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

Overview

Journal Molecules

Publisher MDPI

Specialty Biology

Date 2023 Apr 13

PMID 37049949

Authors

Zhenhua Wei

Chao Hou

Zhishuo Gao

Luolin Wang

Chuansheng Yang

Yudong Li

Kun Liu

Yongbin Sun

Affiliations

Soon will be listed here.

Abstract

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 (KHCO) as the activator. KHCO can endow biochar with abundant mesopores, but excessive KHCO cannot continuously promote the formation of mesoporous structures. In comparison with all of the prepared biochars, PKC-4 (biochar with a poplar leaf to KHCO 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.

Citing Articles

Solid shrimp waste derived nanoporous carbon as an alternative bio-sorbent for oxytetracycline removal from aquaculture wastewater.

Kaewtrakulchai N, Samattakarn N, Chanpee S, Assawasaengrat P, Manatura K, Wongrerkdee S Heliyon. 2024; 10(11):e32427.

PMID: 38933975 PMC: 11200350. DOI: 10.1016/j.heliyon.2024.e32427.

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