Journal
CHEMICAL ENGINEERING JOURNAL
Volume 411, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128502
Keywords
Adsorption; Graphene-like biochar; Ball-milling; TEMPO-mediated oxidation; Hydrophilic organic pollutants
Categories
Funding
- National Key R&D Program of China [2018YFC1802001]
- special fund of platform for innovation of Tianjin Science and Technology Commission [19PTZWHZ00040]
- Science and Technology Major Project of Tianjin [19ZXSZSN00010]
- Postdoctoral Science Foundation of China [2019M651018]
- Major Research plan of the Shandong Science Foundation [ZR202010200053]
- Ministry of Education of China [T2017002]
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Graphite-like biochars were prepared by pyrolyzing modified newspaper and maize straw, showing great graphitization and specific surface areas. The biochars adsorbed IMI and SUL mainly through pore-filling, H-bonding, and electrostatic interactions. The combination of ball-milling and oxidation modification method provided efficient adsorbents for removing hydrophilic pesticides and antibiotics from polluted water.
In this study, graphite-like biochars were successively prepared by pyrolyzing modified newspaper and maize straw with ball-milling and 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)mediated oxidation at a pyrolysis temperature of 900 degrees C and their physico-chemical properties and adsorption performances towards imidacloprid (IMI) and sulfadiazine (SUL) in aqueous solution were all explored. The results showed that the successive modification by ball-milling and TEMPO-mediated oxidation completely open the fibers of the newspaper and porous stereoscopic structures of the maize straw. The obtained graphite-like biochars contained planar structures and abundant O-containing functional groups, and exhibited a great degree of graphitization and specific surface areas reaching up to 871.5 and 1065 m(2)/g, making them super adsorbents. Furthermore, hydrophobic partitioning provided a limited contribution to the sorption on biochars for IMI and SUL as revealed by dual mode model fitting. The graphite-like biochars adsorbed IMI and SUL, mainly through pore-filling, H-bonding, cation/p/pi-pi EDA interactions, and electrostatic interactions and cation-pi EDA interactions further enhanced the sorption of cationic IMI. Additionally, the adsorption efficiency of biochars pretreated with ball-milling and TEMPO-mediated oxidation for IMI and SUL was>85%, even after five consecutive recycling process. Thus, this study provides excellent graphite-like biochar adsorbents pretreated with a combined ball-milling and oxidation modification method, making them efficient for removing hydrophilic pesticides and antibiotics from polluted water.
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