Abstract
With the continuous civilization and industrialization, the problem of dye wastewater treatment has been drawn widespread attention. This study focuses on in-situ reduction of cationic polyethylenimine (PEI) caged platinum nanomaterials (PEI-Pt) onto the bacterial cellulose (BC) substrate to fabricate a versatile bio-adsorbent (PEI-Pt@BC membrane). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA) were employed to confirm that PEI-Pt composite could anchor onto BC without any damage of its original three-dimensional porous structure. Thereafter, the distinguishing adsorption behaviors of PEI-Pt@BC membrane were studied choosing acid black ATT as a target and methylene blue (MB) as a control group. The maximum amount of acid black ATT adsorption reaches to 1157.9 mg/g, which conforms to the quasi-second-order kinetic model and Freundlich isothermal model. Whereas, the adsorption capacity of MB is only 13.5 mg/g. Obviously, the PEI-Pt@BC membrane has a preferential adsorbability of anionic dye than cationic analogue mainly attributed to the interaction between positive-charged PEI and dye molecules. Thus, this PEI-Pt@BC adsorbent exhibits eco-friendly and highly-efficient merits, showing a promising potential in treatment of anionic dyes especially from the textile printing and dyeing effluent.
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