Research on adsorption mechanisms of levofloxacin over fungus chaff biochar modified by combination of alkali activation and copper-cobalt metallic oxides

Luo, Tingting; Wu, Lieshan; Jia, Bing; Zeng, Yalin; Hao, Jiajie; He, Shixing; Liang, Liuling

doi:10.1007/s13399-023-03803-y

Cited by 4 publications

(1 citation statement)

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“…Adsorbents are the key to adsorption technology [ 16 , 17 , 18 , 19 , 20 ]. In the past decades, researchers have developed a variety of adsorbents, including metal oxides [ 21 ], molecular sieves [ 22 ], MOFs [ 23 ], carbon nanotubes [ 24 ], MXenes [ 25 ], etc. Recently, biochar has been widely used to remove antibiotics from the environment due to its porous structure and low cost [ 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Biochar with Developed Mesoporous Structure from Poplar Leaf Activated by KHCO3 and Its Efficient Adsorption of Oxytetracycline Hydrochloride

et al. 2023

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The effective removal of oxytetracycline hydrochloride (OTC) from the water environment is of great importance. Adsorption as a simple, stable, and cost-effective technology is regarded as an important method for removing OTC. Herein, a low-cost biochar with a developed mesoporous structure was synthesized via pyrolysis of poplar leaf with potassium bicarbonate (KHCO3) as the activator. KHCO3 can endow biochar with abundant mesopores, but excessive KHCO3 cannot continuously promote the formation of mesoporous structures. In comparison with all of the prepared biochars, PKC-4 (biochar with a poplar leaf to KHCO3 mass ratio of 5:4) shows the highest adsorption performance for OTC as it has the largest surface area and richest mesoporous structure. The pseudo-second-order kinetic model and the Freundlich equilibrium model are more consistent with the experimental data, which implies that the adsorption process is multi-mechanism and multi-layered. In addition, the maximum adsorption capacities of biochar are slightly affected by pH changes, different metal ions, and different water matrices. Moreover, the biochar can be regenerated by pyrolysis, and its adsorption capacity only decreases by approximately 6% after four cycles. The adsorption of biochar for OTC is mainly controlled by pore filling, though electrostatic interactions, hydrogen bonding, and π-π interaction are also involved. This study realizes biomass waste recycling and highlights the potential of poplar leaf-based biochar for the adsorption of antibiotics.

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