检索结果-内蒙古大学图书馆

Efficient removal of aqueous ciprofloxacin antibiotic by ZnO/CuO-bentonite composites synthesized via carbon-bed pyrolysis of bentonite and metal co-precipitation

引用

science of the Total Environment 2024年 955卷 176955页

作者： Yang, Xiaodong Yang, Xuefei Hou, Zhiyong Li, Minghui Luo, Shuaiqi Zhao, Jin Wang, Kai Guo, Yuanxia Sun, Pengkai Tan, Fang Yan, Yan Liu, Lulu Wang, Lili Han, Ye Zeng, Fanming Zimmerman, Andrew R. Gao, Bin Key Laboratory of Materials Design and Quantum Simulation School of Material Science and Engineering Changchun University No. 6543 Satellite Road Changchun130022 China School of materials science and engineering Changchun University of Science and Technology No. 7989 Satellite Road Changchun130022 China Department of Geological Sciences University of Florida GainesvilleFL32611 United States Department of Civil and Environmental Engineering Rensselaer Polytechnic Institute TroyNY12180 United States

Antibiotics are of emerging concern due to their widespread use, lack of adequate treatment, and for their potential to threaten human health and the environment. Here, a facile fabrication approach for synthesizing ZnO/CuO-bentonite composites was investigated via carbon-bed pyrolysis of bentonite followed by ZnO/CuO co-precipitation. Sorbents were synthesized using a range of bentonite pyrolysis temperatures, metal oxide contents, and ZnO:CuO mass ratios. The ZnO/CuO-bentonite composites exhibited diverse functional groups, excellent mesoporosity, and high specific surface area (135.0 m2 g−1, four times that of pyrolyzed bentonite-only control). Ciprofloxacin removal was maximized at a bentonite pyrolysis temperature of 450 °C, a total metal oxide content of 25 %, and a Zn/Cu ratio between 95:5 and 93:7, and this material had an observed experimental CIP adsorption of 451 mg g−1 and a calculated maximum adsorption capacity of 1249.3 mg g−1. This excellent CIP sorption ability was attributed to its abundant surface active sites and multiple sorption mechanisms, including hydrogen-bond interaction, ion exchange, and electrostatic interaction. These results illustrate that ZnO/CuO-bentonite composite sorbents have excellent potential for use in environmental remediation and water treatment applications. © 2024 Elsevier B.V.

关键词： Hydrogen bonds

来源：评论

学校读者我要写书评

暂无评论

Novel Pei@Csh Adsorbents Derived from Coal Fly Ash Enabling Efficient and In-Situ CO2 Capture: The Anti-Urea Mechanism of Pore-Expanded Csh Support

SSRN

引用

SSRN 2022年

作者： Qu, Fan Yan, Feng Shen, Xuehua Li, Chunyan Chen, Heijin Zhang, Zuotai School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control Southern University of Science and Technology Shenzhen518055 China Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City Shenzhen518055 China

The solid amine adsorption is considered to be the most promising technology for post-combustion CO2 capture, but it still has drawbacks for high cost of support materials and easy occurrence of CO2-induced chemical deactivation. Herein, we proposed a novel environmentally friendly method for efficient and stable solid amine adsorbents: The calcium silicate hydrate (CSH) support with pore volume of 3.0 cm3·g-1 was synthesized from coal fly ash (CFA) with the pore-expanded assistance of azeotropic distillation, and then the PEI@CSH adsorbents were prepared by impregnating polyethylenimine (PEI) into the pores of CSH support. The adsorption capacity of the prepared 60%PEI@CSH-0.1 adsorbent reached 198 mg·g-1 and exhibited excellent cyclic stability of only 1.9% attenuation after 10 cycles under ideal regeneration conditions. Even under realistic regeneration conditions (at 150 ℃ with 100% CO2), the CO2 uptake still remained 103 mg·g-1 after 10 cycles, which showed obvious advantages than the commercial SiO2 supports. A serials of characterization techniques of FT-IR, solid-state NMR and DFT calculation were performed to explained the anti-urea mechanism of CSH support;consequently, the CSH support promoted the conversion of primary amines to secondary amines in PEI molecules, and thus effectively inhibited the inactivation caused by the formation of urea compounds. Therefore, the PEI@CSH adsorbents provides a low-cost and high-efficiency approach for both in-situ CFA utilization and CO2 mitigation inside the coal-fired power plants. © 2022, The Authors. All rights reserved.

关键词： Urea

来源：评论

学校读者我要写书评

暂无评论

An Efficient Fe2+ Assisted Uv/Electrogenerated-Chlorine Process for Carbamazepine Degradation: The Role of Fe(Iv)

SSRN

引用

SSRN 2022年

作者： Yin, Haoran Zhang, Qizhan Jing, Jiana Wang, Xuechun Yin, Xiaoya Zhou, Minghua Key Laboratory of Pollution Process and Environmental Criteria Ministry of Education College of Environmental Science and Engineering Nankai University Tianjin300350 China Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution College of Environmental Science and Engineering Nankai University Tianjin300350 China Tianjin Advanced Water Treatment Technology International Joint Research Center College of Environmental Science and Engineering Nankai University Tianjin300350 China Tianjin Fisheries Research Institute Tianjin300221 China

To improve the performance and solve the restrictions of UV/chlorine process (e.g., the narrow pH application range and high disinfection by-products (DBPs) formation), a Fe2+ assisted advanced oxidation process with electrochemically generated chlorine (UV/E-Cl/Fe2+) was proposed for carbamazepine (CBZ) degradation, which eliminated CBZ (5 mg/L) within 4 min under the optimal conditions. Compared with UV/electro-generated chlorine (UV/E-Cl) and anodic oxidation-chlorination/Fe2+ (AO-Cl/Fe2+) processes, the apparent first-order kinetics constant in UV/E-Cl/Fe2+ increased by 2.56 and 3.18 times respectively, and the energy consumption was lower (1.15 kWh/m3-log). Simultaneously, the pH application range could be expanded to 9, and DBPs formed in this process were 17.1% less than those in UV/E-Cl. Through quenching tests, electron paramagnetic resonance (EPR) experiments, measurement of •OH concentration, quantification of methyl phenyl sulfoxide (PMSO) and benzosulfone (PMSO2) and processes comparison, possible CBZ degradation pathways and mechanism of UV/E-Cl/Fe2+ were proposed, in which Fe(IV) played the dominant role in the early stage, while the production of radicals (i.e., •OH and Cl•) was enhanced with the increase of chlorine generation, accelerating the CBZ removal. Furthermore, this process demonstrated wide application prospect in treating various contaminants and real wastewaters. In conclusion, this study offers an effective and energy-efficient method for organic pollutants degradation. © 2022, The Authors. All rights reserved.

关键词： Iron compounds

来源：评论

学校读者我要写书评

暂无评论

Highly Compressive Aerogel-Elastomer Hybrid Porous Material with Redistributed Strain for High-Sensitive Soft Pressure Sensors

SSRN

引用

SSRN 2024年

作者： Liu, Yan Zhong, Zhengxiang Liang, Cuiyuan Wang, Fanyu Xu, Hongbo Wan, Ye Ma, Xinzhi Tian, Gongwei Qi, Dianpeng MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage National and Local Joint Engineering Laboratory for Synthesis Transformation and Separation of Extreme Environmental Nutrients School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China Key Laboratory of Science and Engineering for the Multi-modal Prevention and Control of Major Chronic Diseases Ministry of Industry and Information Technology Zhengzhou Research Institute Harbin Institute of Technology Zhengzhou450000 China China Silicon Coporation Ltd. China ENFI Engineering Coporation Ltd Luoyang471003 China Key Experiment of Optoelectronic Bandgap Materials Ministry of Education Harbin Normal University Harbin150500 China

Owing to the good sensitivity and simple fabrication process, flexible piezoresistive pressure sensors based on aerogels shows great applications in soft robotics, bioelectronics and so on. However, the poor compressibility and stability of the aerogel is still challenging the development of aerogel based flexible piezoresistive pressure sensors, simultaneously, it is urgent to pave a way to enhance the sensitivity of these sensors. Here, for the first time, we propose a universal strategy to prepare aerogel skeleton-elastomer shell hybrid porous material with enhanced compressibility for high-sensitive and stable flexible pressure sensors. We found that the elastomer shell disperses the strain in the aerogel skeleton and enhances the compressibility of the aerogel, which improve the stability of the sensor (10000 cycles of compression). More importantly, there are elastomer micro-blocks formed in the hybrid material, these micro-blocks redistribute the strain in the material which contributes to the high sensitivity (10.25 kPa-1) of the sensors. Furthermore, the sensors are successful in monitoring both of the large joint bending and subtle skin vibration, as well as remote controlling toy car and artificial hand. This work provides an effective and universal strategy to enhance the sensitivity and stability of the aerogel based flexible pressure sensors and promotes their development towards practical applications. © 2024, The Authors. All rights reserved.

关键词： Aerogels

来源：评论

学校读者我要写书评

暂无评论

Naturally Aged Polylactic Acid Microplastics Stunted Pakchoi (Brassica Rapa Subsp. Chinensis) Growth with Cadmium in Soil

SSRN

引用

SSRN 2023年

作者： Zuo, Jiane Xie, Zhenwen Men, Cong Yuan, Xin Miao, Sun Sun, Quanyi Hu, Jiamin Zhang, Yanyan Liu, Yuxin State Key Joint Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shenzhen International Graduate School Tsinghua University Shenzhen518055 China School of Energy and Environmental Engineering Beijing Key Laboratory of Resource-Oriented Treatment of Industrial pollutants University of Science and Technology Beijing Beijing100083 China

Biodegradable microplastics (BMPs) and cadmium (Cd) are posing threats to agro-systems especially to plants and current studies mostly used virgin BMPs to explore their ecological effects. However, effects of naturally aged BMPs and their combined effects with Cd on pakchoi are yet to be unraveled. Therefore, this study incubated naturally aged polylactic acid (PLA) MPs through soil aging process, and investigated the single and combined effects of Cd and PLA MPs (virgin and aged) on pakchoi (Brassica rapa subsp. Chinensis) morphology, anti-oxidant systems and soil microbial activities. Our results found that after being deposited in soil for six months, aged PLA (PLAa) MPs formed with a fractured surface, demonstrating more detrimental effects on pakchoi than virgin ones. PLA/PLAa MPs and Cd stunted pakchoi growth, caused oxidative stress and altered the biophysical environment in soil, separately. Moreover, co-existence of PLA/PLAa MPs and Cd caused greater damages to pakchoi than applied alone. The co-presence of PLAa MPs and Cd inhibited pakchoi biomass accumulation rate by 92.2% compared with the no-addition group. The results unraveled here emphasized BMPs, especially aged BMPs, could trigger negative effects on agro-systems with heavy metals. These findings will give reference to future holistic assessment of BMPs ecological effects. © 2023, The Authors. All rights reserved.

关键词： Cadmium

来源：评论

学校读者我要写书评

暂无评论

Study on the thermal behaviour of spontaneous combustion of open-pit minerals

引用

science of the Total Environment 2024年 929卷 172477页

作者： Zhao, Jing-Yu Chi, Zhao-Long Song, Jia-Jia Lu, Shi-Ping Zhang, Yan-Ni Lei, Chang-Kui Shu, Chi-Min School of Safety Science and Engineering Xi'an University of Science and Technology No. 58 Yanta Mid. Rd. Shaanxi Xi'an710054 China Shaanxi Key Laboratory of Prevention and Control of Coal Fire Xi'an University of Science and Technology No. 58 Yanta Mid. Rd. Shaanxi Xi'an710054 China School of Safety and Emergency Management Engineering Taiyuan University of Technology No. 79 Yingze West Street Shanxi Taiyuan030024 China Department of Safety Health Environmental Engineering National Yunlin University of Science and Technology 123 University Rd. Sec. 3 Yunlin Douliou64002 Taiwan

To study thermal behaviour during spontaneous combustion of an open-pit coal mine, mixed slag (coal, oil shale, and coal gangue) was taken as the research object. Laser thermal conductivity analyser and differential scanning calorimetry were used to test thermophysical parameters and heat release characteristics of the minerals. The parameters can be employed to calculate the apparent activation energy using the Arrhenius equation and evaluate the thermal behaviour of open-pit mixed slag. The results indicate that thermophysical parameters have stage characteristics. Thermal diffusivity and thermal conductivity of minerals, especially mixed slag, have a strong correlation with temperature. Heat flow of minerals exhibits five characteristic stages, and heat flow of the samples is consistent with the change in heating rate. During the heating process, thermal diffusivity and heat flow of the mixed slag are between those of a single mineral. Except for the mixed slag at 15 and 20 °C/min, the initial exothermic temperature of the other samples is mainly concentrated at 50–80 °C. Thermal energy release of the sample is mainly concentrated in the accelerated exothermic stage and rapid exothermic stage. Thermal energy release of mixed slag in rapid exothermic stage is always greater than that in accelerated exothermic stage, and the proportion of thermal energy release in these two stages exceeds 98 %. The apparent activation energy during the accelerated exothermic stage is lower, making it easier to release heat, and rapid exothermic stage is relatively high, which can readily lead to heat accumulation. Thermal analysis reveals that the thermal behaviour of mixed slag is significantly different from that of a single mineral. Its unique exothermic characteristics can provide a more accurate theoretical basis for the prevention and control of environmental pollution caused by slag spontaneous combustion. © 2024

关键词： Thermoanalysis

来源：评论

学校读者我要写书评

暂无评论

Synergical Effects of Nb and Sio2 on Enhanced No Elimination and Sulfur Resistance of Fe2o3-Scr Catalyst

SSRN

引用

SSRN 2023年

作者： Zhao, Wenrui Li, Lulu Ji, Jiawei Jiang, Peiting Zou, Weixin College of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang212000 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Jiangsu Key Laboratory of Vehicle Emissions Control Nanjing University Nanjing210023 China Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing210023 China Stata Key Laboratory of Green Chemical Engineering and Industrial Catalysis Sinopec Shanghai Reaserch Institute of Petrochemical Technology Shanghai201208 China

Fe2O3-based catalysts have attracted increasing interests for their use in NH3-SCR (selective catalytic reduction) reaction, while the wide application of Fe2O3-based catalysts is limited by its unsatisfying NO conversion at low temperature and poor anti-SO2 ability. In this study, by virtue of FeSi composite oxide with large specific surface area as support obtained by doping Si into pristine Fe2O3, and NbOx species was used for surface modification to further regulate their acidity and redox properties, significantly improving their NH3-SCR activity. The optimal Nb/FeSi catalyst exhibited over 90% NO conversion in the temperature interval of 250-400 oC and displayed excellent SO2 resistance at 225 oC. These resulting catalysts were characterized by various techniques to study their key physicochemical properties and identify their catalytic roles for NH3-SCR performance. For the contribution of different components to the catalytic activity, Si contributes large specific surface area and more Brønsted acid sites, facilitating the dispersion of active components and the activation of NH3 species. Nb could promote the generation of more oxygen vacancies and abundant Brønsted acid sites while inhibits the adsorption of NOx. This work provides experimental guidance to improve the activity and sulfur resistance of denitration catalyst by active component control. © 2023, The Authors. All rights reserved.

关键词： Silica

来源：评论

学校读者我要写书评

暂无评论

Arsenate Removal from Water by Ti Electrocoagulation: Main Influencing Factors, Response Surface Optimization, and Potential Mechanisms

SSRN

引用

SSRN 2023年

作者： Li, Jie Cao, Yumin Lu, Jianbo Qin, Changcai Zhang, Wei Zhang, Xintong Yi, Xuesong Yu, Wenzheng School of Economics and Management Yantai University Shandong Province Yantai264005 China School of Civil Engineering Yantai University Shandong Province Yantai264005 China Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province Hainan University Haikou570228 China State Key Laboratory of Environmental Aquatic Chemistry Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing100085 China

The efficacy and mechanism of As(V) removal by Ti electrocoagulation (Ti EC) were investigated detailedly using batch tests. The Box-Behnken design method with 3 factor 3 level was used to optimize main process parameters (electrode distance, current density, and initial pH). The obtained optimal process parameters for the maximum arsenic removal were as follows: electrode distance of 9.4 mm, current density of 15.5 A/m2, and initial pH of 6.4. Initial pH had a significant impact on the arsenic removal (P © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

来源：评论

学校读者我要写书评

暂无评论

Beam Pattern Modulation Embedded Hybrid Transceiver Optimization for Integrated Sensing and Communication

arXiv

引用

arXiv 2024年

作者： Liu, Boxun Gao, Shijian Yang, Zonghui Cheng, Xiang Yang, Liuqing State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Peking University Beijing100871 China Guangzhou511400 China Guangzhou511400 China Department of Electronic and Computer Engineering the Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong

Integrated sensing and communication (ISAC) emerges as a promising technology for 6G, particularly in the millimeter-wave (mmWave) band. However, the widely utilized hybrid architecture in mmWave systems compromises multiplexing gain due to the constraints of limited radio-frequency (RF) chains. Moreover, additional sensing functionalities exacerbate the impairment of spectrum efficiency (SE). In this paper, we present an optimized beam pattern modulation-embedded ISAC (BPM-ISAC) transceiver design, which spares one RF chain for sensing and uses the remaining ones for communication. To compensate for the reduced SE, index modulation across communication beams is applied. We formulate an optimization problem aimed at minimizing the mean squared error (MSE) of the sensing beampattern, subject to a symbol MSE constraint. This problem is then solved by sequentially optimizing the analog and digital parts. Both the multi-aperture structure (MAS) and the multi-beam structure (MBS) are considered in the analog part. We conduct theoretical analysis on the asymptotic pairwise error probability (APEP) and the Cramér-Rao bound (CRB) of direction of arrival (DoA) estimation. Numerical simulations validate the overall enhanced ISAC performance over existing alternatives. Copyright © 2024, The Authors. All rights reserved.

关键词： Mean square error

来源：评论

学校读者我要写书评

暂无评论

Study on numerical simulation of complex wave based on deep reinforcement learning method 32nd

Study on numerical simulation of complex wave based on deep ...

引用

32nd International Ocean and Polar engineering Conference, ISOPE 2022

作者： Chen, Xin You, Dawei Zhao, Enjin Zhu, Kui Guangzhou China College of Marine Science and Technology China University of Geosciences Wuhan China South China Sea Information Center of State Oceanic Administration Guangzhou China Shenzhen Research Institute China University of Geosciences Shenzhen China Key Laboratory of Marine Environmental Survey Technology and Application Ministry of Natural Resources Guangzhou China College of Electrical Engineering Naval University of Engineering Wuhan China

ISBN: (纸本)9781880653814

Numerical simulation of waves has always been a very important research topic in the field of marine engineering. However, the limitations of wave simulation by commercial simulation software are found to be very obvious in practical experiments in the field of computational fluid dynamics. In a real marine environment, it is relatively difficult to simulate irregular waves. Many researchers prefer to write their desired irregular waves in open-source numerical simulation software, but writing them by themselves requires complex derivation of formulas. In addition, the poor accuracy of simulated waves can lead to a variety of problems. In this paper, the traditional numerical wave-making method is improved and optimized. Combining with the current stable deep learning framework in the computer field, we propose a model of superposition of solitary waves based on deep reinforcement learning to simulate complex waves in the real world. Solitary waves are used as the basis for deformation and superposition to simulate various complex waveforms. A combination of deep learning and the open-source software OpenFOAM is used to train a model that can be used to approximate the irregular waves needed in practice. By using deep learning to fit a function instead of a complex computational formula and by automatically exploring the wave stacking strategy, the intelligent body learns to fit the target wave automatically during interaction with the environment in order to obtain the simulation of irregular waves. It provides new ideas for the future wave simulation direction and constructs more realistic waves. In the future, we will investigate the direction of a further combination of deep learning and computational fluid dynamics. © 2022 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Open source software

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：