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New Proposal in a Biorefinery Context: Recovery of Acetic and Formic Acids by Adsorption on Hydrotalcites
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.jced.0c00340 Beatriz Medeiros Travália 1 , Marcus Bruno Soares Forte 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-08-31 , DOI: 10.1021/acs.jced.0c00340 Beatriz Medeiros Travália 1 , Marcus Bruno Soares Forte 1
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Acetic acid (AA) and formic acid (FA) are two of the major fermentation inhibitors found in hemicellulosic hydrolysates. Their removal, which is necessary for the use of hydrolysates as fermentation substrates, can be achieved by adsorption on hydrotalcites. This study aimed to assess the efficiency of hydrotalcites in removing AA and FA from aqueous solution. Kinetic, thermodynamic, and equilibrium experiments were conducted using hydrotalcites composed of 30, 63, or 70% MgO. Calcined hydrotalcites composed of 70 and 63% MgO (MG70c and MG63c) had the best kinetic performance, removing 97% of FA and 91% of AA. The adsorption process followed pseudo-first-order kinetics. The Boyd model showed that external mass transfer or a combination of intraparticle diffusion and external mass transfer controls the process. Adsorption equilibrium was evaluated at different temperatures (30, 40, 50, and 60 °C) using MG70c as an adsorbent. The Freundlich model provided the best fit to adsorption isotherms. Thermodynamic studies indicated that adsorption was spontaneous and endothermic in nature. The results confirmed the efficiency of MG70c in removing AA and FA from aqueous solution.
中文翻译：
生物精炼领域的新建议：通过水滑石的吸附回收乙酸和甲酸
乙酸（AA）和甲酸（FA）是半纤维素水解物中发现的两种主要发酵抑制剂。可以通过吸附在水滑石上来去除它们，这对于使用水解产物作为发酵底物是必需的。这项研究旨在评估水滑石从水溶液中去除AA和FA的效率。使用由30％，63％或70％MgO组成的水滑石进行动力学，热力学和平衡实验。由70％和63％的MgO（MG70c和MG63c）组成的煅烧水滑石具有最佳的动力学性能，可去除97％的FA和91％的AA。吸附过程遵循拟一级动力学。博伊德模型表明，外部传质或粒子内扩散与外部传质的结合可控制该过程。使用MG70c作为吸附剂，在不同温度（30、40、50和60°C）下评估了吸附平衡。Freundlich模型为吸附等温线提供了最佳拟合。热力学研究表明吸附本质上是自发的并且是吸热的。该结果证实了MG70c从水溶液中去除AA和FA的效率。
更新日期：2020-09-10
中文翻译：
生物精炼领域的新建议：通过水滑石的吸附回收乙酸和甲酸
乙酸（AA）和甲酸（FA）是半纤维素水解物中发现的两种主要发酵抑制剂。可以通过吸附在水滑石上来去除它们，这对于使用水解产物作为发酵底物是必需的。这项研究旨在评估水滑石从水溶液中去除AA和FA的效率。使用由30％，63％或70％MgO组成的水滑石进行动力学，热力学和平衡实验。由70％和63％的MgO（MG70c和MG63c）组成的煅烧水滑石具有最佳的动力学性能，可去除97％的FA和91％的AA。吸附过程遵循拟一级动力学。博伊德模型表明，外部传质或粒子内扩散与外部传质的结合可控制该过程。使用MG70c作为吸附剂，在不同温度（30、40、50和60°C）下评估了吸附平衡。Freundlich模型为吸附等温线提供了最佳拟合。热力学研究表明吸附本质上是自发的并且是吸热的。该结果证实了MG70c从水溶液中去除AA和FA的效率。
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