Abstract
Synthetic dyes are widely used in textile, paper, plastic, and other industries, which are toxic and harmful to environment and human. Adsorption is an efficient method to control wastewater. Cellulose is an abundant, renewable, and eco-friendly polymer produced by plants and trees. An adsorbent for removal of dyes was successfully prepared by grafting amino-terminated hyperbranched polymer (NH2-HBP) and beta-cyclodextrin (β-CD) onto cotton fibers in this study. The adsorbent were characterized using Fourier-transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy analysis. The influences of adsorption parameters in a batch mode including initial solution pH, contact time, and dye initial concentration were evaluated in the experiments. The experiment results showed that the adsorption equilibrium was reached within 6 h for Congo red and within 4 h for methylene blue. Both the adsorption isotherms and kinetic studies showed that the behaviors of Congo red and methylene blue removal by the adsorbent based on cotton fibers conformed with Freundlich model and fitted pseudo-second-order model, respectively.
Highlights
Synthetic dyes are widely used in textile, paper, plastic, rubber, cosmetics, and food industries, which are stable and difficult to degrade in the nature
Cotton fibers were activated by NaOH aqueous solution, and activated cotton was chemically modified with β-CD and NH2-HBP, respectively
Fourier-transform infrared (FTIR) analysis, X-ray photoelectron spectroscopy (XPS) characterization, and scanning electron microscope (SEM) study of NC-cotton were conducted to describe the characteristics of NC-cotton
Summary
Synthetic dyes are widely used in textile, paper, plastic, rubber, cosmetics, and food industries, which are stable and difficult to degrade in the nature. Cotton fibers were activated by NaOH aqueous solution, and activated cotton was chemically modified with β-CD and NH2-HBP, respectively. In the static adsorption experiments, adsorbents at a dosage of 2.0 g/L were added to dye solutions (each for 100 mL) at desired concentrations.
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