben Austria State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

The influence of mold temperature on the solidification process and microstructure evolution of amorphous melts was investigated. Increasing the mold temperature was found to be beneficial for improving the solidification time without affecting the solidification behavior of amorphous melt. However, an excessively high mold temperature prolongs the duration of the supercooled liquid state, resulting in a considerable increase in the glass transition time and a decline in the cooling rate, which ultimately leads to the crystallization of the sample. In addition, it has been observed that an optimal mold temperature is beneficial to improve the internal temperature gradient of the sample, thus reducing the risk of distortion or cracking. Appropriate control of mold temperature can provide valuable guidance for large-size amorphous castings and associated process parameters. © 2023, The Authors. All rights reserved.

关键词： Microstructure

来源：评论

学校读者我要写书评

暂无评论

Foliar application of microbial nano-selenium enhances selenium uptake and alleviates oxidative stress

Microbe (Netherlands)

引用

Microbe (Netherlands) 2024年 4卷

作者： Ma, Fang Yang, Lichen Zhao, Tiantian Yuan, Yongqiang Zheng, Shixue National Key Laboratory of Agricultural Microbiology College of Life Science and Technology Huazhong Agricultural University Wuhan 430070 China Key Laboratory of Karst Georesources and Environment Ministry of Education College of Resources and Environmental Engineering Guizhou University Guiyang 550025 China

Selenium (Se) is an essential micronutrient to humans and animals in diet primarily from edible crops. However, limited studies have been conducted on applying microbially synthesized Se nanoparticles (BioSeNPs) to affect plant Se uptake and toxicity. The bacterium Bacillus wiedmannii ES2–45 was able to efficiently produce BioSeNPs by completely reducing 5 mM selenite [Se(IV)] within 24 h. Then, fermented BioSeNPs were sprayed on the leaf surface of Brassica rapa L to investigate their effects on growth and Se accumulation. Total Se and leaf biomass increased significantly by 124 % and 14.3 % respectively in the BioSeNP treatment compared to the Se(IV) treatment. The Se(VI) treatment was found to be toxic to the leaves although Se(VI) had similar effects to BioSeNP treatments. Notably, BioSeNP treatment significantly increased the plant's ability to alleviate oxidative stress including levels of chlorophyll, malonaldehyde (MDA), and catalase (CAT) (P<0.05). In conclusion, the foliar application of BioSeNPs is a promising strategy to improve the Se content of vegetables and alleviate Se-induced oxidative stress. © 2024 The Authors

关键词： Bacteria BioSeNP fermentation Brassica rapa L. Foliar application Se-biofortification

来源：评论

学校读者我要写书评

暂无评论

Removal of algae and algogenic odor compounds via combined pre-chlorination and powdered activated carbon adsorption for source water pretreatment

引用

Separation and Purification technology 2023年 304卷

作者： Zheng, Zheng-Xiong Lin, Yi-Li Fang, Ruo-Fan Zhou, Xiao-Yang Liu, Zhi Dong, Zheng-Yu Zhang, Tian-Yang Xu, Bin State Key Laboratory of Pollution Control and Resource Reuse Key Laboratory of Yangtze Water Environment Ministry of Education College of Environmental Science and Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China Department of Safety Health and Environmental Engineering National Kaohsiung University of Science and Technology Kaohsiung824 Taiwan

This study investigated the combination sequence and time interval of chlorination and powdered activated carbon (PAC) adsorption for the control of algae inactivation, algogenic odor removal, and disinfection by-product (DBP) formation. Results indicated that pre-chlorination/post-PAC exhibited the highest algae removal efficiency in all sequential combinations of PAC adsorption and chlorination, while it had displayed slight effect on the removal of DBPs. The evaluated sequential combinations all had significant effect on the removal of odor. Nevertheless, prolonged time interval between chlorination and PAC adsorption exhibited enhanced control of algae and odor compounds in all experiments;with increasing time interval from 0 to 15 min in pre-chlorination/post-PAC process, the removal efficiency of Chl-a, algal cell viability, GSM, and 2-MIB increased by 46%, 15%, 15% and 23%, respectively. In the combined processes, the odor removal efficiency was positively correlated with PAC dosage but negatively correlated with chlorine dosage. Furthermore, PAC addition could effectively reduce the total DBP yields, especially the N-DBPs. This study can provide a better understanding of improving in-situ operation of the pre-chlorination and PAC dosing systems for source water pretreatment. © 2022 Elsevier B.V.

关键词： Algae

来源：评论

学校读者我要写书评

暂无评论

Kinetics, thermodynamics, and equilibrium of As(Ⅲ),Cd(Ⅱ), Cu(Ⅱ) and Pb(Ⅱ) adsorption using porous chitosan bead-supported MnFe_(2)O_(4) nanoparticles

引用

International Journal of Mining science and technology 2021年第6期31卷 1107-1115页

作者： Hongxia Li Hongbing Ji Xinglan Cui Xiaokui Che Qidong Zhang Juan Zhong Rongzhen Jin Lei Wang Yi Luo National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals GRINM Resources and Environmental Technology Corporation LimitedBeijing 101407China Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollution School of Energy and Environmental EngineeringUniversity of Science and Technology BeijingBeijing 100083China GRINM Group Corporation Limited Beijing 100088China GRIMAT Engineering Institute Corporation Limited Beijing 100088China

A novel porous nanocomposite,cross-linked chitosan and polyethylene glycol(PEG) bead-supported MnFe_(2) O_(4) nanoparticles(CPM),was developed as an efficient adsorbent to remove metalloid(As(Ⅲ))and heavy metals(Cd(Ⅱ),Cu(Ⅱ),and Pb(Ⅱ)).The characteristics of CPM showed a porous structure,well dispersed MnFe_(2) O_(4),and several of hydroxyl and amino groups(-OH,-NH_(2)).Batch experiments demonstrated that the best adsorption property of As(Ⅲ),Cd(Ⅱ),Cu(Ⅱ),and Pb(Ⅱ) was achieved within 8 h with maximum adsorption capacities of 9.90,9.73,43.94,and 11.98 mg/g,*** and synergistic effects(particularly precipitation) were included in the co-adsorption mechanism of As(Ⅲ) and heavy ***,As(Ⅲ) was partly oxidized by MnFe_(2) O_(4) to As(V),and both were coordinated on MnFe_(2) O_(4) ***(Ⅱ) could also bind to MnFe_(2) O_(4) by ion exchange and electrostatic ***,Cd(Ⅱ) and Cu(Ⅱ) tended to be coordinated on ***,CPM can serve as a remediation material for water and soil co-contaminated with As(Ⅲ) and heavy metals.

关键词： Equilibrium Adsorption Arsenic Cadmium Chitosan MnFe_(2)O_(4)nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Contrasting Changes in Ozone During 2019–2021 between Eastern China and the Other Regions of China

SSRN

引用

SSRN 2023年

作者： Ni, Yiqian Yang, Yang Wang, Hailong Li, Huimin Li, Mengyun Wang, Pinya Li, Ke Liao, Hong Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science and Engineering Nanjing University of Information Science and Technology Jiangsu Nanjing China Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory RichlandWA United States

Ozone pollution is one of the most severe air quality issues in China that poses a serious threat to human health and ecosystems. During 2019-2021, the maximum daily 8-hour average O3 concentrations in eastern China (110-122.5°E, 26-42°N) and the rest of China (ROC) show different decreasing patterns, with O3 concentrations in eastern China decreasing by 14.9 μg/m3, which is much larger than 4.8 μg/m3 in ROC. Here, based on the atmospheric chemical transport model (GEOS-Chem) simulations and the machine learning (ML) model (LightGBM) predictions, the reasons for the differences in O3 changes between eastern China and ROC during the warm season (April to September) are investigated. Changes in the meteorological conditions contributed to an ozone decrease by 7.3 (6.8) μg/m3 in eastern China and 6.8 (7.0) μg/m3 in ROC, according to the GEOS-Chem (LightGBM) results, which can be explained by the decrease in chemical production and weakened horizontal and vertical advection. With the influence of meteorological factors excluded, the observations show that changes in anthropogenic emissions resulted in an ozone decrease by 7.6 (8.1) μg/m3 in eastern China and an ozone increase by 2.0 (2.2) μg/m3 in ROC, which is primarily induced by the changes in NOx emissions. The surface measurements and satellite retrievals also indicate that the reduction in NOx emission in ROC is less efficient than that in the more developed eastern China, leading to contrasting changes in ozone concentrations between eastern China and ROC during 2019–2021. Our results highlight the critical need to reduce ozone precursor emissions in the rest regions of China apart from eastern China. © 2023, The Authors. All rights reserved.

关键词： Machine learning

来源：评论

学校读者我要写书评

暂无评论

Ysz-Based Infrared Emissivity Performance of Electroplated Pt Composite Coatings

SSRN

引用

SSRN 2025年

作者： Zhang, Jingqin Zhuang, Tong Zhang, Xiaofeng Meng, Zihao Wu, Jian Yang, Wenchao Zhan, Yongzhong School of Resources Environment and Materials Guangxi University Guangxi Nanning530004 China National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New Materials Guangdong Academy of Sciences Guangzhou510651 China Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science & Technology Liuzhou545006 China School of Materials Science and Engineering Jingdezhen Ceramic University Jingdezhen333403 China School of Materials Science and Engineering Central South University Changsha410083 China

This study aims to examine the infrared emissivity characteristics of electroplated platinum composite coatings derived from yttria-stabilized zirconia (YSZ) ceramic coatings within the temperature range of ambient conditions to 1000 °C. Infrared emissivity tests were performed at temperatures of 25 °C, 600 °C, 800 °C, and 1000 °C, and the infrared emissivity of several coatings at ambient temperature after prolonged oxidation was assessed. The results indicate that the infrared emissivity of the composite coatings increases substantially as the temperature increases. The composite coatings with a YSZ-Al-Pt structure exhibit the least significant trend in infrared emissivity as the temperature increases. In comparison to Ni and Cr, the composite coatings exhibit optimal oxidation resistance and thermal shock resistance when the intermediate layer is composed of Al. © 2025, The Authors. All rights reserved.

关键词： Yttria stabilized zirconia

来源：评论

学校读者我要写书评

暂无评论

Separated Active Site and Reaction Space for Multi-Pollutant Elimination Significantly Enhancing Low Toxic Product Selectivity

引用

Advanced Functional Materials 2023年第48期33卷

作者： Wei, Lu Liu, Yuxi Cui, Suping Wang, Can Hsi, Hsing-Cheng Duan, Erhong Peng, Yue Dai, Hongxing Guo, Guangsheng Deng, Jiguang Key Laboratory of Beijing on Regional Air Pollution Control Beijing Key Laboratory for Green Catalysis and Separation Center of Excellence for Environmental Safety and Biological Effects Beijing University of Technology Beijing100124 China Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional Materials Ministry of Education Beijing University of Technology Beijing100124 China School of Environmental Science and Engineering Tianjin University Tianjin300350 China Graduate Institute of Environmental Engineering National Taiwan University Taipei10617 Taiwan School of Environmental Science and Engineering Hebei University of Science and Technology Hebei050018 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

It is possible to remove volatile organic compounds containing chlorine (CVOCs, such as chlorobenzene) in a single device designed for selective catalytic reduction of NOx with NH3 for the industries containing CVOCs and NOx. Breaking the efficiency-selectivity trade-off in chlorobenzene oxidation remains a major challenge due to the conjugation of halogen atoms with the benzene ring and the reducing nature of NH3. A stepwise synthesis strategy is demontrated to disperse dual Ru/Cu Lewis acid sites outside and inside the zeolite channel. Under the confinement of zeolite, the Ru4+ Lewis acid site on the external surface of the zeolite promotes chlorobenzene oxidation by weakening the p-π conjugate structure of Cl and benzene ring, while the Cu2+ Lewis acid site within the internal channel converts NOx and NH3 to N2. The mutual interference between catalytic oxidation and reduction is successfully avoided. Therefore, the low toxic CO2 and HCl selectivity experience a considerable increase from 21% to 86%, and from 51% to 94% with 91% conversion of chlorobenzene, while maintaining excellent elimination performance for NO (with N2 selectivity exceeding 90%). The incorporation of separated active sites and reaction spaces into the design may offer potentials for other energy and environmental applications. © 2023 Wiley-VCH GmbH.

关键词： Zeolites

来源：评论

学校读者我要写书评

暂无评论

Perilla frutescens: A new strategy for uranium decorporation

引用

Chemosphere 2024年 350卷 141066页

作者： Cao, Yalan Wang, Zeru Song, Wanrong Liu, Yawen Zhao, Qian Li, Wenhao Zheng, Caohui Li, Wenshuang Chen, Zhengguo Zhu, Lin Duan, Tao Li, Xiaoan School of Life Sciences and Engineering Southwest University of Science and Technology Mianyang629000 China National Co-Innovation Center for Nuclear Waste Disposal and Environmental Safety Southwest University of Science and Technology Mianyang621010 China Tianfu Institute of Research and Innovation Southwest University of Science and Technology Chengdu610299 China State Key Laboratory of Environment-friendly Energy Materials Southwest University of Science and Technology Mianyang621010 China Mianyang621000 China

Radionuclide uranium is a great threat to human health, due to its high chemical toxicity and radioactivity. Finding suitable uranium decorporation to reduce damage caused by uranium internal contamination is an important aspect of nuclear emergency response. However, the poor selectivity and/or high toxicity of the only excretory promoter approved by Food and Drug Administration (FDA) is an obvious disadvantage. Herein, we choose an edible natural product, the traditional Chinese medicine called Perilla frutescens (PF), which has wide sources and can be used as an excellent and effective uranyl decorporation. In vivo uranium decorporation assays illustrate the removal efficiency of uranium in kidney were 68.87% and 43.26%, in femur were 56.66% and 54.53%, by the test of prophylactic and immediate administration, respectively. Cell level experiments confirmed that it had better biocompatibility than CaNa3-DTPA (CaNa3-diethylenetriamine pentaacetate, a commercial actinide excretion agent). In vitro static adsorption experiments exhibited that its excellent selectivity sorption for uranyl. All those results findings would provide new research insights about natural product for uranyl decorporation. © 2023 Elsevier Ltd

关键词： Biocompatibility

来源：评论

学校读者我要写书评

暂无评论

Synergistic Ru-Co Atomic Pair with Enhanced Activity Toward Levulinic Acid Hydrogenation

SSRN

引用

SSRN 2024年

作者： Yang, Ying Zhang, Haonan Sun, Yuhang Wang, Shuo Wang, Qiyuan Shang, Yuxiang Lee, Sungsik Zhang, Liqiang Deng, Lei School of Chemical Engineering and Environment China University of Petroleum Beijing102249 China X-ray Science Division Argonne National Laboratory 9700 S. Cass Ave. ArgonneIL60439 United States Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China State Key Laboratory of Metastable Materials Science and Technology School of Materials Science and Engineering Yanshan University Qinhuangdao066004 China

Development of efficient metal-based catalysts is of great importance for levulinic acid (LA) hydrogenation to γ-valerolactone (GVL). The widely employed Ru-based catalysts are advantageous for H2 dissociation, however, the steric hindrance for large Ru particles hampers their coordination to C=O moiety in LA, and thereby decreasing the activity. Herein, we report a Ru1Co1-N-C double single-atom catalyst (DSAC) with synergistic Ru and Co atomic pairs for LA hydrogenation into GVL. The Ru and Co doped zeolitic imidazole frameworks (RuCo-doped ZIF-8) precursor was rationally designed ((Ru+Co)/(Zn+Ru+Co) = 2 at.%), where the Zn node spatially isolates Ru and Co species, expanding the adjacent Ru-Co distance and facilitating the formation of the Ru-Co atomic pair upon pyrolysis, with each atom coordinated with three nitrogen atoms (N3-Ru1Co1-N3). The Ru1Co1-N-C catalyst exhibits outstanding catalytic activity, with a turnover frequency (TOF) of 1980 h–1, surpassing previously reported Ru-based catalysts. Experimental investigation and density functional theory (DFT) calculations reveal that the electron-rich Ru induced by less electronegative Co facilitates H2 dissociation, while atomic Ru in dual-atomic pairs promotes C=O activation, Ru and Co atomic pairs synergistically enhancing LA conversion to GVL. This research will shed light on the precise control of active sites at atomic scale, and also provides a new concept for designing high-performance Ru-based catalysts towards LA hydrogenation to GVL. © 2024, The Authors. All rights reserved.

关键词： Hydrogenation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：