Porous carbon aerogel derived from bacterial cellulose with prominent potential for efficient removal of antibiotics from the aquatic matrix

Abstract

The development of adsorption methods for the remediation of antibiotics pollution in water is hindered by the lack of high-performance sorbents. In this study, a nanofiber carbon aerogel was prepared using bacterial cellulose and its adsorption performances for three common antibiotics (norfloxacin, sulfamethoxazole, and chloramphenicol) in water were evaluated. The as-prepared nanofiber carbon aerogel showed a higher adsorption capacity toward target antibiotics compared to other adsorbents reported in the literature. The maximum adsorption capacities for norfloxacin, sulfamethoxazole, and chloramphenicol were 1,926, 1,264, and 525 mg/g, respectively at 298 K. Notably, the nanofiber carbon aerogel was able to adsorb 80% of the equilibrium adsorption capacity within 1 min and reach equilibrium within 15 min. After five regeneration cycles, the adsorption capacity still reached 1,166, 847, and 428 mg/g for norfloxacin, sulfamethoxazole, and chloramphenicol, respectively. The characterization results showed that the carbon aerogel exhibited a high specific surface area (1,505 m2/g) and a layered porous network structure. Furthermore, the mechanistic study reveals that the enhanced antibiotic adsorption by the as-prepared nanofiber carbon aerogel was attributed to the pore filling effect, hydrogen bonding, hydrophobic effect, electrostatic interaction, and π-π interactions. Overall, these results imply that low-cost and green nanofiber carbon aerogels may be promising adsorbents for the remediation of antibiotic-contaminated wastewater. The materials prepared from natural and readily available bacterial cellulose can adsorb antibiotics efficiently, which provides a reference for the development of adsorbent materials using natural substances.

Synthesis of Aminomethylpyridine-Decorated Polyamidoamine Dendrimer/Apple Residue for the Efficient Capture of Cd(II)

“…The promotion is due to the high driving force that is produced under high concentration, which shifts the adsorption−desorption balance in the adsorption direction. 53 For the influence of temperature, the adsorption of Cd(II) increases first and then decreases in the range of 15−35 °C. For instance, the adsorbed amount of AP-G1.0-AMP increases from 0.25 to 0.35 mmol•g −1 when the temperature rises from 15 to 25 °C, and then it decreases to 0.30 mmol•g −1 at 35 °C at a concentration of 0.0080 mmol•mL −1 .…”

“…The adsorption of Cd­(II) by AP-G2.0-AMP can be enhanced by 5.2 times under the same condition. The promotion is due to the high driving force that is produced under high concentration, which shifts the adsorption–desorption balance in the adsorption direction …”

Self-Assembled Aminated and TEMPO Cellulose Nanofibers (Am/TEMPO-CNF) Aerogel for Adsorptive Removal of Oxytetracycline and Chloramphenicol Antibiotics from Water

“…The results of our study indicate that the adsorption process of both antibiotics by Am/TEMPO-CNF involves mainly hydrogen bonding and electrostatic attraction (Figure 6). Hydrogen bonding could occur between the carboxyl and hydroxyl group of Am/TEMPO-CNF and the hydroxyl group and amide group of CAP [48]. The observed high adsorption capacity of CAP and OTC may be attributed to the occurrence of electrostatic interactions with the anionic sites of CAP and the phenolic diketone moiety anion of OTC, which possess a negative charge.…”

Preparation of Nanocellulose-Based Aerogel and Its Research Progress in Wastewater Treatment

“…Experiments on adsorption could maintain the removal rate of TC at about 97% after three cycles. Wei et al [138] will prepare bacterial cellulose (BC) aerogel by freeze-drying technique. Then it was put into a tube furnace for carbonization to finally obtain carbon-bacterial cellulose aerogel (BCCA).…”