Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 254, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.117620
Keywords
Hydrophobicity; Porous diatomite ceramic; pH-sensitive; ISOBAM-104; Oil/water separation; Fluorine-free
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Funding
- National Natural Science Foundation of China [518722210, 51672194]
- Program for Innovative Teams of Outstanding Young and Middle-aged Researchers in the Higher Education Institutions of Hubei Province, China [T201602]
- Key Program of Natural Science Foundation of Hubei Province, China [2017CFA004]
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The study successfully synthesized a fluorine-free and pH-sensitive hydrophobic porous diatomite ceramics, which exhibited different hydrophilic or hydrophobic behaviors under different acid-base conditions. Their adsorption capacity for oil/water separation was significantly higher than that of traditional inorganic sorbents.
The development of sorbents with hydrophobicity or hydrophilicity is key in tackling increasingly serious oil spill/leakage problems. In this work, fluorine-free and pH-sensitive hydrophobic porous diatomite ceramics modified by isobutylene-maleic anhydride copolymer were successfully synthesized for the first time, via a simple but novel impregnation and heat-treatment method. Upon the removal of hydroxyl groups via 1 h heating at 573 K in a 5% H-2/Ar atmosphere, the amide groups in the original isobutylene-maleic anhydride copolymer were transformed to imide groups, conferring excellent hydrophobicity and oil/water separation capacity on the final porous ceramics. As-prepared hydrophobic porous diatomite ceramics were pH-sensitive and exhibited hydrophobic behavior in strong acid (pH = 1) whereas hydrophilic behavior in strong alkali (pH = 13). Their adsorption capacity for oil/water separation was 1.7-60 times as high as that of their conventional inorganic sorbent counterparts.
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