Investigations on the batch performance of cationic dyes adsorption by citric acid modified peanut husk

Autor:	Hongjuan Bai, Xue Zhao, Shuaipeng Gao, Runping Han, Weihua Zou
Rok vydání:	2012
Předmět:	Aqueous solution Diffusion Langmuir adsorption model Ocean Engineering Pollution Husk chemistry.chemical_compound symbols.namesake Adsorption chemistry symbols Organic chemistry Freundlich equation Citric acid Methylene blue Water Science and Technology Nuclear chemistry
Zdroj:	Desalination and Water Treatment. 49:41-56
ISSN:	1944-3986 1944-3994
DOI:	10.1080/19443994.2012.708197
Popis:	A citric acid modified peanut husk (MPH) was used as adsorbent for removal of neutral red (NR) and methylene blue (MB) from aqueous solution. A batch system was applied to study the behavior of NR and MB adsorption in single and binary systems on MPH. Such studies were conducted by varying various parameters such as the initial dye concentration, the pH, the salt concentration, the temperature, and the contact time. Adsorption kinetic data were fitted using pseudo-first-order equation, pseudo-second-order equation, and intraparticle diffusion model. The process mechanism was found to be complex, consisting of both surface adsorption and pore diffusion. The effective diffusion parameter D i values estimated in the order of 10−8 cm2/s indicated that the intraparticle diffusion was not the rate-controlling step. The NR adsorption isotherm follows the Langmuir model, while MB adsorption follows the Freundlich isotherm. The thermodynamics parameters of adsorption systems indicated spontaneous and endo...
Databáze:	OpenAIRE
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