Adsorpcja czerwieni kwasowej 114 i fuksyny zasadowej z roztworów wodnych na mezoporowatych materiałach węglowych

• Autorzy: Jedynak K. , Repelewicz M.

Identyfikatory

DOI

10.17512/ios.2016.2.6

Warianty tytułu

EN

Adsorption of Acid Red 114 and Basic Fuchsin from Aqueous Solutions on Mesoporous Carbon Materials

• Języki publikacji: PL

Abstrakty

PL

Celem pracy było zbadanie kinetyki adsorpcji oraz wyznaczanie izoterm adsorpcji czerwieni kwasowej 114 i fuksyny zasadowej z roztworów wodnych na zsyntezowanych metodą miękkiego odwzorowania mezoporowatych materiałach węglowych C-KS oraz C-KC. W trzech przypadkach kinetyka adsorpcji przebiegała zgodnie z modelem pseudo II - rzędu: C-KC (czerwień kwasowa 114) oraz C-KS (czerwień kwasowa 114 i fuksyna zasadowa), w jednym zgodnie z modelem pseudo I - rzędu: C-KC (fuksyna zasadowa). Równowaga adsorpcyjna ustaliła się we wszystkich badanych przypadkach po 8 h. Adsorpcja w warunkach równowagowych została opisana za pomocą równań Langmuira i Freundlicha. W trzech przypadkach adsorpcja barwników zachodziła zgodnie z modelem Langmuira, w jednym opisana została przez równanie Freundlicha - C-KC (czerwień kwasowa 114).

EN

In this work the adsorption of basic fuchsin and acidic red on mesoporous carbon materials C-KS and C-KC was examined. Carbon materials were obtained applying softtemplating method in environment of hydrochloric acid and citric acid. For examined adsorbents low-temperature nitrogen adsorption isotherms were determined, used next for porous structure parameters calculations. Obtained isotherms can be categorized as IV type according to IUPAC classification. Studied adsorbents have large surface area S_BET: 650 m²/g (C-KS) and 760 m²/g (C-KC); large total pore volume Vt: 0.59 cm³/g (C-KC) and 0.89 cm³/g (C-KS). Mesopores participation in total porosity of examined carbons is 83% for C-KS and 71% for C-KC. This confirms that examined carbons are mesoporous materials with significant advantage of mesoporosity over microporosity. Mesopores dimension, for maximum of distribution function (in the mesopores range) were estimated using Kruk- Jaroniec-Sayari (KJS) method. Mesopores dimension for C-KC carbon is 6 nm and for C-KS carbon is 8.7 nm. Adsorbates concentrations, before and after adsorption, were estimated using spectrophotometric method. Adsorption studies were carried out at 25°C. The adsorption equilibrium for studied mesoporous systems: carbon material - dye solution, was achieved after 8 hours. Studies of the adsorption process kinetics showed that in three cases adsorption kinetics proceeded in compliance with model of apparent II order of reaction: C-KC (acidic red 114) and C-KS (basic fuchsin and acidic red 114). In one case adsorption kinetics proceeded in compliance with model of apparent I order of reaction: C-KC (basic fuchsin). Obtained adsorption isotherms were applied to Langmuir and Freundlich equations. Adsorption process of fuchsin on both examined carbons and adsorption of acidic red on C-KC carbon was carried out in agreement with adsorption model described by Langmuir equation. However, acidic red adsorption on C-KC carbon is better described by Freundlich adsorption model. Adsorption abilities, of examined mesoporous carbon materials, are significantly higher in relation to fuchsin than to acidic red 114; e.g. for C-KS adsorbent, it is 1.289 mg/g (acidic red 114) and 10.661 mg/g (fuchsin). Applying K constant value from Langmuir equation, free enthalpy >G was calculated. Obtained values change in range of –25 to –34 kJ/mol. Negative values of >G show that studied adsorption process is spontaneous.

Słowa kluczowe

PL

czerwień kwasowa 114; fuksyna zasadowa; adsorpcja; mezoporowate materiały węglowe

EN

acid red 114; basic fuchsin; adsorption; mesoporous carbon materials

• Wydawca: Wydawnictwo Politechniki Częstochowskiej
• Czasopismo: Inżynieria i Ochrona Środowiska
• Rocznik: 2016
• Tom: T. 19, nr 2
• Strony: 227--239
• Opis fizyczny: Bibliogr. 45 poz.

Twórcy

autor

Jedynak K.

• Uniwersytet Jana Kochanowskiego, Instytut Chemii, ul. Świętokrzyska 15G, 25-406 Kielce

autor

Repelewicz M.

• Uniwersytet Jana Kochanowskiego, Instytut Chemii, ul. Świętokrzyska 15G, 25-406 Kielce

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.