The Preparation Of Fungi Mycelium-based Composite Materials For Adsorption Characteristics

With the increasing emphasis on water pollution, researchers have developed a variety of techniques for removing organic dye and radionuclide from water. Recently, oil resources are are running out rapidly and polymer adsorbing materials are easy to produce secondary pollution. Biomass, a environmental compatibility and low cost material for wastewater treatment, has become an advanced research hotspot in the world. In this paper, hypha-based hybrid materials, as a kind of absorbent material for wastewater treatment, have been produced by the technique of fungus-induced assembly. Mycelium/CNT and mycelium/bayberry tannin hybrid materials will be got when carbon nanotubes and bayberry tannin added into liquid medium which have been innoculated by Xylaria. The hybrid materials which produced by the technique retain the fibrous microstructure of fungal hypha. Some modern analysis determination technique have been utilized for studying the physicochemical property of mycelium/CNT and mycelium/bayberry tannin hybrid materials. In order to evaluate the adsorptive property, mycelium/CNT is used for methyl violet and congo red adsorption and mycelium/bayberry tannin is for Sr(?). The results are summarized as below.1. In the process of mycelium/CNT hybrid materials formation, added CNT was fixed on the hypha surface and loading capacity would be increasing with more CNT having been added into liquid medium. Meanwhile, the presence of CNT is also improving thermal stability. Oxygen-containing groups which contained on the hybrid materials promote the contaminants adsorption. The adsorption performance of hybrid materials with different CNT content was evaluated for the removal of cation(methyl violet) and anion(congo red) dyes. The adsorption was controlled by pH, temperature, adsorption time and initial concentration solution. In the adsorption experiment, this hybrid material show excellent performances for dyes adsorption and experimental data obey a pseudo second-order model. For the congo red and methyl violet adsorption, adsorption isotherms fit the Langmuir model and Freundlich model, respectively. The adsorption capacities were about 43.99 mg/g and 20.89 mg/g. Compared first adsorption process, after five cycle, mycelium/CNT retained 78.2% and 82.9% adsorption capacity for congo red and methyl violet.2. After bayberry tannin added into fluid medium, polyhydroxy interaction lead bayberry tannin fixed on cell wall surface and network mycelium/bayberry tannin hybrid materials are formed. Hydroxy, carboxyl and amide which are contained on hybrid material surface can interact with metal ion. More tannin added into liquid medium, more tannin contained in hybrid materials. Further more, the hybrid materials were stability in acid solution. The mycelium/bayberry tannin hybrid material was used for Sr( ?) adsorption. The adsorption was controlled by pH, temperature, the concentration of NaCl, adsorption time and initial concentration solution. It is observed that pseudo-second-order model shows a better fitting toward mycelium/bayberry tannin. The experimental adsorption isotherms were better characterized by Freundlich isotherm model. The adsorption capacity was about 36.26 mg/g. Compared first adsorption process, after five cycle, mycelium and mycelium/bayberry tannin retained 80% adsorption capacity.