We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Adsorption properties for ammonia nitrogen by polyacrylic acid/sodium alginate-based titanium dioxide composite hydrogel.
- Authors
Chang-Zi Guo; Yi Han; Wan-Qin Zhao; Xu-Li Zhang
- Abstract
Polyacrylic acid/sodium alginate-based titanium dioxide (PAA/SA@TiO2) composite hydrogel has the good nitrogen removal properties in the nitrogen-containing wastewaters. Under the optimal adsorption conditions, which include pH 7, temperature 35°C, adsorbent dosage 6 g/L, adsorption equilibrium time 70 min, the adsorption efficiency is 85.56%, 79.46%, and 67.63% when the initial ammonia nitrogen concentrations of 100, 200, and 300 mg/L, respectively, indicating that the hydrogel has good adsorption performance for ammonia nitrogen. The adsorption process conforms to the monolayer adsorption of the Langmuir model, and the adsorption kinetic process belongs to the pseudo-second-order kinetic model of chemical adsorption. The structure of PAA/SA@TiO2 composite hydrogel is stable. The thermogravimetric analysis revealed that its main chain of the composite hydrogel began to break and degrade only at 446°C with thermally decomposed hydroxyl and carboxyl groups. At 800°C, the thermal loss rate was 48%. After 5 cycles of adsorption regeneration, the adsorption efficiency only drops by about 10%. The research results showed that PAA/ SA@TiO2 composite hydrogel had great application prospects in the field of nitrogen-containing wastewater treatment, which provided the theoretical basis and operating parameters for the hydrogel applying in the nitrogen-containing wastewaters treatment.
- Subjects
POLYACRYLIC acid; TITANIUM composites; TITANIUM dioxide; LANGMUIR isotherms; HYDROGELS; CHEMICAL models
- Publication
Desalination & Water Treatment, 2023, Vol 316, p383
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2023.30208