Adsorption characteristics, isotherm, kinetics, and diffusion of modified natural bentonite for removing the 2,4,5-trichlorophenol

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• 作者：H. Zaghouane-Boudiaf ; ^{boudiafhassina2000@yahoo.fr" class="auth_mail} ; Mokhtar Boutahala ; Sousna Sahnoun ; Chafia Tiar ; Fatima Gomri
• 关键词：Bentonite ; Sulfuric acid ; Surfactant ; Adsorption ; 2 ; 4 ; 5-trichlorophenol
• 刊名：Applied Clay Science
• 出版年：March, 2014
• 年：2014
• 卷：90
• 期：Complete
• 页码：81-87
• 全文大小：684 K

文摘

Adsorption of the 2,4,5 trichlorophenol (TCP) from aqueous solution onto the surface of organo-bentonites was investigated spectrophotometrically. Natural bentonite was activated with sulfuric acid at 90 掳C and exchanged with a set of 4 alkyltrimethylammonium bromides (alkyl = C12, C14, C16 and C18) to evaluate the effect of carbon chain length on the TCP adsorption. X-ray diffraction was used to study the change in the structural properties of the samples. The basal spacing of the activated-bentonite (AB) increased from 13.4 to 21.5 脜 by intercalation of the cationic surfactants in the interlayer space of the clays. The intercalated cationic surfactants were characterized by Fourier transform infrared spectroscopy (FTIR). The surface areas of organo-bentonites were found to be much lower than that of AB. The contact time on the adsorption process was studied and the adsorption of TCP onto organo-bentonites followed pseudo-second-order kinetics. Adsorption isotherms were established and found to correlate with the Langmuir model with correlation coefficient of 0.998. Adsorption capacity of organo-bentonite increased with increasing the alkyl chain length. Results showed that TCP strongly interacted with AB exchanged with octadecyltrimethylammonium bromide (C18).