Journal
ACS OMEGA
Volume 3, Issue 7, Pages 7523-7531Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.8b00577
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Funding
- Opening program of State Key Laboratory of Solid Lubrication [LSL-1508]
- National Natural Science Foundation of China [51303086, 51503108, 51503107, 51605470]
- Foundation of Key Laboratory of Pulp and Paper Science and Technology of Ministry of Education/ Shandong Province of China [KF201602]
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A novel hydrogel bead [tannic acid (TA)-poly(vinyl alcohol) (PVA)/sodium alginate (SA)] with high strength prepared by biocompatible PVA, TA, and biocompatible SA via an instantaneous gelation method was applied to remove methylene blue (MB) from aqueous solution. The obtained TA-PVA/SA hydrogel beads were fully characterized by thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray photo-electron spectroscopy, scanning electron microscopy, and so on. The adsorption performances of TA-PVA/SA hydrogel beads for MB were investigated by changing the factors of TA content, initial concentration, pH, adsorbent dosage, contact time, and temperature systematically. The maximum capacity of TA-PVA/SA hydrogel beads for MB removal was obtained to be 147.06 mg/g at 30 degrees C, whose capability was better than that without TA. After fitting the adsorbed data, it was basically consistent with the Langmuir isotherm and pseudo-second-order kinetic model. Thermodynamic studies indicated that MB removal was spontaneous and exothermic in nature. It is concluded that the low-cost TA-PVA/SA hydrogel beads as an easily recoverable adsorbent have a great potential on the removal of hazardous dyes from wastewater.
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