1. Effective melanoidin adsorption of polyethyleneimine- functionalised molasses-based porous carbon: Adsorption behaviours and microscopic mechanisms.
- Author
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Fan, Bo-Huan, Xiong, Yan-Shu, Li, Ming-Xing, Jia, Ran, Zhou, Li-Shu, Tang, Jia-Yi, Li, Wen, Lan, Yu-Wei, Lu, Hai-Qin, and Li, Kai
- Subjects
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ADSORPTION (Chemistry) , *ADSORPTION capacity , *MASS transfer , *FOOD industry , *CHEMISORPTION , *DIFFUSION - Abstract
[Display omitted] • • Porous carbon material (PMPC) was prepared from cane molasses as carbon source. • • PMPC shows excellent adsorption capacity for melanoidins in cane juice (550.00 mg/g). • • Two novel mass transfer resistance models were applied to elaborate the micro-mechanisms. • • The chemisorption and physisorption rates were accurately quantified throughout the adsorption process. • • Chemisorption is the main adsorption mechanism followed by other weak interactions. Sugar industry is an integral part of the food and agriculture sector of the national economy. Cane juice decolourisation is a crucial process in sugar production that directly impacts the final colour value of the sugar. However, the chemicals used in traditional methods may be harmful for food safety. Thus, advanced and effective alternatives methods should be developed to further address the problems on sugar production and quality. In this study, polyethyleneimine-functionalised molasses - based porous carbon (PMPC) was prepared from cane molasses, and was reversely applied to remove melanoidins from cane juice. The melanoidin removal efficiency by PMPC was 91.66% with the adsorption capacity of 550.00 mg/g in the adsorption equilibrium state. From the adsorption thermodynamics analysis, the adsorption process of melanoidins onto PMPC was spontaneous and endothermic. Analysis of the interaction mechanisms demonstrated that the successful adsorption of melanoidins by PMPC was mainly achieved through the electrostatic interations and other weak interactions (hydron-bond interaction), and a melanoidin molecule can be bonded with three to four protonated amine groups of PMPC. In addition, the mass transfer behaviour of the melanoidins adsorbed onto PMPC was determined using the mixed model of external and internal diffusion resistance, and the active-onto-site adsorption model. The results showed the melanoidins adsorbed by PMPC was a multilayer adsorption process dominated by chemisorption. Therefore, PMPC was proved to be an ideal adsorbent for cane juice decolourisation, with the advantages of green, high efficiency, and recyclability. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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