Hongru Chen , Yiyan Liu , Yunhan Zhang , Shaowei Luan , Wenchao Dai , Tianning Zhang , Dongjie Huang , Jiawei Lu , Yang Jiang , Dapeng Li
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引用次数: 0
Abstract
The development of simple and efficient novel adsorption technologies has made them highly attractive. However, the biosafety of adsorbents for human body and environment has gradually raised concerns, limiting their practical application scenarios. In this study, dragon fruit peel pectin (DFP) and gellan gum (GG) were used to construct environmentally friendly and highly biosafe dual network cross-linking cryogel (GG/DFP) as efficient adsorbent for Pb2+. Through texture, rheology and swelling experiments, it was demonstrated that the double crosslinking network structure formed by GG and DFP greatly enhanced the strength of cryogel. The crosslinking networks and porous structures were demonstrated by SEM and BET. Moreover, GG/DFP had a favorable Pb2+ adsorption capacity under different conditions, and the maximum adsorption amount was up to 93.56 mg/g. Adsorption kinetics results indicated that the pseudo-second-order model provided a better fit to the data. Adsorption equilibrium analysis was consistent with the Langmuir and Sips models. XPS analysis confirmed that it possessed multiple adsorption pathways such as physical adsorption, chelating, coordination, and ion-exchange. This work provides a promising alternative for the efficient and environmentally friendly removal of Pb2+ from water resources and human gastrointestinal tract, as well as new insights for the high-value utilization of dragon fruit peel waste.
期刊介绍:
Reactive & Functional Polymers provides a forum to disseminate original ideas, concepts and developments in the science and technology of polymers with functional groups, which impart specific chemical reactivity or physical, chemical, structural, biological, and pharmacological functionality. The scope covers organic polymers, acting for instance as reagents, catalysts, templates, ion-exchangers, selective sorbents, chelating or antimicrobial agents, drug carriers, sensors, membranes, and hydrogels. This also includes reactive cross-linkable prepolymers and high-performance thermosetting polymers, natural or degradable polymers, conducting polymers, and porous polymers.
Original research articles must contain thorough molecular and material characterization data on synthesis of the above polymers in combination with their applications. Applications include but are not limited to catalysis, water or effluent treatment, separations and recovery, electronics and information storage, energy conversion, encapsulation, or adhesion.