从废活性污泥中生物吸附剂对重金属的吸附特性和机理的新认识。
New insight into adsorption characteristics and mechanisms of the biosorbent from waste activated sludge for heavy metals.
机构信息
Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287, USA.
Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
出版信息
J Environ Sci (China). 2016 Jul;45:248-56. doi: 10.1016/j.jes.2016.03.007. Epub 2016 Apr 3.
The adsorption characteristics and mechanisms of the biosorbent from waste activated sludge were investigated by adsorbing Pb(2+) and Zn(2+) in aqueous single-metal solutions. A pH value of the metal solutions at 6.0 was beneficial to the high adsorption quantity of the biosorbent. The optimal mass ratio of the biosorbent to metal ions was found to be 2. A higher adsorption quantity of the biosorbent was achieved by keeping the reaction temperature below 55°C. Response surface methodology was applied to optimize the biosorption processes, and the developed mathematical equations showed high determination coefficients (above 0.99 for both metal ions) and insignificant lack of fit (p=0.0838 and 0.0782 for Pb(2+) and Zn(2+), respectively). Atomic force microscopy analyses suggested that the metal elements were adsorbed onto the biosorbent surface via electrostatic interaction. X-ray photoelectron spectroscopy analyses indicated the presence of complexation (between -NH2, -CN and metal ions) and ion-exchange (between -COOH and metal ions). The adsorption mechanisms could be the combined action of electrostatic interaction, complexation and ion-exchange between functional groups and metal ions.
采用吸附 Pb(2+)和 Zn(2+)的方法，研究了从废活性污泥中提取的生物吸附剂的吸附特性和机理。金属溶液的 pH 值为 6.0 有利于生物吸附剂的高吸附量。发现生物吸附剂与金属离子的最佳质量比为 2。通过将反应温度保持在 55°C 以下，可以实现更高的吸附量。响应面法被应用于优化生物吸附过程，所建立的数学方程具有较高的确定系数（两种金属离子均高于 0.99），且不存在显著的失拟（p 值分别为 0.0838 和 0.0782）。原子力显微镜分析表明，金属元素通过静电相互作用吸附在生物吸附剂表面上。X 射线光电子能谱分析表明存在络合（-NH2、-CN 和金属离子之间）和离子交换（-COOH 和金属离子之间）。吸附机理可能是官能团与金属离子之间的静电相互作用、络合和离子交换的共同作用。
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