Noormohamadi Hamid Reza, Fat'hi Mohammad Reza, Ghaedi Mehrorang, Ghezelbash Gholam Reza
Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Department of Chemistry, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran.
Chemosphere. 2019 Feb;216:124-130. doi: 10.1016/j.chemosphere.2018.10.113. Epub 2018 Oct 17.
The present study aimed to analyze simultaneous biosorption of Cd and Ni by living Phanerochaete chrysosporium as low-cost and eco-friendly biosorbent following optimization by applying a central composite design. The effect of operating parameters such as solution pH (4.0-8.0), temperature (20-40 °C), contact time (3-15 h), initial Cd and Ni concentrations (15-35, 5-25 mg L, respectively) was evaluated by response surface methodology (RSM) for optimizing biosorption process. The Cd and Ni ions at 25 and 16 mg L were accumulated in P. chrysosporium with the efficiency of 96.23% and 89.48%, respectively, at pH of 6 and 36 °C after around 9 h under well mixing. The equilibrium data were fitted well with Langmuir isotherm model with maximum biosorption capacity of 71.43 and 46.50 mg g for Cd and Ni, respectively. In addition, the pseudo-second order kinetic model could describe the kinetic data adequately. Further, possible interaction pathway among metals and P. chrysosporium functional groups were studied by Fourier transform infrared (FT-IR) spectroscopy. Furthermore, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) techniques were applied for morphology investigation and semi elemental analysis.
本研究旨在通过应用中心复合设计进行优化后，分析活的黄孢原毛平革菌作为低成本且环保的生物吸附剂对镉和镍的同时生物吸附。采用响应面法（RSM）评估了溶液pH值（4.0 - 8.0）、温度（20 - 40 °C）、接触时间（3 - 15 h）、初始镉和镍浓度（分别为15 - 35、5 - 25 mg L）等操作参数对生物吸附过程优化的影响。在充分混合的情况下，经过约9小时，在pH值为6、温度为36 °C时，黄孢原毛平革菌对25和16 mg L的镉和镍离子的累积效率分别为96.23%和89.48%。平衡数据与朗缪尔等温线模型拟合良好，镉和镍的最大生物吸附容量分别为71.43和46.50 mg g。此外，伪二级动力学模型能够充分描述动力学数据。此外，通过傅里叶变换红外（FT - IR）光谱研究了金属与黄孢原毛平革菌官能团之间可能的相互作用途径。此外，应用扫描电子显微镜（SEM）和能量色散X射线光谱（EDS）技术进行形态学研究和半元素分析。
