Abstract
This study investigated the fabrication of zeolitic–imidazolate framework (ZIF-8) and ZIF-8-derived porous carbon and their application in the adsorptive removal of tetracycline from water. The materials were analysed by X-ray photoelectron spectroscopy, scanning electron microphotography, and the measurement of pH point of zero charge. The results indicated the presence of N-doped carbon network and functional groups on ZIF-8-derived porous carbon. Response surface methodology was used for statistical analysis. The effect of operating parameters involving tetracycline concentration (25–100 mg/L), dose (0.05–0.75 g/L), and pH (4–10) were conducted. The results indicated that the quadratic regression models were statistically significant and the parameters of tetracycline concentration and adsorbent dose profoundly affected the adsorption capacity. The optimum conditions for adsorption of tetracycline were suggested and verified. The highest tetracycline actual adsorption capacity obtained by ZIF-8 and ZIF-8-derived porous carbon were 171.3, and 339.06 mg/g, respectively. The study proposed the participation of hydrogen bonding and π–π interactions as main mechanism. With the high suitability, the response surface methodology can be an efficient optimization tool.
Published Version
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