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1.
Fotokemijska razgradnja barvila ob prisotnosti manganovega kompleksa vezanega na celulozo
Katja Ribič, 2019, magistrsko delo

Opis: V magistrski nalogi je obravnanvana problematika fotokemijske razgradnje barvila Reactive Blue 4. Fotokemijsko razgradnjo smo izvajali z naprednim oksidacijskim postopkom UV/H2O2 - ob prisotnosti manganovega kompleksa (MnTACN) vezanega na celulozni nosilec. Glavni namen tega postopka je bil, da smo v čim krajšem času dosegli razbarvanje barvila ob dodatku celulozne tkanine, na katero smo predhodno na različne načine vezali MnTACN. Za vzorec tkanine obdelan s kompleksom MnTACN pri katerem smo dosegli najboljše rezultate razbarvanje smo izvedli še ponovljivost razbarvanja. Izvedli smo tudi izračun stroškov AOP postopka.
Ključne besede: manganov kompleks MnTACN, fokokemijska razgradnja UV/H2O2, barvilo Reactive Blue 4, nosilec tkanina, razbarvanje.
Objavljeno: 09.12.2019; Ogledov: 347; Prenosov: 38
.pdf Celotno besedilo (3,00 MB)

2.
Uporaba naprednih oksidacijskih postopkov za razbarvanje odpadnih voda
Nejc Lebar, 2019, diplomsko delo

Opis: Industrija je največji porabnik vode in hkrati največji proizvajalec odpadnih vod. Odpadne vode iz industrije vsebujejo kompleksne snovi, ki jih v konvencionalnih čistilnih napravah ni mogoče odstraniti. Za potrebe odstranjevanja takšnih snovi se razvijajo naprednejši postopki čiščenja. V diplomski nalogi smo se osredotočili na čiščenje obarvanih odpadnih vod v tekstilni industriji. Za razbarvanje teh smo uporabili napredni oksidacijski postopek (AOP) H_2 O_2/UV. Izbrali smo tri barvila, ki se pogosto uporabljajo v tekstilni industriji, in sicer C. I. Acid Red 374, C. I. Reactive Black 5 in C. I. Direct Red 80. Proučili smo vpliv moči UV-sevanja na samo hitrost in učinkovitost razgradnje barvil ter spremljali spremembe parametrov onesnaženja.
Ključne besede: napredni oksidacijski postopek, vodikov peroksid, razbarvanje, C. I. Acid Red 374, C. I. Reactive Black 5, C. I. Direct Red 80
Objavljeno: 06.05.2019; Ogledov: 376; Prenosov: 53
.pdf Celotno besedilo (2,41 MB)

3.
4.
Decolorization and mineralization of reactive dyes, by the $H_2O_2$/UV process with electrochemically produced $H_2O_2$
Tina Jerič, Roel J. M. Bisselink, Willy Van Tongeren, Alenka Majcen Le Marechal, 2013, izvirni znanstveni članek

Opis: Decolorization of Reactive Red 238, Reactive Orange 16, Reactive Black 5 and Reactive Blue 4 was studied in the UV/$H_2O_2$ process with $H_2O_2$ being produced electrochemically. The experimental results show that decolorization increased considerably when switching on the electrochemical production of $H_2O_2$. Complete decolorization (>99%) was achieved for all dyes under the applied experimental conditions, partial mineralization (49-85%) was obtained, which depends on the type of dye. Reactive Red 238 was used to investigate operational parameters and it was found that decolorization was influenced by the applied electrical current of the electrochemical cell and flow rate. Decolorization and mineralization of Reactive Red 238 can be described by pseudo-first order kinetics. It was found that the initial concentration of Reactive Red 238 has a negative influence on the pseudo-firstorder reaction constant.
Ključne besede: decolorization, hydrogen peroxide, reactive dyes, in-situ $H_2O_2$, AOP, Reactive Red 238
Objavljeno: 10.07.2015; Ogledov: 869; Prenosov: 46
.pdf Celotno besedilo (195,10 KB)
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5.
Reactive dye decolorization using combined ultrasound/H2O2
Darinka Brodnjak-Vončina, Alenka Majcen Le Marechal, 2003, izvirni znanstveni članek

Opis: The decolorization of six vinylsulphone reactive dyes (C.I. Reactive Yellow 15, C.I. Reactive Red 22, C.I. Reactive Blue 28, Remazol Dark Black N 150%, C.I. Reactive Blue 220 and C.I. Reactive Black 5) in aqueous solution was investigated using ultrasound and ultrasoundž hydrogen peroxide degradation. Two different concentration levels of hydrogen peroxide were used. The efficiency of the decolorization was evaluated by measuring the absorbance of the dye solutions. The results show that ultrasound treatment was significantly enhanced in the presence of H2O2.
Ključne besede: ultrasonic irradiation, decolorization, oxidation processes, hydrogen peroxide, reactive dyes, vinylsulphone reactive dyes
Objavljeno: 01.06.2012; Ogledov: 1426; Prenosov: 72
URL Povezava na celotno besedilo

6.
Comparison of H2O2/UV, H2O2/O3 and H2O2/Fe2+ processes for the decolorisation of vinylsulphone reactive dyes
Tanja Kurbus, Alenka Majcen Le Marechal, Darinka Brodnjak-Vončina, 2003, izvirni znanstveni članek

Opis: Six vinylsulphone reactive dyes were decolorised using three oxidation processes (H2O2/UV, H2O2/O3 and H2O2/Fe2+). The efficiency of decolorisation was measured by decolorisation time, absorbance, COD and TOC and the three methods of decolorisation are compared.
Ključne besede: textile reactive dyes, vinylsulphone dyes, decolorisation, hydrogen peroxide, UV irradiation, ozone, Fenton's reagent, pollution parameters, experimental design
Objavljeno: 01.06.2012; Ogledov: 1491; Prenosov: 88
URL Povezava na celotno besedilo

7.
The removal of reactive dye printing compounds using nanofiltration
Irena Petrinić, Niels Peder Raj Andersen, Sonja Šostar-Turk, Alenka Majcen Le Marechal, 2007, izvirni znanstveni članek

Opis: A synthetically prepared reactive dye print wastewater, mimicking real wastewater obtained from a local textile mill, was treated by nanofiltration using an NFT-50 membrane in a plate and frame module configuration at different cross-flow velocities (0.4, 0.6 and 0.8 m/s) and pressures (2-15 bar). The nanofiltration membrane was evaluated for membrane fouling, permeate flux and its suitability for removing colour, conductivity, Na+ ions and COD as a function of operating pressure and feed concentration. The permeate separation efficiency was monitored by measuring the removal efficiency of colour, conductivity, Na+ ions and COD retention. The membrane achieved high dye retention for each of the four dyes (from 99.4 to 99.9%) and electrolytes used (63-73%). The retention of organic substances varied between 20 and 50%, depending on the pressure used; higher retentions were achieved at higher pressure and by using higher cross-flow velocities.
Ključne besede: nanofiltration, nanofitration membranes, wastewater after reactive printing, reactive dye, concentration polarization
Objavljeno: 01.06.2012; Ogledov: 1341; Prenosov: 77
URL Povezava na celotno besedilo

8.
Residual dyebath purification using a system of constructed wetland
Alenka Ojstršek, Darinka Fakin, Danijel Vrhovšek, 2007, izvirni znanstveni članek

Opis: A constructed wetland model, comprising two different substrate mixtures, was used to purify textile dyebath wastewater. Three laboratory prepared wastewaters containing three commercial dyes of different classes and chemicalconstitution (one vat and two reactive dyes), different chemicals (NaOH, NaCl) and auxiliaries (migration inhibitor, sequestering, defoaming andwetting agents) were employed. Purifying efficiency was verified by measuring pollution parameters, such as absorbance, pH, total organic carbon (TOC), chemical oxygen demand (COD) and electrical conductivity (EC). It was found that the constructed wetland model reduced dye concentration by up to 70%, lowered the TOC and COD values up to 88%, electrical conductivity up to 60% and pH from 12 to 7.6.
Ključne besede: textile dyeing, reactive dyes, vat dyes, wastewater treatment, constructed wetland model, biological treatment, purification
Objavljeno: 01.06.2012; Ogledov: 1475; Prenosov: 73
URL Povezava na celotno besedilo

9.
Case study of the sonochemical decolouration of textile azo dye Reactive Black 5
Simona Vajnhandl, Alenka Majcen Le Marechal, 2007, izvirni znanstveni članek

Opis: The decolouration and mineralization of reactive dye C.I. Reactive Black 5, a well-known representative of non-biodegradable azo dyes, by means of ultrasonic irradiation at 20, 279 and 817 kHz has been investigated with emphasis on the effect of various parameters on decolouration and degradation efficiency. Characterization of the used ultrasound systems was performed using calorimetric measurements and oxidative species monitoring using Fricke and iodine dosimeter. Experiments were carried out with low frequency probe type, and a high-frequency plate type transducer at 50, 100 and 150 W of acoustic power and within the 5-300 mgžL initial dye concentration range. Decolouration, as well as radical production, increased with increasing frequency, acoustic power, and irradiation time. Any increase in initial dye concentration results in decreased decolouration rates. Sonochemical decolouration was substantially depressed by the addition of 2-methyl-2-propanol as a radical scavenger, which suggests radical-induced reactions in the solution. Acute toxicity to marine bacteria Vibrio fischeri was tested before and after ultrasound irradiation. Under the conditions employed in this study, no toxic compounds were detected after 6 h of irradiation. Mineralization of the dye was followed by TOC measurements. Relatively low degradation efficiency (50% after 6 h of treatment) indicates that ultrasound is rather inefficient in overall degradation, when used alone.
Ključne besede: textile industry, wastewater treatment, textile dyeing, reactive dyes, azo dyes, decoloration, ultrasound, degradation, decoloration kinetics, oxidizing species
Objavljeno: 01.06.2012; Ogledov: 1521; Prenosov: 73
URL Povezava na celotno besedilo

10.
Efficiency of the coagulation/flocculation method for the treatment of dyebath effluents
Vera Golob, Aleksandra Vinder, Marjana Simonič, 2005, izvirni znanstveni članek

Opis: Textile dyeing processes are among the most environment-unfriendly industrial processes, because they produce coloured wastewaters that are heavily polluted with dyes, textile auxiliaries and chemicals. The coagulation/flocculation method was studied as a wastewater treatment technique for the decolourization of residual dyebath effluents after dyeing cotton/polyamide blends using reactive and acid dyes. It was discovered that acombination of aluminium sulphate and a cationic organic flocculant yields an effective treatment for residual dyebath wastewaters since almost complete decolourization was achieved, TOC, COD, AOX, BOD and the anionic surfactants were reduced and the biodegradability was increased.
Ključne besede: textile industry, reactive dyes, acid dyes, wastewater, čiščenje odpadnih vodwastewater treatment, flocculation, coagulation, ecological analyses, wastewater decoloration, Jar-tests
Objavljeno: 01.06.2012; Ogledov: 1710; Prenosov: 79
URL Povezava na celotno besedilo

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