Preparation of Polyvinyl Alcohol/Carboxymethyl Cellulose Composite Loaded With Chromatin for the Efficient Adsorption of Dibenz[a,h]Anthracene From Aqueous Solutions

Abstract

In this study, to solve the problems of water solubility and difficulty in separation of chromatin after treatment with dibenz[a,h]anthracene (DBA) contaminants, we successfully prepared a chromatin-based composite for the efficient adsorption of DBA from pollutants. The fluorescence microscopy images and SEM images showed that the composite had dense and porous morphology characteristics, which not only effectively improved the aggregation of chromatin but also showed good adsorption impact. FTIR, TGA, and XRD analyses revealed that chromatin was evenly distributed throughout the composite and formed effective physical crosslinks. Its DBA adsorption efficiency could exceed 93.6%, and its DBA adsorption amount was 0.015 mg·g⁻¹. The results of the adsorption isotherm and adsorption kinetics demonstrated that the adsorption of DBA by the composite followed the pseudo-second-order kinetic model (0.9913 ≤ R² ≤ 0.9970) and Langmuir isotherm model (0.9930 ≤ R² ≤ 0.9982). The results of adsorption thermodynamics indicated that the adsorption process was spontaneous (ΔG < 0). This work provided a new idea and reference for removing DBA from pollutants.