Assisting the carbonization of biowaste with potassium formate to fabricate oxygen-doped porous biochar sorbents for removing organic pollutant from aqueous solution. (September 2022)

• Record Type: Journal Article
• Authors: Zhang, Jiapeng; Gu, Fei; Zhou, Yun; Li, Zixiang; Cheng, Hu; Li, Wei; Ji, Rongting; Zhang, Longjiang; Bian, Yongrong; Han, Jiangang; Jiang, Xin; Song, Yang; Xue, Jianming
• Is Part Of: Bioresource technology. Volume 360(2022)
• Publication Date: 2022-09
• Subjects: Porous biochar -- Green activator -- Potassium formate -- Phthalates acid esters -- Wastewater treatment; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2022.127546
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: OPBs were synthesized by the assisted-pyrolysis of biowaste with potassium formate. O content (26%) and surface functional groups were abundant in OPBs. Pore structure with high specific surface area (1386 m 2 g −1 ) was formed in OPBs. OPBs showed enhanced sorption capacity for DEP (453 mg g −1 ). Pore filling, π-π stacking and H bonding dominated the DEP sorption by OPBs. Abstract: In contrast to the efforts dedicated to applying porous biochars in environmental remediation, the search for green synthesis methods, which are crucial for industrialized production, is often neglected. Herein, oxygen-doped porous biochars were prepared for the first time by the assisted carbonization of hydrochar with a novel noncorrosive activator, potassium formate, and these biochars displayed a porous structure with large amounts of micropores (surface area: 1242 ∼ 1386 m 2 g −1 ). Interestingly, the biochars contained an abundance of oxygen element (20 ∼ 26%), which formed many functional groups. Through sorption experiments, it was demonstrated that the oxygen-doped porous biochars were excellent sorbents for diethyl phthalate, and maximum sorption quantity reached 453 mg g −1 . Monolayer sorption by pore filling, hydrogen bonding, electrostatic interaction and π-π stacking was the potential mechanism. This finding indicated that potassium formate was promising as an activator to greenly convert biowaste into advanced biochars for removing organic pollutants from aqueous solutions.