The removal of Pb(II) from water by biosorption processes onto malt bagasse was investigated and the kinetic and thermodynamic parameters were obtained; additionally a diffusion modeling was proposed. The characterization of malt bagasse was performed by FTIR and SEM/EDS. The experiments were conducted in batch system and an experimental design based response surface methodology was applied for agitation speed and pH optimization. The kinetics of biosorption followed pseudo-second-order model and the temperature of the process affected the biosorption capacity. Isotherm models of Langmuir, Freundlich, and Elovich were applied and the Langmuir model showed better fit and the estimated biosorption capacity was 29.1 mg g⁻¹. The negative values obtained for and positive values of confirm, respectively, the spontaneous and endothermic nature of the process. The diffusion modeling was performed based on experiments in the absence of agitation to investigate the influence of the biosorbent on the sorption process of Pb(II) ions.

中文翻译：

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麦芽蔗渣对Pb（II）的生物吸附和扩散模拟

研究了通过在麦芽蔗渣上的生物吸附过程从水中去除Pb（II）的过程，并获得了动力学和热力学参数。另外，提出了扩散模型。麦芽蔗渣的表征是通过FTIR和SEM / EDS进行的。实验在间歇系统中进行，并且基于实验设计的响应面方法被应用于搅拌速度和pH优化。生物吸附动力学遵循伪二级模型，过程温度影响生物吸附能力。应用Langmuir，Freundlich和Elovich的等温线模型，Langmuir模型显示出更好的拟合度，估计的生物吸附能力为29.1 mg g ^-1。获得的负值和的正值分别确认该过程的自发性和吸热性。在没有搅拌的情况下，基于实验进行了扩散建模，以研究生物吸附剂对Pb（II）离子吸附过程的影响。