Biosorption Of Copper(Ⅱ) And Uranium(Ⅵ) From Aqueous Solution By The Marine-derived Mangrove Endophytic Fungus Fusarium Sp.#ZZf51

Heavy metal is a kind of pollutant with high toxicity in ecological environment.Some dissolved heavy metal ions can be concentrated in aquatic food chains, and thusbrings about serious toxic effect to environment and human beings. In recent decades,many scholars both at home and abroad have conducted lots of researches into theremoval of heavy metals, and the main methods to remove the heavy metals includechemical and physical methods, which are of expensive and easily cause secondarypollution. So biological methods to remove heavy metals are becoming research hotspot in recent years due to its high efficient and low cost.This thesis employs the mangrove endophytic fungus of Fusarium sp.#ZZF51,as the biosorbent to remove of copper(II) ions and uranium (VI) ions in waste water, itwill explore a high efficiency, economical and environmentally friendly newtreatment agents. It also has a reference and guidance impact on innovation of thenuclear environment of our current governance and bioremediation of heavy metalspollution in the relevant geographic evaluation, prediction and control. Its maincontents and results are as follows:In the first chapter, the study the copper and uranium wastewater relatedknowledge, research significance and basic contents, and knowledge of the biologicaladsorption were introduced in brief.In the second chapter, the copper(II) biosorption was studied in detail by usingthe biomass of mangrove endophytic fungus Fusarium sp.#ZZF51from the SouthChina Sea, the results show that copper(II) ions biosorption optimized condition waspH6.5onto the test fungus powders; and the adsorption rate higher, the adsorptionrate is rapid increase within60min, and the biosorption equilibrium time was90min.The adsorption capacity and adsorption were rate rapidly increased when the copper(II) ions concentration under20mg/L, and copper(II) ions initial concentration50mg/L with82.14%of removal efficiency and20.53mg/g of biosorption capacity.The experimental data were analyzed by using adsorption isotherms and kineticmodels, and it was obtained that the Langmuir isotherm model and thepseudo-second-order kinetic model provided better correlation with the experimentaldata for adsorption of copper(Ⅱ). In addition, the biosorption mechanism was alsoanalyzed and discussed, that was hydroxyl and carbonyl groups both acted as theimportant roles in the adsorption process according to Fourier transform infraredspectra for the tested fungus before and after loaded with copper(Ⅱ).In the third chapter, the accumulation of uranium(VI) by the mangroveendophytic fungus Fusarium sp.#ZZF51from the South China Sea was studied indetail, the results indicated that the uranium(VI) ions biosorption process onto thetested fungus powders was equilibrium time was60min, optimized at pH value4.0,and uranium(VI) initial concentration50mg/L with61.89%of removal efficiency and15.46mg/g of adsorption capacity. In addition, the experimental data were analyzedby using parameter and kinetic models, and it was obtained that the Langmuirisotherm model and the pseudo-second-order kinetic model provided bettercorrelation with the experimental data for adsorption of uranium (VI). According toFourier transform infrared spectra for the tested fungus before and after loaded withuranium(VI), the results showed that both of hydroxyl and carboxyl groups acted asthe important roles in the adsorption process.In the fourth chapter, the fungus Fusarium sp.#ZZF51adsorption of copper(II)ions and uranium (VI) ions the results were compated.In the fifth chapter, the results were summarized and further study proposalswere put forward.