Wyniki wyszukiwania - BazTech

1

Removal of textile dyes from water using cellulose aerogel

Liugė Monika, Paliulis Dainius, Kumpienė Jūratė, Paulauskienė Tatjana

Ecological Chemistry and Engineering. S

|

2024

|

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

Application of sludge-based adsorbent for Acid Red 18 adsorption

Pieczykolan Barbara

Architecture Civil Engineering Environment

|

2024

|

Vol. 17, no. 1

105--114

EN

A study was conducted on the use of excess activated sludge from a municipal wastewater treatment plant as an adsorbent in the removal of Acid Red 18. The excess sludge was thermally modified using microwave radiation. The study aimed to evaluate the possibility of using this type of waste adsorbent in the batch adsorption process to remove a selected synthetic dye. Moreover, the experiments were aimed at analyzing the adsorption kinetics and adsorption isotherms of the batch adsorption process. Experimental results showed that in the case of adsorption kinetics, a greater match with experimental results was obtained for the pseudo-second-order model. This indicates that the adsorption process was chemical in nature. In the case of adsorption isotherm analysis, it showed that the best fit to experimental results was obtained for the Langmuir, Sips, and Toth isotherm models. Thus, this indicates the occurrence of a single-layer adsorption process. The determined values of adsorption capacity based on the Langmuir, Sips, and Toth models are in the range of 71.6 mg/g-79.0 mg/g.

3

Synthesis of hydrogel nanocomposites and their application in removing dyes and impurities

Ebrahimi Rajabali, Taherkhani Mahboubeh

Polimery

|

2023

|

Vol. 68, nr 5

276--285

EN

Polyacrylate hydrogels containing starch, ZnSe and Fe3O4 nanoparticles were obtained. The polymerization process was carried out in an ultrasonic field. The structure (SEM, FTIR, XRD), swelling properties and the ability of hydrogels to adsorb dyes (methylene blue, methyl orange, methyl red and Eriochrome Black T) and heavy metals (Cu2+) from wastewater were investigated. Hydrogels containing AgCl nanoparticles were also obtained, which, due to their antibacterial properties, can be potentially used in medicine.

PL

Otrzymano hydrożele poliakrylanowe zawierające nanocząstki skrobi, ZnSe i Fe3O4. Proces polimeryzacji prowadzono w polu ultradźwiękowym. Zbadano strukturę (SEM, FTIR, XRD), właściwości pęczniejące oraz zdolność hydrożeli do adsorpcji barwników (błękit metylenowy, oranż metylowy, czerwień metylowa i czerń eriochromowa T) oraz metali ciężkich (Cu2+) ze ścieków. Otrzymano również hydrożele zawierające nanocząstki AgCl, które ze względu na właściwości antybakteryjne mogą znaleźć potencjale zastosowanie w medycynie.

4

Biochars from wood biomass as effective methylene blue adsorbents

Charmas Barbara, Wawrzaszek Barbara, Jedynak Katarzyna

Physicochemical Problems of Mineral Processing

|

2023

|

Vol. 59, iss. 4

art. no. 176509

EN

Forest waste is a significant ecological and economic problem, requiring effective solutions that will not only reduce its quantity but also contribute to the protection of the natural environment. This research paper focuses on the use of sawdust from mixed trees, as one of the main forest wastes, for production of biochars characterized by adsorption properties. Sawdust, a by-product of the wood industry, has a porous structure, which makes it an attractive precursor to biochar. Using pyrolysis technology and hydrothermal activation under various conditions, sawdust was transformed into biochars with a developed specific surface area. The studies proved that the parameters of the pyrolysis process have a significant impact on the structural, surface and adsorption properties of biochars. The materials were characterized based on the results of N2 adsorption, scanning electron microscopy SEM/EDS, thermogravimetric analysis (TGA), Fourier Transform Infrared Spectroscopy (ATR-FTIR) and Raman spectroscopy. The surface characterization was made using the Boehm titration and pHpzc determination. The sorption capacity of methylene blue (MB) was studied. It was stated, that the obtained materials were characterized by a large specific surface area (227.5 - 1019 m2/g), the micro/mesoporous structure and the large pores volume (0.106 - 0.784 cm3/g). The surface oxygen functionalities allowed for large adsorption of MB. The adsorption process follows the Langmuir theory (qm,cal from 357.1 to 434.8 mg/g) and can be described using the kinetic pseudo-second-order model (R2 = 0.99). The obtained biochars showed high adsorption capacity of methylene blue impurities which indicates their significant potential for use in water purification.

5

Wpływ dodatku wybranych rodzajów wypełniaczy na właściwości sorpcyjne papieru

Pospiech Piotr, Łazorczyk Michał

Przegląd Papierniczy

|

2022

|

R. 78, nr 12

693--698

PL

W pracy zbadano efektywność adsorpcji barwnika (zieleni malachitowej) z roztworu wodnego na gotowych, wykonanych laboratoryjnie papierach, zawierających różnego rodzaju wypełniacze. W badaniach zastosowano typowe wypełniacze używane w papiernictwie oraz mikrocząstki siloksanowe niewykorzystywane do tej pory w technologii papieru. Określono również zależność stopnia adsorpcji, intensywności wybarwienia i przebiegu procesu wnikania wody w strukturę badanych papierów w zależności od ilości zastosowanych wypełniaczy.

EN

The study examined the effectiveness of dye adsorption (malachite green) from an aqueous solution on the laboratory made sheets containing various types of fillers. Typical fillers applied in papermaking and siloxane microparticles, previously unexploited in paper technology, were used in the research. The dependence of the efficacy of adsorption, the intensity of dyeing and the way of the process of water penetration into the structure of the tested papers, depending on the amount of fillers used, was also determined.

6

Electrokinetic properties of silica-titania mixed oxide particles dispersed in aqueous solution of C.I. Direct Yellow 142 dye – effects of surfactant and electrolyte presence

Chibowski Stanisław, Wiśniewska Małgorzata, Wawrzkiewicz Monika, Hubicki Zbigniew, Goncharuk Olena

Physicochemical Problems of Mineral Processing

|

2020

|

Vol. 56, iss. 6

6--13

EN

The mixed SiO2-TiO2 oxide obtained by the pyrogenic method with the silica:titanium percentage ratio equal to 20:80 (ST80) was used in the experiments. The influence of azo dye C.I. Direct Yellow 142 (DY) adsorption at the mixed oxide-solution interface on the electrokinetic properties of solid particles was studied. To determine solid surface charge density and zeta potential of examined suspensions the potentiometric titration and Doppler laser electrophoresis techniques were applied. The changes in structure of electrical double layer formed on the mixed oxide surface in the dye presence were specified as a function of DY concentration, inorganic salt addition and surfactant introduction. The effects of surfactant type and its concentration were determined. Three surfactants of different ionic character (anionic SDS, cationic CTAB and nonionic Triton X-100) were used in measurements. The obtained electrokinetic characteristics of ST80 mixed oxide dispersed in aqueous solutions with various adsorbate compositions is essential for such suspensions stability.

7

Equilibrium, kinetics and thermodynamic study of the adsorptive removal of methylene blue from industrial wastewater by white cedar sawdust

Gardazi Syed Mubashar H., Shah Jehanzeb Ali, Ashfaq Tayyab, Sherazi Tauqir A., Ali Muhammad Arif, Pervez Arshid, Rashid Naim, Iqbal Javed, Amin Bilal Ahmad Zafar, Bilal Muhammad

Environment Protection Engineering

|

2019

|

Vol. 45, nr 3

5--22

EN

The study evaluated the adsorption potential of white cedar sawdust (WCS) for dye removal. WCS was chosen from five preferred, abundant waste biomasses from Pakistan. Various parameters such as contact time, adsorbent dose, dye concentration, pH, and particle size were optimized for methylene blue (MB) dye adsorption. The adsorbent was characterized by FTIR, SEM, EDX and BET analyses. The surface area of the adsorbent was 1.43 m2·g-1 and pore volume was 0.000687 cm3·g-1. The adsorption data best fitted the isotherm models of Langmuir, Temkin, Dubinin–Radushkevich, and Freundlich. The maximum experimental adsorption capacity obtained was 55.15 mg·g-1, which was in close agreement to the calculated adsorption capacity. Fitness of the pseudo-second order kinetics suggested chemisorption as the rate-limiting step. Thermodynamic study for adsorption was carried out to evaluate the Gibbs free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°). The negative values ΔG° at the examined temperature range confirmed the spontaneous adsorption of MB onto WCS.

8

Post-coagulation sludge as an adsorbent of dyes from aqueous solutions

Pieczykolan Barbara, Płonka Izabela

Ecological Chemistry and Engineering. S

|

2019

|

Vol. 26, nr 3

509--520

EN

The main source of usable water supply in Poland is surface water. The most frequently used methods of surface water treatment are coagulation and filtration processes. During these processes post-coagulation sludge is generated, which is the main waste produced in water treatment plants. This sludge is characterized by an amorphous structure with a strongly developed specific surface, similar to sewage sludge. Dried and crushed post-coagulation sludge was used in the studies as an adsorbent of two acid dyes: Acid Red 18 (AR 18) and Acid Green 16 (AG 16). The most favourable pH of process and contact time as well as sorption isotherm were established. For both dyes the most favourable pH value was equal 2. The tests showed that in the case of AR 18 (180 min) a longer contact time was necessary to reach the equilibrium than for AG 16 (120 min). Moreover, based on the different isotherm two-parameter models, the sorption capacity, type of sorption and energy of sorption were calculated based on linear and non-linear regression. The tests showed that in the case of dye AG 16 monolayer sorption occurred - the analysis showed better fitting the results to Langmuir model. Moreover, for both dyes, physical adsorption took place - it was indicated by the values of parameter 1/n (computed from the Freundlich model).

9

Removal of methylene blue by natural and Ca and K-exchanged zeolite treated with hydrogen peroxide

Canli M., Abali Y., Bayca S. U.

Physicochemical Problems of Mineral Processing

|

2013

|

Vol. 49, iss. 2

481--496

EN

A comparison was made of influence of physically adsorbed methylene blue (MB) dye on the physicochemical properties of Manisa-Akdere zeolite (natural zeolite) and zeolite modified with K and Ca (all samples treated with hydrogen peroxide before modification) using batch adsorption technique. After elementary characterization of this adsorbent, the effects were investigated of initial MB concentration, pH, contact time, stirring rate, adsorbent dosage and temperature on the selectivity and sensitivity of the removal process. A larger adsorption of the dye was observed for modified zeolite (42.7 mg/g) than for natural zeolite (28.6 mg/g) per gram of an adsorbent after all zeolite samples treated with hydrogen peroxide. Zeolite treated with H2O2 showed higher adsorption capacity than untreated zeolite samples. The Langmuir model (R2 values between 0.959 and 0.996) fitted the experimental data better than the Freundlich model (R2 values between 0.804 and 0.988). The adsorption process was found to be slightly influenced by adsorbent dosage, contact time and temperature. Optimum pH for adsorption of MB was found to be at 7. Adsorption equilibrium attained within 30 minutes. The sorption of MB increased slightly with rising temperature. In addition, adsorption values rose with modification Ca-Exchanged (after H2O2 treatment) > K-Exchanged (after H2O2 treatment) > Zeolite treated with H2O2 > Ca-Exchanged >K-Exchanged >Natural Zeolite.

10

Adsorpcja zieleni naftolowej B na węglu aktywnym F-300

Bezak-Mazur E., Adamczyk D.

Proceedings of ECOpole

|

2012

|

Vol. 6, No. 2

683--688

PL

W pracy podjęto próbę oceny możliwości użycia węgla aktywnego F-300 do usuwania barwników ze ścieków farbiarskich. Do badań wybrano barwnik - zieleń naftolową B, a jako sorbent zastosowano węgiel aktywny F-300 świeży i regenerowany. Regeneracja została przeprowadzona za pomocą odczynnika Fentona, który jest doskonałym utleniaczem. Zdolności sorpcyjne węgla po regeneracji oceniano poprzez zmiany wartości liczby jodowej, która została wyznaczona zgodnie z normą PN-83 C-97555.04. Stężenie barwnika wynosiło 400 mg/dm3. Zdolności sorpcyjne węgla świeżego wyrażone wartością adsorpcji właściwej wyniosły 21 mg/g, a po regeneracji - od 22 do 33 mg/g. Na podstawie danych eksperymentalnych wykreślono izotermy sorpcji. Najwyższy stopień usunięcia zieleni naftolowej B z roztworu wodnego wyniósł 88% (po IV regeneracji), a najniższy - 74% (węgiel świeży). Dopasowano teoretyczny model adsorpcji, mianowicie model Freundlicha lub Langmuira. Wartość współczynnika korelacji wskazuje na lepsze dopasowanie modelu Langmuira. Otrzymane wyniki wskazują, iż wybrany sorbent zarówno w postaci świeżej, jak i zregenerowanej może być stosowany w procesach usuwania barwników ze ścieków farbiarskich. Jednak badania modelowe muszą zostać sprawdzone na realnych próbkach ścieków.

EN

In the present study, the sorptive capacity of activated carbon F-300 in the removal of dyes from textile wastewaters, was estimated. Dye - naphtol green B - were chosen to study, and as adsorbent we have chosen the activated carbon F-300, virgin and regenerated. Fenton reagent, which is good oxidant, was used for activated carbon regeneration. The iodine number, which was measured according to the directive PN-83 C-97555.04, was used to evaluate sorptive capacity of regenerated activated carbon. Dye concentration was 400 mg/dm3. Sorption abilities of activated carbon were expressed by mass balance relationship in case of fresh activated carbon it was 21 mg/g, and after regeneration - from 22 mg/g to 33 mg/g. The highest removal efficiency was 88% (carbon after 4th regeneration), the lowest - 74% for virgin carbon. The experimental data adsorption isotherms were defined. Adsorption theoretical model of Freundlich and Langmuir, was selected. The value of the correlation coefficient r2 showed better fit to Langmuir model. The experimental data show that chosen activated carbon can be used for the decontamination of dyes from textile wastewater. However, model tests need to be verified on real wastewater samples.

11

Adsorption Naphtol Green B on Activated Carbon F-300

Bezak-Mazur E., Adamczyk D.

Ecological Chemistry and Engineering. A

|

2012

|

Vol. 19, nr 9

1123-1131

EN

In the present study, the sorptive capacity of activated carbon F-300 in the removal of dyes from textile wastewaters, was estimated. Dye – naphtol green B – were chosen to study, and as adsorbent we have chosen the activated carbon F-300, virgin and regenerated. Fenton reagent, which is good oxidant, was used for activated carbon regeneration. The iodine number, which was measured according to the directive PN-83 C-97555.04, was used to evaluate sorptive capacity of regenerated activated carbon. Dye concentration was 400 mg/dm3. Sorption abilities of activated carbon were expressed by mass balance relationship in case of fresh activated carbon it was 21 mg/g, and after regeneration – from 22 mg/g to 33 mg/g. The highest removal efficiency was 88 % (carbon after 4th regeneration), the lowest – 74 % for virgin carbon. The experimental data adsorption isotherms were defined. Adsorption theoretical models Freundlich or Langmuir were selected. The value of the correlation coefficient (r2) showed better fit to Langmuir model. The experimental data shows that chosen activated carbon can be used for the decontamination of dyes from textile wastewater. However, model tests need to be verified on real wastewater samples.

PL

W pracy podjęto próbę oceny możliwości użycia węgla aktywnego F-300 do usuwania barwników ze ścieków farbiarskich. Do badań wybrano barwnik - zieleń naftolową B, a jako sorbent zastosowano węgiel aktywny F-300 świeży i regenerowany. Regeneracja została przeprowadzona za pomocą odczynnika Fentona, który jest doskonałym utleniaczem. Zdolności sorpcyjne węgla po regeneracji oceniano poprzez zmiany wartości liczby jodowej, która została wyznaczona zgodnie z normą PN-83 C-97555.04. Stężenie barwnika wynosiło 400 mg/dm3. Zdolności sorpcyjne węgla świeżego wyrażone wartością adsorpcji właściwej, która wynosiła 21 mg/g, a po regeneracji - od 22 mg/g do 33 mg/g. Na postawie danych eksperymentalnych wykreślono izotermy sorpcji. Najwyższy stopień usunięcia zieleni naftolowej B z roztworu wodnego wyniósł 88 % (po IV regeneracji), a najniższy - 74 % (węgiel świeży). Dopasowano teoretyczny model adsorpcji, tj. model Freundlicha lub Langmuira. Wartość współczynnika korelacji wskazuje na lepsze dopasowanie modelu Langmuira. Otrzymane wyniki wskazują, iż wybrany sorbent zarówno w postaci świeżej, jak i zregenerowanej może być stosowany w procesach usuwania barwników ze ścieków farbiarskich. Jednak badania modelowe muszą zostać sprawdzone na realnych próbkach ścieków.

12

Adsorpcja mieszaniny dwóch barwników na węglu aktywnym

Bezak-Mazur E., Adamczyk D.

Proceedings of ECOpole

|

2010

|

Vol. 4, No. 2

307--311

PL

Węgiel aktywny jest znany jako adsorbent różnych zanieczyszczeń znajdujących się w ściekach i powietrzu. W pracy podjęto próbę oceny zdolności sorpcyjnych węgla aktywnego w odniesieniu do barwników będących zanieczyszczeniami ścieków farbiarskich. Do badań wybrano mieszaninę dwóch barwników, błękitu metylowego i zieleni naftolowej B, a jako sorbent węgiel aktywny WDex świeży i regenerowany. Stężenie obu barwników wynosiło 200 mg/g. Zdolności sorpcyjne węgla świeżego wyrażone za pomocą adsorpcji właściwej wyniosły 60 mg/g, a po regeneracji - od 8 do 13 mg/g. Z danych eksperymentalnych wykreślono izotermy sorpcji oraz dopasowano teoretyczny model adsorpcji, mianowicie model Freundlicha lub Langmuira. Najwyższy procent usunięcia dla błękitu metylowego wyniósł 94% dla węgla świeżego, a najniższy - 75% (węgiel po IV regeneracji). Najwyższy procent usunięcia dla zieleni naftolowej B wyniósł 78% dla węgla po IV regeneracji, a najniższy - 55% (węgiel po I regeneracji). Uzyskane wyniki wskazują, iż zastosowany sorbent zarówno w postaci świeżej, jak i zregenerowanej może być stosowany w procesach usuwania barwników ze ścieków farbiarskich. Jednak badania modelowe muszą zostać sprawdzone na realnych (fabrycznych) próbkach ścieków.

EN

Activated carbon is known as adsorbent to various contaminants from wastewater and air. The aim of work was to estimate sorptive capacity of activated carbon in the removal of dyes, which are contaminants from textile wastewaters. The mixture of two dyes, methyl blue and naphtol green B were chosen to study, and as adsorbent we have chosen the activated carbon WDex, virgin and regenerated. Dye concentration in both cases was 200 mg/dm3. Sorption abilities of activated carbon were expressed by mass balance relationship in case of fresh activated carbon it was 60 mg/g, and after regeneration - from 8 to 13 mg/g. The experimental data adsorption isotherms were defined and adsorption theoretical model such as Freundlich or Langmuir, was selected. The highest removal efficiency in case of methyl blue was 94% for virgin carbon, the lowest - 75% (carbon after 4th regeneration). The highest removal efficiency in case of naphtol green B was 78% for carbon after IV regeneration, the lowest - 55% (carbon after 1st regeneration). The experimental data shows that activated carbon can be used for the decontamination of dyes from textile wastewater. However, model tests need to be verified on real wastewater samples.

13

Właściwości pigmentów kompozytowych SiO2/barwnik i ich zastosowanie w kauczuku silikonowym

Kosmalska A., Zaborski M., Sokołowska J.

Polimery

|

2010

|

T. 55, nr 3

215-221

PL

W procesie modyfikacji krzemionki na drodze mechanicznego wcierania (szminkowania) barwników w jej powierzchnię, w warunkach intensywnego mieszania otrzymaliśmy trwałe pigmenty kompozytowe. Jako związki barwiące zastosowaliśmy pochodne antrachinonu, azobenzenu i perylenu oraz indygotiazynę. Szminkowanie krzemionki zmniejsza jej powierzchnię właściwą, tendencję do agregacji cząstek i tworzenia struktury, pogarsza też aktywność napełniacza wobec kauczuku silikonowego zmieniając oddziaływania międzyfazowe, co jest konsekwencją nierównomiernej dyspersji pigmentu kompozytowego w elastomerze. Wulkanizaty napełnione zmodyfikowaną krzemionką wykazywały zwiększoną odporność na zmiany barwy w wyniku starzenia atmosferycznego, jednak ich wytrzymałość mechaniczna uległa pogorszeniu w stosunku do wytrzymałości kauczuku z udziałem krzemionki niemodyfikowanej.

EN

The modification of silica performed by mechanical frictioning of dyes into its surface occurring during intensive mixing has led to stable composite pigments (Table 1). Azo dye, antraquinone, perylene and indigothiazyne derivatives were used as dyeing agents. "Surface crayoning" of silica reduces its specific surface area, particle aggregation tendency, and the formation of structures. It also lowers the filling activity towards silicon rubber thereby altering the interphase interaction resulting in an uneven dispersion of the composite pigments in the elastomer (Table 2, 3, Fig. 2, 3). Vulcanizates filled with the modified silica exhibited an increased resistance to color changes caused by weathering, however, their mechanical resistance decreased in comparison with rubber filled with unmodified silica (Table 4, 5).

14

Pomiar powierzchni właściwej osadu czynnego w oczyszczalni ścieków

Barbusiński K.

Forum Eksploatatora

|

2010

|

Nr 4 (49)

40-43

PL

Efektywność procesu osadu czynnego zależy między innymi od właściwości i charakterystyki kłaczków osadu. Jedną z bardzo ważnych właściwości osadu czynnego jest jego powierzchnia właściwa, która ma wpływ na transport substratów do wnętrza kłaczków, a także zdolność do ich aglomeracji. W artykule opisano szczegółowo prostą metodę oznaczania powierzchni właściwej osadu czynnego przy użyciu barwnika Lissamine Scarlet 4R. Barwnik ten jest odpowiedni z następujących powodów: jest trwały, jego rozpuszczalność w wodzie nie jest zbyt duża (współzawodnictwo z rozpuszczalnikiem) i nie za mała (tworzenie miceli), może być łatwo oczyszczany, a także nie barwi szkła (brak osiadania cząstek barwnika na szkle).

EN

The effectiveness of the activated sludge process is related among others to the properties and characteristic of the sludge flocs. One of the very important properties of the activated sludge is specific surface area, which influence both the substrate transfer into floc and the effectiveness of flocs aggregation. In this paper, the simply method of measurement of activated sludge specific surface using dye Lissamine Scarlet 4R was detailed described. Lissamine Scarlet 4R is suitable for this purpose for the following reasons: it is stable, its solubility in water is neither too high (competition with solvent) nor too Iow (micelle formation), it can be efficiently purified and staining of glass tubes is negligible.

15

Modified silicas - adsorbents for decontamination of waste solutions from production of organic dyes

Andrzejewska A., Krysztafkiewicz A., Jesionowski T.

Polish Journal of Chemical Technology

|

2004

|

Vol. 6, nr 2

1-3

EN

Studies were performed on cleaning the solutions contaminated with organic dyes. Silica modified with the aminosilane coupling agent was used for the adsorption of the dyes. The procedure was followed by the estimation of the extent to which the dye was removed from the contaminated solution. In the obtained pigments, the particle size distribution, the tendency to form agglomerates as well as the particle surface morphology, were examined using the SEM and DLS techniques.