污染控制技术及原理
王宝娥.CMC固定化灭活烟曲霉小球吸附活性艳蓝KN-R——批式实验与热力学[J].环境科学学报,2008,28(1):83-88
CMC固定化灭活烟曲霉小球吸附活性艳蓝KN-R——批式实验与热力学
- Biosorption of reactive brilliant blue KN-R by inactive Aspergillus fumigatus immobilized on CMC beads:Batch studies and thermodynamics
- 摘要：利用羧甲基纤维素钠(CMC)固定化灭活烟曲霉小球对活性艳蓝KN-R溶液进行吸附脱色实验,考察了不同条件下对103.4mg·L-1活性艳蓝KN-R的吸附效果,探讨了吸附热力学.结果表明,48h内对103.4mg·L-1活性艳蓝KN-R溶液达到吸附平衡.对于吸附溶液最佳初始pH值为10.5.温度在10℃～50℃范围内时,温度越高,吸附量越大.此外,CMC固定化灭活烟曲霉小球投加量为1%～5%时,随着投加量的增加吸附率由54.2%逐步增加到94.9%,而吸附量由54.7mg·g-1逐步降低到19.6mg·g-1.较高的盐度对吸附量的影响不大,NaCl浓度从0%增至3%时,吸附量仅下降了5.6mg·g-1.10℃～50℃温度范围内的热力学参数焓变(ΔH)值为15.343kJ·mol·K-1、熵变(ΔS)值为0.0607kJ·mol-1·K-1,自由能变(ΔG)值小于0.因此,CMC固定化灭活烟曲霉小球吸附活性艳蓝KN-R的过程是一个自发进行的吸热过程,吸附过程中染料分子在固/液界面随意运动性能增加不大.
- Abstract：Batch studies and thermodynamics of biosorption of reactive brilliant KN-Rby inactive Aspergillus fumigatus immobilized on sodium carboxymethylcellulose(CMC)beads were investigated.The results showed that the inactive Aspergillus fumigatus immobilized on CMCbeads could effectively decolorize a solution containing103.4 mg L-1 reactive brilliant blue KN-Rby biosorption within the equilibrium time,viz.48 h.The optimal initial pHof the dye solution was 10.5.The biosorption capacity increased with increasing temperature in the range of 10～50℃.In the beads dosage range of 1%～5%(wt %),the biosorption efficiency increased from 54.2% to 94.9%,but the biosorption capacity decreased from 54.7 mg·g-1 to 19.6 mg·g-1 after 48 h equilibrium.High salinity in dye solutions had little influence on biosorption capacity.The biosorption capacity decreased only 5.6 mg·g-1 at the NaCl concentrations in the range of 0% ～3.0%(wt %).The thermodynamics parameters values such as Gibb's free energy changes(ΔG),enthalpy changes(ΔH)and entropy changes(ΔS)over the temperature range of 10～50℃ were:ΔG less than 0,ΔH 15.343kJ·mol-1 and ΔS 0.0607 kJ·mol-1· K-1.These values indicate that the biosorption process by inactive A.fumigatus immobilized on CMC beads was spontaneous and endothermic.The dye molecules movements increased slightly in randomness at the solid/liquid interface during the sorption of dye on the biosorbent.
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