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Sorption behavior of freshwater aquatic fern Azolla filiculoides on redwine dye

机译：淡水水生蕨类固氮菌对红葡萄酒染料的吸附行为

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The biosorption of redwine dye from aqueous solution onto aquatic fern Azolla filiculoides has been studied. The factors affecting the sorption process, such as solution pH, contact time and initial concentration, adsorbent size, and dosage were determined in the batch mode. Equilibrium sorption isotherms and kinetics were investigated. Sorption isotherm data were fitted with Langmuir and Freundlich models and Langmuir monolayer coverage was determined as 86.21 mg/g. The kinetic data obtained at different initial concentrations were analyzed using pseudo-first-order and pseudo-second-order equations. Biosorption mechanism using Boyd's plot confirmed the film diffusion was the rate-limiting step. The morphological characteristics and functional groups responsible for the binding of dyes were done using Scanning Electron Microscopy and Fourier Transform Infrared Spectroscopy analysis, respectively. The ability of A. filiculoides to remove redwine dye from aqueous solution was also examined in an up-flow packed column (continuous mode) at different experimental conditions. The maximum uptake (5.4 mg/g) was obtained at bed height of 15 cm, flow rate of 2mL/min, and initial dye concentration of 70mg/L. The Bed Depth Service Time, Thomas, and Yoon and Nelson models were used to analyze the experimental data and the model parameters were evaluated. Thus, A. filiculoides has a potential to be a biosorbent for the removal of reactive redwine dye from aqueous solutions.
机译：已经研究了红葡萄酒染料从水溶液到水生蕨类植物Azolla filiculoides的生物吸附。以分批方式确定影响吸附过程的因素，例如溶液的pH，接触时间和初始浓度，吸附剂的大小和用量。研究了平衡吸附等温线和动力学。用Langmuir和Freundlich模型拟合吸附等温线数据，确定Langmuir单层覆盖率为86.21 mg / g。使用伪一级方程和伪二级方程分析了在不同初始浓度下获得的动力学数据。使用博伊德图的生物吸附机理证实了膜扩散是限速步骤。分别使用扫描电子显微镜和傅立叶变换红外光谱分析完成负责染料结合的形态学特征和官能团。还在不同实验条件下的上流式填充柱（连续模式）中检查了丝状农杆菌从水溶液中去除红葡萄酒染料的能力。在床高15 cm，流速2mL / min和初始染料浓度70mg / L时获得最大吸收量（5.4 mg / g）。使用床深度服务时间，Thomas，Yoon和Nelson模型来分析实验数据并评估模型参数。因此，丝状农杆菌具有成为从水溶液中去除反应性红葡萄酒染料的生物吸附剂的潜力。

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