Back to Search
Start Over
Preparation of composite graphene hydrogels adsorbent with special-shaped ZnO and TiO2
- Source :
- Colloids and Surfaces A: Physicochemical and Engineering Aspects. 581:123783
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Graphene-based hydrogels (GH) have exhibited prominent performances in wastewater treatment. Herein, Special-shaped ZnO tetrapods and TiO2 nanosheets were introduced to the preparation of GH via a one-step hydrothermal reduction method. The ZnO-GH and TiO2-GH composite hydrogel with a uniform 3D network structure and good mechanical properties can be used as an adsorbent for printing and dyeing wastewater. The optimum doping amount of ZnO and TiO2 in the composite hydrogel and the adsorption regularity to rhodamine B (RhB) with different concentrations were discussed. The cyclic adsorption performance and adsorption kinetics were briefly discussed. When the doping ratio of ZnO to graphene oxide (GO) is 5:8, ZnO-GH has the best adsorption rate, which is 71.7%. The best degradation rate appears at a ZnO doping ratio of 1:2, which also shows the best total removal rate of RhB of approximately 82.20%. When the doping ratio of TiO2 to GO is 3:4, the photocatalytic degradation rate is 30.3%, and the total removal rate of RhB reaches 99.1%, which indicates that RhB can be almost completely removed by TiO2-GH through adsorption and degradation. After five cycles, the adsorption capacity of ZnO-GH and TiO2-GH for the low RhB concentration is still good. The addition of ZnO and TiO2 improves not only the adsorption and degradation properties of the composite hydrogel but also its recycling performance as a result of the increase in mechanical stability.
- Subjects :
- Materials science
Graphene
Doping
Composite number
Oxide
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
law.invention
chemistry.chemical_compound
Colloid and Surface Chemistry
Adsorption
chemistry
Chemical engineering
law
Self-healing hydrogels
Rhodamine B
Degradation (geology)
0210 nano-technology
Subjects
Details
- ISSN :
- 09277757
- Volume :
- 581
- Database :
- OpenAIRE
- Journal :
- Colloids and Surfaces A: Physicochemical and Engineering Aspects
- Accession number :
- edsair.doi...........0afce610b3b38ed1107864f8960ba940
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2019.123783