Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 411, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.125029
Keywords
Adsorption; ?-cyclodextrin; Hydrogels; Strength optimization
Categories
Funding
- Natural Science Foundation of Tianjin City [18JCQNJC03400]
- National Natural Science Foundation of China [51503145, 11702187]
- Natural Science Foundation of Fujian Province [2018J01504, 2018J01505]
- Program for Innovative Research Team in University of Tianjin [TD13-5043]
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This study improved the preparation method of hydrogels, enhancing their strength and adsorption capacity, making them have great potential for wastewater treatment.
Hydrogels have extensively studied as adsorbents, raw materials for the preparation of adsorbent hydrogels have low strength, while high strength hydrogels have weak adsorption capacity. In this study, PVA hydrogel was crosslinked via trihydroxy melamine and epichlorohydrin, and ?-cyclodextrin with strong adsorption capacity was added to remove the heavy metal ions. Results showed that the addition of trihydroxy melamine with 8%, the compressive strength of the hydrogel was increased by approximately 20%. The Langmuir isotherm model showed that the adsorption capacity of the hydrogel for Pb(II) and Ni(II) reached 505.9 mg/g and 286.7 mg/g, respectively, and the efficiency of removing the low-concentration heavy metal ions in water more than 99%. The hydrogel is low cost, and maintained highly removal efficiency under low pH. The removal efficiency of the hydrogel remained above 90% after five repeated adsorption-desorption experiments. The hydrogels have a potential to be used in wastewater treatment as adsorbents.
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