Adsorption of acid and basic dye from the simulated wastewater using carbonized microplastic particles synthesized from recycled polyethylene terephthalate plastic waste bottles: an integrated approach for experimental and practical applications

Abstract

This study emphasizes the possible utilization of carbonized microplastic particles (CMPs) prepared from polyethylene terephthalate (PET) plastic bottle waste for dye adsorption. Methylene blue (MB) and methyl orange (MO) are adsorbed in a batch experiment to determine the effects of various experimental factors, including contact time (1–210 min), solution pH (3–11), adsorbent dosage (1–20 g/L), temperature (25–600 °C), and initial dye concentration (5–70 mg/L). The variance analysis (ANOVA) results of response surface methodology (RSM) indicated that the second-order model was statistically significant and had a high coefficient value (R2 = 0.99 for MO and R2 = 0.92 for MB). The RSM results stated that solution pH and adsorbent dose significantly influence MO and MB dyes removal, where the maximum adsorption removal was 99.95 and 99.04% for MO and MB dye at high acidic (pH 3) and alkaline (pH 11) conditions, respectively, with high adsorbent doses. Furthermore, trained neural networks demonstrated a strong correlation between the experimental and projected colour removal efficiencies. The adsorption data for MO and MB were well explained by pseudo-second-order kinetics and Langmuir isotherm models. A thermodynamic study shows that dyes adsorptions are favourable, exothermic, and spontaneous. Finally, real wastewater and desorption studies indicate the effectiveness and environmentally friendly properties of CMPs.

Black carbon derived PET plastic bottle waste and rice straw for sorption of Acid Red 27 dye: Machine learning approaches, kinetics, isotherm and thermodynamic studies

“…This displays the probable uses of both adsorbents for eliminating AR 27 from industrial wastewater. Chakraborty et al [ 58 ] found similar results for adsorption acid and basic dye using carbonized PET plastic microplastic particles.…”

“…The thermodynamic study represents the role of temperature for adsorption, the nature of the linkage between adsorbate and adsorbent, direction and mechanism of reaction with changing the experimental temperature [ 58 ]. These study results are presented in Table 5 , and Fig 3B .…”

“…Adsorption thermodynamics studies. The thermodynamic study represents the role of temperature for adsorption, the nature of the linkage between adsorbate and adsorbent, direction and mechanism of reaction with changing the experimental temperature [58]. These study results are presented in Table 5, and Fig 3B . A Van't Hoff plot of lnkd vs 1/T made a 5 shows that negative values of ΔG 0 demonstrate that AR 27 adsorption processes are thermodynamically spontaneous and useful [35].…”

Removal of hazardous textile dye from simulated wastewater by municipal organic solid waste charcoal using machine learning approaches: Kinetics, isotherm, and thermodynamics

“…The positive ΔS 0 also suggest that lessening chance between the MOSWC and MO dye molecules interface, which mainly occurred through the chemical adsorption mechanism through the ion exchange process. Chakraborty et al [ 54 ] detect the exothermic reaction for dye adsorption using carbonizes adsorbent.…”