Removal of methylene blue and congo red by magnetic chitosan nanocomposite: Characterization and adsorption studies

Abstract

Dyes are stable organic pollutants that have been used in many industries and become one of the toxic contaminants for the environment. This research aimed at preparing a magnetic chitosan nanocomposite (MCN) as an effective adsorbent for cationic and anionic dye removal from aqueous solution. The MCN was synthesized using a coprecipitation method. The physical properties of MCN were characterized using elemental analysis (CHNO), vibrating sample magnetometry (VSM), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and X-ray diffractometry (XRD). The results confirm that chitosan has been embedded on the surface of magnetic material and shows superparamagnetic properties behavior. A series of adsorption were conducted to investigate dosage of adsorbent, contact time and initial dye concentration to obtain the optimum condition of adsorption for both methylene blue (MB) and congo red (CR) dyes. The experimental equilibrium adsorption were then analyzed by the Langmuir and Freundlich isotherm models. Based on the correlation coefficient (R 2) values, the equilibrium adsorption data were fitted to the Langmuir isotherm model. The maximum adsorption capacity (q m) obtained from the Langmuir isotherm model for MB and CR onto MCN was 0.1308 and 1.8257 mg/g, respectively. Results highlight the potential of MCN application as an adsorbent for water contaminated by dyes.

Appraisal of Chitosan-Gum Arabic-Coated Bipolymeric Nanocarriers for Efficient Dye Removal and Eradication of the Plant Pathogen Botrytis cinerea

“…The removal impact of adsorbent dose on CR, CV, and PR (50 μg/mL) dye from water was studied at 0.5, 1.0, and Recent reports of the CScontaining nanocomposite showed dose-dependent increased adsorption of the CR dye 65% at 25 mg concentration of the adsorbent. 67,68 CS NPs prepared by IG with sodium tripolyphosphate exhibited 98.2% significant CR dye removal with encapsulation capacity 5107 mg CR/g CS NPs. 69 The salt addition method estimated the point of zero charge pH (pH pzc ) of the synthesized CS-GA-5ID-LP-NPs.…”

Highly Efficient Removal of Methylene Blue Dye from an Aqueous Solution Using Cellulose Acetate Nanofibrous Membranes Modified by Polydopamine

“…The equilibrium adsorption capacity of DA@PDA nanofiber membranes increased as the original MB solution concentration increased. This can be attributed to the fact that the higher original MB solution concentration provided a larger driving force to break through the mass transfer resistance of the MB . These results showed that the adsorption process largely relied on the original MB solution pH and concentration.…”

Preparation and application of magnetic chitosan in environmental remediation and other fields: A review

“…Conversely, the adsorption behavior of methylene blue (MB) and Congo red (CR) on the hybrid Fe 3 O 4 chitosan nano-composite (MCN) was studied by Jumadi et al 141 with several effects such as pH, salt concentration, contact time, and the concentration of the adsorbent examined. 141 The findings demonstrated that when the amount of adsorbent increased, the adsorption of MB and CR increased due to vacant adsorption sites. The adsorption was lower since no hydrogen/electrostatic bonding was generated between protonated MB and CR with negatively charged iron oxide.…”