期刊
CHEMISTRYSELECT
卷 7, 期 36, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.202202975
关键词
Acidification; Adsorption; Methylene blue; Sodium alginate; Adsorption Mechanism
资金
- National Natural Science Foundation of China [51672140]
- Taishan Scholar Program of Shandong Province [201511029]
In this study, acid-modified sodium alginate (AMSA) was synthesized using a simple acidification method and its synthesis was confirmed. AMSA showed a high adsorption capacity for methylene blue (MB) in water and a fast adsorption rate. Electrostatic interaction and hydrogen bonding, pore-filling and chemisorption were considered as the main adsorption mechanisms.
The acid-modified sodium alginate (AMSA) was synthesized utilizing a simple acidification method and its synthesis was confirmed by acid-base titration method, SEM, XRD, FTIR, TGA and BET. The sodium alginate after acidification, with a large number of carboxyl groups introduced, was favorable to the adsorption of methylene blue (MB) from water. The maximum adsorption capacity calculated by Langmuir model was up to 1593 mg/g, which was significantly higher than the adsorption capacity of other adsorbents reported. The adsorption rate of MB by AMSA was very fast. After the addition of adsorbent, the adsorption removal rate reached 79 % in 30 min, and the adsorption was balanced in 120 min (94 % of MB was removed). Furthermore, electrostatic interaction and hydrogen bonding, pore-filling and chemisorption were considered as the main adsorption mechanisms. AMSA is expected to be an optimal candidate for efficient and rapid removal of MB due to its simple synthesis, abundant sources, easy separation and no secondary pollution.
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