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Modified halloysite as an adsorbent for prometryn from aqueous solutions
Abstract Adsorption behavior of prometryn (2,4-bis (isopropylamino)-6-methylthio-s-triazine) on halloysite minerals has been studied in order to consider the application of such adsorbents in water purification. Halloysite, activated in various ways, was characterized by ASAP, SEM/EDS. Batch mode and flow system have been employed, using prometryn aqueous solutions. Various parameters were studied for both systems. Adsorption capacity was determined as a function of adsorbate concentration, of optimum contact time, optimum dose and adsorbent fragmentation. It was found that at pH=5 the best adsorptive properties for prometryn are obtained for halloysite treated with 96% H2SO4. Such adsorption matches Langmuir and Freundlich models and is in a good agreement with pseudo-second order kinetic model. The desorption of prometryn from halloysite was also studied. The performed studies show that halloysite treated with 96% H2SO4 holds the great potential for removal of water impurities such as prometryn.
Highlights Prometryn removal from water was performed using halloysite adsorbents. The best modification of halloysite was the treatment with 96% H2SO4. The adsorption occurred most effectively at pH 5. Prometryn desorbed from halloysite only to small degree.
Modified halloysite as an adsorbent for prometryn from aqueous solutions
Abstract Adsorption behavior of prometryn (2,4-bis (isopropylamino)-6-methylthio-s-triazine) on halloysite minerals has been studied in order to consider the application of such adsorbents in water purification. Halloysite, activated in various ways, was characterized by ASAP, SEM/EDS. Batch mode and flow system have been employed, using prometryn aqueous solutions. Various parameters were studied for both systems. Adsorption capacity was determined as a function of adsorbate concentration, of optimum contact time, optimum dose and adsorbent fragmentation. It was found that at pH=5 the best adsorptive properties for prometryn are obtained for halloysite treated with 96% H2SO4. Such adsorption matches Langmuir and Freundlich models and is in a good agreement with pseudo-second order kinetic model. The desorption of prometryn from halloysite was also studied. The performed studies show that halloysite treated with 96% H2SO4 holds the great potential for removal of water impurities such as prometryn.
Highlights Prometryn removal from water was performed using halloysite adsorbents. The best modification of halloysite was the treatment with 96% H2SO4. The adsorption occurred most effectively at pH 5. Prometryn desorbed from halloysite only to small degree.
Modified halloysite as an adsorbent for prometryn from aqueous solutions
Grabka, Danuta (Autor:in) / Raczyńska-Żak, Marta (Autor:in) / Czech, Kamil (Autor:in) / Słomkiewicz, Piotr Marek (Autor:in) / Jóźwiak, Małgorzata Anna (Autor:in)
Applied Clay Science ; 114 ; 321-329
06.06.2015
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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