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1

Removal of textile dyes from water using cellulose aerogel

Liugė Monika, Paliulis Dainius, Kumpienė Jūratė, Paulauskienė Tatjana

Ecological Chemistry and Engineering. S

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2024

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Vol. 31, nr 1

49--62

EN

In this study, removal of textile dyes from artificially contaminated water was investigated using sorbent synthesised from cardboard waste. Aerogel - lightweight adsorbent - a material with a low density and large surface area. Aerogels obtained from cellulose, chitosan, lignin or pectin have good adsorption properties for removing organic pollutants from wastewater. The aim of this study was to determine the adsorption efficiency of naphthol green B, congo red, methylene blue and rhodamine B from artificially contaminated water using sorbent synthesised from cardboard waste. The mass of the cellulose aerogel (5 mas. %) adsorbents, that were used in the experiments varied from 1.6 g to 2.74 g. The optimal adsorption conditions were determined as pH = 6.0, concentration of dyes - 10 mg L–1 and 18.0 °C -19.0 °C temperature. Under the optimal conditions, the maximum removal efficiency of naphthol green B using aerogel was 16.45 %; congo red - 98.44 %; methylene blue 79.28 %; and rhodamine B - 52.44 %.

2

Comparison of bomaplex blue CR-L removal by adsorption using raw and activated pumpkin seed shells

İrdemez Şahset, Özyay Gizem, Ekmekyapar Torun Fatma, Kul Sinan, Bingül Züleyha

Ecological Chemistry and Engineering. S

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2022

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Vol. 29, nr 2

199--216

EN

In this study, removal of colour from wastewaters prepared synthetically using Bomaplex Blue CR-L was investigated using raw and activated pumpkin seed shells by adsorption in a batch system. The effects of stirring speed, adsorbent concentration, dye concentration, temperature and pH on colour removal were investigated, and adsorption capacities of raw and activated pumpkin seed shells were determined. In addition, adsorption kinetics, isotherm coefficients, activation energies and thermodynamic parameters were calculated. The optimal adsorption conditions were determined as pH = 2, stirring speed of 200 rpm, adsorbent concentration of 10 g L–1 and 30 °C. Under the optimal conditions, the maximum removal efficiency of Bomaplex Blue CR-L using raw pumpkin seed shells was 73.01 %. This value rose to 79.71 % after activation processing was applied. Experimental adsorption data show that the adsorption is more suited to the Langmuir adsorption model and works in accordance with the pseudo-first-order kinetics model. As a result of thermodynamic research, ΔH° and ΔS° were 31.515 kJ mol–1 and 109.952 kJ mol–1 K–1 for the raw adsorbent, respectively. For the activated adsorbent, ΔH° and ΔS° were 43.118 kJ mol–1 and 152.237 kJ mol–1 K–1, respectively. The activation energy of adsorption was calculated as 10.918 kJ mol–1 for the raw adsorbent and 9.882 kJ mol–1 for the activated adsorbent.

3

Problem szkodliwości barwników azowych

Lisiak A., Miklas M.

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2007

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nr 3

38-40

PL

Barwniki azowe są to związki zawierające w swojej budowie jedną lub kilka grup azowych (NN), łączącą ze sobą aromatyczne związki pierścieniowe. W wyniku redukcji niektórych barwników azowych mogą powstawać niebezpieczne aminy aromatyczne, wykazujące właściwości alergenne, mutagenne lub kancerogenne. W poniższym artykule poruszono problem szkodliwości barwników azowych wykazujących zdolność do uwalniania, w wyniku redukcji, niebezpiecznych aryloamin.

EN

Most textiles, before using, are dyed or printed. Azo-dyes containing the azo group of two nitrogen atoms (NN) connecting aromatic ring compounds. Some of them, trough chemical breakdown, may form chemical substances called aromatic amines, that have been proven to be or are suspected of being alergogenic, mutagenic or carcinogenic. In this article problem of harmfulness of azo-dyes that have the capacity to release, by reductive cleavage, hazardous aryloamines is presented.

4

Prawda i mity o barwieniu poliamidu barwnikami OSTACET P w kontekście nowej procedury REACH

Przybył M.

Przegląd Włókienniczy - Włókno, Odzież, Skóra

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2007

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nr 8

23-24

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Photosensitized decomposition of textile dyes on TiO2-Tytanpol A11 and TiO2-Degussa P25

Zielińska B., Morawski A. W., Kaleńczuk R. J.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 3

150-152

EN

The photoassisted decomposition of five organic dyes (Reactive Red 198 (RR198), Reactive Black 5 (RB5), Acid Black 1 (AB1), Direct Green 99 (DG99) and Acid Blue 7 (AB7)) has been investigated in aqueous solution in the presence of two kinds of TiO2 photocatalysts: TiO2-Tytanpol A11 (,,Police" Chemical Factory, Poland) and TiO2-Degussa P25 (,,Degussa" Germany) and under the illumination by the Vis light. The results suggest that the value of the adsorption of the dyes on the photocatalyst surface is the controlling step of the photosensitized degradation of dyes. The A11 photocatalyst demonstrates higher activity than P25. This effect is diffrent from the one obtained under the UV illumination, where P25 shows a much higher activity. Additionally, it was investigated that for both phototocatalysts used the degree of dyes decomposition decreased with the increasing of the maximum absorption of the dyes.

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Barwniki dla włókiennictwa : wczoraj, dziś i jutro

Czajkowski W.

Prace Instytutu Włókiennictwa

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2005

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R. 55

7-14

PL

Od początku swojej historii ludzkość stosowała środki barwiące. Do odkrycia w roku 1856 moweiny przez W. H. Perkina były to produkty pochodzenia naturalnego. Przełom XIX i XX wieku zaowocował wieloma osiągnięciami w dziedzinie barwników syntetycznych uhonorowanymi nagrodą Nobla dla A. Baeyera w roku 1905. Postęp w tej dziedzinie uwarunkowany był rozwojem i potrzebami przemysłu włókienniczego. Obecnie dominujące znaczenie posiadają asortymenty stosowane do barwienia najwyżej tonażowych surowców włókienniczych - włókien celulozowych (barwniki reaktywne) i włókien poliestrowych (barwniki zawiesinowe). Obserwowane są przy tym ciągłe zmiany w obrębie wytwarzanych produktów spowodowane stałą poprawą ich właściwości użytkowych, oraz w coraz większym stopniu zmianami technologii barwienia spowodowanymi wymogami ochrony środowiska naturalnego. W najbliższej przyszłości można oczekiwać dalszych zmian w tym kierunku, aczkolwiek postulowany niekiedy powrót do "bezpiecznych ekologicznie" barwników naturalnych wydaje się mało prawdopodobny na większą skalę.

EN

From the beginning of our history mankind used colouring matters. Before discovering mauveine by W. H. Perkin in 1856 all these products were of natural origin. The end of 19th and beginning of 20th century have brought many achievements in the field of synthetic dyes honoured between others by Nobel Prize in 1905 for A. Baeyer. Further progress in this area was influenced by the development of the textile industry and various requests coming from this industry. At present time the most important classes of synthetic dyes are reactive dyes for cellulose fibres and disperse dyes for colouring polyester fibres. Continuous progress observed inside these products are due to increasing demands connected with their better fastness properties, as well as by modifications of dyeing procedures forced by current environmental requirements. Further changes in this field might be expected in the future although suggested sometimes return to "ecologically safe" natural dyes on greater scale seems to be less probable.