Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

Treatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Com...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Meghdad Sheikhi, Hassan Rezaei
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption cr (vi) isotherm nano-chitin nanotechnology Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/b1b78027797941e58ad6a6c0343cf883
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:b1b78027797941e58ad6a6c0343cf883
record_format	dspace
spelling	oai:doaj.org-article:b1b78027797941e58ad6a6c0343cf8832021-11-05T21:08:57ZAdsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies1751-231X10.2166/wpt.2021.007https://doaj.org/article/b1b78027797941e58ad6a6c0343cf8832021-04-01T00:00:00Zhttp://wpt.iwaponline.com/content/16/2/436https://doaj.org/toc/1751-231XTreatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of chromium (VI) ions from aqueous solution in a batch system. The effects of pH, temperature, contact time, concentration, and adsorbent dose were investigated. According to the results, the optimum conditions of adsorption occurred at pH = 6, temperature = 25 °C, 60 minutes contact time, and 0.6 g·L−1 adsorbent dose. Investigation of equilibrium isotherms showed that the isotherm fitted the Freundlich model with a correlation coefficient of R2 = 0.9689. The pseudo second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy were calculated, which indicated spontaneous, endothermic, and random processes, respectively. Given the good results of this project, nano-chitin can be suggested as a novel adsorbent which is highly capable of adsorbing hexavalent chromium from aqueous solutions. Highlights Nano-chitin was purchased from the Nano-Novin Polymer Company.; Nano-chitin as a novel adsorbent is highly capable of adsorbing chromium from aqueous solutions.; The results showed that pH = 6, adsorbent dose of 0.1 g/L, 25 °C and 60-minute contact time were the optimum adsorption values in this research.; The results showed the data better fitted the Freundlich isotherm model and kinetic pseudo-second-order model.;Meghdad SheikhiHassan RezaeiIWA Publishingarticleadsorptioncr (vi)isothermnano-chitinnanotechnologyEnvironmental technology. Sanitary engineeringTD1-1066ENWater Practice and Technology, Vol 16, Iss 2, Pp 436-451 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption cr (vi) isotherm nano-chitin nanotechnology Environmental technology. Sanitary engineering TD1-1066
spellingShingle	adsorption cr (vi) isotherm nano-chitin nanotechnology Environmental technology. Sanitary engineering TD1-1066 Meghdad Sheikhi Hassan Rezaei Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
description	Treatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of chromium (VI) ions from aqueous solution in a batch system. The effects of pH, temperature, contact time, concentration, and adsorbent dose were investigated. According to the results, the optimum conditions of adsorption occurred at pH = 6, temperature = 25 °C, 60 minutes contact time, and 0.6 g·L−1 adsorbent dose. Investigation of equilibrium isotherms showed that the isotherm fitted the Freundlich model with a correlation coefficient of R2 = 0.9689. The pseudo second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy were calculated, which indicated spontaneous, endothermic, and random processes, respectively. Given the good results of this project, nano-chitin can be suggested as a novel adsorbent which is highly capable of adsorbing hexavalent chromium from aqueous solutions. Highlights Nano-chitin was purchased from the Nano-Novin Polymer Company.; Nano-chitin as a novel adsorbent is highly capable of adsorbing chromium from aqueous solutions.; The results showed that pH = 6, adsorbent dose of 0.1 g/L, 25 °C and 60-minute contact time were the optimum adsorption values in this research.; The results showed the data better fitted the Freundlich isotherm model and kinetic pseudo-second-order model.;
format	article
author	Meghdad Sheikhi Hassan Rezaei
author_facet	Meghdad Sheikhi Hassan Rezaei
author_sort	Meghdad Sheikhi
title	Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
title_short	Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
title_full	Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
title_fullStr	Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
title_full_unstemmed	Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
title_sort	adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/b1b78027797941e58ad6a6c0343cf883
work_keys_str_mv	AT meghdadsheikhi adsorptionofhexavalentchromiumionsfromaqueoussolutionsusingnanochitinkineticisothermsandthermodynamicstudies AT hassanrezaei adsorptionofhexavalentchromiumionsfromaqueoussolutionsusingnanochitinkineticisothermsandthermodynamicstudies
_version_	1718444059382513664

Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

Ejemplares similares