Ge Yanhui, Zhou Ruibing, Wang Zhang, Zhang Xin, Wang Wen, Sun Hongwen, Zhang Lianying
Tianjin Key Laboratory of Hazardous Waste Safety Disposal and Recycling Technology, School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China.
Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Int J Biol Macromol. 2025 Sep;321(Pt 1):146229. doi: 10.1016/j.ijbiomac.2025.146229. Epub 2025 Jul 21.
Rapid industrial development has resulted in significant heavy metal pollution in water. An effective strategy for removing heavy metals is to utilize adsorbents; however, traditional adsorption methods face challenges such as slow adsorption rates and environmental risks. In the present study, we synthesized a novel edible adsorbent derived from microcrystalline cellulose (MCC) by grafting aspartic acid (ASP) and polyaspartic acid (PASP). The findings reveal that PASP-grafted MCC (PASP-MCC) exhibited superior efficacy in removing Cd(II) and Pb(II) from aqueous solutions, significantly outperforming ASP-grafted MCC (ASP-MCC) and pristine MCC. Cd(II) and Pb(II) were rapidly adsorbed on the amino acid-grafted MCC, and the process is best described by the pseudo-first-order model. According to the Langmuir model, the maximum adsorption capacities of PASP-MCC for Cd(II) and Pb(II) were 36.5 mg/g and 57.56 mg/g, respectively, representing 12.6-fold and 9.5-fold increase compared to pristine MCC. The adsorption mechanism of the amino acid-grafted MCC primarily involves complexation and physisorption. Safety and efficacy evaluation revealed that PASP-MCC significantly reduced the toxicity and accumulation of Cd(II) and Pb(II) in medaka fish. These important findings suggest that amino acid-grafted cellulose, particularly PASP-MCC, could serve as an effective edible heavy metal absorbent in aquaculture water and drinking water in the future.
快速的工业发展导致了水体中严重的重金属污染。去除重金属的一种有效策略是利用吸附剂；然而，传统的吸附方法面临着吸附速率缓慢和环境风险等挑战。在本研究中，我们通过接枝天冬氨酸（ASP）和聚天冬氨酸（PASP）合成了一种新型的由微晶纤维素（MCC）衍生的可食用吸附剂。研究结果表明，PASP接枝的MCC（PASP-MCC）在从水溶液中去除Cd（II）和Pb（II）方面表现出卓越的效果，显著优于ASP接枝的MCC（ASP-MCC）和原始MCC。Cd（II）和Pb（II）能快速吸附在氨基酸接枝的MCC上，该过程用准一级模型描述最为合适。根据朗缪尔模型，PASP-MCC对Cd（II）和Pb（II）的最大吸附容量分别为36.5mg/g和57.56mg/g，与原始MCC相比分别提高了12.6倍和9.5倍。氨基酸接枝的MCC的吸附机制主要涉及络合作用和物理吸附。安全性和有效性评估表明，PASP-MCC显著降低了青鳉鱼体内Cd（II）和Pb（II）的毒性和积累。这些重要发现表明，氨基酸接枝的纤维素，特别是PASP-MCC，未来可作为水产养殖用水和饮用水中一种有效的可食用重金属吸附剂。
