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首页> 外文期刊>Journal of Chemical Technology & Biotechnology >Activated carbons from peach stones and pine sawdust by phosphoric acid activation used in clarification and decolorization processes
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Activated carbons from peach stones and pine sawdust by phosphoric acid activation used in clarification and decolorization processes

机译：桃石和松木屑中的磷酸通过磷酸活化得到的活性炭，用于澄清和脱色过程

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BACKGROUND: A comparative study of the influence of preparation variables in the activation of pine sawdust and peach stones with phosphoric acid is presented. Adsorptive properties of these materials were tested for the clarification of apple juice and the decolorization of red wine. The main objective of this study was to identify the influence of the textural and chemical properties of activated carbons on clarification and decolorization processes. RESULTS: The role of impregnation conditions in porosity development was more important for activated carbons originating from peach stones than in those originating from pine sawdust, mainly due to their morphological differences. The amount of phosphoric acid retained on the precursors was found to be a function of the impregnation variables. Furthermore, porosity development dependence on phosphoric acid content per gram of precursor was confirmed. For both precursors, the best microporosity development was obtained at a heat treatment temperature of 450 °C. Independently of the preparation variables used, activated carbons from pine sawdust and peach stones had the same type of surface functional groups: mainly phenolic, quinonic and phosphoric ester-like structures. CONCLUSIONS: From the results of clarifications and decolorization tests, it was confirmed that to obtain good performance in these assays, the development of mesoporosity is crucial. However, when activated carbons had similar mesoporosities, the presence of surface functional groups contributed to improved performance in clarification and decolorization process.
机译：背景：比较了制备变量对磷酸活化松木屑和桃子结石的影响的比较研究。测试了这些材料的吸附性能，以澄清苹果汁和红酒脱色。这项研究的主要目的是确定活性炭的质地和化学性质对澄清和脱色过程的影响。结果：浸渍条件在孔隙发展中的作用比起源自桃木屑的活性炭，比起源自桃木屑的活性炭更重要。发现保留在前体上的磷酸的量是浸渍变量的函数。此外，证实了孔隙发展依赖于每克前体的磷酸含量。对于这两种前体，在450°C的热处理温度下可获得最佳的微孔性。与所使用的制备变量无关，松木屑和桃子石的活性炭具有相同类型的表面官能团：主要是酚，奎宁和磷酸酯样结构。结论：从澄清和脱色试验的结果可以证实，要在这些试验中获得良好的性能，介孔性的发展至关重要。但是，当活性炭具有类似的介孔率时，表面官能团的存在有助于改善澄清和脱色过程的性能。

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