Document Type

Journal Article

Publication Title

Energies

Volume

15

Issue

21

Publisher

MDPI

School

School of Engineering

RAS ID

54077

Funders

Natural Science Foundation of Jiangsu Province (Grant No. BK20200794) / National Natural Science Foundation of China (Grant Nos. 52106249 and 51876093) / China MOST (Grant No. 2018YFE0183600) / Start-up Fund for Scientific Research of Nanjing Forestry University (Grant No. GXL2020002)

Comments

Gao, W., Lin, Z., Yan, S., Gao, Y., Zhang, H., Hu, X., ... & Zhang, S. (2022). Preparation of N-, O-, and S-tri-doped biochar through one-pot pyrolysis of poplar and urea formaldehyde and its enhanced removal of tetracycline from wastewater. Energies, 15(21), 8081. https://doi.org/10.3390/en15218081

Abstract

In this study, biochar was prepared via hybrid doping of N, O, and S by applying one-pot pyrolysis of poplar wood and S-containing urea formaldehyde at 900 °C. Different doping ratios were adopted, and the contents of O, N, and S were in the ranges of 2.78 – 5.56 %, 2.16 – 4.92 %, and 1.42 – 4.98 %, respectively. This hybrid doping significantly enhanced the efficiency of the removal of tetracycline (40 mg/L) from wastewater to 71.84 % in comparison with that attained by using normal poplar biochar (29.45 %). The adsorption kinetics and isotherms indicated that the adsorption process was favorable and was dominated by chemisorption instead of physisorption; the dominant adsorption process may be justified by the existence of abundant functional groups. The adsorption capacity was barely related to the surface area (R2 = 0.478), while it was closely related to the concentration of graphitic N (R2 = 0.985) because graphitic N enhanced the π–π interactions. The adsorption capacity was also highly related to the proportion of oxidized N and oxidized S owing to hydrogen bonding, which may have overlapped with the contribution of O-containing functional groups. This study presents a simple hybrid doping method for biochar modification and provides fundamental insights into the specific effects of O-, N- and S-containing functional groups on the performance of biochar for tetracycline removal.

DOI

10.3390/en15218081

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Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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