A spherical cellulose adsorbent embedded with black wattle extract (SABW) was prepared by an inverse suspension method, and used to adsorb the typical food pigment, gardenia yellow pigment (GYP). Results of SEM, XRD, FTIR and BET characterization showed that SABW was composed of abundant porous structures and functional groups such as –CO, –OH and benzene ring groups. The batch adsorption experiments revealed that SABW presented excellent adsorption performance for GYP with a high adsorption percentage of 97.96%. The adsorption process followed the Langmuir and Freundlich adsorption isotherm, and the experimental data were in good agreement with the pseudo-second order dynamic model. Furthermore, the main adsorption mechanism involved hydrogen bonding, electrostatic interaction and pore adsorption. Importantly, the desorption and regeneration experiments showed that SABW had satisfactory reusability and retained 92.30% adsorption after 4 cycles. The above results provide a vital theoretical basis for the extraction of GYP.

中文翻译：

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嵌入式球形纤维素吸附剂对栀子黄色素的吸附行为

采用逆悬浮法制备了包埋黑荆树提取物（SABW）的球形纤维素吸附剂，用于吸附典型的食用色素栀子黄色素（GYP）。SEM、XRD、FTIR和BET表征结果表明，SABW由丰富的多孔结构和-C等官能团组成。O、-OH 和苯环基团。批量吸附实验表明，SABW 对 GYP 表现出优异的吸附性能，吸附率高达 97.96%。吸附过程遵循Langmuir和Freundlich吸附等温线，实验数据与准二级动力学模型吻合较好。此外，主要吸附机制涉及氢键、静电相互作用和孔吸附。重要的是，解吸和再生实验表明，SABW 具有令人满意的可重复使用性，并且在 4 个循环后保持 92.30% 的吸附。上述结果为GYP的提取提供了重要的理论依据。