Abstract
Catalysts supported on nanomaterials have been widely investigated for the treatment of hazardous materials. This work has developed a novel method for grafting hematin on nanomaterials for catalyzing the oxidation of aniline in order to remove aniline from wastewater. Magnetic multi-walled carbon nanotubes (M-MWCNTs) were coated with a layer formed through the hydrolysis and condensation of 3-mercaptopropyltriethoxysilane (MPTS). Hematin was specifically grafted on the MPTS-coated M-MWCNTs through thiol-alkene reaction. Hematin-MPTS-M-MWCNTs were used to catalyze the oxidation of aniline, and a high efficiency has been obtained. Consecutive use of the conjugate of hematin-MPTS-M-MWCNTs has been investigated, and the activity has been retained to a significant extent after five reaction/cleaning cycles. The result demonstrates that hematin-MPTS-M-MWCNTs are efficient for catalyzing the oxidation of aniline. The methodology for the specific grafting of hematin is of general utility, it is an easy-to-operate method and can be extended to other supports. Potentially, hematin-MPTS-based conjugates have a widespread application in catalyzing the removal of aniline from wastewater.
Highlights
In coal-conversion processes, aniline is a by-product and is soluble in process water [1]
The procedures for the formation of magnetic nanoparticles, MPTS coating, and grafting hematin on Multi‐walled carbonnanotubes nanotubes (MWCNTs) are illustrated in Scheme 1
Magnetic nanoparticles were clearly observed on the MWCNT
Summary
In coal-conversion processes, aniline is a by-product and is soluble in process water [1]. Horseradish peroxidase has been intensively studied for the enzymatic catalysis of the oxidative polymerization of aniline [16,17,18]. Polymerization of aniline catalyzed by enzymes can be carried out under milder conditions, and the formed polyaniline can be removed from the wastewater through precipitation. Hematin has a low solubility in aqueous solutions and tends to aggregate at acidic conditions [16]. This is the obstacle for application of hematin [16]. Polymerization of aniline was catalyzed by the halloysite nanotubes-supported hematin [21]. Hematin grafted on MPTS-coated supports can have a widespread application in catalyzing the removal of aniline from wastewater
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