检索结果-内蒙古大学图书馆

Occurrence of cadmium in groundwater in China: a review

Arabian Journal of Geosciences 2022年第17期15卷 1-13页

作者： Hoareau, Carol Emilly Hadibarata, Tony Yılmaz, Murat Environmental Engineering Program Faculty of Engineering and Science Curtin University Malaysia Miri Malaysia Department of Chemical Engineering Faculty of Engineering Osmaniye Korkut Ata University Osmaniye Türkiye

China has one of the world’s fastest-growing economies due to its increase in various industrial activities. A side effect of economic growth is severe environmental problems such as heavy metal contamination of soil and groundwater. Anthropogenic activities are the main sources of cadmium which is highly mobile and toxic with the potential to bioaccumulate in the ecosystem. It can contaminate ground and river water consequently negatively impacting agriculture and water sources. Anthropogenic source of Cd concentrations in China is 0.002 mg/L in drinking water, 0.102 mg/kg in soil, and 0.23–0.96 mg/kg in paddy soil. Geological trends and health implications of cadmium contamination in Human, southern China were analyzed. Source, transportation, and various conventional remediation processes exist today and can be categorized as biological, physical, and chemical. Using nanoparticle technology, it has been found that adsorption capacities can be 3 to 4 times higher compared to using powdered activated carbon. From the experiment carried out, a maximum adsorption capacity of 10.86 mg/g for cadmium was obtained. Cadmium intake in south China populations occurred at an alarming rate and most children were at greater risk of being affected. Therefore, cadmium contamination should be taken seriously by the responsible authorities.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nucleation effects of coccoliths in portland cement

引用

Matter 2025年

作者： Beatty, Danielle N. Srubar, Wil V. Materials Science and Engineering Program University of Colorado Boulder 4001 Discovery Drive UCB 027 BoulderCO80303 United States Department of Civil Environmental and Architectural Engineering University of Colorado Boulder 1111 Engineering Drive ECOT 441 UCB 428 BoulderCO80309 United States

This work explores the use of photosynthesized coccoliths (intricate CaCO3 particles) as a nucleation agent or cement replacement in portland cement paste. First, coccoliths were produced and harvested from the marine microalgae Emiliania huxleyi and the particle size, morphology, and mineralogy were characterized. Then, the nucleation effects of E. huxleyi coccoliths as seeding agent (0.5, 1, 3, or 5 wt % additions) and limestone filler (5 and 15 wt % cement replacements) were studied using isothermal conduction calorimetry and compressive strength testing. The results were compared with five commercially available CaCO3 sources used as nucleation agents and fillers. While the high surface area of coccoliths (12.22 m2/g) enhanced water demand, it also enhanced nucleation during cement hydration without accelerating hydration, leading to enhanced early-age strength without detriments to 28-day strength. Results highlight a potential carbon reduction strategy, namely employing photosynthesis as a method of mineral admixture production, for the cement and concrete industry. © 2025 Elsevier Inc.

关键词： Portland cement

来源：评论

学校读者我要写书评

暂无评论

Reviving the Absorbent Chemistry of Electrochemically Mediated Amine Regeneration for Improved Point Source Carbon Capture

SSRN

引用

SSRN 2023年

作者： Hassan, Ahmad Refaie, Abdelrahman Aleta, Prince Afshari, Mohsen Kalantari, Elmira Fang, Yuanyuan Rahimi, Mohammad Mim Department of Civil and Environmental Engineering University of Houston HoustonTX77204 United States Materials Science and Engineering Program University of Houston HoustonTX77204 United States

Electrochemically mediated amine regeneration (EMAR) is emerging as a promising electrochemical approach for carbon capture from point sources. In this study, for the first time, the absorbent chemistry of the EMAR process was revived by considering criteria beyond metal-amine complexation. The systematic investigation focused on using secondary amines, which were previously overlooked in EMAR due to limited metal-amine interaction, despite their proven effectiveness in conventional carbon capture processes. The integration of secondary amines— monoethanolamine (MEA), aminomethyl propanol (AMP), and methyldiethanolamine (MDEA)—with the benchmark ethylenediamine (EDA) was thoroughly studied, evaluating their impact on absorption and desorption kinetics and capacities, and electrochemical performance. Among the blends, EDA+MDEA emerged as the top performer, particularly excelling in electrochemical aspects. The charge transfer resistance (RCT) of the deposition reaction, as the rate-limiting step, for the EDA+MDEA blend was reduced by 40% compared to pure EDA, and the heterogeneous electron transfer rate constant (k0) improved threefold. In the bench-scale assessments, the EDA+MDEA blend showed a notable decrease in desorption energetics to 37 kJ/molCO2, marking a 34% reduction compared to the 56 kJ/molCO2 required for pure EDA. This marks the lowest reported energetics for an EMAR process targeting point source carbon capture. This research paves the way for future systematic investigations of a wider range of amine blends for EMAR and eventually the process implementation at larger scales. © 2023, The Authors. All rights reserved.

关键词： Amines

来源：评论

学校读者我要写书评

暂无评论

The Role of Fe(Iv) in the Zero-Valent Iron Biochar Activated Persulfate System for Treatment of Contaminants of Emerging Concern

SSRN

引用

SSRN 2024年

作者： Peng, Guilong Gong, Wenwen He, Dandan Wang, Xiao Yan, Yuting Dionysiou, Dionysios D. Blaney, Lee Institute of Quality Standard and Testing Technology Beijing Academy of Agriculture and Forestry Science Beijing100097 China State Key Laboratory of Resource Insects College of Sericulture Textile and Biomass Sciences Southwest University Chongqing400715 China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering University of Cincinnati CincinnatiOH45221 United States University of Maryland Baltimore County Department of Chemical Biochemical and Environmental Engineering BaltimoreMD21250 United States Yibin Academy Southwest University Yibin China

In this paper, Fe(IV) was analyzed in the zero-valent iron biochar (ZVI-BC) activated persulfate (PS) process with methyl phenyl sulfoxide (PMSO) as the probe compound. Without a reaction terminator, PMSO degradation continued during the sample holding time, resulting in significant errors in the kinetics analysis. When 1 mM NaNO2, 1 mM NH2OH, 10 mM Na2S2O3, and 10 mM dimethyl sulfoxide were used as terminators, the analytical interference to PMSO and its oxidation product, methyl phenyl sulfone (PMSO2), was reduced to a negligible level, enabling detection by high performance liquid chromatography. In addition to Fe(IV), free radical (i.e., SO4•–, •OH, O2•–) and nonradical (i.e., 1O2) reactive species were also involved in the ZVI-BC/PS system;however, Fe(IV) was the predominant reactive species. Generally, organic contaminants with electron-donating moieties rapidly reacted with Fe(IV), and the relative contribution of Fe(IV) to overall contaminant degradation decreased as the solution pH was increased. Overall, this study provided new insights into the quantitative analysis of Fe(IV) in the ZVI-BC/PS system and its application to treatment of organic contaminants in solutions with variable water quality. © 2024, The Authors. All rights reserved.

关键词： Sodium compounds

来源：评论

学校读者我要写书评

暂无评论

Hydroxyl Radical-Driven Transformations of Bisphenol a and 2,4 Dinitroanisole: Experimental and Computational Analysis

SSRN

引用

SSRN 2023年

作者： Das Schober, Jaya Burdsall, Adam C. Searcy, Troy Hart, Jeffry Shade, Megan Harper, Willie F. Air Force Institute of Technology Environmental Engineering and Science Program Department of Systems Engineering and Management 2950 Hobson Way Wright-Patterson AFB OH45433 United States

This study used experimental and computational analysis to investigate the advanced oxidation of bisphenol A (BPA) and 2,4 dinitroanisole (DNAN). The pseudo first-order reaction rate constants depended on the molar peroxide ratio and were between 0.13 and 0.28 per min for BPA and between 0.018 and 0.032 per min for DNAN. Hydroxyl radical scavenging was strongly implicated by the experimental results. The kinetic differences appear to be due in part to the energy requirement for oxidation, which was 9.32 kcal/mol for BPA and 36.37 kcal/mol for DNAN. Transformation pathways were analyzed using Density Functional Theory (DFT), which helped to predict the presence of experimentally-detected byproducts. The most energetically favored pathway for BPA oxidation begins with formation of hydroxylated derivatives, while for DNAN the most energetically favorable degradation pathway begins with substitution of methoxy group. Overall, these findings demonstrate the power of combining experimental and computational tools to reveal transformation mechanisms for emerging water pollutants. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

来源：评论

学校读者我要写书评

暂无评论

Vibration problem due to railway loading 1

Vibration problem due to railway loading

引用

1st Universitas Lampung International Conference on science, Technology and Environment, ULICOSTE 2020

作者： Alami, F. Afriani, L. Faculty of Engineering University of Lampung Bandar Lampung Indonesia Postgraduated Student of Study Program of Environmental Science University of Lampung Bandar Lampung Indonesia

Train is one of transportation mode is increasingly polular in Indonesia nowdays, although in developed countries this transportation has long been a very advanced mode of mass transportation. Problems due to railroad tracks adjacent to densely populated settlements cannot be avoided. Problems such as noise levels can interfere with the health and comfort of the environment, vibrations in the surrounding environment due to passing trains cause some damage to civilian buildings such as residents' houses and high rise buildings as well. This field study shows the potential problem due to mass train loading (Babaranjang) in Bandar Lampung. © Published under licence by IOP Publishing Ltd.

关键词： Mass transportation

来源：评论

学校读者我要写书评

暂无评论

A Technology-Organization-Environment (TOE) Framework Based on Scientometry for Understanding The Risk Factors in Sustainable Water Resources Management

引用

Water Resources Management 2023年第15期37卷 5849-5869页

作者： Lin, Chih-Hsien Chen, Wei-Hsiang Institute of Environmental Engineering National Sun Yat-sen University Kaohsiung804 Taiwan Aerosol Science and Research Center National Sun Yat-sen University Kaohsiung804 Taiwan Center for Emerging Contaminants Research National Sun Yat-sen University Kaohsiung804 Taiwan Department of Public Health Kaohsiung Medical University Kaohsiung807 Taiwan Doctoral and Mater Degree Program in Toxicology Kaohsiung Medical University Kaohsiung807 Taiwan

The study of how water can be used sustainably through risk management has become increasingly complex due to the many different aspects involved. This study used a three-step approach to investigate the issue: trend analysis, bibliometric analysis, and the development of a conceptual TOE framework. The trend analysis identified water conservation and water crisis as the most frequently mentioned keywords, suggesting the need to address public concern for these issues. The bibliometric analysis found that 37% of the articles were published in the last three years, and environmental science and technology was the most common field of study. The TOE framework was used to link and group the keywords (risk factors) from the articles into three categories: technology, organization, and environment. This framework provides a way to understand the different factors that contribute to water scarcity and to develop strategies for addressing these risk factors. The three risk factors with the highest scores were statistical analysis (technology), climate change (environment), and uncertainty (environment). In the technology category, statistical analysis, sustainable development, and water quality were the most important risk factors. In the organization category, water management, governance, and water markets were the most important risk factors. In the environment category, climate change, uncertainty, and flood were the most important risk factors. This study is expected to provide valuable insights into the research trends that are important for achieving sustainability in water resource management, both in conventional and academic studies, over the past decade. Graphical Abstract: [Figure not available: see fulltext.]. © 2023, The Author(s), under exclusive licence to Springer Nature B.V.

关键词： Sustainable development

来源：评论

学校读者我要写书评

暂无评论

Treatment with metal–organic frameworks (MOFs) elicits secondary metabolite accumulation in Aquilaria crassna (agarwood) callus culture

引用

Discover Plants 2025年第1期2卷 1-9页

作者： Overmans, Sebastian Alflayyeh, Yazan Gutiérrez, Sergio Aldlaigan, Yousef Lauersen, Kyle J. Bioengineering Program Biological and Environmental Sciences and Engineering Division King Abdullah University of Science and Technology (KAUST) Jeddah Kingdom of Saudi Arabia Plant Tissue Culture & Biotechnology Center Ministry of Environment Water and Agriculture of Saudi Arabia (MEWA) Riyadh Kingdom of Saudi Arabia

Thymelaceaous trees are prized for accumulating fragrant resins composed of hundreds of secondary metabolites in their woody tissues. Slow growth and increasing consumer demand have stretched natural sources of agarwood trees to being endangered and alternative production modes, including silviculture and tissue culture, are currently being investigated. Dedifferentiated tissue culture of agarwood trees provides a means of cell propagation independent of environmental context. However, secondary metabolite accumulation, as found in fragrant resins, occurs largely in response to wounding. Here, we investigated the application of metal-organic frameworks (MOFs) as potential elicitors of secondary metabolite formation in Aquilaria crassna tissue culture. Callus cultures were exposed to five commercially available MOFs (UiO-67, MOF-808, HKUST-1, ZIF-67, and MOF-74) and ethanol extracts were analysed using GC-MS to quantify secondary metabolite accumulation in MOF-exposed cultures compared to untreated cultures. Samples that were exposed to either of the two Zr-based MOFs exhibited metabolite production profiles that were similar to each other, (trans-2-Carboxy-cyclo-hexyl)-acetic acid was reduced in the presence of all MOFs, the Cu-containing HKUST-1 MOF increased palmitic acid levels, and ZIF-67 (at 20 mg/L) was found to elicit the highest accumulation of secondary metabolites with potential fragrance applications. These results demonstrate the possibility of eliciting secondary metabolites from dedifferentiated agarwood tree cell culture and may provide an alternative means of sourcing fragrant specialty chemicals from these plants.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Flood Modelling for an Urban Indian Catchment: Challenges and Way Forward

Flood Modelling for an Urban Indian Catchment: Challenges an...

引用

Virtual Conference on Disaster Risk Reduction, VCDRR 2021

作者： Ghosh, Mousumi Karmakar, Subhankar Ghosh, Subimal Interdisciplinary Program in Climate Studies Indian Institute of Technology Bombay Mumbai400076 India Environmental Science and Engineering Department Indian Institute of Technology Bombay Mumbai400076 India Centre for Urban Science and Engineering Indian Institute of Technology Bombay Mumbai400076 India Department of Civil Engineering Indian Institute of Technology Bombay Mumbai400076 India

ISBN: (纸本)9789811655005

The current study aims to develop a holistic hydrodynamic flood modelling framework for the Mithi catchment of Mumbai city, India, which is subjected to flooding almost every year causing huge losses and inconvenience. A one-dimensional flood model (MIKE 11) which accounts for the river discharge along with stormwater drainage discharge is coupled with a two-dimensional flood model (MIKE 21) which simulates the overland flow in the MIKE FLOOD platform along with the major flood influencers such as rainfall and tidal elevation to develop a three-way coupled flood modelling framework. The flood parameters obtained from this framework are translated into flood inundation maps which account for flood depth and flood hazard maps which account for flood depth along with spatial velocity and can help to identify the potential areas at risk. However, hydrodynamic flood modelling is highly data-intensive and requires good resolution meteorological, hydraulic, and topographical data sets. Therefore, the unavailability of long-term and reliable data sets in developing and underdeveloping countries cause a major hindrance for modelling in such catchments. The current study also adapts alternate robust methods to address the challenge of data scarcity of rainfall, discharge, tidal elevation, and drainage network. The proposed framework and methods are generic and can be incorporated in similar data-scarce urban catchments for effective flood management. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Hydrodynamics

来源：评论

学校读者我要写书评

暂无评论

An ANN-Based Electronic Nose for Monitoring Pollutant Gases in Landfills

An ANN-Based Electronic Nose for Monitoring Pollutant Gases ...

引用

IEEE Instrumentation and Measurement Technology Conference

作者： Juliene dos Santos Davi Muniz Francisco Auriberto Ferreira Marques Junior Cleonilson Protasio De Souza William De Paiva Post-Graduate Program of Electrical Engineering Federal University of Paraíba João Pessoa PB Brazil Post-Graduate Program of Environmental Science and Technology State University of Paraíba Campina Grande PB Brazil Department of Electrical Engineering Federal University of Paraíba João Pessoa PB Brazil Department of Sanitary and Environmental Engineering State University of Paraíba João Pessoa PB Brazil

ISBN: (数字)9798350380903

ISBN: (纸本)9798350380910

Biogas generated from urban solid waste degradation in landfills is composed of various types of gases, some of them are very toxic and harmful to the health of both humans and animals, and contribute directly to global warming as well. In this way, the monitoring of biogas concentration in landfills and their surroundings is very important because this can assess the air contamination around landfills, as well as to propose means to minimize it. In this work, an electronic nose for gas identification and measurement of gases present in landfill biogas using an Artificial Neural Network (ANN) is introduced. The ANN training data have been collected by the developed electronic nose, which consisted on a set of low-cost gas sensors and on a signal acquisition system controlled by the LabViewsoftware. After the ANN training, a neural architecture has been obtained and implemented in a microcontrolled digital system to measure different gas concentrations, mainly, methane. The main results of the proposed ANN-based Electronic Nose show that it was possible to measure the gases concentrations, with RMSE less than 1%, for the most of target gases, confirming the accuracy of the developed system.

关键词： Gases Semiconductor device measurement Accuracy Landfills Artificial neural networks Electronic noses Biogas

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：