Synthesis of citric acid modified β‐cyclodextrin/activated carbon hybrid composite and their adsorption properties toward methylene blue

Abstract

In this article, citric acid modified β‐cyclodextrin/activated carbon hybrid (CA‐β‐CD/AC) composites were synthesized by crosslinking reaction, and their adsorption properties for methylene blue were studied. The scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and Brunauer–Emmett–Teller (BET) method were used to characterize the structure and the morphology of composite materials. It was investigated that the effect of experiment parameters on the adsorption performance including weight fraction of AC in the composite, the adsorbent dose, the initial concentration of MB, the solution pH value, contact time, and temperature. The maximum adsorption capacity calculated by the Langmuir isotherm is 862.07 mg g−1. Kinetic studies show that the adsorption process follows the pseudo‐first‐order and pseud‐second‐order reaction models. Thermodynamic analysis indicated that the adsorption behavior was an exothermic reaction. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48315.

High‐Efficiency Adsorption Performance of Cobalt Alginate/ Graphene Oxide Aerogel Prepared by Green Method for Methylene Blue

“…The experimental data were analyzed by fitting the pseudo‐first‐order model (Figure 5 (a)), pseudo‐second‐order model (Figure 5 (b)) and intra‐particle diffusion model (Figure 5 (c)), to study the adsorption of MB on CA/GO aerogel [32,33] . In the formula, t (min) and q t (mg/g) represent the contact time and the adsorption capacity at time t , respectively.…”

Adsorption of Cationic Pollutants from Water by Cotton Rope Coated with Cyclodextrin Polymers

“…Methylene blue (MB) is a hydrosoluble cationic dye with the chemical structure of thiazine that is used as a dye for the textile coloration, a medication for the treatment of methemoglobinemia, a stain for chromoendoscopy or different staining procedures, an antidote to potassium cyanide poisoning, a redox indicator in analytical chemistry, and a treatment for fungal infections in aquaculture [25]. The contamination of methylene blue in wastewater comes from textile, leather, cosmetics, photography, and other industries which could impact the environment and humans, because methylene blue is chemically stable, difficult to degrade, toxic, and carcinogenic according to its complex aromatic structures [26,27]. A concentration of methylene blue less than 1 mg/L has obviously been revealed as an aesthetic issue [28].…”

“…A concentration of methylene blue less than 1 mg/L has obviously been revealed as an aesthetic issue [28]. Various adsorbents have been prepared for MB removal such as hybrid composite of cyclodextrin/activated carbon [26], cyclodextrin/silver nanoparticles [29], hybrid adsorbent of cyclodextrin/silica [30], magnetic nanoparticles [31,32], cyclodextrin modified filter paper [33], cyclodextrin grafting wood flour [34], and insoluble cyclodextrin [35,36]. Crystal violet (CV) is a water-soluble cationic dye with the chemical structure of triarylmethane that is used as a dye, a histological stain, a topical antiseptic, and a dermatological agent [37].…”

“…Consequently, cyclodextrin-based adsorbents have been sparsely employed for environmental applications [50][51][52][53][54][55][56][57][58][59] because of the specific properties of cyclodextrin (CD) molecules which could entrap organic compounds with a suitable size into the cyclodextrin cavity to form an inclusion complex through host-guest interaction. Furthermore, citric acid (CTR) is an ecofriendly trifunctional cross-linking agent, which was reticulated with CD to obtain a three-dimensional cross-linked polymer for the enhancement of the adsorption performance of organic compounds [22,23,26,32,35,36]. Cellulose is a linear water-insoluble polysaccharide containing many glucose units, which is the most abundant renewable biopolymer on earth existing in the form of cotton, wood, and other fibers.…”

Hydroxyl porous aromatic frameworks for efficient adsorption of organic micropollutants in water

“…[3][4][5][6] Several methods have been designed to remove these microcontaminants, including photocatalytic degradation, 7-9 biodegradation, [10][11][12] oxidation, and physical adsorption. [13][14][15][16] In recent times, the adsorption method has been considered as a promising technology because of the ease of operation and low energy consumption. 17 Various solid adsorbents such as activated carbon 18,19 carbon nanotubes, 20 graphene oxide, 21 zeolites, 22 metal-organic frameworks (MOFs), 23 and covalent organic frameworks (COFs) [24][25][26] are widely used in the adsorption and degradation of organic micropollutants.…”