擴展DLVO理論
(中南大學 資源加工與生物學院， 長沙 410083)
摘 要: 根據(jù)Young's方程的推導公式結(jié)合接觸角的測定結(jié)果計算黃鐵礦和氧化亞鐵硫桿菌的表面能參數(shù)。結(jié)果表明， 氧化亞鐵硫桿菌的表面能明顯高于黃鐵礦的表面能。 應用熱力學計算氧化亞鐵硫桿菌在黃鐵礦表面吸附的自由能， 發(fā)現(xiàn)其吸附自由能為正值， 無法解釋氧化亞鐵硫桿菌在黃鐵礦表面的吸附現(xiàn)象，而通過擴展DLVO理論建立的Lifshitz-van der Waals（LW）、 Lewis acid-base(AB) 和靜電（EL）作用自由能與作用距離（d）之間的勢能曲線， 能夠準確的預言氧化亞鐵硫桿菌在黃鐵礦表面的吸附現(xiàn)象。
關(guān)鍵字: 黃鐵礦; 氧化亞鐵硫桿菌；擴展DLVO理論； 表面能
（School of Resource Processing and Bioengineering,
Central South University, Changsha 410083, China）
Abstract: Surface energy parameters of pyrite mineral and Thiobacillus ferrooxidans were obtained by calculating according to deduced formula of Young's equation and contact angel. The results show that surface energy of Thiobacillus ferrooxidans is much higher than that of pyrite mineral. By thermodynamics approach, the interaction free energy of Thiobacillus ferrooxidans absorbed on the surface of pyrite was a positive value, which can not explain the adhesion behavior of the bacteria. However, the adhesion behavior can be exactly predicted by the potential energy graph of Lifshitz-van der Waals(LW) and Lewis acid-base(AB) and EL interfacial free energy as a function of separation distance(d), which were established on the base of extended DLVO theory.
Key words: pyrite mineral; Thiobacillus ferrooxidans; extended DLVO theory； surface energy
