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>Efficient decolorization of citric acid fermentation broth using carbon materials prepared from phosphoric acid activation of hydrothermally treated corncob
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Efficient decolorization of citric acid fermentation broth using carbon materials prepared from phosphoric acid activation of hydrothermally treated corncob
Conventional activated carbon used in decolorization of citric acid fermentation broth has the disadvantage of high citric acid loss. In this study, a novel biomass-based carbon material, namely HBCM, was prepared via H3PO4 activation of hydrothermally treated corncob. The material was fully characterized by SEM, BET, TG, FTIR, XPS and pHpzc. The results showed that the material's SBET was as high as 1720 m2 g?1 and several weak-acid functional groups existed on its surface, which contributed to efficient decolorization with low citric acid loss. By adjusting the solution pH value to around 7, nearly no citric acid was lost. Furthermore, the adsorption behavior of pigments on HBCM was systematically investigated under optimized pH. The results indicated that the adsorption was spontaneous and endothermic. Intra-particle diffusion was the rate-limiting step. By comparing FTIR data before and after adsorption, it was found that oxygen-containing functional groups on the HBCM surface participated in pigment adsorption. Overall, the tailor-made HBCM performed excellently with a 99% decolorization ratio and nearly no citric acid loss under optimum operating conditions. It could be a potential adsorbent in the removal of pigments from citric acid fermentation broth.
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机译：用于柠檬酸发酵液脱色的常规活性炭具有柠檬酸损失高的缺点。在这项研究中，通过 H 3 PO 4 制备了一种新型的基于生物质的碳材料，即HBCM。 / sub> 活化的水热处理玉米芯。通过SEM，BET，TG，FTIR，XPS和pH pzc 对该材料进行了全面表征。结果表明，该材料的 S BET 高达1720 m 2 g ？1 及其表面存在多个弱酸官能团，有助于柠檬酸损失少，有效脱色。通过将溶液的pH值调节到7左右，几乎没有柠檬酸损失。此外，系统地研究了在最佳pH下颜料在HBCM上的吸附行为。结果表明，吸附是自发的并且是吸热的。颗粒内扩散是限速步骤。通过比较吸附前后的FTIR数据，发现HBCM表面的含氧官能团参与了颜料的吸附。总体而言，量身定制的HBCM在最佳操作条件下表现出色，具有99％的脱色率，几乎没有柠檬酸损失。它可能是从柠檬酸发酵液中去除色素的潜在吸附剂。
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