Preparation of Aspergillus niger Mycelium-chitosan Biosorbent and Its Adsorption Characteristics for Cr (VI)
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Abstract:
The adsorption characteristics of Aspergillus niger mycelium-chitosan for Cr(VI) were studied. The waste Aspergillus niger mycelium and chitosan were used as raw materials for the preparation of Aspergillus niger mycelium-chitosan composite biosorbent for Cr(VI), through cross-linking with epichlorohydrin and then immobilizeation with sodium tripolyphosphate. The effects of pH and loading amount of Aspergillus niger mycelium-chitosan on the adsorption of Cr(VI). The experimental results showed that the adsorption rate of Cr(VI) was up to 92.30% when the loading amount of Aspergillus niger mycelium-chitosan was 0.5 g, and reached 84.32% when pH=6. Analysis of kinetic data revealed that the adsorption process of Aspergillus niger mycelium-chitosan biosorbent on Cr(VI) conformed to the quasi-secondary kinetic model (R2=1), and in the meantime, the Freundlich isotherm model (with the maximum adsorption capacity reaching 108.23 mg/g); Scanning electron microscopy (SEM) and infrared spectroscopy (IR) confirmed that the adsorption reaction occurred on the surface layer of the Aspergillus niger mycelium-chitosan adsorbent, involving mainly -OH and -COOH functional groups; The above results showed the good performance of Aspergillus niger mycelium-chitosan towards Cr(VI), which is environmentally friendly and has broad application prospects.
