Lucia Dumitrescu

Transylvania University of Brașov

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Ileana Manciulea

Transylvania University of Brașov

Anca Sauciuc

Fundaţia pentru Formare Profesională şi Învăţământ Preuniversitar - Viitor

Claudia Zaha

Transylvania University of Brașov

Eugenia Comăniţá

Gheorghe Asachi Technical University of Iași

Cristina Bogatu

Transylvania University of Brașov

Camelia Drăghici

Transylvania University of Brașov

Gheorghe Roman

Institutul de Chimie Macromoleculară Petru Poni

Hermann Hofbauer

BEST - Bioenergy and Sustainable Technologies (Austria)

Anca Duţă

Transylvania University of Brașov

Rodica Tica

Transylvania University of Brașov

Cooperative Institutions

Transylvania University of Brașov

Gheorghe Asachi Technical University of Iași

University of Bucharest

Iuliu Hațieganu University of Medicine and Pharmacy

Romanian Academy

Universitatea Națională de Știință și Tehnologie Politehnica București

Babeș-Bolyai University

National Institute for Research and Development in Microtechnologies

Institute for Research and Development

Institutul de Chimie Macromoleculară Petru Poni

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Cu2+ REMOVAL FROM WASTEWATERS BY USING COMPOST AS SORBENT

Environmental Engineering and Management Journal (2017)

Camelia Drăghici Ileana Manciulea Cristina Bogatu Lucia Dumitrescu

The paper aims to present the sorption properties of two sorbent substrates (composts) prepared by aerobic fermentation from vegetables waste composted with beech sawdust (BR2) and beech ash (BC1) to be used for Cu 2+ removal from wastewaters.The composts structures and surface properties were characterised in terms of active groups (FTIR), crystallinity (XRD), morphology (SEM), topography (AFM) and specific surface and pores analysis (BET), and the changes in properties after Cu 2+ sorption were outlined.Kinetic studies of the copper sorption were performed and the equilibrium time was determined, kinetic models have been applied to describe the sorption process.The pseudo second order kinetic model proved to be valid for both composts.The sorption parameters (pH, substrate dose, initial concentration) were optimized at the equilibrium time and the isotherms were plotted.The sorption capacities and removal efficiencies were discussed in direct relation with the structure, morphology, surface properties (specific surface, surface charge) of the composts.Langmuir and Freundlich models were used to fit the experimental data and sorption mechanisms were proposed.The Langmuir model is not able to describe the copper ions sorption on the two composts; better correlation coefficients are obtained when the Freundlich model is applied, specific for heterogeneous substrates.BR2 substrate is most likely able to support unspecific physical interactions, while parallel mechanisms also involving chemisorption are more probable for BC1.The results prove the sorption of copper ions onto compost type substrates can be used as an efficient step in the advanced wastewaters treatment.

10.30638/eemj.2017.079

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Microscopic Analyze of Insoles Composite Structures Behavior under Water Immersion, Temperature Variation and Saline

Applied Mechanics and Materials (2015)

Mihaela Baritz Laura Diana Cotoros Lucia Dumitrescu

A number of issues related to composite structure analysis of variants of insoles, commonly used for getting comfortable wearing or improvement of posture deficiencies are presented in this research paper. In the first part of a paper some variants of biomechanical system consisting of composite structures - namely foot and insoles variants undergo analysis are presented and analyzed. This study aims to determine how these insoles react to the effect of temperature and humidity parameters during different time period. In the second part of the paper the experimental system and how to choose the group of samples analyzed are presented. The results and conclusions obtained from this study and the establishing the structural changes, evidenced by microscopic analysis are analyzed in the final part of the paper.

Immersion

Variation (astronomy)

Physiological saline

10.4028/www.scientific.net/amm.760.287

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Research concerning the influence of some micro and nano-materials on the wood based product finishing quality in sustainable development conditions

International Conference on Nanotechnology (2009)

Loredana Anne-Marie Badescu Lucia Dumitrescu Daniela Mihalevschi

The authors propose the use of some new hybrid technological materials (organic-inorganic) for finishing of wooden materials, in order to correspond to the concepts of sustainable development, in accordance to European Directives for implementation of Sustainable Development Strategy. Research presents, in a better determinable way, the positive influence of these water based, eco-materials, upon the quality of wood industry finishing products, from technical, aesthetical and environmental protection point of view. In the study are promoted methods and techniques for a high scientific performance investigation, for analyzing and spotting the properties of the new lacquers, based on the proposed micro and nano-materials.

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RECYCLED BIOMASS WASTE AS COPOLYMERIZATION PARTNERS

Claudia Zaha Lucia Dumitrescu Anca Sauciuc

Taking into account the main demand regarding the environmental protection and the need for wood preservation, our research has been focused on the developing of some new chemical agents for wood preservation, based on acrylic copolymers and lignosulfonates, biomass waste, generated as by-products of chemical wood pulping. Because the lignosulfonates posses a reactive chemical potential, evidenced by presence in their structure of some functional groups, they have been used as reactive comonomers in water emulsion copolymerization of acrylic comonomers. Having in view the biocide activity of acrylic comonomers and of lignosulfonates, the obtained copolymers were biologically investigated and proposed as ecological wood preservatives.

Lignosulfonates

Biocide

Reactive dye

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REDUCING THE ENVIRONMENT HAZARD USING THE LIGNOSULFONATES AS COPOLYMERIZATION PARTNERS

Environmental Engineering and Management Journal (2002)

Lucia Dumitrescu Valeriu Petrovici Rodica Tica Ileana Manciulea

Taking into account the main demand regarding the environment protection and the need for wood preservation, our research has been focused on the developing of some new chemical agents for wood preservation, based on acrylic copolymers and metal complexed lignosulfonates.Some aspects of the emulsion copolymerization of the acrylic comonomers (ethyl acrylate, butyl acrylate, acrylonitrile, acrylic acid) with metal complexed lignosulfonates, as well as the biocide activity of the copolymers, put into evidence by biological testing at "National Wood Institute"-Bucharest were investigated.The possibility of obtaining of new type of wood preservatives based on the lignin derivatives should to gain a great interest in the future, regarding both the using of some raw materials as reactants for organic synthesis and the increasing need for medium protection.

Lignosulfonates

10.30638/eemj.2002.045

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POLLUTANTS DETECTION USING HAPTEN DERIVATIZATION

Environmental Engineering and Management Journal (2005)

Mihaela Badea Izabela RoxanaVoina Gheorghe Coman Lucia Dumitrescu Camelia Drăghici

The aim of this study is to test the capacity of chemicals like pesticides (carbamates, triazines) to attach to carrier molecules (bovine serum albumin) directly or intermediated by molecules such as glutaraldehyde.The resulted antigens were inoculated to rabbits for obtaining specific antiserums, used then for pesticides detection by applying immunoenzymatical methods.This approach will allow estimating and controlling the environmental pollution with pesticides, in order to detect their levels, especially the maximal limits that are admitted in the biological environment, food, air, water and soil.Using these data allows developing actions to reduce or eliminate the pollutants at the source.

Hapten

10.30638/eemj.2005.024

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NANOCOMPOSITE MATERIALS BASED ON POLYMERS AND ALUMINA NANOPARTICLES

Environmental Engineering and Management Journal (2009)

Lucia Dumitrescu Ileana Manciulea

The synergistic combination of polymers and inorganic compounds via sol-gel process has attracted great attention, by manipulating structure at molecular level, for developing new materials with desired properties.These new hybrid materials could have a controllable combination of the benefits of polymers (flexibility, toughness, ease of processing) and those of ceramics or glasses (hardness, durability, thermal stability).The microstructures and the properties of hybrid materials depend on the particle size of inorganic phase, the uniform distribution of inorganic phase within the organic phase and the interfacial force between the two phases.The paper presents research concerning the obtaining of composite coating nanomaterials consisting of an organic component (functionalized acrylic copolymers in water dispersion and aluminium lignosulfonate) and inorganic component nano aluminium oxide.The formation of a crosslinked nanometric network of inorganic and organic domains was evidenced by AFM analysis.The interphase characterization of the nanostructured materials was performed using FT-IR analysis.

Polymer nanocomposite

10.30638/eemj.2009.138

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Ecological wood coating materials based on natural and synthetic polymers.

International Conference "Wood Science and Engineering in the Third Millennium", Braşov, Romania, 7-9 November 2013. (2013)

Lucia Dumitrescu Ileana Manciulea Claudia Zaha Alina Matei

New water based eco-materials used as wood coatings were synthesized by emulsion copolymerization of acrylic esters comonomers (ethyl acrylate, butyl acrylate, acrylonitrile, acrylic acid) and styrene with lignin derivatives calcium and iron (III) lignosulfonates, as partial substitutes for styrene/acrylic monomers.The obtained water based, ecological coatings, were physical-chemical and by FTIR analysis characterized and submitted to the standard testing procedures for wood/furniture coatings. The research put into evidence that better properties of the coating films (tensile breaking strength, water absorption, resistance at cold liquids and dry/wet heat resistance) are obtained for the styrene-acrylic copolymer and acrylic copolymer with iron lignosulfonate as reaction partner.

Acrylic acid

Butyl acrylate

Chemical resistance

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Antibacterial activity and flexural strength for experimental composites with graphene

Dental Materials (2017)

Mărioara Moldovan Cristina Prejmerean Doina Prodan Lucia Dumitrescu Rahela Carpa

10.1016/j.dental.2017.08.107

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Contributions regarding the research of some new nanostructured coating materials

Physica status solidi. C, Conferences and critical reviews/Physica status solidi. C, Current topics in solid state physics (2008)

Ileana Manciulea Daniela Mihalevschi Lucia Dumitrescu

Organic-inorganic hybrid materials are very interesting for several applications thanks to their properties based on the synergistic combination of different components. The paper presents some contributions on synthesis and characterization of new coating nanomaterials based on combinations of alumina nanoparticles with functionalized acrylic polymers, that lead to the enhancement of the wood coatings properties, such as biocide activity. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Nanomaterials

Biocide

Characterization

Hybrid material

10.1002/pssc.200779419

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Citations (2)