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Adsorption of chloroanilines from aqueous solutions on the modified halloysite
Abstract Batch removal of 3-, 4-chloroaniline and 3,4-dichloroaniline from an aqueous solution using unmodified and acid-activated halloysite was investigated in this study. The influence of acid concentration used for digesting the halloysite, contact time as well as the concentration of chloroaniline solutions was reported. The results show that the adsorption of 4-chloroaniline was greatly enhanced by using a sulfuric acid-treated halloysite, as compared to the unmodified halloysite. A comparison of kinetic models applied to the adsorption of chloroanilines on an acid-treated halloysite was evaluated for pseudo first-order, pseudo second-order, and intraparticle diffusion kinetic models. The chemisorption pseudo-second order kinetic model was found to correlate the experimental data well. The adsorption mechanism of acid-treated halloysite -chloroaniline system complied well with the Langmuir model in the case of 4-chloroaniline and 3,4-dichloroaniline and with the Freundlich model for 3-chloroaniline.
Highlights The removal of chloroanilines from an aqueous solution on halloysite. The Langmuir model described well the adsorption data for 4CA and 34DCA. Equilibrium data are well suited to a Freundlich isotherm in the case of 3CA. Modified halloysite is a promising adsorbent for the 4CA removal from water.
Adsorption of chloroanilines from aqueous solutions on the modified halloysite
Abstract Batch removal of 3-, 4-chloroaniline and 3,4-dichloroaniline from an aqueous solution using unmodified and acid-activated halloysite was investigated in this study. The influence of acid concentration used for digesting the halloysite, contact time as well as the concentration of chloroaniline solutions was reported. The results show that the adsorption of 4-chloroaniline was greatly enhanced by using a sulfuric acid-treated halloysite, as compared to the unmodified halloysite. A comparison of kinetic models applied to the adsorption of chloroanilines on an acid-treated halloysite was evaluated for pseudo first-order, pseudo second-order, and intraparticle diffusion kinetic models. The chemisorption pseudo-second order kinetic model was found to correlate the experimental data well. The adsorption mechanism of acid-treated halloysite -chloroaniline system complied well with the Langmuir model in the case of 4-chloroaniline and 3,4-dichloroaniline and with the Freundlich model for 3-chloroaniline.
Highlights The removal of chloroanilines from an aqueous solution on halloysite. The Langmuir model described well the adsorption data for 4CA and 34DCA. Equilibrium data are well suited to a Freundlich isotherm in the case of 3CA. Modified halloysite is a promising adsorbent for the 4CA removal from water.
Adsorption of chloroanilines from aqueous solutions on the modified halloysite
Szczepanik, Beata (author) / Słomkiewicz, Piotr (author) / Garnuszek, Magdalena (author) / Czech, Kamil (author)
Applied Clay Science ; 101 ; 260-264
2014-08-28
5 pages
Article (Journal)
Electronic Resource
English
Adsorption of chloroanilines from aqueous solutions on the modified halloysite
| Online Contents | 2014
Modified halloysite as an adsorbent for prometryn from aqueous solutions
| Elsevier | 2015