铆钉菇(Gomphidius viscidus)菌丝对Cu(Ⅱ)的生物吸附特性

在离体条件下研究了外生菌根真菌铆钉菇(Gomphidius viscidus)菌丝对Cu(Ⅱ)的吸附动力学和热力学特性,并采用二级动力学方程Freundlich和Langmuir吸附等温线模型拟合G.viscidus菌丝的生物吸附特性.同时,考察了G.viscidus菌丝在不同温度和Cu(Ⅱ)起始浓度下,各自对Cu(Ⅱ)吸附能力和吸附率所造成的影响.结果表明:G.viscidus活性菌丝在2h时达到最大吸附速率,16h时达到最大平衡吸附量,其主动吸附使得对Cu(Ⅱ)具有很高的平衡吸附比例;G.viscidus活性菌丝和非活性菌丝均对Cu(Ⅱ)具有很大的吸附量,分别为25℃时的15.12与36.13mg·g-1(以干重计)和30℃时的16.23与10.42mg·g-1(以干重计);G.viscidus非活性菌丝对Cu(Ⅱ)的吸附能力随温度升高而降低,G.viscidus活性菌丝则无显著变化;G.viscidus菌丝对Cu(Ⅱ)的吸附能力随Cu(Ⅱ)初始浓度增加而增大,吸附率随初始浓度增加而减小.

Characteristics of biosorption of Cu (II) by Gomphidius viscidus mycelium

Gomphidius viscidus mycelium was grown in vitro to determine the kinetics and thermodynamics its of Cu (Ⅱ) biosorption. The kinetics fit a second order kinetic equation, and the biosorption matched both the Freundlicb and Langmuir isotherm models. The effects of temperature and Cu (Ⅱ)concentration on Cu (Ⅱ) biosorption by G. viscidus mycelia were also investigated in this study. The maximum biosorption rate of active G. viscidus mycelium occurred at 2 h and the equilibrium biosorption capacity was reached after 16 h, with a very high biosorption ratio. The maximum adsorption of active G. viscidus mycelium and non-active G. viscidus roycelium were 15.12 and 36.13 mg·g~(-1) dry weight at 25℃ , and 16.23 and 10.42 mg·g~(-1) dry weight at 30℃ , respectively. The biosorption capacity of non-active G. viscidus mycelium decreased with temperature ; however, there was no significant temperature effect on the biosorption capacity of active G. viscidus mycelium. Increased initial concentration favored the biosorption capacity of G. viscidus mycelia, but hampered the biosorption rate.