LUCIAN PĂUNESCU, Daily Sourcing & Research SRL Bucharest, Romania,
lucianpaunescu16@gmail.com BOGDAN VALENTIN PĂUNESCU, Consitrans SA Bucharest, Romania ENIKÖ
VOLCEANOV, National University of Science and Technology “Politehnica”
Bucharest, Faculty of Engineering in Foreign Language, Bucharest, Romania,
Metallurgical Research Institute SA Bucharest, Romania
Abstract Geopolymer composite for high temperature applications was
made using masonry rubble waste resulting from building demolition (clay
brick scraps and concrete scraps). It was known that the geopolymer has an
initial fire resistance due to the inorganic network constituting its
structure, but the concern for testing and improving the mechanical strength
of this new material type exposed to high temperatures was not a research
objective until recently. Geopolymer manufacturing included traditional
by-products such as granulated metallurgical slag (predominantly) and fly
ash as alumina-silicate materials with cementitious properties as well as
the alkaline activator, in which NaOH was replaced with KOH due to its
superior thermal resistance. Results showed that compressive strength
recorded acceptable losses up to 800°C and higher at 1000°C, while flexural
strength increased at 600 and 800°C compared to reference value and
then decreased after heating to 1000°C. Keywords: geopolymer composite,
granulated slag, fly ash, clay brick, demolition waste.
DYDIMUS EFEZE NKEMAJA, University of Bamenda, Bambili, Cameroon SERGE ENAMA ETEME, University of Yaoundé 1, Laboratory of Parasitology and
Ecology, Department of Animal Biology and Physiology, Faculty of Sciences,
Cameroon ABDOURAMANE NSANGOU, University of Douala, Mechanical
Laboratory (LME), ENSET Douala, Cameroon, University of Douala, Mechanics
Laboratory, Research Group on Innovative Materials (GRMI), Cameroon FABIEN EBANDA BETENE, University of Douala, Mechanical Laboratory (LME),
ENSET Douala, Cameroon, University of Douala, Mechanics Laboratory, Research
Group on Innovative Materials (GRMI), Cameroon DOINA SIBIESCU, “Gheorghe
Asachi” Technical University of Iaşi, “Cristofor Simionescu” Faculty of
Chemical Engineering and Environmental Protection, Iaşi, Romania,
doina.sibiescu@academic.tuiasi.ro PIERRE MARCEL ANICET NOAH,
University of Douala, Mechanical Laboratory (LME), ENSET Douala, Cameroon,
University of Douala, Mechanics Laboratory, Research Group on Innovative
Materials (GRMI), Cameroon ACHILLE DÉSIRÉ BETENÉ OMGBA, University of
Douala, Mechanical Laboratory (LME), ENSET Douala, Cameroon, University of
Douala, Mechanics Laboratory, Research Group on Innovative Materials (GRMI),
Cameroon VALERY HAMBATÉ GOMDJÉ, Departments of Textile and Leather
Engineering, ENSPM, University of Maroua, Cameroon
Abstract The objective of this study is to identify the metabolites
in the extract of Sida rhombifolia fibers treated with Aloe vera gel using
colored reactions and thin-layer chromatography, following analytical
techniques. The results show that the three samples fibers not treated with
Aloe vera gel, fibers treated with Aloe vera gel, and washed treated fibers
contain flavonoids in low quantities. The first two samples also present
sterols and triterpenes in medium quantities, while the washed treated
fibers contain these in low quantities. Based on the chromatographic
profiles, it can be concluded that the untreated fibers, treated fibers, and
washed treated fibers extracts have nearly identical constituents, as the Rf
values of the different spots are the same. The UV light absorption profile
indicates the presence of chromophores responsible for this absorption,
specifically double and triple bonds, which are also confirmed by
fluorescence (π-π* transition). The different colors observed include yellow
for flavonoids, blue for triterpenes, black for alkaloids, and orange for
sterols. Looking ahead, the experiments recommended by the World Health
Organization (WHO) on the effectiveness of impregnated curtains in combating
mosquito attacks (cone test, cylinder test, and tunnel test) will be the
focus of future work. Keywords: Knitting, phytochemical, screening, Sida
rhombifolia
LAVINIA MARIA POPA, “Gheorghe Asachi” Technical University of Iași,
Faculty of Industrial Design and Business Management, Iași, Romania,
lavinia-maria.popa@student.tuiasi.ro ANTONELA CURTEZA, “Gheorghe
Asachi” Technical University of Iași, Faculty of Industrial Design and
Business Management, Iași, Romania
Abstract The concept of upcycling is an integral part of modern
fashion. It involves reusing clothing products that are no longer useful or
have reached the end of their life cycle by converting them into new,
value-added products. Because of its potential to improve environmental
efficiency, the concept has attracted widespread attention from business and
academic communities. This study highlights how academic research has been
conducted on this topic. The methodology was developed through a systematic
literature review and data analysis from the last ten years. The study
explored the distribution of papers through different approaches (year,
country, authors, methodology). This study will help academics and
researchers expand the scientific literature's scope. As a result, 102
papers were obtained from various sources such as conferences and journals.
The scope of this paper is to review the literature on this topic and to
examine how it is disseminated in the digital age. Keywords:
sustainability, review, reuse, circular economy, redesign.
LUCIAN PĂUNESCU, Daily Sourcing & Research SRL Bucharest, Romania,
lucianpaunescu16@gmail.com ENIKÖ VOLCEANOV, National University of Science and Technology
“Politehnica” Bucharest, Faculty of Engineering in Foreign Language
Bucharest, Romania, Metallurgical Research Institute SA Bucharest, Romania
Abstract The paper has tested an alternative heat-insulating
material for building construction based on wood foaming. The wood waste
chosen for this test was oak wood not used in other previous experiments
presented in the literature. The purpose of the work is to replace the
plastics currently used for the production of heat-insulating materials.
Using ground wood waste, a suitable surfactant (sodium dodecyl sulfate), and
distilled water, wet suspension was prepared, foamed by stirring and then
dried at 80°C. Thus, it was obtained an optimal specimen with excellent
heat-insulating properties (apparent density of 0.014 g·cm-3, heat
conductivity of 0.035 W·m-1·K-1). The compressive strength had a rather low
value of 715 kPa, but satisfactory for the intended purpose. By comparison
with other experimentally prepared wood foams, the oak wood foam properties
fell within the performance required by the use of the new material as a
thermal insulator in construction, being able to replace similar
polymer-based materials. Keywords: wood foam, oak wood, surfactant,
heat-insulating property, heat conductivity.
ELENA UNGUREANU, “Ion Ionescu de la Brad” Iași University of Life
Sciences, Iași, Romania BOGDAN-MARIAN TOFĂNICĂ, “Gheorghe Asachi”
Technical University of Iași, Iași, Romania,
b.m.tofanica@gmail.com OVIDIU C. UNGUREANU, “Vasile Goldiș” West University of Arad, Arad, Romania
MARIA-EMILIANA FORTUNĂ, “Petru Poni” Institute of Macromolecular
Chemistry, Iași, Romania IRINA VOLF, “Gheorghe Asachi” Technical
University of Iași, Iași, Romania VALENTIN I. POPA, “Gheorghe Asachi”
Technical University of Iași, Iași, Romania
Abstract In the context of the complex valorisation of biomass and the
absolute need to mitigate polluting sources, such as heavy metals, the
present study proposes a renewable/strategic bioresource, Sarkanda grass
(Tripidium bengalense) lignin, as a substrate for adsorption of the Cr(VI)
ions from aqueous media under static conditions. Through a synthesis of
thermodynamic, spectral, and biological considerations, the study
demonstrates the efficacy of this natural aromatic polymer. The findings
suggest potential applications in industrial wastewater treatment, offering
a sustainable alternative to existing methods. This research contributes to
the growing field of bio-based materials for environmental remediation,
highlighting the value of agricultural waste in addressing water pollution
challenges. Keywords: Sarkanda grass lignin, Tripidium bengalense,
Cr(VI) ions, adsorption, Triticum aestivum L
CONSTANTIN CÎRJAN, “Gheorghe Asachi” Technical University of Iasi,
“Cristofor Simionescu” Faculty of Chemical Engineering and Environmental
Protection, Department of Environmental Engineering and Management, Romania
DANIELA GAVRILESCU, “Gheorghe Asachi” Technical University of Iasi,
“Cristofor Simionescu” Faculty of Chemical Engineering and Environmental
Protection, Department of Environmental Engineering and Management, Romania,
daniela.gavrilescu@academic.tuiasi.ro CARMEN TEODOSIU, “Gheorghe
Asachi” Technical University of Iasi, “Cristofor Simionescu” Faculty of
Chemical Engineering and Environmental Protection, Department of
Environmental Engineering and Management, Romania
Abstract Sustainability in e-commerce is a new but significant issue
in the context of European Union's transition to a circular economy due to
the rapidly growing e-commerce market. In Romania, over 500,000 single-use
plastic or cardboard packaging materials are used daily for online
shipments. The packaging sector is one of the major consumers of virgin raw
materials. The increased use of packaging, combined with low rates of reuse
and recycling, hinders the development of a circular economy. In recent
years, the packaging industry has grown faster than the national gross
income of various countries, leading to increased CO2 emissions and other
pollutants, as well as overexploitation of natural resources, loss of
biodiversity, and pollution. To minimize the negative impact, efforts are
currently underway to develop and implement more sustainable practices in
the online commerce industry, including the use of recyclable packaging,
optimizing transportation, and promoting ecological practices. Consumers can
also play a crucial role by carefully choosing products and merchants with
environmental concerns and by adopting more responsible purchasing
practices. In this context the main objective of this study is to analyse
the management of packaging waste generated by e-commerce within the
framework of circular economy. The most important practices and trends at
international and national level are discussed and recommendations regarding
the management of packaging waste resulted from electronic commerce in
Romania are provided. Keywords: e-commerce, circular economy, packaging
waste, sustainability.