Preparation of NiFe₂O₄/polythiophene nanocomposite and its enhanced adsorptive uptake of Janus green B and Fuchsin basic from aqueous solution: Isotherm and kinetics studies

Abstract

NiFe 2 O 4 /polythiophene nanocomposite was synthesized by in situ chemical oxidative polymerization of thiophene in NiFe 2 O 4 nanoparticles presence, whereas NiFe 2 O 4 nanoparticles were prepared via coprecipitation method. Fourier transform infrared (FTIR), X-ray diffraction (XRD), UV-Visible, and SEM, EDX techniques were used for characterization of the nanocomposite. The effect of various parameters such as adsorbent dose, contact time, initial dye concentration, and initial pH of solution on the adsorption of Janus green B (JG) and Fuchsin basic (FB) onto the nanocomposite was optimized by batch studies. The equilibrium uptake data ascribed well to the Langmuir model with maximum adsorption capacity of 143 and 498 mg/g at 303 K for JG and FB, respectively. The exceptional high adsorption capacity of NiFe 2 O 4 /polythiophene nanocomposite for JG and FB was ascribed to π-π and electrostatic interactions. Kinetics studies pointed out that JG and FB removal followed pseudo-second order model. The negative values of ΔH (JG: -47.28; FB: −38.00 kJ/ mol) and ΔG (JG: −9.347 to −6.442; FB: −14.16 to -12.85 kJ/mol) pointed out the feasibility, spontaneity, and exothermic nature of removal process. Negative value of ΔS (JG: -0.125; FB: -0.078 kJ/mol) suggested decrease in randomness at the solid/ liquid interface. The results showed that NiFe 2 O 4 /polythiophene is an appealing adsorbent for the uptake of JG and FB dyes from aquatic environment. K E Y W O R D S adsorption, Fuchsin basic, Janus green B, NiFe 2 O 4 /polythiophene nanocomposite, non-linear regression analyses, thermodynamics

Cu(ii) and Zn(ii) frameworks constructed by directional tuning of diverse substituted groups on a triazine skeleton and supermassive adsorption behavior for iodine and dyes

“…for JGB dye was 204.88 mg g −1 . The adsorption capacity of JGB in this work was higher than that for reported materials 56,57 (98.03 mg g −1 and 143 mg g −1 ).…”

Cellulose Nanocrystals Derived from Microcrystalline Cellulose for Selective Removal of Janus Green Azo Dye

“…Generally, azo dyes are harmful to human health 39 and, if it bioaccumulates in the human body, it can cause bladder, liver, and gut cancer. 40 Herein, the adsorption of ∼30 mg L −1 of the JG dye was done in ∼2 h by CNC, and it follows the pseudo-second-order kinetics and the Langmuir isotherm model. The effects of various parameters such as the loading of the adsorbent, initial dye concentration, temperature, and pH of the solution on the adsorption properties of CNC have been studied.…”

Evaluation of adsorptive and photocatalytic degradation properties ofFeWO4/polypyrrole nanocomposite for rose bengal and alizarin red S from liquid phase: Modeling of adsorption isotherms and kinetics data

“…During past few years, conducting polymer-metal oxides nanocomposites 16,17 have been extensively studied for the adsorptive uptake of dyes/metals from water, but to the best of our knowledge, there are fewer studies on the adsorptive removal and photocatalytic degradation of textile dyes by polypyrrole-based nanocomposites. 18 The incorporation of polypyrrole (PPy) with FeWO 4 NPs is expected to minimize the aggregation of FeWO 4 NPs, which may lead to significant improvement in the adsorption capacity of the NC, and augment its visible-light driven photocatalytic performance owing to enhanced separation of photo-excited charge carriers.…”