Lihong Fan1, Yuqing Lu1, Li-Ye Yang1, Fangfang Huang1, Xiao-Kun Ouyang2. 1. School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China. 2. School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan 316022, PR China. Electronic address: xkouyang@zjou.edu.cn.
Abstract
HYPOTHESIS: We synthesized composite microspheres from cellulose nanocrystal (CNC), polyvinyl alcohol (PVA), and sodium alginate (SA), which were modified with polyethyleneimine (PEI) to introduce a high density of active amino sites onto the surface via the Schiff base reaction. We hypothesized that these (SA/CNC/PVA)@PEI microspheres would have a high adsorption capacity for aqueous diclofenac sodium (DS). EXPERIMENTS: The PEI-modified composite microspheres were characterized and assessed and optimized for aqueous DS adsorption. In addition, the morphology and synthesis mechanism of the adsorbent were studied. FINDINGS: The adsorption process showed a good fit with the pseudo-second-order kinetic model (i.e., the process is driven by a chemical adsorption mechanism) and Langmuir adsorption isotherm model (i.e., adsorption follows a single-layer process). Under the optimum experimental conditions (pH: 4.5, adsorption time: 50 min, temperature: 303 K), the maximum adsorption capacity was 418.4104 mg/g, which was relatively high compared to other reported adsorbents. Importantly, after five adsorption-desorption cycles, (SA/CNC/PVA)@PEI showed only a slight loss in adsorption capacity. Compared with other reported adsorbents, the core-shell composite has a good DS adsorptive capacity and high recyclability.
HYPOTHESIS: We synthesized composite microspheres from cellulose nanocrystal (CNC), polyvinyl alcohol (PVA), and sodium alginate (SA), which were modified with polyethyleneimine (PEI) to introduce a high density of active amino sites onto the surface via the Schiff base reaction. We hypothesized that these (SA/CNC/PVA)@PEI microspheres would have a high adsorption capacity for aqueous diclofenac sodium (DS). EXPERIMENTS: The PEI-modified composite microspheres were characterized and assessed and optimized for aqueous DS adsorption. In addition, the morphology and synthesis mechanism of the adsorbent were studied. FINDINGS: The adsorption process showed a good fit with the pseudo-second-order kinetic model (i.e., the process is driven by a chemical adsorption mechanism) and Langmuir adsorption isotherm model (i.e., adsorption follows a single-layer process). Under the optimum experimental conditions (pH: 4.5, adsorption time: 50 min, temperature: 303 K), the maximum adsorption capacity was 418.4104 mg/g, which was relatively high compared to other reported adsorbents. Importantly, after five adsorption-desorption cycles, (SA/CNC/PVA)@PEI showed only a slight loss in adsorption capacity. Compared with other reported adsorbents, the core-shell composite has a good DS adsorptive capacity and high recyclability.
Authors: Maria I Swasy; Beau R Brummel; Chandima Narangoda; Mohamed F Attia; Joshua M Hawk; Frank Alexis; Daniel C Whitehead Journal: RSC Adv Date: 2020-12-15 Impact factor: 4.036
Authors: Hyunsoo Kim; Oyunbileg Purev; Eunji Myung; Nagchoul Choi; Kanghee Cho Journal: Int J Environ Res Public Health Date: 2022-07-25 Impact factor: 4.614
Authors: Glaydson Simões Dos Reis; Davide Bergna; Sari Tuomikoski; Alejandro Grimm; Eder Claudio Lima; Mikael Thyrel; Nils Skoglund; Ulla Lassi; Sylvia H Larsson Journal: ACS Omega Date: 2022-09-02