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- Title
Efficient simultaneous removal of anionic phosphate and cationic ammonium using amphoteric cellulose/laponite nanocomposite hydrogel.
- Authors
Yin Wang; Ruotong Wang; Lan Yu; Yun Wang; Xiaodong Zhang
- Abstract
Amphoteric cellulose/laponite nanocomposite hydrogel (AC/Lap-Hy) was successfully synthesized by using dodecyl dimethyl betaine (BS-12) as a zwitterionic modifier and Laponite as a physical crosslinker and applied simultaneously to remove cationic ammonium and anionic phosphate from water. The characteristics of AC/Lap-Hy indicated that the required binding sites were successfully grafted onto the hydrogel and the porous structure was formed. Batch adsorption experiment showed that the maximum adsorption capacity for phosphate and ammonium was at pH 6.0 and 8.0, respectively. The adsorption isotherm and kinetic could be well described by Langmuir and the pseudo-second-order model. Furthermore, the adsorption of phosphate was endothermic, while exothermic for ammonium. AC/Lap-Hy could be regenerated effectively and recycled. Moreover, the adsorption mechanism was possible dominated by chemisorption. These superior properties of AC/Lap-Hy demonstrated it as a promising adsorbent in the simultaneous treatment of wastewaters containing both ammonium and phosphate.
- Subjects
AMMONIUM phosphates; CELLULOSE; ADSORPTION isotherms; PHOSPHATES; ADSORPTION capacity; AMMONIUM; CHEMISORPTION; BINDING sites
- Publication
Desalination & Water Treatment, 2020, Vol 196, p146
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.25927