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1

Zdolności sorpcyjne węgla brunatnego w stosunku do wybranych barwników kwasowych

Kyzioł-Komosińska J., Dzieniszewska A., Krzyżewska I.

Przemysł Chemiczny

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2014

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T. 93, nr 5

657-661

PL

Przedstawiono właściwości sorpcyjne węgla brunatnego pochodzącego z KWB Bełchatów w stosunku do wybranych barwników kwasowych (Acid Red 18, Acid Black 1, Acid Blue 9 oraz Acid Green 16) w roztworach wodnych. Wyznaczona w statycznych warunkach kontaktu faza stała-roztwór maksymalna pojemność sorpcyjna węgla w stosunku do wybranych barwników kwasowych mieściła się w zakresie 3,80-22,7 g/kg i rosła w szeregu AR-182). W wiązaniu barwników AR-18, AB-9 i ABk-1 odgrywała rolę adsorpcja jonowymienna (E>8 kJ/mol), przy czym jej udział w wiązaniu barwników był największy dla AR-18.

EN

Four acid dyes were adsorbed on lignite (porosity 0.6335) from aq. solns. at initial concns. 1-1000 mg/L under static conditions. The lignite was an efficient sorbent (capacity 3.8-22.7 g/kg). The process was successfully described by Langmuir, Freundlich and Dubinin-Radushkevich isotherm equations.

2

Zastosowanie kompostu jako taniego sorbentu do usuwania barwników z roztworów wodnych

Jóźwiak T., Filipkowska U., Rodziewicz J., Mielcarek A., Owczarkowska D.

Rocznik Ochrona Środowiska

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2013

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Tom 15, cz. 3

2398--2411

EN

This study was aimed at determining the feasibility of using compost as an unconventional sorbent for dyes removal from aqueous solutions. Compost applied in the study was a product of sewage sludge composting with plant residues (birch wood chips and rapeseed straw). Experiments were conducted for two anionic reactive dyes: Reactive Yellow 84 [RY84] (1701 g/mol – λmax = 357.5 nm) and Reactive Black 5 [RB5] (991 g/mol – λmax = 600.0 nm), and for two cationic dyes: Basic Green 4 [BG4] (365 g/mol – λmax = 618.0 nm) and Basic Violet 10 [BV10] (479 g/mol – λmax = 547.5 nm). The scope of the study included: determination of the optimal pH value of dyes adsorption onto compost, determination of equilibrium time of dyes sorption onto compost, determination of the maximum sorption capacity of the analyzed dyes on compost. During each experiment, sorbent concentration in the solution was at 5 g d.m./dm3. The concentration of dye remaining in the solution was determined with the spectrophotometric method on a UV-VIS SP 2000 spectrophotometer. Analyses were conducted at a room temperature – T = 22°C. The pH value of solutions was adjusted with aqueous solutions of HCl and NaOH. Sorption of the anionic reactive dyes RY84 and RB5 was the most effective at pH = 3. The optimal pH value of cationic dyes sorption was established at pH = 5. At a high pH value (pH = 9), the sorption of each type of dye was impaired due to partial solubilization of the compost sorbent. The equilibrium time of dyes sorption on compost accounted for 180 min in the case of RY84, RB5 and BG4, and for 240 min in the case of BV10 – 240 min. Analyses of the maximum sorption capacity of the selected dyes on compost were carried out already after establishing the optimal pH value of the sorption process for each dye. Results obtained were described with the use of two sorption models: a heterogenous Langmuir 2 model (double Langmuir equation), and a heterogenousFreundlich model. The Langmuir 2 model showed the best fit to experimental data (R2> 0.99). Due to the presence of functional groups -COOH and -OH, compost is negatively charged in aqueous solutions owing to which it prefers compounds with a positive charge (cationic dyes) during sorption. Electrostatic repulsion significantly impairs the adsorption of anionic dyes. The maximum sorption capacity of compost in the case of RY84 and RB5 reached 2.15 mg/g d.m. and 4.79 mg/g d.m., whereas in the case of BG4 and BV10 – 26.41 mg/g d.m. and 27.20 mg/g d.m., respectively. Results of the maximum sorption capacity of dyes on compost were referred to results obtained with other unconventional and cheap sorbents.

3

Zastosowanie jonitów, membran jonowymiennych, sorbentów polimerowych oraz biopolimerów w procesie usuwania barwników kwasowych i reaktywnych z roztworów wodnych

Greluk M.

Przemysł Chemiczny

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2013

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T. 92, nr 4

469-478

4

Langmuir isotherm models applied to the sorption of acid dyes from effluent onto polyamide nanofibers

Wang Y., Wiener J., Zhu G.

Autex Research Journal

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2013

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Vol. 13, no. 3

95--98

EN

The ability of polyamide 6 nanofibers membrane (P6NM) to remove acid dyes from effluent solution by adsorption has been studied. Equilibrium isotherms for the adsorption of three acid dyes, Acid blue 41 (AB41), Acid blue 78 (AB78), and Acid yellow 42 (AY42), on P6NM were measured experimentally. Simulated wastewater of acid dyes with the concentration of 10 mg/L for sorption process electrospun polyamide 6 with mass per unit area 12 g/m2 was used as the sorbent material. Ten sets of P6NM were dipped in separate simulated effluent. The weight of the original P6NM and the concentration of left solution were detected. Results were analyzed by the Langmuir equation using a linearized correlation coefficient. And it showed that all the dyes tested could follow the Langmuir adsorption isotherm, which gave excellent correlation for all the dyes.

5

Sorption of the acid dyes onto strongly basic anion exchanger: Kinetic and equilibrium studies

Greluk M., Hubicki Z., Wołowicz A.

Challenges of Modern Technology

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2011

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Vol. 2, no. 1

74--78

EN

The strong base acrylic anion exchangers, Amberlite IRA-458, was used as an adsorbent for the investigation of acid dyes (Acid Orange 7, Acid Orange 10 and Acid Red 88) adsorption kinetics and isotherms. The pseudo-fi rst order and pseudo-second order kinetic models were used to analyze the kinetic data and good agreement between the experimental and calculated amounts of dye adsorbed at equilibrium were obtained for the pseudo-second order kinetic models for the entire investigated concentrations domain in the case all three investigated dyes. The adsorption equilibrium data were analyzed by the Langmuir and Freundlich isotherm models with the best fitting being the first one.

6

Compost as biosorbent for removal of acid dyes from the wastewater generated by the textile industry

Kyzioł-Komosińska J., Rosik-Dulewska Cz., Dzieniszewska A., Pająk M.

Archives of Environmental Protection

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2011

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Vol. 37, no. 4

3-14

EN

The compost derived from cellulosic material coming from the Public Utility Company in Zabrze (Poland) was investigated for its capability for adsorbing acid dyes from aqueous solution at various concentrations of the dyes and the compost dosages. Four acid dyes were investigated: Acid Red 18 (AR-18), Acid Blue 9 (AB-9), Acid Green 16 (AG-16) and Acid Black 1 (ABk-1). The adsorption isotherms were determined by comparing the experimental data with the isotherm models (Freundlich, Langmuir and Dubinin–Radushkevich models). The sorption capacity of the compost depended on the initial concentrations of dyes in the solution, compost dosage, and on the structure of dyes. The maximum sorption capacities of the compost for adsorbing particular dyes may be ordered as follows: ABk-1 > AG-16 > AB-9 > AR-18. The amounts of bound and the percentages of removed acid dyes from effluent depended on the adsorbent dosage. The growth of the dye removal percentages with growing adsorbent mass may be attributed to the growth of the adsorbent uptake surface with growth of the adsorbent mass. The dyes were bound onto the surface of compost through the electrostatic interaction between the surface (negatively charged at pH > pHPZC) and the dye cations (AG-16), and/or through the hydrogen bond between the functional groups of the humic matter in compost (–OH, –COOH) and the functional surface groups of AR-18, AB-9 and ABk-1 dyes (–OH, –NH2). At the experiment conditions, the Freundlich and Dubinin-Raduskevich adsorption isotherm models fitted the equilibrium data very well (much better than the Langmuir one). The values of 1/n in the Freundlich equation and E in the Dubinin-Raduskevich one indicate the favourable adsorption. The studied compost may be used as a low-cost sorbent for the removal of acid dyes from wastewater released by textile industries. However, elevated values of chemical oxygen demand (COD) in the final solutions may enhance the solubility of humic compounds.

PL

W pracy przedstawiono wyniki badań sorpcji wybranych barwników kwasowych: Acid Red 18 (AR-18), Acid Blue 9 (AB-9), Acid Green 16 (AG-16) i Acid Black 1 (ABk-1) na kompoście wytwarzanym w Miejskim Zakładzie Gospodarki Komunalnej. Określono wpływ zarówno stężenia barwników w roztworze, jak i masy kompostu na pojemność sorpcyjną badanego kompostu. Badania przeprowadzono w statycznych warunkach kontaktu faza stała roztwór (metoda batch) dla stężeń barwników 1–1000 mg.L-1. Badany kompost wykazywał wysoką pojemność sorpcyjną w stosunku do barwników kwasowych. Pojemność sorpcyjna badanego kompostu w stosunku do barwników zmieniała się w szeregu: ABk-1 > AG-16 > AB-9 > AR-18. Zdolność ich usuwania zależała od stężenia zawiesiny kompostu w roztworze i od stężenia barwników. Najwyższą skuteczność usuwania barwników stwierdzono dla stężenia zawiesiny 50 g.L-1 i stężenia barwników w roztworze 1–50 mg.L-1. Stwierdzono, że barwniki kwasowe były wiązane na powierzchni cząstek kompostu w wyniku oddziaływań elektrostatycznych między ujemnie naładowaną powierzchnią kompostu a kationami barwnika (AG-16) i/ lub poprzez wiązania wodorowe wytworzone między grupami funkcyjnymi kwasów humusowych obecnych w kompoście (–OH, –COOH) i grupami funkcyjnymi barwników (–OH, –NH2). Wyniki badań doświadczalnych najlepiej opisywały równania izoterm Freundlicha i Dubinina-Raduskevicha a oszacowane parametry w równaniach wskazywały na adsorpcję. Na podstawie przeprowadzonych badań stwierdzono, że badany kompost może być brany pod uwagę jako skuteczny i ekonomiczny sorbent barwników kwasowych, jednak nie należy zapominać o wzroście wartości ChZT w oczyszczanych ściekach w wyniku rozpuszczania kwasów huminowych obecnych w kompoście.

7

The influence of acid dyes upon some structural and physico-mechanical indices of polyamide fibres

Nedkova M., Pavlov P., Pishev D.

Autex Research Journal

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2005

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Vol. 5, no. 3

162--175

EN

The influence of three acid dyes upon some physico-mechanical indices of polyamide multifilament yarn has been studied as a consequence of the structure modifications which occur during the dyeing process. It has been established that, irrespective of the differences in the chemical composition of the dyes, the modifications in the properties of the samples used are quite similar. Some structural characteristics, tenacity and elongation at break, crease resistance and the critical time of dissolution, have been determined. The dependencies of the indices listed on the dye concentration are of a complex character, which reflects the gradual penetration of the dye molecules into the inter-fibrillar and intra-fibrillar amorphous areas of the structure which are different in solidity. The fluctuations in the course of the dependencies in the area of the lowest concentrations are the result of the combined influence of the processes of improvement of the crystal phase and the relaxation phenomena, occurring in the most accessible amorphous areas of the fibrous structure. With the increase in the dye concentration, the so-called 'cross-linking effect' starts to appear, as a result of the formation of inter-molecular links of the polymer-dye-polymer type, which influence the properties under investigation in a characteristic way. The increase in the dye presence in the substrate provokes the repeated alternation of the above-mentioned phenomena in the thicker amorphous areas of the samples, with a pronounced influence of the 'cross-linking effect' in the highest concentrations.

8

Examination of Tenside Influence on Dyeing Kinetics of Polyamide Fibres with Acid Dyes

Ristic N.

Fibres & Textiles in Eastern Europe

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2002

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Vol. 8, no. 1 (36)

85--87

EN

The polyamide-acid dye system is characterised by rapid dye adsorption immediately after the fibre is soaked into the dye solution, which frequently causes uneven colouration. In practice, for that reason, in dyeing systems the dyebath often contains auxiliary levelling agents of various composition, the basic component of which is surfactant-tenside. This paper examines the influence of non-ionic ten-sides of various hydrophylic values and of anionic tenside on acid dye exhaustion and diffusion into a PA 6 fibre. It was demonstrated that the presence of tensides changed the dyeing kinetics of the examined system, in the sense of retardation.

PL

Metoda barwienia poliamidów za pomocą barwników kwasowych charakteryzuje się szybką adsorpcją barwnika, bezpośrednio po zanurzeniu włókna w roztworze barwiarskim. Powoduje to często nierównomierne wybarwienie. Z tego powodu przy stosowaniu tej metody w praktyce dodaje się często do kąpieli barwiarskiej środki pomocnicze, w postaci dodatków wyrównujących o różnym składzie. Podstawowymi składnikami tych dodatków są środki powierzchniowo-czynne. W artykule opisano badania nad wpływem anionowych i niejonowych środków powierzchniowo-czynnych o różnej hydrofilowości na wyczerpywanie się barwników kwasowych z kąpieli i ich dyfuzję do włókien PA 6. Stwierdzono, że obecność środków powierzchniowo-czynnych w kąpieli barwiarskiej zmienia kinetykę barwienia. W przypadku badanych zestawów włókno-barwnik opóźnia proces barwienia.