Dye Congo Red adsorptive decolorization by adsorbents obtained from Trametes pubescens pellets

A design of various dyes decolorization was conducted with the adsorbents obtained from Trametes pubescens pellets in submerged cultures. The results demonstrated that the adsorbents prepared by moist heat sterilization exhibited preferable decolorization capacity on azo dye Congo Red. A maximum decolorization rate of Congo Red of 72.31% was observed, which was all around 2.25 times higher than that of anthraquinone dye Disperse Blue B at the same level. Moreover, the decolorization rate-dependent influencing factors, i.e. salinity, Tween80, temperature, pH, and dye concentration, were optimized by Box-Behnken full factorial design. When they were 1.06% (m/V), 3.50% (V/V), 41.0 degrees C, 6.15, and 114.34mg/L respectively, the decolorization rate was up to 100% after a 7-day incubation period. Adsorptive decolorization was caused by the electrostatic forces between dye molecules and adsorbents obtained from T. pubescens pellets, amido group played a major role during the biosorption process, and this course did not alter any functional groups at all, as evidenced by fourier transform infrared spectroscopy, chemical modifications, and scanning electron microscope data. All the results indicated that the adsorbents performed well at lowering the possible limitations arising out of the poor stability and enhancing convenient operability.