Mihaela Andreea Moncea

Mihaela Andreea Moncea
Institutul Naţional de Cercetare-Dezvoltare pentru Protecţia Mediului · The Impact of Built Environment and Nanomaterials

PhD

About

74
Publications
16,280
Reads
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143
Citations
Education
October 2009 - October 2012
Polytechnic University of Bucharest
Field of study
  • Chemical Engineering

Publications

Publications (74)
Article
Full-text available
The work relates to a composition of an additive mortar with a volumetric weight below 250kg/mc, the thermal conductivity coefficient below 0,08kcal/m×h×°C, mechanical strengths more than 7daN/cm² with self-cleaning effect after commissioning. In order to obtain a self-cleaning effect over time by eliminating chromatic deviations, the composition o...
Article
Full-text available
Conservation and restoration of heritage structures represents a highlighted issue, the main challenge being to bring the cultural objective to its original state, or as close as possible to it by using eco-friendly materials with lover impact on the environment and human health. Within this study, the calcium zincate nanoparticles have been synthe...
Article
Full-text available
The use of wastes in the architecture of new binders for construction domain is the key for the success of the progress regarding environmental, technical and economical issues. For instance, bricks wastes have huge recycling value but are often discarded for worthless junk. The wastes glasses which are difficult to be recovered are regularly dispo...
Conference Paper
Full-text available
Recovery and recycling of cathode ray tube (CRT) waste glasses has been the focus of research in the last decade, due to their environmental and economic issues (such as leaching of lead ions, high disposal costs). A sustainable method of valorizing this hazardous waste is to embed it in cement, as a substitute for the natural aggregate. Therefore,...
Article
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Nowadays, there are various nanomaterials embedded in construction materials to improve their mechanical performances, durability, heating resistance as well as some specific properties such as self-cleaning and healing abilities. In this context, investigations regarding the effect of SiO2 nano-particles embedded in a cement matrix on mechanical p...
Conference Paper
Full-text available
Due to the lead content, the cathode ray tubes (CRTs) glass waste are considered a great environmental risk, as the lead ions from broken CRT glass can leach into soils when in contact with waters from landfills. Currently, the recycling techniques used for CRT glass are limited due to the different compositions of the panel, funnel and neck of the...
Article
Full-text available
Currently, the use of nanotechnology is being explored to create materials with specific properties that perform explicit functions. Thus, the investigation of different synthesis routes of various types of silica-based materials has been pursued. Mesoporous silica can be widely used in the field of environmental protection due to its specific and...
Article
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Pigments used in ceramic glazes have been obtained by chromium ions extraction from galvanic sludge and their precipitation as barium chromate and lead chromate from technological solutions. The chemical composition was determined by XRF method. Complex thermal analysis TG-DSC, XRD and SEM methods have been used for microstructural characterization...
Article
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The continuous population growth, which leads to increased social and economic development, affects the quality and quantity of the freshwater resources, both directly through changes in landscapes and pollution caused by industrialization, urbanization, and agriculture, as well as indirectly through climate change pressures (such as higher air tem...
Article
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Identification of microplastics from the environment is a challenge mostly due to the complex nature and behavior of samples and lack of an efficient separation method. This paper approaches the issue of microplastics separation as determining step of their analysis. The separation of two types of commercial plastics from synthetic samples was inve...
Article
Identification of microplastics from the environment is a challenge mostly due to the complex nature and behavior of samples and lack of an efficient separation method. This paper approaches the issue of microplastics separation as determining step of their analysis. The separation of two types of commercial plastics from synthetic samples was inve...
Article
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The heritage conservation always remains a scientific and complex task. Either used for preservation of cellulose-based artifacts or as limestone consolidant, the nano-Ca(OH)2 is often associated with its carbonation process. The use of waste materials for nano-Ca(OH)2 synthesis transforms the entire process into a handy and sustainable one. Within...
Article
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Municipal and industrial waste discharges along with agricultural activities determines an increase of the toxic pollutants in the aquatic environments, affecting thus the living organisms. Due to the high porosities and large specific surface areas resulted from nanoscale size, mesoporous materials can be used for persistent pollutants removal. Th...
Article
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The development of new ecological materials for the construction field represents a sustainable solution for waste management as long as their properties are comparable with those of traditional materials in terms of strengths, durability, corrosion resistance etc. Considering the large amount of glass wastes that are generated (e.g. technical wast...
Article
Full-text available
In this research, the identification of the influence of several methods of rice husk ashes preparation over their structure was followed, by varying the synthesis parameters, as well as by subsequent application of the grinding process. The obtained rice husk ash samples with high silica composition, were characterized by X-ray diffraction (XRD) t...
Article
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Landfilling of end-of-life CRT (cathode ray tube), from computers and other electric or electronic equipment, is an emerging environmental issue which require immediate actions. CRT glass waste represents over 50% of the weight of WEEE (Waste Electrical and Electronic Equipment). However, recycling techniques for CRT glass represent a major problem...
Conference Paper
Full-text available
Anthropogenic activities can lead to the contamination of freshwaters with heavy metals, which are some of the most persistent pollutants in waterbodies, due to their difficulty to degrade. These pollutants can be accumulated in sediments, aquatic macrophytes and other aquatic organisms, leading to ecological disturbances and potential human health...
Conference Paper
Full-text available
Considering the continued increase in demand for mining products used in industry along with the limitations of the existing resources, a possible solution is to capitalize mining residues and recover useful elements. Besides the economic aspect that arises with the recovery of secondary raw materials, the potential impact of these residues on the...
Conference Paper
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The Romanian wetland protection represents a priority confirmed by the Ramsar Convention signed in 1971, which came into effect from 1975. In order to develop the monitoring capacity, assessment and capitalization of natural resources offered by Romanian wetlands a pilot model was developed and implemented in the Danube Delta region. An important c...
Article
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Currently, the construction and demolition wastes are recovered and recycled in a reduced proportion. An efficient and easy approach to recover this waste is to embed it in inorganics binders. Considering that bricks represent porous ceramic bodies, the incorporation of the powders resulted from brick milling into cements could influence the water...
Article
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Industrialization on a global scale has led to water pollution with a variety of persistent organic pollutants, highly toxic and hazardous to the living organisms and also difficult to remove with the existing wastewater treatment technologies. Various methods have been tested for removing these organic contaminants, among which nanotechnology appe...
Article
Full-text available
Mesoporous silica is a form of SiO2 with relatively recent use in the field of nanomaterials for environmental protection. Given the hexagonal mesoporous silica structure, characterized by a high specific surface, well defined shape and dimensions of its pores, the interest in its absorbent and catalytic properties has increased. In this context, m...
Technical Report
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2030 Agenda: "Partnerships for Sustainable Developmenton" April 16th, 2019. The conference was organized by the Department of Sustainable Development (General Secretary of the Romanian Government) in partnership with Foreign Affairs Ministry, within the context of the Romanian Presidency of the Council of the European Union.
Poster
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This paper attempts to determinate the optimal tilt angle and azimuth angle of an 100 kW photovoltaic power plant for a Bucharest region. Simulations were made with PVsyst V6.39 for south-east orientation (100; 450) and south-west orientation (100; 450), for the tilt angle the simulations were made at 100, 150, 370, 600 and 900. The simulation on 1...
Poster
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The concept of glass waste has been re-evaluated by the European Commission, thus, glass waste is considered a secondary raw material, according to EU Regulation 1179/2012. In 2014, 18.5 million tonnes of glass were generated at EU level, from which only 123.768 tonnes in Romania. The glass waste generation indicator shows that plastic packaging an...
Poster
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Considering that the wetlands represent valuable water resources, functioning as authentic natural filters for water decontamination; and improve local air quality; it can also constitute important reserves of vegetable biomass, fish, timber, firewood, etc., being thus essential the protection of the wetlands of international importance. Another va...
Poster
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The project aims to develop nanomaterials for applications in environmental protection using the hydrothermal method. For this purpose ZnO nanoparticles were obtained by hydrothermal synthesis being further characterized by x-ray diffraction (XRD) in order to determine its purity degree and scanning electron microscopy (SEM) coupled with energy dis...
Poster
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The project refers to nanosilica based materials, specifically mesoporous silica, for whom the heavy metals retention properties were improved by using nano-TiO2 and nano-ZnO. The purpose of the research is to use mixtures of TiO2 - mesoporous silica and ZnO - mesoporous silica to remove heavy metals from wastewater, benefiting from both zinc and t...
Poster
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The nanomaterials synthesis technique through pyrolysis is one of the most important tools for processing advanced materials, through a simple and rapid process of temperature decomposition of the aerosols, for the continuous synthesis of nanoparticles with adjustable dimensions, with a uniform particle size distribution as well as a high crystalli...
Poster
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The project refers to the structural and compositional characterization of various ecological materials such as cement based materials with nano-SiO2 content, brought into the system as Portland cement substitute, as well as geopolymers with 10% waste glass content.
Poster
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Durability is a very important feature for a newly developed material as it is closely related to its quality, the degradation being unavoidable do to the environmental exposure. The rate of deterioration depends on both exposure conditions and the environment aggressiveness as well as material's resistance. Thus, the project aims to assess differe...
Poster
Full-text available
The main objective of the project was to investigate the resistance over time (durability) of binder materials containing hydraulic active powder (ceramic brick powder) by substituting 20% of Portland cement compared to standard samples with 100% Portland cement. The development of prefabricated materials from traditional inorganic binders that inc...
Poster
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This study aims to investigate the chemical attack of a binder material with a 20% hydraulic active powder content (ceramic brick powder) and a water / binder ratio of 0.45. Additionally, considering the potential applications of prefabricated binder materials incorporating different types of wastes, with / without hazardous substances, the impact...
Poster
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The ongoing project aims to create a national database on secondary reserves of mining waste materials, as mining residues are of interest due to their negative impact on the environment as evidenced by the formation of acid waters, pollution with heavy metals (Pb, Cu, Zn, Cd, Hg) and metalloids (As, Sb), mechanical instability phenomena, blocking...
Article
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A study of precipitation chemistry was conducted from 2006 January to 2016 November in the Ciuc and Giurgeu basin, Eastern Carpathians, Romania. The results show that the natural precipitation in these areas is alkaline, with a volume weighted mean (VWM) of 6.49 and 6.88 in Ciuc and Giurgeu basin, respectively. NH4+ is the most potential species to...
Article
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Within this paper are evaluated some climatic factors which impact the hydrological responses in Susita catchment area. The Susita River is located in the Eastern part of Romania, between the Curvature Carpathians and the Lower Siret Plain, covering a surface of 370 km². The data used in this paper were provided by specialised institutions, such as...
Article
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The sewage network acts like a physical, chemical and biological reactor where microbial transformations occur, being a complex and extremely dynamic system. The mass transfer occurs between all the sewage subsystems: wastewater, sewage atmosphere, biofilm and sewage sediment. Using the sewage network as a 'pre-treatment step' contributes to improv...
Article
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This paper presents the numerical modeling results of the pollutant dispersion in the Danube riverbed, using experimental data recorded monthly on the Borcea - Bala - Old Danube sector, for a 2 years period. The water samples were collected from the left bank, center and right bank of the river, and the follwing indicators were analyzed: lead, nick...
Poster
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The paper presents the investigation of the effect of SiO2 nano-particles on the mechanical properties and microstructure of cement based materials. For this purpose nano-SiO2 powders were obtained by sol-gel method using different molar ratios of TEOS/ethanol/water. The formation of nano-SiO2 particles was confirmed by X-ray fluorescence analyses...
Poster
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Samples of extruded ZK60 magnesium alloy were subjected to equal channel angular pressing (ECAP) following route A, with an equivalent strain per pass equal to 1.07. The processing temperature varied from 523K to 423K. Deformation-induced grain refinement is enhanced with the number of ECAP passes, therefore after 6 ECAP passes the fine grain size...
Book
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E d i t e d b y : N a t i o n a l I n s t i t u t e f o r R e s e a r c h a n d D e v e l o p me n t i n E n v i r o n me n t a l P r o t e c t i o n (I N C D P M) 2 0 1 7 E l a b o r a t e d wi B e s t p r a c t i c e s g u i d e o n ma p p i n g a n d a s s e s s i n g we t l a n d e c o s y s t e ms a n d t h e i r s e r v i c e s Best practices...
Article
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Concrete corrosion represents a complex process, the mechanisms by which it occurs being particularized depending on the environment where it is exploited. Thus, for a concrete exploited in natural aggressive environments (alpine, marine), the corrosion processes will take place with lower speeds than for a concrete exploited in aggressive industri...
Poster
Full-text available
Nanotechnologies offer the possibility to control nanomaterials in order to create materials with advanced properties that perform specific functions. This is very important when it comes to environmental issues where pollution is often determined by a specific pollutant from a mixture of materials. For the removal of heavy metals from wastewater,...
Article
Full-text available
Air quality modelling is an essential tool for most air pollution studies. The air quality models are the means whereby pollutant emissions can be related to atmospheric pollutant concentrations. The uncertainties in assessment of air quality are related to both the quality of measured values of pollutant concentrations in local network and the inp...
Article
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The products included in the geosynthetic category (geotextiles, geogrids, geonets, geomembranes, geosynthetic clay liners, geofoam, geocells (cellular confinement) and geocomposites) have multiple civil engineering uses, being effectively used as drains and filters in civil and environmental works. The paper aims to test the performance of the geo...
Poster
Full-text available
The hydrotechnical works carried out in order to improve navigation conditions on the Calarasi - Braila sector of Lower Danube, raise up the issue of the influence they might have on the environment. Therefore, it was necessary to undertake activities for monitoring the environmental factors. Considering the importance that it has in the aquatic ec...
Presentation
Full-text available
This paper addresses the assessment of the Danube River water monitoring data obtained for the nutrient in the period 2013-2014 in order to achieve and/or maintain the environmental objectives of the Water Framework Directive (60/2000/CE). It has established the ecological status of the river for January-December period of each year in line with th...
Poster
The main objective is to analyze some physical-characteristics of the Șușița Catchment, such as climate, soil texture and land use type, having an impact in hydrological response of the catchment area. This analysis is useful in understanding the role of controlling factors in the hydrological processes taking place in the study area, such as sedim...
Poster
Full-text available
As part of the integrated monitoring system, monitoring of the air quality it is essential in areas where operating a cement factory, the atmosphere being the most common way of spreading pollutants derived from such industrial activity. To highlight the impact on the air of the activities that take place in the cement factory from Eastern Romania...
Poster
Full-text available
Mesoporous silica is a form of SiO2 with relatively recent use in the field of nanomaterials for environmental protection. Given the hexagonal mesoporous silica arrangement, characterized by a high specific surface, as well as very well defined shapes and dimensions of its pores, the interest in its absorbent and catalytic properties has increased....
Article
Full-text available
A pozzolanic material ordinarily contains high amounts of siliceous or aluminous components, but has no cementitious property until when it reacts with calcium hydroxide, that is available in cement, in the presence of moisture. The present study evaluates the pozzolanicity of ceramic tile powder and its effect on both hydration mechanism and stren...
Article
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Accidental pollution in a hydrosystem can cause widespread damages on the environment and could endanger public health, therefore the objective of this work was to simulate and anticipate a situation of accidental pollution, in time and space. Experimental data of the analyzed area (Borcea-Bala-Old Danube), for a period of 2 years included samples...
Article
Full-text available
Evaluation of the potential environmental risk of the presence of heavy metals in surface sediments collected from lakes situated in heavily urbanized areas has been performed. Five heavy metals (Cu, Cr, Cd, Pb and Ni) were determined in sediments of urban lakes called Plumbuita and Circului Lakes, from five sampling sections S1-S5, to assess the r...
Article
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The topic of this paper is part of the current concerns to reduce the impact of pollutants on the aquatic environment by chemical treatment of wastewater in the context of sustainable development for improving quality of life. Suspended solids can lead to deposition of sludge and the occurrence of anaerobic fermentation with negative effects on the...