Abstract
Biodegradable oil absorbing materials have attracted extensive attention in dealing with oil spill pollution. To develop more excellent oleophilic oil sorbent, the combination of tannic acid and ferrous sulfate was employed to treat the renewable and biodegradable natural kapok fiber. The as-prepared kapok showed superhydrophobic characteristics with high water contact for the formation of tannic acid and ferrous ion complex on kapok surface, which was confirmed by scanning electron microscopy observation and infrared spectroscopy and X-ray diffraction analysis. The preparation process of the modified kapok fiber was optimized. When the sodium chlorite pretreated kapok fiber was firstly treated with 4.25 g/l tannic acid and subsequently immersed in 4.25 g/l tannic acid and 6.25 g/l ferrous sulfate mixture at 60 °C for 15 min, the asprepared kapok fiber presented the best oil absorption capacity and hydrophobicity (water contact angle 150.7 °). The treated kapok had good adsorption capacity for oils and organic solvents, 48.2, 41.6, 53.4, 52.8, 49.2, 41.2 g/g for vegetable oil, diesel oil, silicone oil, carbon tetrachloride, DMF and n-hexane, respectively. In addition, the tannic acid and ferrous sulfate treated kapok was recycled for six times through simple mechanical squeezing, and showed good oil-water separation performance oil, indicating its potential application in the removal of spilled oil on water.
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This research is financially supported by the Hubei Provincial Natural Science Foundation (No. ZRMS2020002231) and Educational Research Program of Wuhan Textile University.
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Ke, G., Chen, S., Tang, J. et al. Tannic Acid and Ferrous Sulfate Modified Kapok Fiber for Oil-water Separation. Fibers Polym 23, 3058–3067 (2022). https://doi.org/10.1007/s12221-022-0458-y
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DOI: https://doi.org/10.1007/s12221-022-0458-y