Simultaneous adsorption of phosphate and tetracycline by calcium modified corn stover biochar: Performance and mechanism

•A calcium modified biochar was used to simultaneously adsorb phosphate and TC.•The phosphate adsorption relies on the chemical precipitation and ligand exchange.•Hydrogen bonding and π-π interactions are the main adsorption mechanism of TC. It is important to solve the problems of biomass treatment...

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Published inBioresource technology Vol. 359; p. 127477
Main Authors Zhuo, Sheng-Nan, Dai, Tian-Chi, Ren, Hong-Yu, Liu, Bing-Feng
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2022
Subjects
adsorbents
adsorption
biochar
Biochar adsorbent
Biomass
calcium
Carbon reduction
chemical precipitation
corn stover
hydrogen
ligands
oxygen
phosphates
raw materials
remediation
sorption isotherms
technology
tetracycline
wastewater
Wastewater treatment
Biomass
Biochar adsorbent
Carbon reduction
Wastewater treatment
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Summary:•A calcium modified biochar was used to simultaneously adsorb phosphate and TC.•The phosphate adsorption relies on the chemical precipitation and ligand exchange.•Hydrogen bonding and π-π interactions are the main adsorption mechanism of TC. It is important to solve the problems of biomass treatment and combined contaminants removal in environmental remediation. In this study, a calcium (Ca) modified biochar (CaBC800) was fabricated using corn stover (CS) as a raw material to remove phosphate and tetracycline (TC). The experimental results indicate that CaBC800 can adsorb both inorganic phosphate and organic TC. The entire adsorption process corresponds to pseudo-second-order kinetics and Langmuir adsorption isotherm. The maximum adsorption capacities of phosphate and TC were 33.944 and 33.534 mg/g, respectively. The phosphate adsorption was demonstrated to mainly depend on the chemical precipitation by Ca2+ and ligand exchange by hydroxyl groups from CaBC800. Meanwhile, hydrogen bonding from oxygen functional groups and π-π interactions from aromatic rings are the main adsorption mechanisms of TC. This study provides a new adsorbent to efficiently remove phosphate and TC, and the simultaneous adsorption indicates the application potential of CaBC800 in wastewater remediation.
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ISSN:0960-8524
1873-2976
1873-2976
DOI:10.1016/j.biortech.2022.127477