ADSORPTION OF DIAZO DYE DIRECT RED-28 AND TETRA-AZO DYE DIRECT BLACK-22 USING CALCINED KAOLIN IN AQUEOUS SOLUTIONS

dc.contributor.authorFındık, Serap
dc.date.accessioned2023-04-03T07:17:43Z
dc.date.available2023-04-03T07:17:43Z
dc.date.issued2023en_US
dc.departmentHitit Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü
dc.description.abstractABSTRACT. In this study, the removal of diazo and tetra-azo dyes using calcined kaolin were compared. Direct red-28 (DR-28) and Direct black-22 (DB-22) was chosen as diazo and tetra-azo dyes, respectively. The kaolin obtained from Turkiye and calcined at 200 °C was found to be the most efficient adsorbent. Natural and calcined kaolins were characterized using SEM-EDS, FTIR, TGA, and XRD. The parameters such as, calcination temperature of the kaolin, adsorbent amount, temperature, initial pH, contact time, and initial concentration were studied. It was found that the removal rate of DR-28 was higher than that of DB-22 at the studied conditions. The removal of DR-28 and DB-22 were found to be 90.1% and 46.2% under the following conditions: adsorbent amount: 1.2 g/200 mL, initial concentration: 20 mg/L, original pH, temperature: 20 °C and contact time 120 min. The adsorption of the dyes was fitted to Langmuir isotherm model. The maximum adsorption capacity of calcined kaolin at 200 °C was determined as 5.39 and 3.5 mg/g for DR-28 and DB-22, respectively. The adsorption of DR-28 and DB-22 followed a pseudo-second order model. The thermodynamic study showed that the adsorption of DB-22 onto calcined kaolin was endothermic while that of DR-28 was exothermic.
dc.identifier.citationFindik, S. (2023). Adsorption of diazo dye direct red-28 and tetra-azo dye direct black-22 using calcined kaolin in aqueous solutions. Bulletin of the Chemical Society of Ethiopia, 37(3), 593-610.
dc.identifier.doi10.4314/bcse.v37i3.5
dc.identifier.endpage610en_US
dc.identifier.issn1011-3924
dc.identifier.issue3en_US
dc.identifier.startpage593en_US
dc.identifier.urihttps://dx.doi.org/10.4314/bcse.v37i3.5
dc.identifier.uri1726-801X
dc.identifier.urihttps://hdl.handle.net/11491/8462
dc.identifier.volume37en_US
dc.identifier.wosWOS:000944284100005
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.language.isoen
dc.publisherCHEM SOC ETHIOPIA
dc.relation.ispartofBULLETIN OF THE CHEMICAL SOCIETY OF ETHIOPIA
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectAdsorptionen_US
dc.subjectDiazo dyeen_US
dc.subjectTetra-azo dyeen_US
dc.subjectKaolinen_US
dc.titleADSORPTION OF DIAZO DYE DIRECT RED-28 AND TETRA-AZO DYE DIRECT BLACK-22 USING CALCINED KAOLIN IN AQUEOUS SOLUTIONS
dc.typeArticle

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