2019, Volume 65(69), Issue 2 (June)
Contents
pages 1- 8 Download
Emulsions Based on Rosemary Essential Oil – Beeswax System Used in Manufacturing of Value – Added Textiles for Skin Care Benefits
CARMEN ZAHARIA, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
czah@ch.tuiasi.ro
ANGELA DĂNILĂ, "Gheorghe Asachi" Technical University of
Iași, Romania, Faculty of Textiles, Leather and Industrial Management
EMIL IOAN MUREȘAN, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
DANIELA ȘUTEU, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
pages 9 - 20 Download
Abstract
This work presents briefly the preparation methodology of nine
emulsions based on beeswax - rosemary essential oil system (iR,
i=1…9) and its specific quality characteristics, representatives being
emulsions 3R, 4R, 8R and 9R in
manufacturing of value - added textiles for aromatherapy and skin care
benefits. These prepared emulsions were preliminarily characterized by some
specific physical-chemical properties and quality indicators (i.e.
pH, absolute density, acidity index, peroxide index, content of conjugated
dienes and trienes, total content of polyphenols and flavonoids) as well as
sensory analysis which was permitted the recommendation of the most
indicated emulsion to be used by a Romanian textiles manufacturer in order
to add value to its textile products, considering emulsions in-time
stability (after 1 and 8 months of storage at room temperature) and its
potential antibacterial action after textile impregnation. This work
underlines also that the most recommendable emulsion is 4R emulsion
followed by 8R emulsion, both having a relative good in-time
stability till the separation of organic and aqueous phases as well as a
satisfactory content of polyphenols and flavonoids.
Keywords:
added-value textile material; emulsion; in-time stability; physical-chemical
quality indicators; skin care benefit; textile impregnation.
Separation of Waste Industrial Gases with Magnesium
IOAN BARABULICĂ, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ioan.barabulica@tuiasi.ro
IOAN MĂMĂLIGĂ, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
pages 21 - 35 Download
Abstract
The metallic magnesium is a material with an interesting mix
of properties which makes it attractive for research area and is often found
in nature, but in a more scattered way. The disadvantages of using magnesium
came from its costs and its danger presented by the high reactivity with
gases closer to the melting point. The expensiveness of magnesium came from
the high energy intake to extract the metal from magnesium row materials
existed in nature. Over time and related to new technological development
magnesium has become a very useful material either in an elementary state or
in bind state, the fact that put pressure on optimizing production
technologies. This study uses the property to react with gases of magnesium
for some industrial applications and came with a few ideas of research
directions that can lead to energy savings, optimizing of some existent
technologies and brigs its contribution in some environmental issues.
KKeywords: magnesium; nitrogen; carbon dioxide; magnesium nitride; reactions.
The Advantages of The Households Preservation for Vegetables and Fruits
CLAUDIA COBZARU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
CLAUDIA FELICIA CHIHALĂU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection
CORINA CERNĂTESCU, "Gheorghe Asachi" Technical University
of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
ccernatescu@yahoo.com
pages 37 - 44 Download
Abstract
This study presents the benefits of preserving vegetables and
fruits in households. Experimental data show that, compared to industrially
preserved food, the products preserved in households have the advantages of
simple preparation methods, without adding additives but having the same
shelf life as industrial cans or maybe even longer and that can be obtained
after a personal recipe.
Keywords: industrial conservation vs.
preservation in households; vegetables; fruits; canned vegetables; canned
fruits.
Tailoring Photocatalysts Nanoarchitectonics for Degrading Industrial Dyes
DIANA GÎLEA, "Gheorghe Asachi" Technical University of
Iași, Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection
SOFRONIA DRANCA, "Gheorghe
Asachi" Technical University of Iași, Romania, "Cristofor Simionescu"
Faculty of Chemical Engineering and Environmental Protection
GABRIELA CÂRJĂ, "Gheorghe Asachi" Technical University of Iași,
Romania, "Cristofor Simionescu" Faculty of Chemical Engineering and
Environmental Protection,
gcarja@ch.tuiasi.ro
pages 45 - 54 Download
Abstract
In this work we report novel photocatalysts based on Zn -
based layered double hydroxides (LDHs), as active photocatalysts for
degrading the following industrial dyes: drimaren red (DR), drimaren navy
(DN) and nylosan (NYL). X-ray diffraction (XRD), IR spectroscopy (FTIR), and
UV–vis analyses were used to investigate the structure, composition and
photoresponsive features of the catalysts. The catalysts photoefficiency was
analyzed by UV–vis following the absorbance (A) at 283 nm, 277 nm and 567 nm
characteristic to DR, DN and NYL, respectively. The results point out that
the studied LDHs present high photocatalytic activity for the degradation of
the dyes; such that the maximum photocatalytic efficiency was about 80%. The
catalytic performances of ZnAlLDH and the derived mixed oxides are a
function of the specific composition of the clay.
Keywords: layered
double hydroxides; industrial dyes; photocatalysts; environmental catalysis.
Rapid and Simple Method for The Preparation of Iron Nanoparticles Functionalized with Alginate and Their Use as Adsorbent
ALINA-ROXANA LUCACI, "Gheorghe Asachi" Technical
University of Iași, Romania, "Cristofor Simionescu" Faculty of Chemical
Engineering and Environmental Protection
LAURA BULGARIU,
"Gheorghe Asachi" Technical University of Iași, Romania, "Cristofor
Simionescu" Faculty of Chemical Engineering and Environmental Protection,
lbulg@ch.tuiasi.ro
pages 55 - 64 Download
Abstract. In recent years, the use of iron nanoparticles in absorption
processes has been considered promising alternative to traditional methods,
due to the numerous advantages. The most important advantage is that iron
nanoparticles can be easily functionalized with various organic compounds
and thus their adsorbent performance can be improved. In this study, an easy
and simple method was used for the preparation of iron nanoparticles
functionalized with alginate (Fe-NPs-Alg), and the adsorbent performances of
the obtained material were tested for the removal of Cu(II) ions from an
aqueous solution.The batch absorption experiments were performed as a
function of initial Cu(II) ions concentration and contact time, at constant
initial solution pH of 4.4, adsorbent dose (2.0 g/L) and room temperature
(25 ± 1°C). The adsorption experiments showed that the Cu(II) ions
adsorption on Fe-NPs-Alg reaches the equilibrium in maximum 120 min, and the
maximum adsorption capacity is 36.53 mg/g. The results have indicate that
Fe-NPs-Alg have good adsorptive characteristics and can be used for the
removal of heavy metal ions from aqueous solution.
Keywords: iron
nanoparticles; alginate; functionalization; Cu(II) ions adsorption; aqueous
media.