Abstract Due to their bioavailability, lignocellulosic materials have gained increasing attention, and several chemical treatments been performed to promote modifications in their structure. Alkaline treatment promotes modifications in native cellulose and adds alkaline groups to the surface of the material, potentiating its use as an adsorbent. In this study, the effect of alkaline treatment with 2‑aminopropane (C3H9N 10% m v−1) and sodium hydroxide (NaOH 10% m v−1) on the fruit peel of Pachira aquatic Aubl. was evaluated, generating PBO and PBI samples, respectively. The samples were characterized by Fourier Transform Infrared spectroscopy (FTIR), X-ray diffraction (XRD), Scanning electronic microscopy (SEM), thermal analysis, point of zero charge, crystallinity index, moisture content and the alkaline groups were determined using the Boehm's method. The results show that organic alkaline treatment decreased the crystallinity of the material, while the inorganic alkaline treatment added alkaline groups to the surface of the sample.

中文翻译：

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碱处理对Pachira水生Aubl.果皮的影响：理化评价和表征

摘要 由于其生物利用度，木质纤维素材料越来越受到关注，并且进行了多种化学处理以促进其结构的改变。碱处理促进了天然纤维素的改性，并在材料表面添加了碱性基团，增强了其作为吸附剂的用途。在本研究中，2-氨基丙烷（C3H9N 10% m v-1）和氢氧化钠（NaOH 10% m v-1）碱处理对 Pachira 水生 Aubl 果皮的影响。进行评估，分别生成 PBO 和 PBI 样本。样品通过傅里叶变换红外光谱 (FTIR)、X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、热分析、零电荷点、结晶度指数、水分含量和碱性基团进行表征，使用 Boehm ' s 方法。结果表明，有机碱处理降低了材料的结晶度，而无机碱处理在样品表面增加了碱性基团。