Huang Xiangyu, Lee Cheng-Shiuan, Zhang Katherine, Alhamzani Abdulrahman G, Hsiao Benjamin S
Department of Chemistry, Stony Brook University, 100 Nicolls Road, Stony Brook, NY 11794, USA.
New York State Center for Clean Water Technology, Stony Brook University, Stony Brook, NY 11794, USA.
Nanomaterials (Basel). 2023 Mar 24;13(7):1161. doi: 10.3390/nano13071161.
A novel composite hydrogel bead composed of sodium alginate (SA) and aldehyde cellulose nanocrystal (DCNC) was developed for antibiotic remediation through a one-step cross-linking process in a calcium chloride bath. Structural and physical properties of the hydrogel bead, with varying composition ratios, were analyzed using techniques such as BET analysis, SEM imaging, tensile testing, and rheology measurement. The optimal composition ratio was found to be 40% (SA) and 60% (DCNC) by weight. The performance of the SA-DCNC hydrogel bead for antibiotic remediation was evaluated using doxycycline (DOXY) and three other tetracyclines in both single- and multidrug systems, yielding a maximum adsorption capacity of 421.5 mg g at pH 7 and 649.9 mg g at pH 11 for DOXY. The adsorption mechanisms were investigated through adsorption studies focusing on the effects of contact time, pH, concentration, and competitive contaminants, along with X-ray photoelectron spectroscopy analysis of samples. The adsorption of DOXY was confirmed to be the synergetic effects of chemical reaction, electrostatic interaction, hydrogen bonding, and pore diffusion/surface deposition. The SA-DCNC composite hydrogel demonstrated high reusability, with more than 80% of its adsorption efficiency remaining after five cycles of the adsorption-desorption test. The SA-DCNC composite hydrogel bead could be a promising biomaterial for future antibiotic remediation applications in both pilot and industrial scales because of its high adsorption efficiency and ease of recycling.
通过在氯化钙浴中一步交联工艺，制备了一种由海藻酸钠（SA）和醛基纤维素纳米晶体（DCNC）组成的新型复合水凝胶珠，用于抗生素修复。使用BET分析、扫描电子显微镜成像、拉伸测试和流变学测量等技术，分析了不同组成比例的水凝胶珠的结构和物理性质。发现最佳组成比例为按重量计40%（SA）和60%（DCNC）。在单药和多药系统中，使用强力霉素（DOXY）和其他三种四环素评估了SA-DCNC水凝胶珠对抗生素修复的性能，在pH值为7时，DOXY的最大吸附容量为421.5 mg/g，在pH值为11时为649.9 mg/g。通过吸附研究，重点关注接触时间、pH值、浓度和竞争性污染物的影响，以及对样品的X射线光电子能谱分析，研究了吸附机制。证实DOXY的吸附是化学反应、静电相互作用、氢键和孔扩散/表面沉积的协同作用。SA-DCNC复合水凝胶具有很高的可重复使用性，在吸附-解吸测试五个循环后，其吸附效率仍保留80%以上。由于其高吸附效率和易于回收，SA-DCNC复合水凝胶珠可能成为未来中试和工业规模抗生素修复应用中一种有前景的生物材料。
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