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Hierarchically porous SiO2/C hollow microspheres: a highly efficient adsorbent for Congo Red removal
- Source :
- RSC Advances. 8:19852-19860
- Publication Year :
- 2018
- Publisher :
- Royal Society of Chemistry (RSC), 2018.
-
Abstract
- Hierarchically porous SiO2/C hollow microspheres (HPSCHMs) were synthesized by a hydrothermal and NaOH-etching combined route. The adsorption performance of the prepared HPSCHMs was investigated to remove Congo Red (CR) in aqueous solution. The results show that the synthesized composite possesses a hollow microspherical structure with hierarchical pores and a diameter of about 100–200 nm, and its surface area is up to 1154 m2 g−1. This material exhibits a remarkable adsorption performance for CR in solution, and its maximum adsorption amount for CR can reach up to 2512 mg g−1. It shows faster adsorption and much higher adsorption capacity than the commercial AC and γ-Al2O3 samples under the same conditions. The studies of the kinetics and thermodynamics indicate that the adsorption of CR on the PHSCHM sample obeys the pseudo-second order model well and belongs to physisorption. The adsorption activation energy is about 7.72 kJ mol−1. In view of the hierarchically meso–macroporous structure, large surface area and pore volume, the HPSCHM material could be a promising adsorbent for removal of pollutants, and it could also be used as a catalyst support.
- Subjects :
- Aqueous solution
Materials science
General Chemical Engineering
Catalyst support
02 engineering and technology
General Chemistry
Activation energy
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Hydrothermal circulation
0104 chemical sciences
Congo red
chemistry.chemical_compound
Adsorption
Physisorption
chemistry
Chemical engineering
0210 nano-technology
Porosity
Subjects
Details
- ISSN :
- 20462069
- Volume :
- 8
- Database :
- OpenAIRE
- Journal :
- RSC Advances
- Accession number :
- edsair.doi...........c380f336dbcc60fb479289d766e8563c