Agricultural waste biochar after potassium hydroxide activation: Its adsorbent evaluation and potential mechanism

Jian Guan; Mingxin Zhu; Jun Zhou; Liwen Luo; Luiz Fernando Romanholo Ferreira; Xueying Zhang; Jiayang Liu

doi:10.1016/j.biortech.2023.129793

Agricultural waste biochar after potassium hydroxide activation: Its adsorbent evaluation and potential mechanism

Jian Guan, Mingxin Zhu, Jun Zhou, Liwen Luo, Luiz Fernando Romanholo Ferreira, Xueying Zhang, Jiayang Liu^*

^*Corresponding author for this work

Institute of Bioresource and Agriculture

Research output: Contribution to journal › Journal article › peer-review

3 Citations (Scopus)

Abstract

The agricultural waste (Goji branch) was pyrolyzed into biochars with one-step potassium hydroxide (KOH) activation under different processing conditions. The biochars were first characterized in structural features and functional groups and then evaluated for adsorptive performance with methylene blue as a model pollutant. Different adsorption models were applied to fit the adsorption process and reveal the possible mechanisms. The adsorption capacity was found to strongly correlate (R² = 0.9642) with the surface area of the biochars, among which biochar K_50%W_29%C-700 (pyrolysis at 700 °C in the presence of 50 % KOH and 29 % water) possessed the largest surface area (1378 m²/g) and exhibited the highest adsorption capacity (769 mg/g) compared to its homologous products. Biochar K_50%W_29%C-700 also showed excellent recyclability and potent adsorption capacity toward other common organic pollutants. The results suggest that traces of water in agricultural wastes could significantly intensify the KOH-involved activation efficiency of producing porous biochar.

Original language	English
Article number	129793
Number of pages	11
Journal	Bioresource Technology
Volume	389
DOIs	https://doi.org/10.1016/j.biortech.2023.129793
Publication status	Published - Dec 2023

Scopus Subject Areas

Bioengineering
Environmental Engineering
Renewable Energy, Sustainability and the Environment
Waste Management and Disposal

User-Defined Keywords

Adsorption
Goji branch
Hydroxide
Methylene blue
Pyrolysis

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.biortech.2023.129793

Cite this

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title = "Agricultural waste biochar after potassium hydroxide activation: Its adsorbent evaluation and potential mechanism",

abstract = "The agricultural waste (Goji branch) was pyrolyzed into biochars with one-step potassium hydroxide (KOH) activation under different processing conditions. The biochars were first characterized in structural features and functional groups and then evaluated for adsorptive performance with methylene blue as a model pollutant. Different adsorption models were applied to fit the adsorption process and reveal the possible mechanisms. The adsorption capacity was found to strongly correlate (R2 = 0.9642) with the surface area of the biochars, among which biochar K50%W29%C-700 (pyrolysis at 700 °C in the presence of 50 % KOH and 29 % water) possessed the largest surface area (1378 m2/g) and exhibited the highest adsorption capacity (769 mg/g) compared to its homologous products. Biochar K50%W29%C-700 also showed excellent recyclability and potent adsorption capacity toward other common organic pollutants. The results suggest that traces of water in agricultural wastes could significantly intensify the KOH-involved activation efficiency of producing porous biochar.",

keywords = "Adsorption, Goji branch, Hydroxide, Methylene blue, Pyrolysis",

author = "Jian Guan and Mingxin Zhu and Jun Zhou and Liwen Luo and {Fernando Romanholo Ferreira}, Luiz and Xueying Zhang and Jiayang Liu",

note = "Funding information: This work was supported by Nanqiao {\textquoteleft}Chunsun{\textquoteright} Talent Plan and {\textquoteleft}113{\textquoteright} Innovation Team Plan (Chuzhou, Anhui), the 2022 Carbon Dafeng and Carbon Neutral Science and Technology Innovation Special Fund in Jiangsu Province (BK20220003), and the Jiangsu Province Science and Technology Program Special Fund (Hong Kong, Macao, and Taiwan Science and Technology Cooperation) (BZ2022052). Publisher Copyright: {\textcopyright} 2023 Published by Elsevier Ltd.",

year = "2023",

month = dec,

doi = "10.1016/j.biortech.2023.129793",

language = "English",

volume = "389",

journal = "Bioresource Technology",

issn = "0960-8524",

publisher = "Elsevier Ltd.",

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TY - JOUR

T1 - Agricultural waste biochar after potassium hydroxide activation

T2 - Its adsorbent evaluation and potential mechanism

AU - Guan, Jian

AU - Zhu, Mingxin

AU - Zhou, Jun

AU - Luo, Liwen

AU - Fernando Romanholo Ferreira, Luiz

AU - Zhang, Xueying

AU - Liu, Jiayang

N1 - Funding information: This work was supported by Nanqiao ‘Chunsun’ Talent Plan and ‘113’ Innovation Team Plan (Chuzhou, Anhui), the 2022 Carbon Dafeng and Carbon Neutral Science and Technology Innovation Special Fund in Jiangsu Province (BK20220003), and the Jiangsu Province Science and Technology Program Special Fund (Hong Kong, Macao, and Taiwan Science and Technology Cooperation) (BZ2022052). Publisher Copyright: © 2023 Published by Elsevier Ltd.

PY - 2023/12

Y1 - 2023/12

N2 - The agricultural waste (Goji branch) was pyrolyzed into biochars with one-step potassium hydroxide (KOH) activation under different processing conditions. The biochars were first characterized in structural features and functional groups and then evaluated for adsorptive performance with methylene blue as a model pollutant. Different adsorption models were applied to fit the adsorption process and reveal the possible mechanisms. The adsorption capacity was found to strongly correlate (R2 = 0.9642) with the surface area of the biochars, among which biochar K50%W29%C-700 (pyrolysis at 700 °C in the presence of 50 % KOH and 29 % water) possessed the largest surface area (1378 m2/g) and exhibited the highest adsorption capacity (769 mg/g) compared to its homologous products. Biochar K50%W29%C-700 also showed excellent recyclability and potent adsorption capacity toward other common organic pollutants. The results suggest that traces of water in agricultural wastes could significantly intensify the KOH-involved activation efficiency of producing porous biochar.

AB - The agricultural waste (Goji branch) was pyrolyzed into biochars with one-step potassium hydroxide (KOH) activation under different processing conditions. The biochars were first characterized in structural features and functional groups and then evaluated for adsorptive performance with methylene blue as a model pollutant. Different adsorption models were applied to fit the adsorption process and reveal the possible mechanisms. The adsorption capacity was found to strongly correlate (R2 = 0.9642) with the surface area of the biochars, among which biochar K50%W29%C-700 (pyrolysis at 700 °C in the presence of 50 % KOH and 29 % water) possessed the largest surface area (1378 m2/g) and exhibited the highest adsorption capacity (769 mg/g) compared to its homologous products. Biochar K50%W29%C-700 also showed excellent recyclability and potent adsorption capacity toward other common organic pollutants. The results suggest that traces of water in agricultural wastes could significantly intensify the KOH-involved activation efficiency of producing porous biochar.

KW - Adsorption

KW - Goji branch

KW - Hydroxide

KW - Methylene blue

KW - Pyrolysis

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DO - 10.1016/j.biortech.2023.129793

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AN - SCOPUS:85172661106

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JO - Bioresource Technology

JF - Bioresource Technology

M1 - 129793

ER -

Agricultural waste biochar after potassium hydroxide activation: Its adsorbent evaluation and potential mechanism

Abstract

Scopus Subject Areas

User-Defined Keywords

UN SDGs

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