Abstract
Separation and purification of active components from biomass by inorganic materials during the pretreatment process of hydrothermal conversion are studied in this work. The batch experiment results show that an initial solution pH of 6 favors chelerythrine adsorption, and the optimum adsorbent dosage is 2.0 g. The adsorption mechanism of ZSM-5 for chelerythrine is investigated by adsorption kinetics, isotherm adsorption models, and thermodynamics analysis. The results show that the kinetics data fit the pseudo-second-order model well (R2 = 0.9991), and the intraparticle diffusion model has 3 diffusion stages, preliminarily indicating that chemisorption plays a major role in the adsorption process, and the sorption mechanism includes intraparticle, external, and boundary diffusion. The adsorption isotherms agree well with the Langmuir model, indicating the occurrence of monolayer molecular adsorption during the adsorption process. Meanwhile, the maximum adsorption capacity is 2.327, 2.072, and 1.877 mg/g at different temperatures (288 K, 298 K, and 308 K), respectively. The thermodynamic data demonstrate that the adsorption process is exothermic and spontaneous in nature. These observed results clearly confirm that ZSM-5 has potential superior properties for the enrichment and purification of alkaloids during the pretreatment of biomass.
Highlights
As a renewable carbohydrate found in nature, is a promising alternative to petroleum resources for the production of fuels, carbon-based chemicals, and materials [1, 2]. e pretreatment process of biomass before transformation is important owing to the presence of various active components in biomass. erefore, isolating and purifying the active components from the pretreatment process of biomass are of great signi cance
There are few reports on the application of molecular sieves in the field of separation and purification of plant active ingredients. erefore, the adsorption of lycorine and galantamine by ZSM-5 molecular sieves from Lycoris radiata Herb. was reported in our previous study [24]; the results showed that the adsorption and desorption performance of lycorine and galantamine by molecular sieves was superior to those obtained using resin, which indicates that the application of molecular sieves in the separation and purification of active components from medicinal herb ingredients is promising. erefore, to clarify the adsorption performance and mechanism of ZSM-5 towards active ingredients from plants, an alkaloid (CHE) was selected for use as a target and ZSM-5 was selected as an adsorbent
Batch experiments were used to study the optimal adsorption dose and initial solution pH. e adsorption kinetics, isotherms, and thermodynamics were investigated to explore the adsorption performance and mechanism of CHE on ZSM-5, and the technology described in this work is expected to be applied to isolate and purify the active ingredients from the pretreatment process of biomass
Summary
As a renewable carbohydrate found in nature, is a promising alternative to petroleum resources for the production of fuels, carbon-based chemicals, and materials [1, 2]. e pretreatment process of biomass before transformation is important owing to the presence of various active components (e.g., avonoids and alkaloids) in biomass. erefore, isolating and purifying the active components from the pretreatment process of biomass are of great signi cance. E pretreatment process of biomass before transformation is important owing to the presence of various active components (e.g., avonoids and alkaloids) in biomass. Erefore, isolating and purifying the active components from the pretreatment process of biomass are of great signi cance. Toddalia asiatica (L.) Lam. represents a better starting material to access CHE since Toddalia asiatica (L.) Lam. is available in nature and contains high amount of CHE. Erefore, it is very interesting to sustainably obtain CHE from Toddalia asiatica (L.) Lam. the residue after extraction can be used as a raw material for the production of value-added chemicals and biofuels, which enables the full utilization of Toddalia asiatica (L.) Lam. to be possible. The high requirements for chromatographic equipment are not conducive to industrial applications. erefore, developing a suitable carrier that is e cient and environmentally friendly for the enrichment and puri cation of alkaloids is necessary
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