Facile preparation of carbon nanotubes based carboxymethyl chitosan nanocomposites through combination of mussel inspired chemistry and Michael addition reaction: Characterization and improved Cu2+ removal capability

Abstract

The adsorption removal of heavy metal ions from aqueous solution using polymer nanocomposites has attracted great interest because of their advantages from both nanomaterials and polymers. In this work, a facile and novel method has been developed for surface modification of multi-walled carbon nanotubes (CNT) with carboxymethyl chitosan via combination of mussel inspired chemistry and Michael addition reaction. To obtain resultant CNT based chitosan nanocomposites (CNT-PDA-CS), pristine CNT were first coated with polydopamine (PDA) thin films through self polymerization of dopamine under alkaline aqueous solution. Then PDA modified CNT were further functionalized with carboxymethyl chitosan (CS) via Michael addition reaction. The successful preparation of CNT-PDA-CS nanocomposites was ascertained by a series of characterization techniques including transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis and X-ray photoelectron spectrometry. The utilization of the resultant CNT-PDA-CS for removal of Cu 2+ from aqueous solution was also examined in this work. The results showed that CNT-PDA-CS exhibited obviously enhanced Cu 2+ removal capability as compared with the unmodified CNT. Considered the versatility of mussel inspired chemistry, the method described in this work should be a general route for fabricating highly efficient adsorbents, which should be of great interest for environmental applications.CNT-PDA-CS for Cu 2+ removal was examined. Because of the existence of functional groups such as carboxyl groups, amino groups and hydroxyl groups on the surface of CNT based nanocomposites, the CNT-PDA-CS exhibited obviously enhanced adsorption capability towards copper ions as compared with the unmodified CNT. Taken together, we have developed a novel, simple and universal strategy to prepare CNT based nano-adsorbents with high efficiency for removal of heavy metal ions from aqueous solution.These mussel inspired strategy should be a general method to fabricate various nanocomposites for environmental applications because of the universal and strong adhesion of PDA towards almost any materials and surface. [39,40] Scheme 1 the preparation of CNT-PDA-CS nanocomposites via a combination of mussel-inspired chemistry and a Michael addition reaction. Experiment Materials and characterizationDopamine hydrochloride was purchased from Sangon Biotech. Co., Ltd (Shanghai, China). CNT (> 95%, diameter of 30 to 50 nm) were purchased from Sino Nanotech Ltd. (Beijing, China). Tris (hydroxymethyl) aminomethane (Tris) and carboxylated chitosan are obtained from Aladdin Company (Shanghai China). All the other reagents are of analytical grade and used without further purification. Solution pH was monitored with a pH meter (Mettler-Toledo International Inc., China), fitted with a combined glass electrode (0.01 pH 2.4. Preparation of CNT-PDA-CS 200 mg of CNT-PDA was dispersed in Tris buffer solution (10 mM, pH = 8.5). 200 mg of chitosan was then added into the solution and stirred fo...

Synthesize of β‐cyclodextrin functionalized dendritic fibrous nanosilica and its application for the removal of organic dye (malachite green)

“…Especially, the mussel-inspired chemistry has been widely used for fabrication of functional composites for fabrication of adsorbents. [39][40][41][42][43][44][45][46][47][48][49] 4 | CONCLUSION In summary, KCC-1-NH-β-CD was found as a novel and efficient nano-adsorbent for the removal of MG from aqueous solution in the present study. The preparation of this adsorbent was involved synthesis of KCC-1 and its functionalization with β-Cyclodextrin.…”

Using polysaccharides for the enhancement of functionality of foods: A review

“…Chitosan is rich in amino, carboxyl and hydroxyl functional groups and can be used as a coordination site. Carboxymethyl chitosan was immobilized on CNT to form CNT-based chitosan nanocomposites by the combination of mussel adsorption chemistry and Michael addition reaction, which could overcome the shortcomings of traditional CNT (Zeng, et al, 2016).…”

Removal of acid dyes from aqueous solutions using a new eco‐friendly nanocomposite of CoFe2O4 modified with Tragacanth gum

“…Tragacanth gum (TG) and chitosan are the most abundant and inexpensive resource of biopolymers in the nature, and Iran is the largest producer of TG . Besides, TG as a porous hydrogel bead is eco‐friendly, nontoxic, low‐cost, and biocompatible with various functional groups like hydroxyl, carboxylic acid, and epoxy providing favorable conditions for H‐bonding and electrostatic interactions with various molecules containing functional groups.…”

“…Therefore, some modifications are necessary to improve the physical and chemical properties of native TG resulting changes in its solubility, stability, and sorption capacity of TG . These changes could be achieved by crosslinking, carboxymethylation, grafting, and mussel‐inspired methods to tailor the surface properties and to reduce the crystalline state of TG and produce accessible binding sites through expansion of the polymer network . On the other hand, researchers recently have investigated the immobilization of different polymeric materials onto the surface of magnetic compounds to address the issue of adsorbent recovery from wastewater because magnetic properties of adsorbent can introduce the efficient and facile strategy for separation of adsorbents from aqueous media .…”