Adsorption Performance of Modified Nkalagu Bentonite in Dye Removal: Kinetics, Equilibrium, Thermodynamics and Structural Properties of the Modified Samples

Autor:	Regina Obiageli Ajemba
Rok vydání:	2015
Předmět:	Adsorption Equilibrium thermodynamics Chemical engineering Chemistry Bentonite General Physics and Astronomy Removal kinetics General Materials Science Physical and Theoretical Chemistry Mathematical Physics
Zdroj:	Pakistan Journal of Scientific & Industrial Research Series A: Physical Sciences. 58:157-171
ISSN:	2223-2559 2221-6413
Popis:	The adsorption performance of modified Nkalagu bentonite in removing Congo red (CR) from solution was investigated. The raw bentonite was modified by three different physicochemical methods: thermal activation (TA), acid activation (AA), and combined acid and thermal activation (ATA). The Congo red adsorption increased with increase in contact time, initial dye concentration, adsorbent dosage, temperature, and pH change. The results of the kinetics analysis of the adsorption data revealed that adsorption follows pseudo second-order kinetics. Analysis of the equilibrium data showed that Langmuir isotherm provided a better fit to the data. Evaluation of the thermodynamic parameters revealed that adsorption process is spontaneous and endothermic. The results from this study suggest that a combination of thermal and acid activation is an effective modification method to improve adsorption capacity of bentonite and makes the bentonite as low-cost adsorbent for removal of water pollutants.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::50d3d0b4f982a8a479fe09d5100c0d55 https://doi.org/10.52763/pjsir.phys.sci.58.3.2015.157.171 Zobrazit plný text záznamu