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.