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Error Analysis of Adsorption Isotherm Models for acid dyes onto Bamboo Derived Activated Carbon

Chinese Journal of Chemical Engineering 2012年第3期20卷 535-542页

作者： L.S.Chan W.H.Cheung S.J.Allen G.McKay Department of Chemical and Biomolecular Engineering the Hong Kong University of Science and TechnologyHong KongChina School of Chemistry and Chemical Engineering Queen's UniversityBelfastBelfastNorthern IrelandUK

High surface area activated carbons were produced by thermal activation of waste bamboo scaffolding with phosphoric *** component equilibrium dye adsorption was conducted on the carbons produced and compared with a commercially available *** acid dyes with different molecular sizes,namely acid Yellow 117(AY117) and acid Blue 25(AB25),were used to evaluate the adsorption capacity of the produced *** was found that the dye with smaller molecular size,AB 25,was readily adsorbed onto the produced carbon,nearly three times higher than a commercially available carbon,while the larger size dye,AY117,showed little *** experimental data were analyzed using isotherm equations including Langmuir,Freundlich,Tempkin,Toth,Redlich-Peterson and Sips *** equilibrium data were then analyzed using five different non-linear error analysis methods.

关键词： adsorption activated carbon acid dye equilibrium isotherm error analysis bamboo

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CI acid Orange 52 dye Removal Using Natural and Formulated Clay-Lime Materials: Isotherm, Kinetic and Thermodynamic Studies

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Journal of Materials Science and Chemical Engineering 2023年第11期11卷 48-74页

作者： Fumba Gaston Essomba Jean Serge Ankoro Naphtali Odogu Kouotou Daouda Bélibi Bélibi Placide Désiré Ndi Julius Nsami Ketcha Mbadcam Joseph Laboratory of Applied Physical and Analytical Chemistry Department of Inorganic Chemistry Faculty of Science University of Yaoundé I Yaoundé Cameroon Inorganic and Physical Chemistry Lab CSIR-Central Leather Research Institute Chennai India Department of Chemistry Faculty of Science University of Buea Buea Cameroon

The main objective of the study is to improve the removal efficiency of Ourlago-kaolin (Kao), sodium montmorillonite (Na-MMT), and two formulated clay-lime (F13 and F23) towards CI acid Orange 52 dye (AO52). F13 and F23 were obtained by chemical stabilization through thermal treatment at 300°C. Fourier Transform Infrared spectra showed different surface functional groups on the clay materials, X-ray diffraction patterns revealed the raw materials contain many crystalline phases, scanning electron microscopy micrographs showed the variation of the layered structures of different clay materials, energy dispersive X-Ray analysis micrographs revealed compositional information and thermogravimetric-differential scanning calorimetry curves indicated the higher weight loss of 11.26% and 11.38% were observed for F13 and F23 respectively. BET surface area analyzed gave 133.0071 m2•g−1 for F13 and 132.34803 m2•g−1 for F23. The optimum pH value was 2.0 for Kao and Na-MMT. The adsorption experiments indicated that F13 and F23 have the maximum uptake abilities of 7.8740 and 3.1645 mg•g−1, respectively, compared to Kao (0.8761 mg•g−1) and Na-MMT (2.6178 mg•g−1). The pseudo-second-order model well described the adsorption kinetic model of AO52 dye onto the overall samples;Langmuir and Freundlich’s isotherms appropriately described the uptake mechanism. The positive values of ∆G° and negative value ∆H° indicated that the adsorption process was spontaneous and endothermic for Na-MMT, and non-spontaneous and exothermic for Kao, F13, and F23 because of their positive values of ∆G° and negative value of ∆H°. The modified clays have higher adsorption capacities and better life cycles compared hence opening new avenues for efficient wastewater treatment.

关键词： Ourlago-Kaolin Sodium Montmorillonite Formulated Clay Lime Adsorption acid dye Thermodynamic

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Synthesis of Novel acid dyes with Coumarin Moiety and Their Utilization for dyeing Wool and Silk Fabrics

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Open Journal of Medicinal Chemistry 2016年第1期6卷 18-35页

作者： Mahmoud S. Bashandy Fatma A. Mohamed Mohamed M. El-Molla Mahmoud B. Sheier Ahmed H. Bedair Chemistry Department Faculty of Science (Boys) Al-Azhar University Cairo Egypt Chemistry Department University College in Al-Jamoum Umm Al-Qura University Makkah Saudi Arabia Textile Research Division National Research Centre Giza Egypt Balguenvzh University College Department of Female Student Umm Al-Qura University Makkah Saudi Arabia Chemistry Department College of Sciences & Art Al Jouf University El-Quraiat Saudi Arabia

This article describes the synthesis of some novel coumarin compounds to use as acid dyes by using compounds 1 - 4 as starting materials, which were prepared by interaction of 2-hydroxybenzaldehyde with ethyl 3-oxobutanoate, diethylmalonate, 4-nitrobenzenediazonium chloride and 4-sulfobenzenediazonium chloride, respectively. Compound 1 reacted with bromine and 2-cyanoacetohydrazide to give phenacyl bromide derivative 5 and 2-cyanoacetohydrazone derivative 6, respectively. Coupling of compound 6 with equimolar amount of 2-sulfo-4-((4-sulfophenyl) diazenyl)benzenediazonium chloride gave coumarin acid dye 8. Phenacyl bromide derivative 5 re-acted with potassium cyanide in refluxing ethanol to produce compound 7, which on coupling with equimolar amount of 8-hydroxy-6-sulfonaphthalene-2-diazonium chloride and 8-hydroxy-3,6-disulfonaphthalene-1-diazonium chloride gave coumarin acid dyes 9 and 10, respectively. Interaction of compound 2 with 2-amino-5-((4-sulfophenyl)diazenyl)benzenesulfonic acid, benzene-1,4-diamine and 3,3’-dimethoxy-[1,1’-biphenyl]-4,4’-diamine in refluxing ethanol afforded compounds 11, 12 and 14, respectively. Diazonium sulphate of compounds 12 and 14 coupling with 4-amino-5-hydroxynaphthalene-2,7-disulfonic acid gave compounds 13 and 15, respectively. Cyclocondensation of compound 3 with ethyl 3-oxobutanoate, diethyl malonate and malononitrile afforded derivatives of 3-acetyl-2H-chromen-2-one 16, ethyl 2-oxo-2H-chromene-3-carboxylate 17 and 2-imino-2H-chromene-3-carbonitrile 18, respectively. Reaction of sodium benzenesulfonate derivative 4 with ethyl 3-oxobutanoate and hydrazine hydrate gave compounds 19 and 20, respectively. The structures of the newly synthesized compounds were confirmed by elemental analysis, UV/ VIS, IR, 1H NMR and Ms spectral data. The suitability of the prepared dyestuffs for dyeing of wool and silk fabrics has been investigated. The dyed fabric shows good light fastness, very good rubbing, perspiration, washing and excellent

关键词： Synthesis Coumarin acid dye dyeing Wool Fabric

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Study on Decoloration of acidic Scarlet GR by Pyrolusite Oxidation under an acid Condition

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Acta Geologica Sinica(English Edition) 2006年第2期80卷 257-261页

作者： CHEN Gang QING Chengsong CHEN Tianhu LI Xiaoxuan SONG Yinxian PENG Shuchuan School of Natural Resources and Environmental Engineering Hefei University of Technology Hefei Anhui 230009 School of Chemical Engineering Hefei University of Technology Hefei Anhui 230009

Decoloration of acidic scarlet GR by pyrolusite is studied in this paper. The effects of pH in solution, dosage and granularity of pyrolusite, reaction temperature, and vibration speed on decoloration efficiency are discussed. According to experiment results, the decoloration efficiency may exceed 95% for 40 mg/L GR solution by pyrolusite, pH is most important among all factors which impact the decoloration of acidic scarlet GR. Dosage and granularity of pyrolusite, reaction temperature, and vibration speed have a little benitfit on decoloration. The high decoloration efficiency and low removal efficiency of COD as well as FT-IR spectra of products between pyrolusite and acidic scarlet GR indicate that acidic scarlet GR undergoes the redox reaction on the interface of mineral and its chromophore is oxidated and decolored, but it is not removed thoroughly by oxidation.

关键词： pyrolusite acid dye chemical oxidation environmental mineralogy

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